Messages in this thread | | | From | walt <> | Subject | Re: [2.6.34-git8][regression] massive polling problems with udevd and other processes | Date | Sun, 23 May 2010 11:18:22 -0700 |
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On 05/22/2010 03:59 PM, Eric Paris wrote: > On Sat, May 22, 2010 at 4:44 PM, Al Viro<viro@zeniv.linux.org.uk> wrote: >> On Sat, May 22, 2010 at 01:21:19PM -0700, walt wrote: >>> On 05/22/2010 12:35 PM, Shawn Starr wrote: >>>> Just built today's snapshot from linus's tree and have problems with udev >>>> using 100% cpu and KDE processes also pegging cpus. >>>> >>>> This is with Fedora 13 + snapshot kernel from git. >>>> >>>> Anyone else noticing this? >>> >>> Yes, just bisected it to this: >>> >>> commit a7cf4145bb86aaf85d4d4d29a69b50b688e2e49d >>> Author: Eric Paris<eparis@> >>> Date: Fri May 14 11:44:10 2010 -0400 >>> >>> anon_inode: set S_IFREG on the anon_inode >> >> Cute... Frankly, I'd be fine with just reverting that one and teaching >> selinux to STFU. However, I wonder what specifically is getting polled. >> Which anon_inode users? > > On my system udev has both inotify and signalfd open. He's asking for > more of the strace. If the ONLY thing that udev is doing is polling > with no other syscalls at all it's a udev problem (although maybe one > where we have to maintain bug for bug compatibility. > > Can you show us a more lines of strace context and the output of ls -l > /proc/$PID/fd ? That should give us a better idea what udev is doing > and which anon_inode we are dealing with.
strace is just very rapidly printing out thousands of identical lines like the one I posted earlier. Here is a new run:
$head /tmp/strace ioctl(6, FIONREAD, [0]) = 0 poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}]) ioctl(6, FIONREAD, [0]) = 0 poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}]) ioctl(6, FIONREAD, [0]) = 0 poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}]) ioctl(6, FIONREAD, [0]) = 0 poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}]) ioctl(6, FIONREAD, [0]) = 0 poll([{fd=4, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}, {fd=8, events=POLLIN}], 5, -1) = 1 ([{fd=6, revents=POLLIN}])
Here is the fd listing for the udevd process: $cat /tmp/fd lrwx------ 1 root root 64 2010-05-23 08:38 0 -> /dev/null lrwx------ 1 root root 64 2010-05-23 08:38 1 -> /dev/null lrwx------ 1 root root 64 2010-05-23 08:38 2 -> /dev/null lrwx------ 1 root root 64 2010-05-23 08:38 3 -> /dev/.udev/queue.bin lrwx------ 1 root root 64 2010-05-23 08:38 4 -> socket:[274] lrwx------ 1 root root 64 2010-05-23 08:38 5 -> socket:[275] lr-x------ 1 root root 64 2010-05-23 08:38 6 -> anon_inode:inotify lrwx------ 1 root root 64 2010-05-23 08:38 7 -> anon_inode:[signalfd] lrwx------ 1 root root 64 2010-05-23 08:38 8 -> socket:[276] lrwx------ 1 root root 64 2010-05-23 08:38 9 -> socket:[277]
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