linux-kernel - Re: [Regression,bisected] 2.6.39-rc3 ceph client write hangs

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Message-ID: <Pine.LNX.4.64.1104172249540.18433@cobra.newdream.net>
Date:	Sun, 17 Apr 2011 22:52:40 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Jim Schutt <jaschut@...dia.gov>
cc:	Maciej Rutecki <maciej.rutecki@...il.com>, dchinner@...hat.com,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	"ceph-devel@...r.kernel.org" <ceph-devel@...r.kernel.org>
Subject: Re: [Regression,bisected] 2.6.39-rc3 ceph client write hangs

This was a simple s/igrab/ihold/ fix.  See

283a85dc6e670083adb1e5437bd93d163f4f801a

in the for-linus branch of ceph-client.git.  I'll push to Linus in the 
next few days.

Thanks!
sage




On Sun, 17 Apr 2011, Maciej Rutecki wrote:

> I created a Bugzilla entry at 
> https://bugzilla.kernel.org/show_bug.cgi?id=33452
> for your bug report, please add your address to the CC list in there, thanks!
> 
> On piÿÿtek, 15 kwietnia 2011 o 19:00:58 Jim Schutt wrote:
> > Hi,
> > 
> > This command is hanging on 2.6.39-rc3, where /mnt/ceph is
> > a ceph file system:
> >    dd conv=fdatasync if=/dev/zero of=/mnt/ceph/zero.`hostname -s` bs=4k
> > count=4k
> > 
> > It works on 2.6.38.  As of commit e38f5b745075 in Linus'
> > tree it still doesn't work.
> > 
> > I bisected this to:
> > 
> > 250df6ed274d767da844a5d9f05720b804240197 is the first bad commit
> > commit 250df6ed274d767da844a5d9f05720b804240197
> > Author: Dave Chinner <dchinner@...hat.com>
> > Date:   Tue Mar 22 22:23:36 2011 +1100
> > 
> >      fs: protect inode->i_state with inode->i_lock
> > 
> > In the early stages of the bisection, bad commits would show this
> > in dmesg:
> > 
> > [  137.004963] libceph: loaded (mon/osd proto 15/24, osdmap 5/6 5/6)
> > [  137.056431] ceph: loaded (mds proto 32)
> > [  137.063213] libceph: client4283 fsid
> > 950217ad-499e-eab1-03f7-f6d245f42751 [  137.063826] libceph: mon0
> > 172.17.40.34:6789 session established [  219.658002] INFO: rcu_sched_state
> > detected stall on CPU 0 (t=60000 jiffies)
> > 
> > For the last couple of bad commits during the bisection, the
> > client box would just hang and I'd have to power-cycle it.
> > 
> > When I reboot/remount after a hang, the file I was trying
> > to write is there, with size and date both zero:
> > 
> > # ls -l --time-style=+%s /mnt/ceph/zero.an1024
> > -rw-r--r-- 1 jaschut jaschut 0 0 /mnt/ceph/zero.an1024
> > 
> > strace suggests it's the write that hangs:
> > 
> > close(3)                                = 0
> > close(0)                                = 0
> > open("/dev/zero", O_RDONLY)             = 0
> > lseek(0, 0, SEEK_CUR)                   = 0
> > close(1)                                = 0
> > open("/mnt/ceph/zero.an1024", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 1
> > rt_sigaction(SIGUSR1, NULL, {SIG_DFL, [], 0}, 8) = 0
> > rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
> > rt_sigaction(SIGUSR1, {0x401a20, [INT USR1], SA_RESTORER, 0x7f3a97f292d0},
> > NULL, 8) = 0 rt_sigaction(SIGINT, {0x401a10, [INT USR1],
> > SA_RESTORER|SA_NODEFER|SA_RESETHAND, 0x7f3a97f292d0}, NULL, 8) = 0
> > clock_gettime(CLOCK_MONOTONIC, {216, 671807533}) = 0
> > read(0,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> > 4096) = 4096 write(1,
> > "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> > 4096
> > 
> > Let me know if I can do anything else to help sort this out.
> > 
> > -- Jim
> > 
> > (Please Cc: me as I am not subscribed to lkml.)
> > 
> > --
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> 
> -- 
> Maciej Rutecki
> http://www.maciek.unixy.pl
> --
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>