[Regression,bisected] 2.6.39-rc3 ceph client write hangs

[Regression,bisected] 2.6.39-rc3 ceph client write hangs

[Jim Schutt]

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@redhat.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.)

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

[Maciej Rutecki]

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 piątek, 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@redhat.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.)
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
Maciej Rutecki
http://www.maciek.unixy.pl

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

[Sage Weil]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 3593 bytes --]

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@redhat.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.)
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/
> 
> -- 
> Maciej Rutecki
> http://www.maciek.unixy.pl
> --
> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 

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

[Maciej Rutecki]

On poniedziałek, 18 kwietnia 2011 o 07:52:40 Sage Weil wrote:
> 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, closing.

-- 
Maciej Rutecki
http://www.maciek.unixy.pl

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

[Jim Schutt]

Sage Weil wrote:
> This was a simple s/igrab/ihold/ fix.  See
> 
> 283a85dc6e670083adb1e5437bd93d163f4f801a
> 
> in the for-linus branch of ceph-client.git. 

This works for me.

Thanks - Jim

  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@redhat.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.)
>>>
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
>>> the body of a message to majordomo@vger.kernel.org
>>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>> Please read the FAQ at  http://www.tux.org/lkml/
>> -- 
>> Maciej Rutecki
>> http://www.maciek.unixy.pl
>> --
>> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>>