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Date: Wed, 13 Nov 2013 11:35:03 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Vivek Goyal <vgoyal@...hat.com>,
John Stultz <john.stultz@...aro.org>,
Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
Jens Axboe <axboe@...nel.dk>, Tejun Heo <tj@...nel.org>
Subject: Re: [seqcount] INFO: trying to register non-static key.
On Tue, Nov 12, 2013 at 04:29:56PM +0100, Peter Zijlstra wrote:
> On Tue, Nov 12, 2013 at 10:15:41AM -0500, Vivek Goyal wrote:
> > I see that we allocate per cpu stats but don't do any initializations.
> >
> > static void tg_stats_alloc_fn(struct work_struct *work)
> > {
> > static struct tg_stats_cpu *stats_cpu; /* this fn is non-reentrant */
> > struct delayed_work *dwork = to_delayed_work(work);
> > bool empty = false;
> >
> > alloc_stats:
> > if (!stats_cpu) {
> > stats_cpu = alloc_percpu(struct tg_stats_cpu);
> > if (!stats_cpu) {
> > /* allocation failed, try again after some time */
> > schedule_delayed_work(dwork, msecs_to_jiffies(10));
> > return;
> > }
> > }
> >
> > spin_lock_irq(&tg_stats_alloc_lock);
>
> Absolutely!
>
> Something like this perhaps? Did I miss more blkg_[rw]stats? If I read
> the git grep output right, this was the last one.
It changed the error into another one:
/kernel/i386-randconfig-j7-11082318/9d0d532888f6e77970016c0c270ddececfab8f9e
+---------------------------------------------------------+-------+--------------+--------------+--------------+
| | v3.12 | 838cc7b488f8 | d3516a7318f8 | 9d0d532888f6 |
+---------------------------------------------------------+-------+--------------+--------------+--------------+
| boot_successes | 129 | 0 | 0 | 0 |
| boot_failures | 1 | 100 | 100 | 100 |
| BUG:kernel_early_hang_without_any_printk_output | 1 | | | |
| INFO:trying_to_register_non-static_key | 0 | 100 | 100 | |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference_at | 0 | 0 | 0 | 98 |
| Oops:SMP | 0 | 0 | 0 | 100 |
| BUG:unable_to_handle_kernel_paging_request_at | 0 | 0 | 0 | 100 |
| BUG:unable_to_handle_kernel | 0 | 0 | 0 | 2 |
+---------------------------------------------------------+-------+--------------+--------------+--------------+
Here are 3 of the call traces. Attached 1 full dmesg.
dmesg-quantal-ant-3:20131113183320:i386-randconfig-j7-11082318:3.12.0-00187-g9d0d532:1
[ 52.578884] SCSI Media Changer driver v0.25
[ 52.781957] scsi_debug: host protection
[ 52.783001] scsi0 : scsi_debug, version 1.82 [20100324], dev_size_mb=8, opts=0x0
[ 52.846181] BUG: unable to handle kernel NULL pointer dereference at 00000008
[ 52.846293] IP: [<78287084>] lockdep_init_map+0xd/0x544
[ 52.846293] *pde = 00000000
[ 52.846293] Oops: 0002 [#1] SMP
[ 52.846293] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.12.0-00187-g9d0d532 #1
[ 52.846293] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 52.846293] Workqueue: events tg_stats_alloc_fn
[ 52.846293] task: 854f0070 ti: 854f6000 task.ti: 854f6000
[ 52.846293] EIP: 0060:[<78287084>] EFLAGS: 00000296 CPU: 0
[ 52.846293] EIP is at lockdep_init_map+0xd/0x544
[ 52.846293] EAX: 00000004 EBX: 79d614b0 ECX: 79d614b0 EDX: 793fba74
[ 52.846293] ESI: 00000004 EDI: 79d614b8 EBP: 854f7e90 ESP: 854f7e78
[ 52.846293] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 52.846293] CR0: 8005003b CR2: 00000008 CR3: 018a4000 CR4: 000006d0
[ 52.846293] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 52.846293] DR6: 00000000 DR7: 00000000
[ 52.846293] Stack:
[ 52.846293] 0000014a 0000014b 854bd740 00000000 00000000 79d614b8 854f7eac 785fae1d
[ 52.846293] 00000000 795aea60 854bd740 00000000 00000000 854f7ef8 7826bae8 00000000
[ 52.846293] 00000001 00000000 7826ba8f 854a6a00 85bf0700 795aea60 85bef380 795aea60
[ 52.846293] Call Trace:
[ 52.846293] [<785fae1d>] tg_stats_alloc_fn+0xe3/0x155
[ 52.846293] [<7826bae8>] process_one_work+0x1ef/0x349
[ 52.846293] [<7826ba8f>] ? process_one_work+0x196/0x349
[ 52.846293] [<7826c039>] worker_thread+0x1a3/0x274
[ 52.846293] [<7826be96>] ? rescuer_thread+0x233/0x233
[ 52.846293] [<78270649>] kthread+0x8a/0x8f
[ 52.846293] [<78270000>] ? SyS_timer_gettime+0x43/0x9e
[ 52.846293] [<78fbac7b>] ret_from_kernel_thread+0x1b/0x30
[ 52.846293] [<782705bf>] ? __kthread_parkme+0x50/0x50
[ 52.846293] Code: f0 8b 7d e8 64 ff 0d 68 d7 74 79 89 70 10 89 78 14 e9 9b fe ff ff 8d 65 f4 5b 5e 5f 5d c3 55 89 e5 57 56 89 c6 53 89 cb 83 ec 0c <c7> 40 04 00 00 00 00 c7 40 08 00 00 00 00 64 a1 10 d0 74 79 89
[ 52.846293] EIP: [<78287084>] lockdep_init_map+0xd/0x544 SS:ESP 0068:854f7e78
[ 52.846293] CR2: 0000000000000008
[ 52.870492] ---[ end trace cee670421f9807b7 ]---
[ 52.871070] kworker/0:0 (4) used greatest stack depth: 6464 bytes left
dmesg-quantal-ant-3:20131113183450:i386-randconfig-j7-11082318:3.12.0-00187-g9d0d532:1
[ 60.495607] scsi_debug: host protection
[ 60.496526] scsi0 : scsi_debug, version 1.82 [20100324], dev_size_mb=8, opts=0x0
[ 60.549921] scsi 0:0:0:0: Direct-Access Linux scsi_debug 0004 PQ: 0 ANSI: 5
[ 60.574257] BUG: unable to handle kernel NULL pointer dereference at 00000008
[ 60.574284] IP: [<78287084>] lockdep_init_map+0xd/0x544
[ 60.574284] *pde = 00000000
[ 60.574284] Oops: 0002 [#1] SMP
[ 60.574284] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.12.0-00187-g9d0d532 #1
[ 60.574284] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 60.574284] Workqueue: events tg_stats_alloc_fn
[ 60.574284] task: 854f0070 ti: 854f6000 task.ti: 854f6000
[ 60.574284] EIP: 0060:[<78287084>] EFLAGS: 00000296 CPU: 0
[ 60.574284] EIP is at lockdep_init_map+0xd/0x544
[ 60.574284] EAX: 00000004 EBX: 79d614b0 ECX: 79d614b0 EDX: 793fba74
[ 60.574284] ESI: 00000004 EDI: 79d614b8 EBP: 854f7e90 ESP: 854f7e78
[ 60.574284] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 60.574284] CR0: 8005003b CR2: 00000008 CR3: 018a4000 CR4: 000006d0
[ 60.574284] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 60.574284] DR6: 00000000 DR7: 00000000
[ 60.574284] Stack:
[ 60.574284] 0000014a 0000014b 854bd740 00000000 00000000 79d614b8 854f7eac 785fae1d
[ 60.574284] 00000000 795aea60 854bd740 00000000 00000000 854f7ef8 7826bae8 00000000
[ 60.574284] 00000001 00000000 7826ba8f 854a6a00 85bf0700 795aea60 85bef380 795aea60
[ 60.574284] Call Trace:
[ 60.574284] [<785fae1d>] tg_stats_alloc_fn+0xe3/0x155
[ 60.574284] [<7826bae8>] process_one_work+0x1ef/0x349
[ 60.574284] [<7826ba8f>] ? process_one_work+0x196/0x349
[ 60.574284] [<7826c039>] worker_thread+0x1a3/0x274
[ 60.574284] [<7826be96>] ? rescuer_thread+0x233/0x233
[ 60.574284] [<78270649>] kthread+0x8a/0x8f
[ 60.574284] [<78270000>] ? SyS_timer_gettime+0x43/0x9e
[ 60.574284] [<78fbac7b>] ret_from_kernel_thread+0x1b/0x30
[ 60.574284] [<782705bf>] ? __kthread_parkme+0x50/0x50
[ 60.574284] Code: f0 8b 7d e8 64 ff 0d 68 d7 74 79 89 70 10 89 78 14 e9 9b fe ff ff 8d 65 f4 5b 5e 5f 5d c3 55 89 e5 57 56 89 c6 53 89 cb 83 ec 0c <c7> 40 04 00 00 00 00 c7 40 08 00 00 00 00 64 a1 10 d0 74 79 89
[ 60.574284] EIP: [<78287084>] lockdep_init_map+0xd/0x544 SS:ESP 0068:854f7e78
[ 60.574284] CR2: 0000000000000008
[ 60.598000] ---[ end trace 2de24a556554a2aa ]---
[ 60.598976] kworker/0:0 (4) used greatest stack depth: 6464 bytes left
dmesg-quantal-ant-6:20131113183449:i386-randconfig-j7-11082318:3.12.0-00187-g9d0d532:1
[ 54.292005] SCSI Media Changer driver v0.25
[ 54.459617] scsi_debug: host protection
[ 54.460597] scsi0 : scsi_debug, version 1.82 [20100324], dev_size_mb=8, opts=0x0
[ 54.519306] BUG: unable to handle kernel NULL pointer dereference at 00000008
[ 54.519328] IP: [<78287084>] lockdep_init_map+0xd/0x544
[ 54.519328] *pde = 00000000
[ 54.519328] Oops: 0002 [#1] SMP
[ 54.519328] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 3.12.0-00187-g9d0d532 #1
[ 54.519328] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 54.519328] Workqueue: events tg_stats_alloc_fn
[ 54.519328] task: 854f0070 ti: 854f6000 task.ti: 854f6000
[ 54.519328] EIP: 0060:[<78287084>] EFLAGS: 00000296 CPU: 0
[ 54.519328] EIP is at lockdep_init_map+0xd/0x544
[ 54.519328] EAX: 00000004 EBX: 79d614b0 ECX: 79d614b0 EDX: 793fba74
[ 54.519328] ESI: 00000004 EDI: 79d614b8 EBP: 854f7e90 ESP: 854f7e78
[ 54.519328] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
[ 54.519328] CR0: 8005003b CR2: 00000008 CR3: 018a4000 CR4: 000006d0
[ 54.519328] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[ 54.519328] DR6: 00000000 DR7: 00000000
[ 54.519328] Stack:
[ 54.519328] 0000014a 0000014b 854bd740 00000000 00000000 79d614b8 854f7eac 785fae1d
[ 54.519328] 00000000 795aea60 854bd740 00000000 00000000 854f7ef8 7826bae8 00000000
[ 54.519328] 00000001 00000000 7826ba8f 854a6a00 85bf0700 795aea60 85bef380 795aea60
[ 54.519328] Call Trace:
[ 54.519328] [<785fae1d>] tg_stats_alloc_fn+0xe3/0x155
[ 54.519328] [<7826bae8>] process_one_work+0x1ef/0x349
[ 54.519328] [<7826ba8f>] ? process_one_work+0x196/0x349
[ 54.519328] [<7826c039>] worker_thread+0x1a3/0x274
[ 54.519328] [<7826be96>] ? rescuer_thread+0x233/0x233
[ 54.519328] [<78270649>] kthread+0x8a/0x8f
[ 54.519328] [<78270000>] ? SyS_timer_gettime+0x43/0x9e
[ 54.519328] [<78fbac7b>] ret_from_kernel_thread+0x1b/0x30
[ 54.519328] [<782705bf>] ? __kthread_parkme+0x50/0x50
[ 54.519328] Code: f0 8b 7d e8 64 ff 0d 68 d7 74 79 89 70 10 89 78 14 e9 9b fe ff ff 8d 65 f4 5b 5e 5f 5d c3 55 89 e5 57 56 89 c6 53 89 cb 83 ec 0c <c7> 40 04 00 00 00 00 c7 40 08 00 00 00 00 64 a1 10 d0 74 79 89
[ 54.519328] EIP: [<78287084>] lockdep_init_map+0xd/0x544 SS:ESP 0068:854f7e78
[ 54.519328] CR2: 0000000000000008
[ 54.543176] ---[ end trace ddf2d30616f27d7a ]---
[ 54.544356] kworker/0:0 (4) used greatest stack depth: 6464 bytes left
Thanks,
Fengguang
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