From: Alexander Aring <alex.aring@gmail.com>
To: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Cc: netdev@vger.kernel.org, rostedt@goodmis.org,
trond.myklebust@primarydata.com
Subject: Re: Race with ip=dhcp bootparameter in ip_rcv_finish on am335x
Date: Wed, 23 Sep 2015 14:27:15 +0200 [thread overview]
Message-ID: <20150923122714.GA31569@omega> (raw)
In-Reply-To: <20150923115757.GA23260@omega>
Hi,
On Wed, Sep 23, 2015 at 01:57:57PM +0200, Alexander Aring wrote:
...
> >
>
> Ok, I think I have two issues with two different races the first one was
> fixed by bde6f9ded1bd ("net: Initialize table in fib result"), but the
> second one is still there:
>
> [ 8.615806] ------------[ cut here ]------------
> [ 8.620678] Kernel BUG at c016c3d0 [verbose debug info unavailable]
> [ 8.627229] Internal error: Oops - BUG: 0 [#1] SMP ARM
> [ 8.632611] Modules linked in:
> [ 8.635836] CPU: 0 PID: 766 Comm: kworker/0:1H Tainted: G W 4.2.0-11248-gfbd0351 #140
> [ 8.645208] Hardware name: Generic AM33XX (Flattened Device Tree)
> [ 8.651616] Workqueue: rpciod xprt_autoclose
> [ 8.656091] task: ce3c52c0 ti: ce642000 task.ti: ce642000
> [ 8.661744] PC is at iput+0x1a8/0x1f0
> [ 8.665579] LR is at xprt_autoclose+0x2c/0x54
> [ 8.670136] pc : [<c016c3d0>] lr : [<c066c884>] psr: 20000113
> [ 8.670136] sp : ce643e80 ip : 00000000 fp : c0b56688
> [ 8.682133] r10: 00000001 r9 : ce643ec8 r8 : 00000000
> [ 8.687599] r7 : feff3000 r6 : ce615800 r5 : ce615bc0 r4 : ce615b54
> [ 8.694421] r3 : 00000060 r2 : 0000000f r1 : 0f10e000 r0 : cdbed720
> [ 8.701254] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none
> [ 8.708718] Control: 10c5387d Table: 80004019 DAC: 00000051
> [ 8.714732] Process kworker/0:1H (pid: 766, stack limit = 0xce642218)
> [ 8.721464] Stack: (0xce643e80 to 0xce644000)
> [ 8.726033] 3e80: c066f828 ce615b54 ce615bc0 ce615800 feff3000 00000000 ce643ec8 c066c884
> [ 8.734596] 3ea0: ce615b54 ce5ff440 cfb9e340 c0057928 00000001 00000000 c00578b4 cfb9e340
> [ 8.743152] 3ec0: c0057cc8 00000000 c137972c c0cc1960 00000000 c09979f4 cfb9e340 cfb9e340
> [ 8.751714] 3ee0: ce5ff458 cfb9e370 ce642000 00000008 c0b55ba0 ce5ff440 cfb9e340 c0057c54
> [ 8.760274] 3f00: ce659940 ce5ff440 c0057c18 00000000 ce659940 ce5ff440 c0057c18 00000000
> [ 8.768834] 3f20: 00000000 00000000 00000000 c005d918 c0b5697c 00000000 00000000 ce5ff440
> [ 8.777390] 3f40: 00000000 00000000 dead4ead ffffffff ffffffff c0b65d60 00000000 00000000
> [ 8.785951] 3f60: c0922088 ce643f64 ce643f64 00000000 00000000 dead4ead ffffffff ffffffff
> [ 8.794513] 3f80: c0b65d60 00000000 00000000 c0922088 ce643f90 ce643f90 ce643fac ce659940
> [ 8.803069] 3fa0: c005d844 00000000 00000000 c000f770 00000000 00000000 00000000 00000000
> [ 8.811628] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 8.820185] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 8fdf6861 8fdf6c61
> [ 8.828741] [<c016c3d0>] (iput) from [<c066c884>] (xprt_autoclose+0x2c/0x54)
> [ 8.836133] [<c066c884>] (xprt_autoclose) from [<c0057928>] (process_one_work+0x19c/0x48c)
> [ 8.844784] [<c0057928>] (process_one_work) from [<c0057c54>] (worker_thread+0x3c/0x4a0)
> [ 8.853256] [<c0057c54>] (worker_thread) from [<c005d918>] (kthread+0xd4/0xf0)
> [ 8.860827] [<c005d918>] (kthread) from [<c000f770>] (ret_from_fork+0x14/0x24)
> [ 8.868387] Code: e59f0044 e59f1044 ebfb467a eaffffc1 (e7f001f2)
Additional missing information is that I am booting via nfsroot and
xprt_autoclose is something from sunrpc.
Finally I figured out that commit
4876cc779ff525b9c2376d8076edf47815e71f2c ("SUNRPC: Ensure we release the
TCP socket once it has been closed") occur this races. After reverting
this commit everything works fine.
I added now:
Steven Rostedt <rostedt@goodmis.org>
Trond Myklebust <trond.myklebust@primarydata.com>
to cc to report about this issue.
- Alex
next prev parent reply other threads:[~2015-09-23 12:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-23 10:29 Race with ip=dhcp bootparameter in ip_rcv_finish on am335x Alexander Aring
2015-09-23 10:36 ` Nikolay Aleksandrov
2015-09-23 11:09 ` Alexander Aring
2015-09-23 11:58 ` Alexander Aring
2015-09-23 12:27 ` Alexander Aring [this message]
2015-09-23 12:54 ` Steven Rostedt
2015-09-23 13:16 ` Trond Myklebust
2015-09-24 5:48 ` Alexander Aring
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