linux-kernel - Re: CIFS-related deadlock in 3.10-rc7

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Date:	Thu, 11 Jul 2013 09:35:52 -0500
From:	Steve French <smfrench@...il.com>
To:	Pavel Shilovsky <piastryyy@...il.com>
Cc:	"Alexander E. Patrakov" <patrakov@...il.com>,
	linux-cifs <linux-cifs@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: CIFS-related deadlock in 3.10-rc7

Wouldn't this be a candidate for stable?

On Thu, Jul 11, 2013 at 7:53 AM, Pavel Shilovsky <piastryyy@...il.com> wrote:
> 2013/7/7 Alexander E. Patrakov <patrakov@...il.com>:
>> While playing a file from a CIFS-mounted samba share (over wireless,
>> if that matters), I got this deadlock:
>>
>> [ 2164.132440] =============================================
>> [ 2164.132443] [ INFO: possible recursive locking detected ]
>> [ 2164.132446] 3.10.0-rc7-rafael+ #26 Tainted: G         C
>> [ 2164.132448] ---------------------------------------------
>> [ 2164.132452] vlc/2370 is trying to acquire lock:
>> [ 2164.132454]  (&cifsi->lock_sem){++++.+}, at: [<ffffffffa0913110>]
>> cifs_reopen_file+0x270/0x5b0 [cifs]
>> [ 2164.132472]
>> but task is already holding lock:
>> [ 2164.132475]  (&cifsi->lock_sem){++++.+}, at: [<ffffffffa0918ca8>]
>> cifs_strict_readv+0x88/0x160 [cifs]
>> [ 2164.132488]
>> other info that might help us debug this:
>> [ 2164.132491]  Possible unsafe locking scenario:
>>
>> [ 2164.132494]        CPU0
>> [ 2164.132496]        ----
>> [ 2164.132498]   lock(&cifsi->lock_sem);
>> [ 2164.132502]   lock(&cifsi->lock_sem);
>> [ 2164.132505]
>>  *** DEADLOCK ***
>>
>> [ 2164.132508]  May be due to missing lock nesting notation
>>
>> [ 2164.132511] 1 lock held by vlc/2370:
>> [ 2164.132513]  #0:  (&cifsi->lock_sem){++++.+}, at:
>> [<ffffffffa0918ca8>] cifs_strict_readv+0x88/0x160 [cifs]
>> [ 2164.132526]
>> stack backtrace:
>> [ 2164.132531] CPU: 3 PID: 2370 Comm: vlc Tainted: G         C
>> 3.10.0-rc7-rafael+ #26
>> [ 2164.132534] Hardware name: Sony Corporation VPCZ23A4R/VAIO, BIOS
>> R1013H5 05/21/2012
>> [ 2164.132537]  ffff880235033f80 ffff8802281fb958 ffffffff8165b7ae
>> ffff8802281fba48
>> [ 2164.132544]  ffffffff810a0042 ffff8802281fb978 ffffffff826360d0
>> ffff8802281fb9c8
>> [ 2164.132550]  0000000000000000 0000000000000000 00000000000389b0
>> ffff880200000542
>> [ 2164.132556] Call Trace:
>> [ 2164.132564]  [<ffffffff8165b7ae>] dump_stack+0x19/0x1b
>> [ 2164.132569]  [<ffffffff810a0042>] __lock_acquire+0x1522/0x1ee0
>> [ 2164.132579]  [<ffffffffa091aa41>] ? cifs_get_inode_info+0x181/0x690 [cifs]
>> [ 2164.132587]  [<ffffffffa0913110>] ? cifs_reopen_file+0x270/0x5b0 [cifs]
>> [ 2164.132591]  [<ffffffff810a1027>] lock_acquire+0x87/0x150
>> [ 2164.132598]  [<ffffffffa0913110>] ? cifs_reopen_file+0x270/0x5b0 [cifs]
>> [ 2164.132604]  [<ffffffff8165ed3f>] down_write+0x3f/0x70
>> [ 2164.132612]  [<ffffffffa0913110>] ? cifs_reopen_file+0x270/0x5b0 [cifs]
>> [ 2164.132622]  [<ffffffffa0927a76>] ? cifs_set_fid+0x26/0x40 [cifs]
>> [ 2164.132632]  [<ffffffffa0913110>] cifs_reopen_file+0x270/0x5b0 [cifs]
>> [ 2164.132642]  [<ffffffffa0913d0b>] cifs_readpage_worker+0x1ab/0x4e0 [cifs]
>> [ 2164.132652]  [<ffffffffa091427e>] cifs_readpage+0x5e/0x160 [cifs]
>> [ 2164.132660]  [<ffffffff81109b87>] generic_file_aio_read+0x217/0x760
>> [ 2164.132670]  [<ffffffffa0918d51>] cifs_strict_readv+0x131/0x160 [cifs]
>> [ 2164.132675]  [<ffffffff8116fff5>] do_sync_read+0x75/0xb0
>> [ 2164.132681]  [<ffffffff81170ef7>] vfs_read+0xa7/0x180
>> [ 2164.132686]  [<ffffffff81171170>] SyS_read+0x50/0xa0
>> [ 2164.132691]  [<ffffffff81668e16>] system_call_fastpath+0x1a/0x1f
>>
>> --
>> Alexander E. Patrakov
>> --
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>
> Thank you for pointing it out. I created a patch that should fix the
> problem - will sent separately.
>
> --
> Best regards,
> Pavel Shilovsky.
> --
> To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
> the body of a message to majordomo@...r.kernel.org
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-- 
Thanks,

Steve
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