Fabre

#987704 webextensions 100% cpu stalling #987704

Package:: firefox

Source:: firefox

Description:: Mozilla Firefox web browser

Submitter:: Uwe Kleine-KÃ¶nig

Date:: 2022-06-30 17:36:04 UTC

Severity:: important

Tags:

#987704#5

Date:: 2021-04-28 07:00:47 UTC

From:

To:

Hello,

occationally (I didn't find the trigger yet) a subprocess of firefox
occupies one complete cpu. There is no functional problem, all seems to
work just fine.

It was not clear to me what part of firefox is responsible for it, but
now I think it is foxyproxy. I started a new profile and the problem
didn't occur until I enabled foxyproxy. Today I looked in more detail
into the process' status before closing firefox (which cures the
problem):

According to strace the process (with pid 16443) does:

        read(8, "\372", 1)                      = 1
        recvmsg(17, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
        recvmsg(17, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
        poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
        write(9, "\372", 1)                     = 1
        recvmsg(17, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
        recvmsg(17, {msg_namelen=0}, 0)         = -1 EAGAIN (Resource temporarily unavailable)
        poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])

in a tight loop.

ls /proc/16443 contains:
lrwxrwxrwx   1 uwe  uwe  0 Apr 28 08:25 cwd -> '/proc/16444/fdinfo (deleted)'
lrwxrwxrwx   1 uwe  uwe  0 Apr 28 08:25 root -> '/proc/16444/fdinfo (deleted)'

and after I killed the process, normal web surfing is unaffected, and
foxyproxy doesn't work any more. (That is, the icon still appears in the
address bar and I can reconfigure foxyproxy, but when I access a site
that requires to pick a non-default proxy setting, firefox tries to
access it directly.)

I clicked a bit around in the developer console, looking for service
workers, but didn't find anything.
In the console there are a few messages:

	Promise resolved after context unloaded
	background.js:53
	Object { mode: "patterns", proxySettings: (2) […] }
	 activeSettings in patterns mode background.js:176:13
	background.js: loaded proxy settings from storage. background.js:105:11
	Promise resolved after context unloaded
	vapi-background.js:1456
	The Components object is deprecated. It will soon be removed. regex.js:12:20

I have no idea how to further debug that.

Best regards
Uwe

#987704#10

Date:: 2021-04-28 07:53:58 UTC

From:

To:

Hi Uwe,

thanks for your report.

me neither :)

I'll open a issue in the upstream repo on github..

Regards,
Daniel

#987704#15

Date:: 2021-05-21 07:35:46 UTC

From:

To:

I checked now what that WebExtensions process does directly after
starting, there it looks like following:

09:26:10.657028 restart_syscall(<... resuming interrupted read ...>) = 1
09:26:11.155145 read(8, "\372", 1)      = 1
09:26:11.155647 futex(0x7ff2ccf2aeb4, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.156104 write(9, "\372", 1)     = 1
09:26:11.156379 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.156848 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.157099 read(8, "\372", 1)      = 1
09:26:11.157342 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.157457 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.157786 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.157940 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.158081 write(15, "\0", 1)      = 1
09:26:11.158385 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.158535 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.158652 read(8, "\372", 1)      = 1
09:26:11.158754 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.158852 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.158974 write(9, "\372", 1)     = 1
09:26:11.159077 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.159174 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.159284 read(8, "\372", 1)      = 1
09:26:11.159395 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.159496 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.159964 futex(0x7ff2ddd32404, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.160060 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.160201 write(15, "\0", 1)      = 1
09:26:11.160340 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.160554 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.160786 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.160990 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.161118 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.161218 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.161320 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.161416 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:15.812258 read(8, "\372", 1)      = 1
09:26:15.812513 write(15, "\0", 1)      = 1
09:26:15.812724 write(9, "\372", 1)     = 1
09:26:15.813013 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.813422 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:15.813761 read(8, "\372", 1)      = 1
09:26:15.813968 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814089 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814204 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814317 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814489 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814621 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814735 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814832 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.160900 read(8, "\372", 1)      = 1
09:26:16.161383 futex(0x7ff2ccf2aeb0, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.161777 write(9, "\372", 1)     = 1
09:26:16.162165 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162330 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.162499 read(8, "\372", 1)      = 1
09:26:16.162613 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162713 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.162827 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162924 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.163038 write(15, "\0", 1)      = 1
09:26:16.163247 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.163551 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.163707 read(8, "\372", 1)      = 1
09:26:16.163813 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.163917 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.164040 write(9, "\372", 1)     = 1
09:26:16.164144 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.164242 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.164347 read(8, "\372", 1)      = 1
09:26:16.164442 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.164539 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.164979 futex(0x7ff2ddd32400, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.165093 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.165325 write(15, "\0", 1)      = 1
09:26:16.165524 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.165663 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.165780 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.165879 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.165989 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.166088 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.166187 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.166283 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=17, revents=POLLIN}])
09:26:20.210584 recvmsg(17, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="U\2\252\0)W\243\6\3\24\4\0\20\0\0\0\0\0\0\24\24\24\24\24\0\0\3\37%\2\0\0", iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
09:26:20.211114 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:20.211507 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:20.211829 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.165886 read(8, "\372", 1)      = 1
09:26:21.166321 futex(0x7ff2ccf2aeb4, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.166762 write(9, "\372", 1)     = 1
09:26:21.167163 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.167331 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.167582 read(8, "\372", 1)      = 1
09:26:21.167842 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.167966 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.168159 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.168331 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.168465 write(15, "\0", 1)      = 1
09:26:21.168673 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.168875 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.169007 read(8, "\372", 1)      = 1
09:26:21.169112 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169242 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.169376 write(9, "\372", 1)     = 1
09:26:21.169503 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169607 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.169715 read(8, "\372", 1)      = 1
09:26:21.169820 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169928 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.170383 futex(0x7ff2ddd32404, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.170484 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.170715 write(15, "\0", 1)      = 1
09:26:21.170927 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171092 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171210 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171310 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171419 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171520 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171620 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)

So it at least occasionally calls poll with a non-zero timeout.

this is similar directly after startup.

Best regards
Uwe

#987704#20

Date:: 2021-05-21 07:35:46 UTC

From:

To:

I checked now what that WebExtensions process does directly after
starting, there it looks like following:

09:26:10.657028 restart_syscall(<... resuming interrupted read ...>) = 1
09:26:11.155145 read(8, "\372", 1)      = 1
09:26:11.155647 futex(0x7ff2ccf2aeb4, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.156104 write(9, "\372", 1)     = 1
09:26:11.156379 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.156848 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.157099 read(8, "\372", 1)      = 1
09:26:11.157342 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.157457 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.157786 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.157940 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.158081 write(15, "\0", 1)      = 1
09:26:11.158385 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.158535 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.158652 read(8, "\372", 1)      = 1
09:26:11.158754 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.158852 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.158974 write(9, "\372", 1)     = 1
09:26:11.159077 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.159174 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:11.159284 read(8, "\372", 1)      = 1
09:26:11.159395 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.159496 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.159964 futex(0x7ff2ddd32404, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.160060 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:11.160201 write(15, "\0", 1)      = 1
09:26:11.160340 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.160554 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.160786 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.160990 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.161118 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.161218 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:11.161320 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:11.161416 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:15.812258 read(8, "\372", 1)      = 1
09:26:15.812513 write(15, "\0", 1)      = 1
09:26:15.812724 write(9, "\372", 1)     = 1
09:26:15.813013 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.813422 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:15.813761 read(8, "\372", 1)      = 1
09:26:15.813968 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814089 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814204 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814317 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814489 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814621 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:15.814735 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:15.814832 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.160900 read(8, "\372", 1)      = 1
09:26:16.161383 futex(0x7ff2ccf2aeb0, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.161777 write(9, "\372", 1)     = 1
09:26:16.162165 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162330 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.162499 read(8, "\372", 1)      = 1
09:26:16.162613 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162713 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.162827 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.162924 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.163038 write(15, "\0", 1)      = 1
09:26:16.163247 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.163551 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.163707 read(8, "\372", 1)      = 1
09:26:16.163813 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.163917 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.164040 write(9, "\372", 1)     = 1
09:26:16.164144 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.164242 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:16.164347 read(8, "\372", 1)      = 1
09:26:16.164442 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.164539 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.164979 futex(0x7ff2ddd32400, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.165093 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:16.165325 write(15, "\0", 1)      = 1
09:26:16.165524 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.165663 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.165780 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.165879 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.165989 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.166088 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:16.166187 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:16.166283 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=17, revents=POLLIN}])
09:26:20.210584 recvmsg(17, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="U\2\252\0)W\243\6\3\24\4\0\20\0\0\0\0\0\0\24\24\24\24\24\0\0\3\37%\2\0\0", iov_len=4096}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 32
09:26:20.211114 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:20.211507 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:20.211829 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, -1) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.165886 read(8, "\372", 1)      = 1
09:26:21.166321 futex(0x7ff2ccf2aeb4, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.166762 write(9, "\372", 1)     = 1
09:26:21.167163 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.167331 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.167582 read(8, "\372", 1)      = 1
09:26:21.167842 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.167966 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.168159 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.168331 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.168465 write(15, "\0", 1)      = 1
09:26:21.168673 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.168875 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.169007 read(8, "\372", 1)      = 1
09:26:21.169112 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169242 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.169376 write(9, "\372", 1)     = 1
09:26:21.169503 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169607 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 1 ([{fd=8, revents=POLLIN}])
09:26:21.169715 read(8, "\372", 1)      = 1
09:26:21.169820 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.169928 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.170383 futex(0x7ff2ddd32404, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.170484 futex(0x7ff2ddd323a8, FUTEX_WAKE_PRIVATE, 1) = 1
09:26:21.170715 write(15, "\0", 1)      = 1
09:26:21.170927 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171092 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171210 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171310 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171419 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)
09:26:21.171520 poll([{fd=8, events=POLLIN}, {fd=17, events=POLLIN}, {fd=18, events=POLLIN}], 3, 0) = 0 (Timeout)
09:26:21.171620 recvmsg(17, {msg_namelen=0}, 0) = -1 EAGAIN (Resource temporarily unavailable)

So it at least occasionally calls poll with a non-zero timeout.

this is similar directly after startup.

Best regards
Uwe

#987704#25

Date:: 2021-07-05 21:01:59 UTC

From:

To:

Hey.

I think this might be the same than:
#986567
#986027

and not just affecting foxyproxy... but rather all extensions.

Cheers,
Chris.

#987704 webextensions 100% cpu stalling #987704

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