Messages in this thread | | | Date | Fri, 15 Dec 2006 13:41:16 -0800 | From | Andrew Morton <> | Subject | Re: 2.6.18 mmap hangs unrelated apps |
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On Fri, 15 Dec 2006 15:35:00 -0600 Michal Sabala <lkml@saahbs.net> wrote:
> On 2006/12/15 at 14:42:08 Andrew Morton <akpm@osdl.org> wrote > > On Fri, 15 Dec 2006 11:50:30 -0600 > > Michal Sabala <lkml@saahbs.net> wrote: > > > > > On 2006/12/15 at 10:24:15 Trond Myklebust <trond.myklebust@fys.uio.no> wrote > > > > On Thu, 2006-12-14 at 20:30 -0600, Michal Sabala wrote: > > > > > > > > > > `cat /proc/*PID*/wchan` for all hanging processes contains page_sync. > > > > > > > > Have you tried an 'echo t >/proc/sysrq-trigger' on a client with one of > > > > these hanging processes? If so, what does the output look like? > > > > > > Hello Trond, > > > > > > Below is the sysrq trace output for XFree86 which entered the > > > uninterruptible sleep state on the P4 machine with nfs /home. Please > > > note that XFree86 does not have any files open in /home - as reported by > > > `lsof`. Below, I also listed the output of vmstat. > > > > We'd need to see the trace of all D-state processes, please. Xfree86 might > > just be a victim of a deadlock elsewhere. However there is a problem here.. > > Hi Andrew, > > In most cases only a single process enters the D-state, this time it was > XFree, but I've seen gimp, firefox, gconfd and bash. Once or twice I did > see two or three processes ending up in uninterruptible sleep, but I > suspect they entered this state at different test-mmap.c runs (I left > test-mmap.c running in a bash loop and checked the system after a few > hours).
OK, useful info, thanks.
> Would it be beneficial to keep running test-mmap.c on this machine until > two or more processes end up in D-state? I can leave this machine > running test-mmap.c over the weekend.
No, that's OK. The next step should be for a kernel wrangler to get in there with your testcase. It could well be that lock_page-inside-lock_page thing.
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