Re: kernel crashes on commit

["Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>]

Hi Dros,

after adopting patch for RHEL6 kernel, it works.
We have to push it into stable fixes. Do you know
the procedure?

Thanks,
   Tigran.

----- Original Message -----
> From: "Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>
> To: "Weston Andros Adamson" <dros@primarydata.com>
> Cc: "Linux NFS Mailing List" <linux-nfs@vger.kernel.org>
> Sent: Tuesday, January 20, 2015 10:45:22 PM
> Subject: Re: kernel crashes on commit

> I will check tomorrow with RHEL 6 kernel and let you known.
> 
> Thanks,
>  TigranOn Jan 20, 2015 9:43 PM, Weston Andros Adamson <dros@primarydata.com>
>  wrote:
>>
>>
>> > On Jan 20, 2015, at 2:22 PM, Mkrtchyan, Tigran <tigran.mkrtchyan@desy.de> wrote:
>> > 
>> > Hi Dros,
>> > 
>> > do you refer to this commit
>> > 
>> > http://git.linux-nfs.org/?p=dros/linux-nfs.git;a=commit;h=d201c4de518c1d617aa216664869fa329d562d7d
>> > ?
>>
>> Yes, that’s the patch I was talking about. Good find, I was about to go looking
>> for it.
>>
>> Is that patch in the kernels you’re testing?
>>
>> -dros
>>
>> > ----- Original Message -----
>> >> From: "Weston Andros Adamson" <dros@primarydata.com>
>> >> To: "Tigran Mkrtchyan" <tigran.mkrtchyan@desy.de>
>> >> Cc: "linux-nfs list" <linux-nfs@vger.kernel.org>
>> >> Sent: Tuesday, January 20, 2015 3:37:49 PM
>> >> Subject: Re: kernel crashes on commit
>> > 
>> >>> On Jan 20, 2015, at 9:00 AM, Mkrtchyan, Tigran <tigran.mkrtchyan@desy.de> wrote:
>> >>> 
>> >>> 
>> >>> 
>> >>> Dear fellows,
>> >>> 
>> >>> since we have enabled commit through DS code we
>> >>> permanently observe kernel crashes with RHEL6/7 and ubuntu 14.04:
>> >>> 
>> >>> 
>> >>> <1>BUG: unable to handle kernel paging request at 00000000dc364913
>> >>> <1>IP: [<ffffffffa02b45df>] nfs_init_commit+0x1f/0xf0 [nfs]
>> >>> <4>PGD 6393ae067 PUD 0
>> >>> <4>Oops: 0000 [#1] SMP
>> >>> <4>last sysfs file: /sys/devices/system/cpu/online
>> >>> <4>CPU 1
>> >>> <4>Modules linked in: vfat fat usb_storage mpt3sas mpt2sas raid_class mptctl
>> >>> ipmi_devintf dell_rbu openafs(P)(U) autof
>> >>> s4 nfs_layout_nfsv41_files nfs lockd fscache auth_rpcgss nfs_acl sunrpc bonding
>> >>> 8021q garp stp llc ipv6 power_meter ac
>> >>> pi_ipmi ipmi_si ipmi_msghandler iTCO_wdt iTCO_vendor_support microcode dcdbas sg
>> >>> bnx2 lpc_ich mfd_core i7core_edac eda
>> >>> c_core ext4 jbd2 mbcache sd_mod crc_t10dif wmi pata_acpi ata_generic ata_piix
>> >>> mptsas mptscsih mptbase scsi_transport_s
>> >>> as dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]
>> >>> <4>
>> >>> <4>Pid: 18209, comm: flush-0:19 Tainted: P           ---------------
>> >>> 2.6.32-504.3.3.el6.x86_64 #1 Dell Inc. PowerEdge M610/0N582M
>> >>> <4>RIP: 0010:[<ffffffffa02b45df>]  [<ffffffffa02b45df>]
>> >>> nfs_init_commit+0x1f/0xf0 [nfs]
>> >>> <4>RSP: 0018:ffff88063988da30  EFLAGS: 00010246
>> >>> <4>RAX: ffff88063988db60 RBX: ffff88009c492040 RCX: ffff88063988db30
>> >>> <4>RDX: 0000000000000000 RSI: ffff88063988db60 RDI: 00000000dc364903
>> >>> <4>RBP: ffff88063988da40 R08: ffff88063988da90 R09: f9aa37faa254d404
>> >>> <4>R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000001
>> >>> <4>R13: ffff880339f33a00 R14: ffff88063988db30 R15: ffff88063988d8c8
>> >>> <4>FS:  0000000000000000(0000) GS:ffff880028200000(0000) knlGS:0000000000000000
>> >>> <4>CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
>> >>> <4>CR2: 00000000dc364913 CR3: 0000000639fbb000 CR4: 00000000000007e0
>> >>> <4>DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> >>> <4>DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
>> >>> <4>Process flush-0:19 (pid: 18209, threadinfo ffff88063988c000, task
>> >>> ffff88063837c040)
>> >>> <4>Stack:
>> >>> <4> 0000000000000000 ffff88009c492040 ffff88063988dad0 ffffffffa031fdb7
>> >>> <4><d> ffff88063837c5f8 ffff88063988da90 ffff8800a6e34600 ffff880337f2a950
>> >>> <4><d> ffff880637c99488 0000000037f2a940 ffff88063988db60 0000000000000000
>> >>> <4>Call Trace:
>> >>> <4> [<ffffffffa031fdb7>] filelayout_commit_pagelist+0x277/0x3c0
>> >>> [nfs_layout_nfsv41_files]
>> >>> <4> [<ffffffffa02b613b>] nfs_generic_commit_list+0xab/0x100 [nfs]
>> >>> <4> [<ffffffffa02b627c>] nfs_commit_inode+0xec/0x150 [nfs]
>> >>> <4> [<ffffffffa02b6aab>] nfs_write_inode+0xab/0x100 [nfs]
>> >>> <4> [<ffffffff811baedc>] writeback_single_inode+0x20c/0x290
>> >>> <4> [<ffffffff811bb1ad>] writeback_sb_inodes+0xbd/0x170
>> >>> <4> [<ffffffff811bb30b>] writeback_inodes_wb+0xab/0x1b0
>> >>> <4> [<ffffffff811bb703>] wb_writeback+0x2f3/0x410
>> >>> <4> [<ffffffff8100b9ce>] ? common_interrupt+0xe/0x13
>> >>> <4> [<ffffffff81088062>] ? del_timer_sync+0x22/0x30
>> >>> <4> [<ffffffff811bb9c5>] wb_do_writeback+0x1a5/0x240
>> >>> <4> [<ffffffff811bbac3>] bdi_writeback_task+0x63/0x1b0
>> >>> <4> [<ffffffff8109e987>] ? bit_waitqueue+0x17/0xd0
>> >>> <4> [<ffffffff81148360>] ? bdi_start_fn+0x0/0x100
>> >>> <4> [<ffffffff811483e6>] bdi_start_fn+0x86/0x100
>> >>> <4> [<ffffffff81148360>] ? bdi_start_fn+0x0/0x100
>> >>> <4> [<ffffffff8109e66e>] kthread+0x9e/0xc0
>> >>> <4> [<ffffffff8100c20a>] child_rip+0xa/0x20
>> >>> <4> [<ffffffff8109e5d0>] ? kthread+0x0/0xc0
>> >>> <4> [<ffffffff8100c200>] ? child_rip+0x0/0x20
>> >>> <4>Code: c3 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 53 48 83 ec 08 0f 1f 44
>> >>> 00 00 48 8b 06 48 89 fb 48 8b 78 18 48 39 c6 48 8b 7f 40 <48> 8b 7f 10 74 2b 4c
>> >>> 8b 83 c8 01 00 00 4c 8b 4e 08 4c 8d 93 c8
>> >>> <1>RIP  [<ffffffffa02b45df>] nfs_init_commit+0x1f/0xf0 [nfs]
>> >>> <4> RSP <ffff88063988da30>
>> >>> <4>CR2: 00000000dc364913
>> >>> 
>> >>> 
>> >>> I have vmcore file as well, so let me know if you need some more information.
>> >>> 
>> >> 
>> >> Hi Tigran!
>> >> 
>> >> Have you tried a recent upstream kernel? IIRC I fixed a seeming similar
>> >> filelayout
>> >> commit issue not too long ago.
>> >> 
>> >> The filelayout commit path seems to have been broken for a while - mostly
>> >> because
>> >> all the filelayout servers (that I know of) use stable writes, so that code path
>> >> went
>> >> untested...
>> >> 
>> >> -dros
>>
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