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Date:	Sat, 01 Jun 2013 15:48:26 +0200
From:	Toralf Förster <>
Subject: Re: found a scenario for BUG at fs/ext4/super.c:804!

On 05/30/2013 08:06 PM, Toralf Förster wrote:
> On 05/30/2013 07:58 PM, Toralf Förster wrote:
>> 11. if that attempt fails stop the nfs service and run the umount command again - it segfaults now
> forgot to mention that after that just sysrq+b thelps me to reboot the
> machine, a "sync" does not come back nor can be interrupted with Ctrl-C,
> "reboot" don't work too - OTOH I'm able to write an email and save it as
> a draft.

sysrq+w gave :

2013-06-01T15:30:25.825+02:00 n22 kernel: SysRq : Show Blocked State
2013-06-01T15:30:25.825+02:00 n22 kernel: task                PC stack   pid father
2013-06-01T15:30:25.825+02:00 n22 kernel: kworker/0:1     D f08f7db0     0    29      2 0x00000000
2013-06-01T15:30:25.825+02:00 n22 kernel: Workqueue: events do_sync_work
2013-06-01T15:30:25.825+02:00 n22 kernel: f22b9e88 00000046 00000000 f08f7db0 00000008 e7a9080b 00000a16 f22b9e34
2013-06-01T15:30:25.825+02:00 n22 kernel: c16b1400 c104ec08 c16b1400 f37ba400 f21b8d50 ef1a39b0 00000296 b9b6e892
2013-06-01T15:30:25.825+02:00 n22 kernel: f22b9eb0 7fffffff f22b9eac f22b9e78 c14803f3 f21b8d50 00000001 f21b8d50
2013-06-01T15:30:25.825+02:00 n22 kernel: Call Trace:
2013-06-01T15:30:25.825+02:00 n22 kernel: [<c104ec08>] ? try_to_grab_pending+0x98/0x130
2013-06-01T15:30:25.825+02:00 n22 kernel: [<c14803f3>] ? wait_for_completion+0x83/0xc0
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c1062410>] ? try_to_wake_up+0x220/0x220
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c1480453>] schedule+0x23/0x60
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c1480d15>] rwsem_down_read_failed+0x75/0xb2
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c12da18f>] call_rwsem_down_read_failed+0x7/0xc
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c147f24c>] ? down_read+0x1c/0x1f
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c11208d2>] iterate_supers+0x62/0xc0
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c1144fa0>] ? fdatawrite_one_bdev+0x20/0x20
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c1144f22>] do_sync_work+0x22/0x80
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c104e62e>] process_one_work+0x10e/0x390
2013-06-01T15:30:25.826+02:00 n22 kernel: [<c104f602>] worker_thread+0x102/0x320
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c104f500>] ? manage_workers.isra.24+0x290/0x290
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1054b74>] kthread+0x94/0xa0
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1481a37>] ret_from_kernel_thread+0x1b/0x28
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1054ae0>] ? flush_kthread_worker+0x90/0x90
2013-06-01T15:30:25.827+02:00 n22 kernel: sync            D f08f7db0     0 27190  27033 0x00000000
2013-06-01T15:30:25.827+02:00 n22 kernel: ef57ff38 00000082 00000000 f08f7db0 00000008 c7f4f883 00000a15 ef57fee4
2013-06-01T15:30:25.827+02:00 n22 kernel: c16b1400 c104ec08 c16b1400 f37c7400 eeed4fe0 ef1a39b0 00000296 2a2f912a
2013-06-01T15:30:25.827+02:00 n22 kernel: ef57ff60 7fffffff ef57ff5c ef57ff28 c14803f3 eeed4fe0 00000001 eeed4fe0
2013-06-01T15:30:25.827+02:00 n22 kernel: Call Trace:
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c104ec08>] ? try_to_grab_pending+0x98/0x130
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c14803f3>] ? wait_for_completion+0x83/0xc0
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1062410>] ? try_to_wake_up+0x220/0x220
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1480453>] schedule+0x23/0x60
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1480d15>] rwsem_down_read_failed+0x75/0xb2
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c12da18f>] call_rwsem_down_read_failed+0x7/0xc
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c147f24c>] ? down_read+0x1c/0x1f
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c11208d2>] iterate_supers+0x62/0xc0
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1144fa0>] ? fdatawrite_one_bdev+0x20/0x20
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c11450d1>] sys_sync+0x31/0x80
2013-06-01T15:30:25.827+02:00 n22 kernel: [<c1481ac1>] sysenter_do_call+0x12/0x22
2013-06-01T15:30:25.828+02:00 n22 kernel: kworker/0:0     D f08f7db0     0 27191      2 0x00000000
2013-06-01T15:30:25.828+02:00 n22 kernel: Workqueue: events do_sync_work
2013-06-01T15:30:25.828+02:00 n22 kernel: ea5e9e88 00000046 00000000 f08f7db0 00000008 42845398 00000a17 eeed0336
2013-06-01T15:30:25.828+02:00 n22 kernel: c16b1400 c104ec08 c16b1400 f37ba400 eeed4290 eeed0000 00000296 c1535c4d
2013-06-01T15:30:25.828+02:00 n22 kernel: ea5e9eb0 7fffffff ea5e9eac ea5e9e78 c14803f3 eeed4290 00000001 eeed4290
2013-06-01T15:30:25.828+02:00 n22 kernel: Call Trace:
2013-06-01T15:30:25.828+02:00 n22 kernel: [<c104ec08>] ? try_to_grab_pending+0x98/0x130
2013-06-01T15:30:25.828+02:00 n22 kernel: [<c14803f3>] ? wait_for_completion+0x83/0xc0
2013-06-01T15:30:25.828+02:00 n22 kernel: [<c1062410>] ? try_to_wake_up+0x220/0x220
2013-06-01T15:30:25.828+02:00 n22 kernel: [<c1480453>] schedule+0x23/0x60
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1480d15>] rwsem_down_read_failed+0x75/0xb2
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c12da18f>] call_rwsem_down_read_failed+0x7/0xc
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c147f24c>] ? down_read+0x1c/0x1f
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c11208d2>] iterate_supers+0x62/0xc0
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1144fa0>] ? fdatawrite_one_bdev+0x20/0x20
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1144f22>] do_sync_work+0x22/0x80
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c104e62e>] process_one_work+0x10e/0x390
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c104f602>] worker_thread+0x102/0x320
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c104f500>] ? manage_workers.isra.24+0x290/0x290
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1054b74>] kthread+0x94/0xa0
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1481a37>] ret_from_kernel_thread+0x1b/0x28
2013-06-01T15:30:25.829+02:00 n22 kernel: [<c1054ae0>] ? flush_kthread_worker+0x90/0x90
2013-06-01T15:30:58.399+02:00 n22 kernel: SysRq : Emergency Sync

Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3
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