Re: [PATCH] drm/mgag200: Fix calling drm_fb_helper_fini() twice

[Archit Taneja]

On 9/17/2015 2:04 PM, Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
>
>
> > So this patch was whitespace damaged - I applied it by hand and made the commit
>
> > below. This has solved the crash, thanks Archit!
>
>
>
> Spoke too soon - the attached (allyesconfig-ish) config still crashes, first there
>
> are a handful of kobject debug warnings, then:

The error handling in the driver is bad. The main problem is that the 
driver_load op calls mgag200_driver_unload if anything fails, which 
doesn't work well if driver_load fails mid way.

I'll post out patches to fix this. But you'll need to undo the patch
I'd sent previously.

Thanks,
Archit

> [  115.274847] [drm:mgag200_mm_init] *ERROR* Failed setting up TTM memory accounting subsystem.
>
> [  115.274853] BUG: unable to handle kernel NULL pointer dereference at           (null)
>
> [  115.274856] IP: [<ffffffff81b88285>] drm_mode_config_cleanup+0x1f/0x1cc
>
> [  115.274858] PGD 0
>
> [  115.274860] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN
>
> [  115.274861] Modules linked in:
>
> [  115.274862] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274863] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274865] Workqueue: events work_for_cpu_fn
>
> [  115.274865] task: ffff88017d2a8000 ti: ffff88017d2b0000 task.ti: ffff88017d2b0000
>
> [  115.274868] RIP: 0010:[<ffffffff81b88285>]  [<ffffffff81b88285>] drm_mode_config_cleanup+0x1f/0x1cc
>
> [  115.274868] RSP: 0000:ffff88017d2b7bd8  EFLAGS: 00010246
>
> [  115.274869] RAX: 0000000000000000 RBX: ffff8800ba0a4520 RCX: ffffffff81186ff1
>
> [  115.274870] RDX: ffff88017d2b7a90 RSI: ffffffff83d73579 RDI: ffff8800ba0a4520
>
> [  115.274870] RBP: ffff88017d2b7bf0 R08: 0000000000000001 R09: 0000000000000000
>
> [  115.274871] R10: 0000000000075000 R11: ffffffff85147a82 R12: ffff8800ba0a4520
>
> [  115.274872] R13: ffff8800ba0a4da8 R14: 00000000fffffffe R15: ffff8800ba0a3400
>
> [  115.274873] FS:  0000000000000000(0000) GS:ffff880420e00000(0000) knlGS:0000000000000000
>
> [  115.274874] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>
> [  115.274875] CR2: 0000000000000000 CR3: 0000000005e2d000 CR4: 00000000001406f0
>
> [  115.274876] Stack:
>
> [  115.274877]  ffff8800ba0a3400 ffff8800ba0a4520 00000000fffffffe ffff88017d2b7c10
>
> [  115.274879]  ffffffff81cb6a3e ffff8800ba0a4520 ffff8800ba0a3400 ffff88017d2b7c78
>
> [  115.274881]  ffffffff81cb6efe 0000072001000000 000000000000aa55 0000075b00000000
>
> [  115.274881] Call Trace:
>
> [  115.274883]  [<ffffffff81cb6a3e>] mgag200_driver_unload+0x30/0x48
>
> [  115.274884]  [<ffffffff81cb6efe>] mgag200_driver_load+0x4a8/0x4ba
>
> [  115.274886]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274887]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274889]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274890]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274891]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274893]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274895]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274897]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
>
>
> Full log is below, config attached as well.
>
>
>
> Thanks,
>
>
>
> 	Ingo
>
>
>
> ========================>
>
> [  115.243547] mgag200 0000:0b:00.0: no default pinctrl state
>
> [  115.243732] devices_kset: Moving 0000:0b:00.0 to end of list
>
> [  115.247078] device: 'controlD64': device_add
>
> [  115.247494] PM: Adding info for No Bus:controlD64
>
> [  115.247979] device: 'card0': device_add
>
> [  115.248315] PM: Adding info for No Bus:card0
>
> [  115.274511] ------------[ cut here ]------------
>
> [  115.274518] WARNING: CPU: 0 PID: 4 at lib/kobject.c:582 kobject_get+0x33/0x6a()
>
> [  115.274519] kobject: 'ttm' (ffffffff86c28700): is not initialized, yet kobject_get() is being called.
>
> [  115.274521] Modules linked in:
>
> [  115.274524] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274525] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274529] Workqueue: events work_for_cpu_fn
>
> [  115.274532]  0000000000000000 ffff88017d2b79a8 ffffffff8188f38b ffff88017d2b79f0
>
> [  115.274534]  ffff88017d2b79e0 ffffffff81144593 ffffffff8189129f ffffffff86c28700
>
> [  115.274536]  0000000000000000 ffffffff86c28700 00000000007f4000 ffff88017d2b7a40
>
> [  115.274537] Call Trace:
>
> [  115.274540]  [<ffffffff8188f38b>] dump_stack+0x4b/0x64
>
> [  115.274543]  [<ffffffff81144593>] warn_slowpath_common+0x9f/0xb8
>
> [  115.274545]  [<ffffffff8189129f>] ? kobject_get+0x33/0x6a
>
> [  115.274547]  [<ffffffff811445f8>] warn_slowpath_fmt+0x4c/0x4e
>
> [  115.274551]  [<ffffffff811892de>] ? lock_is_held+0x55/0x66
>
> [  115.274553]  [<ffffffff8189129f>] kobject_get+0x33/0x6a
>
> [  115.274554]  [<ffffffff81891963>] kobject_add_internal+0x58/0x2c4
>
> [  115.274556]  [<ffffffff81891c42>] kobject_init_and_add+0x73/0x7e
>
> [  115.274559]  [<ffffffff81b981cf>] ttm_mem_global_init+0xc6/0x2cd
>
> [  115.274563]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274564]  [<ffffffff81290029>] ? kasan_unpoison_shadow+0x14/0x35
>
> [  115.274566]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274567]  [<ffffffff81290095>] ? kasan_kmalloc+0x4b/0x50
>
> [  115.274569]  [<ffffffff8128ccdc>] ? __kmalloc+0x13e/0x180
>
> [  115.274571]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274573]  [<ffffffff81b910fc>] ? drm_global_item_ref+0x67/0xad
>
> [  115.274577]  [<ffffffff81cbb766>] mgag200_ttm_mem_global_init+0x12/0x14
>
> [  115.274579]  [<ffffffff81b91113>] drm_global_item_ref+0x7e/0xad
>
> [  115.274581]  [<ffffffff81cbb82d>] mgag200_mm_init+0x50/0x199
>
> [  115.274583]  [<ffffffff81cb6da0>] mgag200_driver_load+0x34a/0x4ba
>
> [  115.274587]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274589]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274590]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274593]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274595]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274597]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274599]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274601]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
> [  115.274603]  [<ffffffff8115c3f1>] worker_thread+0x1fb/0x2bd
>
> [  115.274605]  [<ffffffff8115c1f6>] ? process_scheduled_works+0x2f/0x2f
>
> [  115.274607]  [<ffffffff8116185b>] kthread+0xc5/0xcd
>
> [  115.274609]  [<ffffffff8118992e>] ? lock_release+0x3a5/0x3f8
>
> [  115.274611]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274615]  [<ffffffff83d741af>] ret_from_fork+0x3f/0x70
>
> [  115.274616]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274618] ---[ end trace 3d275ea9d9277b89 ]---
>
> [  115.274619] ------------[ cut here ]------------
>
> [  115.274621] WARNING: CPU: 0 PID: 4 at include/linux/kref.h:47 kobject_get+0x5d/0x6a()
>
> [  115.274622] Modules linked in:
>
> [  115.274623] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274624] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274626] Workqueue: events work_for_cpu_fn
>
> [  115.274628]  0000000000000000 ffff88017d2b79f8 ffffffff8188f38b 0000000000000000
>
> [  115.274630]  ffff88017d2b7a30 ffffffff81144593 ffffffff818912c9 ffffffff86c28700
>
> [  115.274632]  0000000000000000 ffffffff86c28700 00000000007f4000 ffff88017d2b7a40
>
> [  115.274632] Call Trace:
>
> [  115.274634]  [<ffffffff8188f38b>] dump_stack+0x4b/0x64
>
> [  115.274635]  [<ffffffff81144593>] warn_slowpath_common+0x9f/0xb8
>
> [  115.274637]  [<ffffffff818912c9>] ? kobject_get+0x5d/0x6a
>
> [  115.274638]  [<ffffffff8114465a>] warn_slowpath_null+0x1a/0x1c
>
> [  115.274640]  [<ffffffff818912c9>] kobject_get+0x5d/0x6a
>
> [  115.274641]  [<ffffffff81891963>] kobject_add_internal+0x58/0x2c4
>
> [  115.274642]  [<ffffffff81891c42>] kobject_init_and_add+0x73/0x7e
>
> [  115.274644]  [<ffffffff81b981cf>] ttm_mem_global_init+0xc6/0x2cd
>
> [  115.274645]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274647]  [<ffffffff81290029>] ? kasan_unpoison_shadow+0x14/0x35
>
> [  115.274648]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274650]  [<ffffffff81290095>] ? kasan_kmalloc+0x4b/0x50
>
> [  115.274651]  [<ffffffff8128ccdc>] ? __kmalloc+0x13e/0x180
>
> [  115.274652]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274654]  [<ffffffff81b910fc>] ? drm_global_item_ref+0x67/0xad
>
> [  115.274655]  [<ffffffff81cbb766>] mgag200_ttm_mem_global_init+0x12/0x14
>
> [  115.274657]  [<ffffffff81b91113>] drm_global_item_ref+0x7e/0xad
>
> [  115.274658]  [<ffffffff81cbb82d>] mgag200_mm_init+0x50/0x199
>
> [  115.274660]  [<ffffffff81cb6da0>] mgag200_driver_load+0x34a/0x4ba
>
> [  115.274662]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274663]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274665]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274666]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274668]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274669]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274671]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274673]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
> [  115.274675]  [<ffffffff8115c3f1>] worker_thread+0x1fb/0x2bd
>
> [  115.274676]  [<ffffffff8115c1f6>] ? process_scheduled_works+0x2f/0x2f
>
> [  115.274678]  [<ffffffff8116185b>] kthread+0xc5/0xcd
>
> [  115.274679]  [<ffffffff8118992e>] ? lock_release+0x3a5/0x3f8
>
> [  115.274681]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274683]  [<ffffffff83d741af>] ret_from_fork+0x3f/0x70
>
> [  115.274684]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274685] ---[ end trace 3d275ea9d9277b8a ]---
>
> [  115.274686] ------------[ cut here ]------------
>
> [  115.274688] WARNING: CPU: 0 PID: 4 at lib/kobject.c:674 kobject_put+0x33/0x47()
>
> [  115.274689] kobject: 'ttm' (ffffffff86c28700): is not initialized, yet kobject_put() is being called.
>
> [  115.274690] Modules linked in:
>
> [  115.274691] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274691] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274693] Workqueue: events work_for_cpu_fn
>
> [  115.274695]  0000000000000000 ffff88017d2b79a8 ffffffff8188f38b ffff88017d2b79f0
>
> [  115.274697]  ffff88017d2b79e0 ffffffff81144593 ffffffff81891309 ffffffff86c28700
>
> [  115.274699]  ffffffff86c28700 00000000fffffffe 00000000007f4000 ffff88017d2b7a40
>
> [  115.274700] Call Trace:
>
> [  115.274701]  [<ffffffff8188f38b>] dump_stack+0x4b/0x64
>
> [  115.274703]  [<ffffffff81144593>] warn_slowpath_common+0x9f/0xb8
>
> [  115.274705]  [<ffffffff81891309>] ? kobject_put+0x33/0x47
>
> [  115.274706]  [<ffffffff811445f8>] warn_slowpath_fmt+0x4c/0x4e
>
> [  115.274708]  [<ffffffff81891309>] kobject_put+0x33/0x47
>
> [  115.274710]  [<ffffffff81891ba6>] kobject_add_internal+0x29b/0x2c4
>
> [  115.274711]  [<ffffffff81891c42>] kobject_init_and_add+0x73/0x7e
>
> [  115.274712]  [<ffffffff81b981cf>] ttm_mem_global_init+0xc6/0x2cd
>
> [  115.274714]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274715]  [<ffffffff81290029>] ? kasan_unpoison_shadow+0x14/0x35
>
> [  115.274717]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274718]  [<ffffffff81290095>] ? kasan_kmalloc+0x4b/0x50
>
> [  115.274719]  [<ffffffff8128ccdc>] ? __kmalloc+0x13e/0x180
>
> [  115.274721]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274722]  [<ffffffff81b910fc>] ? drm_global_item_ref+0x67/0xad
>
> [  115.274724]  [<ffffffff81cbb766>] mgag200_ttm_mem_global_init+0x12/0x14
>
> [  115.274725]  [<ffffffff81b91113>] drm_global_item_ref+0x7e/0xad
>
> [  115.274727]  [<ffffffff81cbb82d>] mgag200_mm_init+0x50/0x199
>
> [  115.274728]  [<ffffffff81cb6da0>] mgag200_driver_load+0x34a/0x4ba
>
> [  115.274730]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274731]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274733]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274734]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274736]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274737]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274739]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274741]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
> [  115.274743]  [<ffffffff8115c3f1>] worker_thread+0x1fb/0x2bd
>
> [  115.274745]  [<ffffffff8115c1f6>] ? process_scheduled_works+0x2f/0x2f
>
> [  115.274746]  [<ffffffff8116185b>] kthread+0xc5/0xcd
>
> [  115.274747]  [<ffffffff8118992e>] ? lock_release+0x3a5/0x3f8
>
> [  115.274749]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274751]  [<ffffffff83d741af>] ret_from_fork+0x3f/0x70
>
> [  115.274752]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274753] ---[ end trace 3d275ea9d9277b8b ]---
>
> [  115.274763] ------------[ cut here ]------------
>
> [  115.274764] WARNING: CPU: 0 PID: 4 at lib/kobject.c:244 kobject_add_internal+0x281/0x2c4()
>
> [  115.274765] kobject_add_internal failed for memory_accounting (error: -2 parent: kkkkkkkïïïïïïïïïï
>
> [  115.274765] ïïïïïïïïïïïVï(ïïïïïbï(ïïïïïïÈïïïïïïïïïïïïïïÛïïïïVïRïïïïïï!)
>
> [  115.274766] Modules linked in:
>
> [  115.274767] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274768] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274769] Workqueue: events work_for_cpu_fn
>
> [  115.274771]  0000000000000000 ffff88017d2b79c0 ffffffff8188f38b ffff88017d2b7a08
>
> [  115.274773]  ffff88017d2b79f8 ffffffff81144593 ffffffff81891b8c ffff88041821e270
>
> [  115.274775]  ffffffff86c28700 00000000fffffffe 00000000007f4000 ffff88017d2b7a58
>
> [  115.274776] Call Trace:
>
> [  115.274777]  [<ffffffff8188f38b>] dump_stack+0x4b/0x64
>
> [  115.274779]  [<ffffffff81144593>] warn_slowpath_common+0x9f/0xb8
>
> [  115.274780]  [<ffffffff81891b8c>] ? kobject_add_internal+0x281/0x2c4
>
> [  115.274781]  [<ffffffff811445f8>] warn_slowpath_fmt+0x4c/0x4e
>
> [  115.274782]  [<ffffffff81891b8c>] kobject_add_internal+0x281/0x2c4
>
> [  115.274784]  [<ffffffff81891c42>] kobject_init_and_add+0x73/0x7e
>
> [  115.274785]  [<ffffffff81b981cf>] ttm_mem_global_init+0xc6/0x2cd
>
> [  115.274787]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274788]  [<ffffffff81290029>] ? kasan_unpoison_shadow+0x14/0x35
>
> [  115.274790]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274792]  [<ffffffff81290095>] ? kasan_kmalloc+0x4b/0x50
>
> [  115.274793]  [<ffffffff8128ccdc>] ? __kmalloc+0x13e/0x180
>
> [  115.274795]  [<ffffffff8128f809>] ? kasan_poison_shadow+0x2f/0x31
>
> [  115.274796]  [<ffffffff81b910fc>] ? drm_global_item_ref+0x67/0xad
>
> [  115.274798]  [<ffffffff81cbb766>] mgag200_ttm_mem_global_init+0x12/0x14
>
> [  115.274799]  [<ffffffff81b91113>] drm_global_item_ref+0x7e/0xad
>
> [  115.274801]  [<ffffffff81cbb82d>] mgag200_mm_init+0x50/0x199
>
> [  115.274803]  [<ffffffff81cb6da0>] mgag200_driver_load+0x34a/0x4ba
>
> [  115.274805]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274806]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274808]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274809]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274810]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274812]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274814]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274816]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
> [  115.274817]  [<ffffffff8115c3f1>] worker_thread+0x1fb/0x2bd
>
> [  115.274819]  [<ffffffff8115c1f6>] ? process_scheduled_works+0x2f/0x2f
>
> [  115.274820]  [<ffffffff8116185b>] kthread+0xc5/0xcd
>
> [  115.274822]  [<ffffffff8118992e>] ? lock_release+0x3a5/0x3f8
>
> [  115.274824]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274825]  [<ffffffff83d741af>] ret_from_fork+0x3f/0x70
>
> [  115.274827]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274828] ---[ end trace 3d275ea9d9277b8c ]---
>
> [  115.274847] [drm:mgag200_mm_init] *ERROR* Failed setting up TTM memory accounting subsystem.
>
> [  115.274853] BUG: unable to handle kernel NULL pointer dereference at           (null)
>
> [  115.274856] IP: [<ffffffff81b88285>] drm_mode_config_cleanup+0x1f/0x1cc
>
> [  115.274858] PGD 0
>
> [  115.274860] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN
>
> [  115.274861] Modules linked in:
>
> [  115.274862] CPU: 0 PID: 4 Comm: kworker/0:0 Tainted: G        W    L  4.3.0-rc1-01729-g525850e-dirty #59
>
> [  115.274863] Hardware name: Intel Corporation S2600GZ/S2600GZ, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
>
> [  115.274865] Workqueue: events work_for_cpu_fn
>
> [  115.274865] task: ffff88017d2a8000 ti: ffff88017d2b0000 task.ti: ffff88017d2b0000
>
> [  115.274868] RIP: 0010:[<ffffffff81b88285>]  [<ffffffff81b88285>] drm_mode_config_cleanup+0x1f/0x1cc
>
> [  115.274868] RSP: 0000:ffff88017d2b7bd8  EFLAGS: 00010246
>
> [  115.274869] RAX: 0000000000000000 RBX: ffff8800ba0a4520 RCX: ffffffff81186ff1
>
> [  115.274870] RDX: ffff88017d2b7a90 RSI: ffffffff83d73579 RDI: ffff8800ba0a4520
>
> [  115.274870] RBP: ffff88017d2b7bf0 R08: 0000000000000001 R09: 0000000000000000
>
> [  115.274871] R10: 0000000000075000 R11: ffffffff85147a82 R12: ffff8800ba0a4520
>
> [  115.274872] R13: ffff8800ba0a4da8 R14: 00000000fffffffe R15: ffff8800ba0a3400
>
> [  115.274873] FS:  0000000000000000(0000) GS:ffff880420e00000(0000) knlGS:0000000000000000
>
> [  115.274874] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>
> [  115.274875] CR2: 0000000000000000 CR3: 0000000005e2d000 CR4: 00000000001406f0
>
> [  115.274876] Stack:
>
> [  115.274877]  ffff8800ba0a3400 ffff8800ba0a4520 00000000fffffffe ffff88017d2b7c10
>
> [  115.274879]  ffffffff81cb6a3e ffff8800ba0a4520 ffff8800ba0a3400 ffff88017d2b7c78
>
> [  115.274881]  ffffffff81cb6efe 0000072001000000 000000000000aa55 0000075b00000000
>
> [  115.274881] Call Trace:
>
> [  115.274883]  [<ffffffff81cb6a3e>] mgag200_driver_unload+0x30/0x48
>
> [  115.274884]  [<ffffffff81cb6efe>] mgag200_driver_load+0x4a8/0x4ba
>
> [  115.274886]  [<ffffffff81b80055>] drm_dev_register+0x6f/0xb0
>
> [  115.274887]  [<ffffffff81b82865>] drm_get_pci_dev+0xff/0x1c2
>
> [  115.274889]  [<ffffffff81cbaaed>] mga_pci_probe+0xa6/0xad
>
> [  115.274890]  [<ffffffff8190e877>] local_pci_probe+0x3d/0x82
>
> [  115.274891]  [<ffffffff81158451>] work_for_cpu_fn+0x14/0x1b
>
> [  115.274893]  [<ffffffff8115bf66>] process_one_work+0x28e/0x4ef
>
> [  115.274895]  [<ffffffff8115be48>] ? process_one_work+0x170/0x4ef
>
> [  115.274897]  [<ffffffff8115c1e8>] process_scheduled_works+0x21/0x2f
>
> [  115.274898]  [<ffffffff8115c3f1>] worker_thread+0x1fb/0x2bd
>
> [  115.274901]  [<ffffffff8115c1f6>] ? process_scheduled_works+0x2f/0x2f
>
> [  115.274902]  [<ffffffff8116185b>] kthread+0xc5/0xcd
>
> [  115.274904]  [<ffffffff8118992e>] ? lock_release+0x3a5/0x3f8
>
> [  115.274906]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274908]  [<ffffffff83d741af>] ret_from_fork+0x3f/0x70
>
> [  115.274910]  [<ffffffff81161796>] ? kthread_parkme+0x24/0x24
>
> [  115.274928] Code: 00 49 83 c0 28 e8 c9 fd ff ff 5d c3 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 53 48 8b 87 88 08 00 00 48 89 fb 4c 8d ab 88 08 00 00 <4c> 8b 20 48 8d 78 f8 49 83 ec 08 eb 13 48 8b 47 50 ff 50 08 49
>
> [  115.274930] RIP  [<ffffffff81b88285>] drm_mode_config_cleanup+0x1f/0x1cc
>
> [  115.274931]  RSP <ffff88017d2b7bd8>
>
> [  115.274932] CR2: 0000000000000000
>
> [  115.274934] ---[ end trace 3d275ea9d9277b8d ]---
>
> [  115.284475] kworker/0:0 (4) used greatest stack depth: 29320 bytes left
>
> [  115.284480] BUG: unable to handle kernel paging request at ffffffffffffff98
>
> [  115.284483] IP: [<ffffffff81161a7d>] kthread_data+0x10/0x16
>
> [  115.284484] PGD 5e30067 PUD 5e32067 PMD 0
>
> [  115.284486] Oops: 0000 [#2] SMP DEBUG_PAGEALLOC KASAN

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/