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Date: Wed, 23 Sep 2015 13:58:02 +0200
From: Alexander Aring <alex.aring@...il.com>
To: Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
Cc: netdev@...r.kernel.org
Subject: Re: Race with ip=dhcp bootparameter in ip_rcv_finish on am335x
On Wed, Sep 23, 2015 at 12:36:13PM +0200, Nikolay Aleksandrov wrote:
> On 09/23/2015 12:29 PM, Alexander Aring wrote:
> > Hi,
> >
> > I am using am335x (beaglebone white) with "ip=dhcp" inside my
> > bootparameters. It seems there exists some race, rarely it boots fine
> > and often it crashed with following messages:
> >
> > First (Without successful dhcp ip assign and is very rarely):
> >
> > [ 6.249083] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
> > [ 6.398943] .
> > [ 7.400822] Unable to handle kernel paging request at virtual address 7402a8c8
> > [ 7.408419] pgd = c0004000
> > [ 7.411351] [7402a8c8] *pgd=00000000
> > [ 7.415121] Internal error: Oops: 5 [#1] SMP ARM
> > [ 7.419968] Modules linked in:
> > [ 7.423197] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 4.2.0-11195-ge81be90 #124
> > [ 7.432118] Hardware name: Generic AM33XX (Flattened Device Tree)
> > [ 7.438509] task: c0a996c8 ti: c0a92000 task.ti: c0a92000
> > [ 7.444189] PC is at ip_route_input_noref+0x620/0xeb4
> > [ 7.449491] LR is at trace_hardirqs_on_caller+0xb0/0x1e8
> <<<snip>>>
> > [ 7.759169] [<c054b49c>] (ip_route_input_noref) from [<c0550668>] (ip_rcv_finish+0xd4/0x67c)
> <<<snip>>>
> >
> > --------
> >
> > I tried to bisect this issue without success, sometimes it's booting fine
> > and sometimes I got the above messages. Could anybody help me here to
> > fixing this issue?
> >
> > - Alex
>
> Hi Alex,
> This should be fixed by commit bde6f9ded1bd
> ("net: Initialize table in fib result") in net-next.
>
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)
[ 8.874771] ---[ end trace 6c5e5808fb5c8423 ]---
[ 8.880045] Unable to handle kernel paging request at virtual address ffffffd0
[ 8.887603] pgd = c0004000
[ 8.890438] [ffffffd0] *pgd=8fdf6861, *pte=00000000, *ppte=00000000
[ 8.897034] Internal error: Oops: 37 [#2] SMP ARM
[ 8.901950] Modules linked in:
[ 8.905165] CPU: 0 PID: 766 Comm: kworker/0:1H Tainted: G D W 4.2.0-11248-gfbd0351 #140
[ 8.914530] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 8.920923] task: ce3c52c0 ti: ce642000 task.ti: ce642000
[ 8.926576] PC is at kthread_data+0x4/0xc
[ 8.930776] LR is at wq_worker_sleeping+0xc/0xd4
[ 8.935609] pc : [<c005dff0>] lr : [<c00589ec>] psr: 20000193
[ 8.935609] sp : ce643c18 ip : ce0b6e1c fp : ce643c7c
[ 8.947599] r10: 00000000 r9 : cfb9e640 r8 : ce3c568c
[ 8.953059] r7 : c0a90640 r6 : cfb9e650 r5 : ce3c52c0 r4 : 00000000
[ 8.959883] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : ce3c52c0
[ 8.966708] Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment none
[ 8.974263] Control: 10c5387d Table: 80004019 DAC: 00000051
[ 8.980271] Process kworker/0:1H (pid: 766, stack limit = 0xce642218)
[ 8.987000] Stack: (0xce643c18 to 0xce644000)
[ 8.991563] 3c00: 00000020 cfb9e640
[ 9.000123] 3c20: ce3c52c0 c0767578 ce3c52c0 c003fd14 00000001 00000000 c004046c c0ad6460
[ 9.008679] 3c40: c0b5697c c004046c ce2c31c4 c076792c ce390808 00000001 c0a8c400 ce642000
[ 9.017237] 3c60: ce643954 ce643c98 ce3c55e8 00000000 00000001 c016c3d2 ce643c8c c076792c
[ 9.025794] 3c80: 0420816c ce3c52c0 00000051 c0040554 c009b3f4 ce643cb4 ce643c98 ce643c98
[ 9.034347] 3ca0: c0a9b228 c0b64244 c0a9b228 60000193 0000000b 00000001 c0a9b228 c016c3d2
[ 9.042911] 3cc0: 00000051 c0013ca4 ce642218 0000000b c016c3d4 00000000 00000008 00000055
[ 9.051470] 3ce0: 00000051 00000055 65000000 30663935 20343430 66393565 34343031 66626520
[ 9.060030] 3d00: 37363462 61652061 66666666 28203163 30663765 32663130 c0002029 c016c3d0
[ 9.068591] 3d20: ce643df0 00030001 e7f001f2 c016c3d0 ce643df0 00000000 c076d064 ce642000
[ 9.077155] 3d40: c0b56688 c0009174 00000006 c13261e4 00000004 00000000 00030001 c016c3d0
[ 9.085710] 3d60: c0cc0a80 c00136c0 c10b33c8 c000f770 00000000 00000000 00000000 ce643fb0
[ 9.094274] 3d80: c000f770 c000f770 c10b33c8 c0eb2788 00000020 c0cc1960 c0cc0a80 ce3c5840
[ 9.102834] 3da0: c1351adc c008fd70 985722ac 0000000a ce3c5818 ce3c57f0 00000001 ce3c5838
[ 9.111390] 3dc0: 00000000 ce3c5820 ce3c5300 00000000 00000000 c016c3d4 00000000 c076d518
[ 9.119949] 3de0: 00000000 e7100000 c076d064 c076d064 cdbed720 0f10e000 0000000f 00000060
[ 9.128508] 3e00: ce615b54 ce615bc0 ce615800 feff3000 00000000 ce643ec8 00000001 c0b56688
[ 9.137066] 3e20: 00000000 ce643e80 c066c884 c016c3d0 20000113 ffffffff 00000051 00000004
[ 9.145618] 3e40: 00000006 ce643ec8 00000001 c008e0b8 c0042974 ce3c52c0 00000001 ce6619b4
[ 9.154183] 3e60: 00000000 c008e21c 00000200 c066f764 cdbed700 c0042974 ce3c52c0 ce615800
[ 9.162742] 3e80: c066f828 ce615b54 ce615bc0 ce615800 feff3000 00000000 ce643ec8 c066c884
[ 9.171301] 3ea0: ce615b54 ce5ff440 cfb9e340 c0057928 00000001 00000000 c00578b4 cfb9e340
[ 9.179856] 3ec0: c0057cc8 00000000 c137972c c0cc1960 00000000 c09979f4 cfb9e340 cfb9e340
[ 9.188414] 3ee0: ce5ff458 cfb9e370 ce642000 00000008 c0b55ba0 ce5ff440 cfb9e340 c0057c54
[ 9.196969] 3f00: ce659940 ce5ff440 c0057c18 00000000 ce659940 ce5ff440 c0057c18 00000000
[ 9.205528] 3f20: 00000000 00000000 00000000 c005d918 c0b5697c 00000000 00000000 ce5ff440
[ 9.214086] 3f40: 00000000 00000000 dead4ead ffffffff ffffffff c0b65d60 00000000 00000000
[ 9.222642] 3f60: c0922088 ce643f64 ce643f64 00000001 00010001 dead4ead ffffffff ffffffff
[ 9.231196] 3f80: c0b65d60 00000000 00000000 c0922088 ce643f90 ce643f90 ce643fac ce659940
[ 9.239755] 3fa0: c005d844 00000000 00000000 c000f770 00000000 00000000 00000000 00000000
[ 9.248316] 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 9.256869] 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 8fdf6861 8fdf6c61
[ 9.265435] [<c005dff0>] (kthread_data) from [<c00589ec>] (wq_worker_sleeping+0xc/0xd4)
[ 9.273822] [<c00589ec>] (wq_worker_sleeping) from [<c0767578>] (__schedule+0x684/0x9f8)
[ 9.282288] [<c0767578>] (__schedule) from [<c076792c>] (schedule+0x40/0x98)
[ 9.289673] [<c076792c>] (schedule) from [<c0040554>] (do_exit+0x660/0x9bc)
[ 9.296958] [<c0040554>] (do_exit) from [<c0013ca4>] (die+0x210/0x474)
[ 9.303790] [<c0013ca4>] (die) from [<c0009174>] (do_undefinstr+0x15c/0x21c)
[ 9.311177] [<c0009174>] (do_undefinstr) from [<c076d064>] (__und_svc_finish+0x0/0x3c)
[ 9.319453] Exception stack(0xce643df0 to 0xce643e38)
[ 9.324738] 3de0: cdbed720 0f10e000 0000000f 00000060
[ 9.333293] 3e00: ce615b54 ce615bc0 ce615800 feff3000 00000000 ce643ec8 00000001 c0b56688
[ 9.341848] 3e20: 00000000 ce643e80 c066c884 c016c3d0 20000113 ffffffff
[ 9.348771] [<c076d064>] (__und_svc_finish) from [<c016c3d0>] (iput+0x1a8/0x1f0)
[ 9.356513] [<c016c3d0>] (iput) from [<c066c884>] (xprt_autoclose+0x2c/0x54)
[ 9.363897] [<c066c884>] (xprt_autoclose) from [<c0057928>] (process_one_work+0x19c/0x48c)
[ 9.372543] [<c0057928>] (process_one_work) from [<c0057c54>] (worker_thread+0x3c/0x4a0)
[ 9.381005] [<c0057c54>] (worker_thread) from [<c005d918>] (kthread+0xd4/0xf0)
[ 9.388565] [<c005d918>] (kthread) from [<c000f770>] (ret_from_fork+0x14/0x24)
[ 9.396129] Code: e3a02002 eafffec7 c0774688 e5903380 (e5130030)
[ 9.402509] ---[ end trace 6c5e5808fb5c8424 ]---
[ 9.407333] Fixing recursive fault but reboot is needed!
- Alex
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