# CPU hogging to 100%
**URL:** https://discourse.nodered.org/t/cpu-hogging-to-100/2944
**Category:** General
**Created:** [7 September 2018 12:15 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944 "2018-09-07T12:15:59Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [7 September 2018 12:15 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/1 "2018-09-07T12:15:59Z")
I sometimes have NodeRed hog one of the cores to 100 % .
It effectively blocks NodeRed entirely and I cannot access the dashboard anymore. There is nothing in the logs and the only way to get things working again is to kill and restart node-red.
What is the best way to debug this.
---
### Author:  [@janvda](https://discourse.nodered.org/u/janvda)
#### Post date: [7 September 2018 12:27 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/2 "2018-09-07T12:27:11Z")
I have not yet experienced this kind of problem so I am not the best source to help you.
Maybe using the unix [strace](https://en.wikipedia.org/wiki/Strace) command can give you already a clue of the root cause of your problem.
So you need to find the PID of your node-red process (which is 5470 in your screenshot above)
and then run a command like (replace 5470 with actual PID of your node-RED process):
> sudo strace -p 5470
---
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [7 September 2018 12:33 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/3 "2018-09-07T12:33:19Z")
π thanks, will try
---
### Author:  [@ncherry](https://discourse.nodered.org/u/ncherry)
#### Post date: [7 September 2018 13:16 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/4 "2018-09-07T13:16:06Z")
I've seen this when output from a node (like an on/off flow) feeds back into itself. It ends up with a feedback loop that you can't recover from. I see this with things like the dashboard\_ui switch or pub/sub to mqtt topics.
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [7 September 2018 13:38 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/5 "2018-09-07T13:38:57Z")
I would expect this is a badly-behaving contrib node. Are there any logged errors? You could try upping the loging level. Are you using the exec node to call an external script anywhere? Though that should show up in the list under its own name.
Can you correlate when it happens with something that your flows are executing?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [7 September 2018 13:50 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/6 "2018-09-07T13:50:16Z")
For me too the usual cause of this is an mqtt loop. If you are using mqtt then stop the mqtt server and see if it recovers, if it does then that is the problem.
---
### Author:  [@krambriw](https://discourse.nodered.org/u/krambriw)
#### Post date: [7 September 2018 13:58 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/7 "2018-09-07T13:58:48Z")
> [@Colin](#):
>
> For me too the usual cause of this is an mqtt loop
Yes, it can easily happen that such a mqtt loop is "created" by accident. Especially if you have many flow tabs, using links etc etc
The following example is such a one, Node-RED gets so busy, nothing is logged in the debug log and the editor is not responding anymore. Don't try it on a mission critical system since you have to stop/start node-red to recover
---
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [22 September 2018 15:34 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/9 "2018-09-22T15:34:58Z")
Thanks for all the replies.
Sorry for my late reply back, it didnt happen in a while. But it just did again.
It is not MQTT related as far as I can tell. I stopped the server and that didnt change anything, CPU remained high.
But I am also experiencing some issues with my tradfri gateway ( tradfri = garbage, dont buy) lately and I suspect that the problem is there somewhere.
---
### Author:  [@janvda](https://discourse.nodered.org/u/janvda)
#### Post date: [23 September 2018 09:39 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/10 "2018-09-23T09:39:41Z")
Did βstraceβ command provide some valuable input?
---
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [23 September 2018 09:49 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/11 "2018-09-23T09:49:16Z")
Thanks yes! It did provide output. a \*lot \* of output π
Went through it but couldn't really make heads or tails from it unfortunately.
---
### Author:  [@janvda](https://discourse.nodered.org/u/janvda)
#### Post date: [24 September 2018 13:52 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/12 "2018-09-24T13:52:20Z")
You can of course post the output in this thread and maybe someone else is able to make sense. So far not much info is shared to help you with root cause analysis.
---
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [25 September 2018 06:22 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/13 "2018-09-25T06:22:43Z")
Yes maybe I will put the output here. Will be a lot if info though. At least 5 to 600 lines. Maybe double... π
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [25 September 2018 06:30 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/14 "2018-09-25T06:30:03Z")
Use the plus \<-- on the left to add a snippet
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [25 September 2018 15:20 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/15 "2018-09-25T15:20:37Z")
> [@dceejay](#):
>
> Use the plus \<-- on the left to add a snippet
Urm, isn't that on Slack? π
---
### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [25 September 2018 16:59 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/16 "2018-09-25T16:59:21Z")
yes - too many channels... too busy a week...
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [25 September 2018 18:48 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/17 "2018-09-25T18:48:19Z")
> [@dceejay](#):
>
> too many channels... too busy a week...
I feel your pain indeed. Story of most of our lives I expect.
---
### Author:  [@janvda](https://discourse.nodered.org/u/janvda)
#### Post date: [25 September 2018 20:13 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/18 "2018-09-25T20:13:54Z")
> [@realjax](#):
>
> Yes maybe I will put the output here. Will be a lot if info though. At least 5 to 600 lines. Maybe double... π
Note that you can upload a file (also a text file) when adding a comment using the button below !
So you can upload the complete strace output as a text file in a comment.
Take care that this makes only sense for troubleshooting when you are still having the CPU 100% problem !
.
---
### Author:  [@Xeegi](https://discourse.nodered.org/u/Xeegi)
#### Post date: [3 December 2018 09:04 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/19 "2018-12-03T09:04:05Z")
Any updates on this one?
I have same issue. I've got NR running on RaspberryPi 3 with DietPi distro.
NR was installed with DietPi installer interface. Dashboard UI installed through NR's UI package manager. MQTT server is running on the same machine.
Some time after installing the Dashboard UI one CPU gets hogged up 100%.
While UI nodes are not used in the project, the issue persists.
I added my strace output below. Strace stopped giving output just when CPU hogging started. Got NR to hang faster by refreshing node-red-dashboard-ui page multiple times.
> **strace output**
>
> ```auto
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 1466, NULL, 8) = 1
> read(24, "GET /ui/css/app.min.less HTTP/1."..., 65536) = 499
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1448, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1446, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(24, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 242) = 242
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 1445, NULL, 8) = 1
> read(24, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 404
> write(24, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 332) = 332
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 1368, NULL, 8) = 1
> read(24, "GET /ui/icon192x192.png HTTP/1.1"..., 65536) = 454
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=21, u64=131274472811397141}}, {EPOLLIN, {u32=22, u64=131274472811397142}}, {EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1362, NULL, 8) = 3
> accept4(21, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK) = 27
> accept4(21, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK) = -1 EAGAIN (Resource temporarily unavailable)
> read(22, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 429
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_ctl(3, EPOLL_CTL_ADD, 27, {EPOLLIN, {u32=27, u64=131274472811397147}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}, {EPOLLIN, {u32=27, u64=131274472811397147}}], 1024, 1357, NULL, 8) = 2
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> writev(22, [{iov_base="HTTP/1.1 200 OK\r\nContent-Type: t"..., iov_len=253}, {iov_base="\37\213\10\0\0\0\0\0\0\3\355UKo\3338\20\376+\6{\225\f;\262\35\333\307\272\233\335\2"..., iov_len=826}], 2) = 1079
> read(27, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 605
> write(27, "HTTP/1.1 101 Switching Protocols"..., 175) = 175
> setsockopt(27, SOL_TCP, TCP_NODELAY, [1], 4) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 27, {EPOLLIN, {u32=27, u64=131274472811397147}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1352, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1351, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> writev(24, [{iov_base="HTTP/1.1 200 OK\r\nX-Powered-By: E"..., iov_len=279}, {iov_base="\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\300\0\0\0\300\10\6\0\0\0R\334l"..., iov_len=5697}], 2) = 5976
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1349, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> epoll_pwait(3, [{EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 1349, NULL, 8) = 1
> read(24, "POST /ui/socket.io/?EIO=3&transp"..., 65536) = 545
> write(24, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 277) = 277
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 1321, NULL, 8) = 1
> read(22, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 431
> epoll_pwait(3, [{EPOLLIN, {u32=27, u64=131274472811397147}}], 1024, 1320, NULL, 8) = 1
> read(27, "\301\210\316[\320\16\374q\370\304\201\21\325\16", 65536) = 14
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1298, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1298, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 1297, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(27, "\201\0063probe", 8) = 8
> epoll_ctl(3, EPOLL_CTL_MOD, 27, {EPOLLIN, {u32=27, u64=131274472811397147}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 100, NULL, 8) = 1
> read(24, "POST /ui/socket.io/?EIO=3&transp"..., 65536) = 549
> write(24, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 277) = 277
> write(22, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 251) = 251
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 49, NULL, 8) = 1
> read(26, "GET /ui/icon64x64.png HTTP/1.1\r\n"..., 65536) = 494
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=27, u64=131274472811397147}}, {EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 47, NULL, 8) = 2
> read(27, "\301\203\216\v\33\352\274\16\33", 65536) = 9
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 45, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 43, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> epoll_pwait(3, [], 1024, 42, NULL, 8) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 1240, NULL, 8) = 1
> read(26, "GET /ui/ HTTP/1.1\r\nHost: 192.168"..., 65536) = 580
> mprotect(0x4f600000, 524288, PROT_READ|PROT_WRITE) = 0
> mprotect(0x2a280000, 524288, PROT_READ|PROT_WRITE) = 0
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> getpid() = 5217
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 730, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 729, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=27, u64=131274472811397147}}], 1024, 727, NULL, 8) = 1
> read(27, "\210\202\244d\236\310\247\215", 65536) = 8
> write(27, "\210\2\3\351", 4) = 4
> shutdown(27, SHUT_WR) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 27, {EPOLLIN, {u32=27, u64=131274472811397147}}) = 0
> epoll_pwait(3, [{EPOLLIN|EPOLLERR|EPOLLHUP, {u32=27, u64=131274472811397147}}], 1024, 720, NULL, 8) = 1
> read(27, "", 65536) = 0
> epoll_ctl(3, EPOLL_CTL_DEL, 27, 0x7eaf2c48) = 0
> close(27) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 719, NULL, 8) = 1
> read(26, "GET /ui/css/app.min.css HTTP/1.1"..., 65536) = 477
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}, {EPOLLIN, {u32=8, u64=131274472811397128}}, {EPOLLIN, {u32=24, u64=131274472811397144}}], 1024, 709, NULL, 8) = 3
> read(22, "GET /ui/icon120x120.png HTTP/1.1"..., 65536) = 496
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(24, "GET /ui/socket.io/socket.io.js H"..., 65536) = 406
> write(24, "HTTP/1.1 304 Not Modified\r\nDate:"..., 90) = 90
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 705, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 243) = 243
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 702, NULL, 8) = 1
> read(22, "GET /ui/js/app.min.js HTTP/1.1\r\n"..., 65536) = 461
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}, {EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 677, NULL, 8) = 2
> read(26, "GET /ui/i18n.js HTTP/1.1\r\nHost: "..., 65536) = 452
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 673, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 244) = 244
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 671, NULL, 8) = 1
> read(26, "GET /ui/css/app.min.less HTTP/1."..., 65536) = 499
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 653, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 651, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 242) = 242
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 650, NULL, 8) = 1
> read(26, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 404
> write(26, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 332) = 332
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 573, NULL, 8) = 1
> read(26, "GET /ui/icon192x192.png HTTP/1.1"..., 65536) = 454
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}, {EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 568, NULL, 8) = 2
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(22, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 429
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}, {EPOLLIN, {u32=21, u64=131274472811397141}}], 1024, 563, NULL, 8) = 2
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> accept4(21, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK) = 28
> accept4(21, NULL, NULL, SOCK_CLOEXEC|SOCK_NONBLOCK) = -1 EAGAIN (Resource temporarily unavailable)
> epoll_ctl(3, EPOLL_CTL_ADD, 28, {EPOLLIN, {u32=28, u64=131274472811397148}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}, {EPOLLIN, {u32=28, u64=131274472811397148}}], 1024, 559, NULL, 8) = 2
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> writev(22, [{iov_base="HTTP/1.1 200 OK\r\nContent-Type: t"..., iov_len=253}, {iov_base="\37\213\10\0\0\0\0\0\0\3\355UKo\3338\20\376+\6{\225\f;\262\35\333\307\272\233\335\2"..., iov_len=826}], 2) = 1079
> read(28, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 605
> write(28, "HTTP/1.1 101 Switching Protocols"..., 175) = 175
> setsockopt(28, SOL_TCP, TCP_NODELAY, [1], 4) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 28, {EPOLLIN, {u32=28, u64=131274472811397148}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 552, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> writev(26, [{iov_base="HTTP/1.1 200 OK\r\nX-Powered-By: E"..., iov_len=279}, {iov_base="\211PNG\r\n\32\n\0\0\0\rIHDR\0\0\0\300\0\0\0\300\10\6\0\0\0R\334l"..., iov_len=5697}], 2) = 5976
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 550, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> epoll_pwait(3, [{EPOLLIN, {u32=28, u64=131274472811397148}}], 1024, 550, NULL, 8) = 1
> read(28, "\301\210\0253\275\"'\31\225\350Zy\270\"", 65536) = 14
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 543, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 543, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 542, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(28, "\201\0063probe", 8) = 8
> epoll_ctl(3, EPOLL_CTL_MOD, 28, {EPOLLIN, {u32=28, u64=131274472811397148}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 100, NULL, 8) = 1
> read(26, "POST /ui/socket.io/?EIO=3&transp"..., 65536) = 545
> write(26, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 277) = 277
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 78, NULL, 8) = 1
> read(22, "GET /ui/socket.io/?EIO=3&transpo"..., 65536) = 431
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 77, NULL, 8) = 1
> read(26, "GET /ui/icon64x64.png HTTP/1.1\r\n"..., 65536) = 494
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 54, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 53, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [], 1024, 52, NULL, 8) = 0
> write(22, "HTTP/1.1 200 OK\r\nContent-Type: t"..., 230) = 230
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=28, u64=131274472811397148}}], 1024, 99, NULL, 8) = 1
> read(28, "\301\203.X\304\376\34]\304", 65536) = 9
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 96, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 95, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 95, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> epoll_pwait(3, [{EPOLLIN, {u32=28, u64=131274472811397148}}], 1024, 94, NULL, 8) = 1
> read(28, "\301\227U\16\372\rg?p[\177\303. \37#2D\371\332\327#\34\"\263X\337\v\372", 65536) = 29
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 94, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 93, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 93, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(28, "\201\02442[\"ui-replay-done\"]", 22) = 22
> epoll_ctl(3, EPOLL_CTL_MOD, 28, {EPOLLIN, {u32=28, u64=131274472811397148}}) = 0
> epoll_pwait(3, [], 1024, 49, NULL, 8) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 383, NULL, 8) = 1
> read(22, "GET /ui/ HTTP/1.1\r\nHost: 192.168"..., 65536) = 580
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 139, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 138, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=28, u64=131274472811397148}}], 1024, 137, NULL, 8) = 1
> read(28, "\210\202\31N^y\32\247", 65536) = 8
> write(28, "\210\2\3\351", 4) = 4
> shutdown(28, SHUT_WR) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 28, {EPOLLIN, {u32=28, u64=131274472811397148}}) = 0
> epoll_pwait(3, [{EPOLLIN|EPOLLERR|EPOLLHUP, {u32=28, u64=131274472811397148}}], 1024, 108, NULL, 8) = 1
> read(28, "", 65536) = 0
> epoll_ctl(3, EPOLL_CTL_DEL, 28, 0x7eaf2c48) = 0
> close(28) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 107, NULL, 8) = 1
> read(22, "GET /ui/css/app.min.css HTTP/1.1"..., 65536) = 477
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}, {EPOLLIN, {u32=24, u64=131274472811397144}}, {EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 99, NULL, 8) = 3
> read(26, "GET /ui/icon120x120.png HTTP/1.1"..., 65536) = 496
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(24, "GET /ui/socket.io/socket.io.js H"..., 65536) = 406
> write(24, "HTTP/1.1 304 Not Modified\r\nDate:"..., 90) = 90
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_ctl(3, EPOLL_CTL_MOD, 24, {EPOLLIN, {u32=24, u64=131274472811397144}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 94, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 243) = 243
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=26, u64=131274472811397146}}], 1024, 92, NULL, 8) = 1
> read(26, "GET /ui/js/app.min.js HTTP/1.1\r\n"..., 65536) = 461
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}, {EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 61, NULL, 8) = 2
> read(22, "GET /ui/i18n.js HTTP/1.1\r\nHost: "..., 65536) = 452
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 57, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(26, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 244) = 244
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 241) = 241
> epoll_ctl(3, EPOLL_CTL_MOD, 26, {EPOLLIN, {u32=26, u64=131274472811397146}}) = 0
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [{EPOLLIN, {u32=22, u64=131274472811397142}}], 1024, 55, NULL, 8) = 1
> read(22, "GET /ui/css/app.min.less HTTP/1."..., 65536) = 499
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 38, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> futex(0x1bad62c, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1bad628, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1bad60c, FUTEX_WAKE_PRIVATE, 1) = 1
> epoll_pwait(3, [{EPOLLIN, {u32=8, u64=131274472811397128}}], 1024, 36, NULL, 8) = 1
> read(8, "\1\0\0\0\0\0\0\0", 1024) = 8
> write(22, "HTTP/1.1 304 Not Modified\r\nX-Pow"..., 242) = 242
> epoll_ctl(3, EPOLL_CTL_MOD, 22, {EPOLLIN, {u32=22, u64=131274472811397142}}) = 0
> epoll_pwait(3, [], 1024, 35, NULL, 8) = 0
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> cacheflush(0x71c688e0, 0x71c68abd, 0, 0x71c688a1, 0x1d0f6f0) = 0
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> cacheflush(0x71c68b00, 0x71c68b97, 0, 0x71c68ac1, 0x1d0f6ec) = 0
> cacheflush(0x71c68be0, 0x71c69408, 0, 0x71c68ba1, 0x1d0f7e8) = 0
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> futex(0x1ccb5ac, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x1ccb5a8, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
> futex(0x1ccb590, FUTEX_WAKE_PRIVATE, 1) = 1
> cacheflush(0x71c69460, 0x71c6955f, 0, 0x71c69421, 0x1d0f6ec) = 0
> cacheflush(0x71c695a0, 0x71c6b03c, 0, 0x71c69561, 0x1d0f6f0) = 0
>
> ```
---
### Author:  [@realjax](https://discourse.nodered.org/u/realjax)
#### Post date: [3 December 2018 14:48 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/20 "2018-12-03T14:48:22Z")
Hi,
> [@realjax](#):
>
> But I am also experiencing some issues with my tradfri gateway ( tradfri = garbage, dont buy) lately and I suspect that the problem is there somewhere.
All though I could not find any related info in the error output, I eventually removed the tradfri related nodes to see if they were indeed the problem. And I have had not had the issue ever since. I do have a problem with the entire setup freezing once in a while but I suspect that has more to do with the hardware it runs on then with Node Red. It runs on an Orange Pi Zero.
---
### Author:  [@janvda](https://discourse.nodered.org/u/janvda)
#### Post date: [3 December 2018 21:06 UTC](https://discourse.nodered.org/t/cpu-hogging-to-100/2944/21 "2018-12-03T21:06:46Z")
Thanks for sharing the strace. As strace logging stopped when CPU hogging started, this indicated that no system calls were made when the CPU 100% problem appeared - in other words the CPU is spending the 100% in user code (no system calls). So there is something wrong with the user code. I think this problem is due to the specific flows you are running (and not really due to Raspberry PI3 or DietPi) - maybe you are using a specific node that is causing this problem.
Maybe you can instrument you node.js application using [https://github.com/RuntimeTools/appmetrics](https://github.com/RuntimeTools/appmetrics) .
For your specific problem I would then enable profiling ([https://github.com/RuntimeTools/appmetrics#appmetricsconfigureoptions](https://github.com/RuntimeTools/appmetrics#appmetricsconfigureoptions) )
I admit I have myself not yet used this tool .... but I have also not yet encountered a CPU problem like you have.
[Next page](https://discourse.nodered.org/t/cpu-hogging-to-100/2944.md?page=2)