Re: [Intel-gfx] [PATCH] drm/i915: fix blank screen booting crashes

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On Fri, 15 Oct 2021, John Harrison <john.c.harrison@xxxxxxxxx> wrote:
> On 10/15/2021 07:52, Tvrtko Ursulin wrote:
>> On 04/10/2021 08:36, Jani Nikula wrote:
>>> On Fri, 24 Sep 2021, Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> 
>>> wrote:
>>>> On Tue, Sep 21, 2021 at 06:50:39PM -0700, Matthew Brost wrote:
>>>>> From: Hugh Dickins <hughd@xxxxxxxxxx>
>>>>>
>>>>> 5.15-rc1 crashes with blank screen when booting up on two ThinkPads
>>>>> using i915.  Bisections converge convincingly, but arrive at different
>>>>> and surprising "culprits", none of them the actual culprit.
>>>>>
>>>>> netconsole (with init_netconsole() hacked to call i915_init() when
>>>>> logging has started, instead of by module_init()) tells the story:
>>>>>
>>>>> kernel BUG at drivers/gpu/drm/i915/i915_sw_fence.c:245!
>>>>> with RSI: ffffffff814d408b pointing to sw_fence_dummy_notify().
>>>>> I've been building with CONFIG_CC_OPTIMIZE_FOR_SIZE=y, and that
>>>>> function needs to be 4-byte aligned.
>>>>>
>>>>> v2:
>>>>>   (Jani Nikula)
>>>>>    - Change BUG_ON to WARN_ON
>>>>> v3:
>>>>>   (Jani / Tvrtko)
>>>>>    - Short circuit __i915_sw_fence_init on WARN_ON
>>>>> v4:
>>>>>   (Lucas)
>>>>>    - Break WARN_ON changes out in a different patch
>>>>>
>>>>> Fixes: 62eaf0ae217d ("drm/i915/guc: Support request cancellation")
>>>>> Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
>>>>> Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
>>>>> Reviewed-by: Matthew Brost <matthew.brost@xxxxxxxxx>
>>>>> ---
>>>>>   drivers/gpu/drm/i915/gt/intel_context.c | 4 ++--
>>>>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/i915/gt/intel_context.c 
>>>>> b/drivers/gpu/drm/i915/gt/intel_context.c
>>>>> index ff637147b1a9..e7f78bc7ebfc 100644
>>>>> --- a/drivers/gpu/drm/i915/gt/intel_context.c
>>>>> +++ b/drivers/gpu/drm/i915/gt/intel_context.c
>>>>> @@ -362,8 +362,8 @@ static int __intel_context_active(struct 
>>>>> i915_active *active)
>>>>>       return 0;
>>>>>   }
>>>>>   -static int sw_fence_dummy_notify(struct i915_sw_fence *sf,
>>>>> -                 enum i915_sw_fence_notify state)
>>>>> +static int __i915_sw_fence_call
>>>>> +sw_fence_dummy_notify(struct i915_sw_fence *sf, enum 
>>>>> i915_sw_fence_notify state)
>>>>>   {
>>>>>       return NOTIFY_DONE;
>>>>>   }
>>>>
>>>> This thing seems broken beyond just this alignment stuff. I'm getting
>>>> this spew from DEBUG_OBJECTS all the time on a glk here:
>>>
>>> Nobody followed through with this, so:
>>>
>>> https://lore.kernel.org/r/20211002020257.34a0e882@xxxxxxxxxxxxxxxx
>>>
>>> and
>>>
>>> cdc1e6e225e3 ("drm/i915: fix blank screen booting crashes")
>>
>> John you pushed this yesterday? Will this cause a problem now if we 
>> have two commits for the same bug:
> I'm thoroughly confused.
>
> I finally got far enough down my backlog to reach this and it did not 
> appear to be in the tree yet so I tried pushing it. The DIM tool gave me 
> a bunch of errors that didn't seem to make any sense. It certainly gave 
> me the impression that it did not actually do anything. So I gave up on 
> it. But now it seems like it did actually push something? And it was 
> already merged after all?

Linus merged it directly to his tree because we didn't follow through
with this soon enough. Linus' tree feeds to drm-tip via drm-intel-fixes,
but I guess we haven't done backmerges from Linux' tree to drm-next to
drm-intel-gt-next with that commit. Once you applied the patch, dim
rebuilt drm-tip, which now got the same change from both drm-intel-fixes
and drm-intel-gt-next.

It happens.

But in general, if there are regressions with blank screens at boot
occurring in Linus' tree, the fix needs to move much faster.

BR,
Jani.


>
> John.
>
>>
>> commit b0179f0d18dd7e6fb6b1c52c49ac21365257e97e
>> Author:     Hugh Dickins <hughd@xxxxxxxxxx>
>> AuthorDate: Tue Sep 21 18:50:39 2021 -0700
>> Commit:     John Harrison <John.C.Harrison@xxxxxxxxx>
>> CommitDate: Thu Oct 14 18:29:01 2021 -0700
>>
>>     drm/i915: fix blank screen booting crashes
>>
>>
>>
>> commit cdc1e6e225e3256d56dc6648411630e71d7c776b
>> Author:     Hugh Dickins <hughd@xxxxxxxxxx>
>> AuthorDate: Sat Oct 2 03:17:29 2021 -0700
>> Commit:     Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
>> CommitDate: Sat Oct 2 09:39:15 2021 -0700
>>
>>     drm/i915: fix blank screen booting crashes
>>
>> Regards,
>>
>> Tvrtko
>>
>>>
>>>
>>> BR,
>>> Jani.
>>>
>>>
>>>>
>>>> [   48.122629] ------------[ cut here ]------------
>>>> [   48.122640] ODEBUG: init destroyed (active state 0) object type: 
>>>> i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x10 [i915]
>>>> [   48.122963] WARNING: CPU: 0 PID: 815 at lib/debugobjects.c:505 
>>>> debug_print_object+0x6e/0x90
>>>> [   48.122976] Modules linked in: i915 i2c_algo_bit ttm 
>>>> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops 
>>>> prime_numbers intel_gtt agpgart fuse nls_iso8859_1 nls_cp437 vfat 
>>>> fat intel_rapl_msr wmi_bmof intel_rapl_common x86_pkg_temp_thermal 
>>>> r8169 realtek mdio_devres coretemp libphy efi_pstore evdev sdhci_pci 
>>>> cqhci sdhci mei_me mmc_core i2c_i801 intel_pmc_core mei led_class 
>>>> wmi i2c_smbus sch_fq_codel drm ip_tables x_tables ipv6 autofs4
>>>> [   48.123119] CPU: 0 PID: 815 Comm: kms_async_flips Not tainted 
>>>> 5.15.0-rc2-hsw+ #131
>>>> [   48.123125] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, 
>>>> BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
>>>> [   48.123129] RIP: 0010:debug_print_object+0x6e/0x90
>>>> [   48.123137] Code: 07 08 02 83 c0 01 8b 4b 14 4c 8b 45 00 48 c7 c7 
>>>> a0 19 0a 82 89 05 66 07 08 02 8b 43 10 48 8b 14 c5 c0 0d e4 81 e8 d7 
>>>> 2e 3c 00 <0f> 0b 83 05 c5 c0 0c 01 01 48 83 c4 08 5b 5d c3 83 05 b7 
>>>> c0 0c 01
>>>> [   48.123142] RSP: 0018:ffffc90000dabae0 EFLAGS: 00010282
>>>> [   48.123150] RAX: 0000000000000000 RBX: ffff88810004f848 RCX: 
>>>> 0000000000000000
>>>> [   48.123154] RDX: 0000000080000001 RSI: ffffffff8112673f RDI: 
>>>> ffffffff8112673f
>>>> [   48.123159] RBP: ffffffffa0577480 R08: ffff88827fbfcfe8 R09: 
>>>> 000000000009fffb
>>>> [   48.123163] R10: 00000000fffe0000 R11: 3fffffffffffffff R12: 
>>>> ffff88810a04d100
>>>> [   48.123167] R13: ffff88810a07d308 R14: ffff888109990800 R15: 
>>>> ffff88810997b800
>>>> [   48.123171] FS:  00007ffff624b9c0(0000) GS:ffff888276e00000(0000) 
>>>> knlGS:0000000000000000
>>>> [   48.123176] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [   48.123181] CR2: 00007ffff7f93bf0 CR3: 0000000108e56000 CR4: 
>>>> 0000000000350ef0
>>>> [   48.123185] Call Trace:
>>>> [   48.123190]  i915_sw_fence_reinit+0x15/0x40 [i915]
>>>> [   48.123341]  intel_context_init+0x16b/0x1d0 [i915]
>>>> [   48.123492]  intel_context_create+0x33/0x100 [i915]
>>>> [   48.123642]  default_engines+0x9d/0x120 [i915]
>>>> [   48.123806]  i915_gem_create_context+0x465/0x630 [i915]
>>>> [   48.125964]  ? trace_kmalloc+0x29/0xd0
>>>> [   48.125976]  ? kmem_cache_alloc_trace+0x121/0x620
>>>> [   48.125984]  i915_gem_context_open+0x145/0x1d0 [i915]
>>>> [   48.126172]  i915_gem_open+0x75/0xb0 [i915]
>>>> [   48.126364]  drm_file_alloc+0x1b1/0x280 [drm]
>>>> [   48.126427]  drm_open+0xde/0x250 [drm]
>>>> [   48.126482]  drm_stub_open+0xa8/0x130 [drm]
>>>> [   48.126538]  chrdev_open+0xbf/0x240
>>>> [   48.126547]  ? cdev_device_add+0x90/0x90
>>>> [   48.126553]  do_dentry_open+0x151/0x3a0
>>>> [   48.126560]  path_openat+0x76f/0xa10
>>>> [   48.126568]  do_filp_open+0xa9/0x150
>>>> [   48.126575]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.126584]  ? _raw_spin_unlock+0x29/0x40
>>>> [   48.126593]  do_sys_openat2+0x97/0x160
>>>> [   48.126600]  __x64_sys_openat+0x54/0x90
>>>> [   48.126607]  do_syscall_64+0x38/0x90
>>>> [   48.126614]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>>> [   48.126622] RIP: 0033:0x7ffff7cdca5b
>>>> [   48.126630] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 
>>>> 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 
>>>> 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 
>>>> 33 0c 25
>>>> [   48.126636] RSP: 002b:00007fffffffda20 EFLAGS: 00000246 ORIG_RAX: 
>>>> 0000000000000101
>>>> [   48.126645] RAX: ffffffffffffffda RBX: 00007fffffffdb60 RCX: 
>>>> 00007ffff7cdca5b
>>>> [   48.126649] RDX: 0000000000000002 RSI: 00007fffffffdb60 RDI: 
>>>> 00000000ffffff9c
>>>> [   48.126654] RBP: 00007fffffffdb60 R08: 0000000000000001 R09: 
>>>> 000000000000000e
>>>> [   48.126658] R10: 0000000000000000 R11: 0000000000000246 R12: 
>>>> 0000000000000002
>>>> [   48.126663] R13: 00007ffff7f9406a R14: 0000000000000000 R15: 
>>>> 00000000fffffffb
>>>> [   48.126669] irq event stamp: 29565
>>>> [   48.126673] hardirqs last  enabled at (29571): 
>>>> [<ffffffff81126357>] __up_console_sem+0x67/0x70
>>>> [   48.126682] hardirqs last disabled at (29576): 
>>>> [<ffffffff8112633c>] __up_console_sem+0x4c/0x70
>>>> [   48.126689] softirqs last  enabled at (29394): 
>>>> [<ffffffff81c0032c>] __do_softirq+0x32c/0x499
>>>> [   48.126696] softirqs last disabled at (29371): 
>>>> [<ffffffff810ba2ed>] irq_exit_rcu+0xdd/0x130
>>>> [   48.126704] ---[ end trace 4978f2ce56481e4b ]---
>>>> [   48.126711] ------------[ cut here ]------------
>>>> [   48.126714] ODEBUG: activate destroyed (active state 0) object 
>>>> type: i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x10 [i915]
>>>> [   48.127053] WARNING: CPU: 1 PID: 815 at lib/debugobjects.c:505 
>>>> debug_print_object+0x6e/0x90
>>>> [   48.127062] Modules linked in: i915 i2c_algo_bit ttm 
>>>> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops 
>>>> prime_numbers intel_gtt agpgart fuse nls_iso8859_1 nls_cp437 vfat 
>>>> fat intel_rapl_msr wmi_bmof intel_rapl_common x86_pkg_temp_thermal 
>>>> r8169 realtek mdio_devres coretemp libphy efi_pstore evdev sdhci_pci 
>>>> cqhci sdhci mei_me mmc_core i2c_i801 intel_pmc_core mei led_class 
>>>> wmi i2c_smbus sch_fq_codel drm ip_tables x_tables ipv6 autofs4
>>>> [   48.127216] CPU: 1 PID: 815 Comm: kms_async_flips Tainted: 
>>>> G        W         5.15.0-rc2-hsw+ #131
>>>> [   48.127221] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, 
>>>> BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
>>>> [   48.127226] RIP: 0010:debug_print_object+0x6e/0x90
>>>> [   48.127232] Code: 07 08 02 83 c0 01 8b 4b 14 4c 8b 45 00 48 c7 c7 
>>>> a0 19 0a 82 89 05 66 07 08 02 8b 43 10 48 8b 14 c5 c0 0d e4 81 e8 d7 
>>>> 2e 3c 00 <0f> 0b 83 05 c5 c0 0c 01 01 48 83 c4 08 5b 5d c3 83 05 b7 
>>>> c0 0c 01
>>>> [   48.127238] RSP: 0018:ffffc90000daba88 EFLAGS: 00010282
>>>> [   48.127245] RAX: 0000000000000000 RBX: ffff88810004f848 RCX: 
>>>> 0000000000000000
>>>> [   48.127250] RDX: 0000000080000001 RSI: ffffffff8112673f RDI: 
>>>> ffffffff8112673f
>>>> [   48.127254] RBP: ffffffffa0577480 R08: ffff88827fbfcfe8 R09: 
>>>> 000000000009fffb
>>>> [   48.127259] R10: 00000000fffe0000 R11: 3fffffffffffffff R12: 
>>>> ffff88810a04d468
>>>> [   48.127263] R13: ffffffffa0577480 R14: ffffffff835ce0b8 R15: 
>>>> ffff88810997b800
>>>> [   48.127268] FS:  00007ffff624b9c0(0000) GS:ffff888276e80000(0000) 
>>>> knlGS:0000000000000000
>>>> [   48.127273] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [   48.127277] CR2: 000055555556f5e8 CR3: 0000000108e56000 CR4: 
>>>> 0000000000350ee0
>>>> [   48.127282] Call Trace:
>>>> [   48.127287]  debug_object_activate+0x174/0x200
>>>> [   48.127296]  i915_sw_fence_commit+0x15/0x20 [i915]
>>>> [   48.127461]  intel_context_init+0x173/0x1d0 [i915]
>>>> [   48.127627]  intel_context_create+0x33/0x100 [i915]
>>>> [   48.127792]  default_engines+0x9d/0x120 [i915]
>>>> [   48.127971]  i915_gem_create_context+0x465/0x630 [i915]
>>>> [   48.128195]  ? trace_kmalloc+0x29/0xd0
>>>> [   48.128203]  ? kmem_cache_alloc_trace+0x121/0x620
>>>> [   48.128211]  i915_gem_context_open+0x145/0x1d0 [i915]
>>>> [   48.128389]  i915_gem_open+0x75/0xb0 [i915]
>>>> [   48.128577]  drm_file_alloc+0x1b1/0x280 [drm]
>>>> [   48.128632]  drm_open+0xde/0x250 [drm]
>>>> [   48.128687]  drm_stub_open+0xa8/0x130 [drm]
>>>> [   48.128742]  chrdev_open+0xbf/0x240
>>>> [   48.128749]  ? cdev_device_add+0x90/0x90
>>>> [   48.128754]  do_dentry_open+0x151/0x3a0
>>>> [   48.128761]  path_openat+0x76f/0xa10
>>>> [   48.128768]  do_filp_open+0xa9/0x150
>>>> [   48.128775]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.128782]  ? _raw_spin_unlock+0x29/0x40
>>>> [   48.128789]  do_sys_openat2+0x97/0x160
>>>> [   48.128795]  __x64_sys_openat+0x54/0x90
>>>> [   48.128802]  do_syscall_64+0x38/0x90
>>>> [   48.128808]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>>> [   48.128815] RIP: 0033:0x7ffff7cdca5b
>>>> [   48.128821] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 
>>>> 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 
>>>> 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 
>>>> 33 0c 25
>>>> [   48.128826] RSP: 002b:00007fffffffda20 EFLAGS: 00000246 ORIG_RAX: 
>>>> 0000000000000101
>>>> [   48.128835] RAX: ffffffffffffffda RBX: 00007fffffffdb60 RCX: 
>>>> 00007ffff7cdca5b
>>>> [   48.128839] RDX: 0000000000000002 RSI: 00007fffffffdb60 RDI: 
>>>> 00000000ffffff9c
>>>> [   48.128844] RBP: 00007fffffffdb60 R08: 0000000000000001 R09: 
>>>> 000000000000000e
>>>> [   48.128848] R10: 0000000000000000 R11: 0000000000000246 R12: 
>>>> 0000000000000002
>>>> [   48.128852] R13: 00007ffff7f9406a R14: 0000000000000000 R15: 
>>>> 00000000fffffffb
>>>> [   48.128859] irq event stamp: 30217
>>>> [   48.128862] hardirqs last  enabled at (30223): 
>>>> [<ffffffff81126357>] __up_console_sem+0x67/0x70
>>>> [   48.128869] hardirqs last disabled at (30228): 
>>>> [<ffffffff8112633c>] __up_console_sem+0x4c/0x70
>>>> [   48.128875] softirqs last  enabled at (30050): 
>>>> [<ffffffff81c0032c>] __do_softirq+0x32c/0x499
>>>> [   48.128881] softirqs last disabled at (30035): 
>>>> [<ffffffff810ba2ed>] irq_exit_rcu+0xdd/0x130
>>>> [   48.128888] ---[ end trace 4978f2ce56481e4c ]---
>>>> [   48.128895] ------------[ cut here ]------------
>>>> [   48.128899] ODEBUG: active_state destroyed (active state 0) 
>>>> object type: i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x10 [i915]
>>>> [   48.129179] WARNING: CPU: 1 PID: 815 at lib/debugobjects.c:505 
>>>> debug_print_object+0x6e/0x90
>>>> [   48.129187] Modules linked in: i915 i2c_algo_bit ttm 
>>>> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops 
>>>> prime_numbers intel_gtt agpgart fuse nls_iso8859_1 nls_cp437 vfat 
>>>> fat intel_rapl_msr wmi_bmof intel_rapl_common x86_pkg_temp_thermal 
>>>> r8169 realtek mdio_devres coretemp libphy efi_pstore evdev sdhci_pci 
>>>> cqhci sdhci mei_me mmc_core i2c_i801 intel_pmc_core mei led_class 
>>>> wmi i2c_smbus sch_fq_codel drm ip_tables x_tables ipv6 autofs4
>>>> [   48.129328] CPU: 1 PID: 815 Comm: kms_async_flips Tainted: 
>>>> G        W         5.15.0-rc2-hsw+ #131
>>>> [   48.129334] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, 
>>>> BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
>>>> [   48.129338] RIP: 0010:debug_print_object+0x6e/0x90
>>>> [   48.129344] Code: 07 08 02 83 c0 01 8b 4b 14 4c 8b 45 00 48 c7 c7 
>>>> a0 19 0a 82 89 05 66 07 08 02 8b 43 10 48 8b 14 c5 c0 0d e4 81 e8 d7 
>>>> 2e 3c 00 <0f> 0b 83 05 c5 c0 0c 01 01 48 83 c4 08 5b 5d c3 83 05 b7 
>>>> c0 0c 01
>>>> [   48.129350] RSP: 0018:ffffc90000dabaa8 EFLAGS: 00010286
>>>> [   48.129357] RAX: 0000000000000000 RBX: ffff88810004f848 RCX: 
>>>> 0000000000000000
>>>> [   48.129362] RDX: 0000000080000001 RSI: ffffffff8112673f RDI: 
>>>> ffffffff8112673f
>>>> [   48.129366] RBP: ffffffffa0577480 R08: ffff88827fbfcfe8 R09: 
>>>> 000000000009fffb
>>>> [   48.129371] R10: 00000000fffe0000 R11: 3fffffffffffffff R12: 
>>>> ffff88810a04d100
>>>> [   48.129375] R13: ffff88810a07d308 R14: 0000000000000000 R15: 
>>>> ffff88810997b800
>>>> [   48.129379] FS:  00007ffff624b9c0(0000) GS:ffff888276e80000(0000) 
>>>> knlGS:0000000000000000
>>>> [   48.129384] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [   48.129389] CR2: 000055555556f5e8 CR3: 0000000108e56000 CR4: 
>>>> 0000000000350ee0
>>>> [   48.129393] Call Trace:
>>>> [   48.129398]  __i915_sw_fence_complete+0x70/0x240 [i915]
>>>> [   48.129564]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.129572]  intel_context_init+0x173/0x1d0 [i915]
>>>> [   48.129738]  intel_context_create+0x33/0x100 [i915]
>>>> [   48.129902]  default_engines+0x9d/0x120 [i915]
>>>> [   48.130080]  i915_gem_create_context+0x465/0x630 [i915]
>>>> [   48.130258]  ? trace_kmalloc+0x29/0xd0
>>>> [   48.130264]  ? kmem_cache_alloc_trace+0x121/0x620
>>>> [   48.130271]  i915_gem_context_open+0x145/0x1d0 [i915]
>>>> [   48.130449]  i915_gem_open+0x75/0xb0 [i915]
>>>> [   48.130635]  drm_file_alloc+0x1b1/0x280 [drm]
>>>> [   48.130689]  drm_open+0xde/0x250 [drm]
>>>> [   48.130744]  drm_stub_open+0xa8/0x130 [drm]
>>>> [   48.130801]  chrdev_open+0xbf/0x240
>>>> [   48.130807]  ? cdev_device_add+0x90/0x90
>>>> [   48.130813]  do_dentry_open+0x151/0x3a0
>>>> [   48.130819]  path_openat+0x76f/0xa10
>>>> [   48.130826]  do_filp_open+0xa9/0x150
>>>> [   48.130833]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.130839]  ? _raw_spin_unlock+0x29/0x40
>>>> [   48.130847]  do_sys_openat2+0x97/0x160
>>>> [   48.130853]  __x64_sys_openat+0x54/0x90
>>>> [   48.130860]  do_syscall_64+0x38/0x90
>>>> [   48.130866]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>>> [   48.130873] RIP: 0033:0x7ffff7cdca5b
>>>> [   48.130878] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 
>>>> 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 
>>>> 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 
>>>> 33 0c 25
>>>> [   48.130883] RSP: 002b:00007fffffffda20 EFLAGS: 00000246 ORIG_RAX: 
>>>> 0000000000000101
>>>> [   48.130892] RAX: ffffffffffffffda RBX: 00007fffffffdb60 RCX: 
>>>> 00007ffff7cdca5b
>>>> [   48.130896] RDX: 0000000000000002 RSI: 00007fffffffdb60 RDI: 
>>>> 00000000ffffff9c
>>>> [   48.130901] RBP: 00007fffffffdb60 R08: 0000000000000001 R09: 
>>>> 000000000000000e
>>>> [   48.130905] R10: 0000000000000000 R11: 0000000000000246 R12: 
>>>> 0000000000000002
>>>> [   48.130909] R13: 00007ffff7f9406a R14: 0000000000000000 R15: 
>>>> 00000000fffffffb
>>>> [   48.130916] irq event stamp: 30843
>>>> [   48.130919] hardirqs last  enabled at (30849): 
>>>> [<ffffffff81126357>] __up_console_sem+0x67/0x70
>>>> [   48.130926] hardirqs last disabled at (30854): 
>>>> [<ffffffff8112633c>] __up_console_sem+0x4c/0x70
>>>> [   48.130932] softirqs last  enabled at (30050): 
>>>> [<ffffffff81c0032c>] __do_softirq+0x32c/0x499
>>>> [   48.130938] softirqs last disabled at (30035): 
>>>> [<ffffffff810ba2ed>] irq_exit_rcu+0xdd/0x130
>>>> [   48.130944] ---[ end trace 4978f2ce56481e4d ]---
>>>> [   48.130950] ------------[ cut here ]------------
>>>> [   48.130954] ODEBUG: active_state destroyed (active state 0) 
>>>> object type: i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x10 [i915]
>>>> [   48.131232] WARNING: CPU: 1 PID: 815 at lib/debugobjects.c:505 
>>>> debug_print_object+0x6e/0x90
>>>> [   48.131240] Modules linked in: i915 i2c_algo_bit ttm 
>>>> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops 
>>>> prime_numbers intel_gtt agpgart fuse nls_iso8859_1 nls_cp437 vfat 
>>>> fat intel_rapl_msr wmi_bmof intel_rapl_common x86_pkg_temp_thermal 
>>>> r8169 realtek mdio_devres coretemp libphy efi_pstore evdev sdhci_pci 
>>>> cqhci sdhci mei_me mmc_core i2c_i801 intel_pmc_core mei led_class 
>>>> wmi i2c_smbus sch_fq_codel drm ip_tables x_tables ipv6 autofs4
>>>> [   48.131381] CPU: 1 PID: 815 Comm: kms_async_flips Tainted: 
>>>> G        W         5.15.0-rc2-hsw+ #131
>>>> [   48.131387] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, 
>>>> BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
>>>> [   48.131391] RIP: 0010:debug_print_object+0x6e/0x90
>>>> [   48.131397] Code: 07 08 02 83 c0 01 8b 4b 14 4c 8b 45 00 48 c7 c7 
>>>> a0 19 0a 82 89 05 66 07 08 02 8b 43 10 48 8b 14 c5 c0 0d e4 81 e8 d7 
>>>> 2e 3c 00 <0f> 0b 83 05 c5 c0 0c 01 01 48 83 c4 08 5b 5d c3 83 05 b7 
>>>> c0 0c 01
>>>> [   48.131402] RSP: 0018:ffffc90000dabaa8 EFLAGS: 00010286
>>>> [   48.131410] RAX: 0000000000000000 RBX: ffff88810004f848 RCX: 
>>>> 0000000000000000
>>>> [   48.131414] RDX: 0000000080000001 RSI: ffffffff8112673f RDI: 
>>>> ffffffff8112673f
>>>> [   48.131419] RBP: ffffffffa0577480 R08: ffff88827fbfcfe8 R09: 
>>>> 000000000009fffb
>>>> [   48.131423] R10: 00000000fffe0000 R11: 3fffffffffffffff R12: 
>>>> ffff88810a04d100
>>>> [   48.131427] R13: ffff88810a07d308 R14: 0000000000000000 R15: 
>>>> ffff88810997b800
>>>> [   48.131432] FS:  00007ffff624b9c0(0000) GS:ffff888276e80000(0000) 
>>>> knlGS:0000000000000000
>>>> [   48.131437] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [   48.131441] CR2: 000055555556f5e8 CR3: 0000000108e56000 CR4: 
>>>> 0000000000350ee0
>>>> [   48.131446] Call Trace:
>>>> [   48.131450]  __i915_sw_fence_complete+0x9c/0x240 [i915]
>>>> [   48.131614]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.131622]  intel_context_init+0x173/0x1d0 [i915]
>>>> [   48.131787]  intel_context_create+0x33/0x100 [i915]
>>>> [   48.131951]  default_engines+0x9d/0x120 [i915]
>>>> [   48.132129]  i915_gem_create_context+0x465/0x630 [i915]
>>>> [   48.132306]  ? trace_kmalloc+0x29/0xd0
>>>> [   48.132313]  ? kmem_cache_alloc_trace+0x121/0x620
>>>> [   48.132320]  i915_gem_context_open+0x145/0x1d0 [i915]
>>>> [   48.132498]  i915_gem_open+0x75/0xb0 [i915]
>>>> [   48.132685]  drm_file_alloc+0x1b1/0x280 [drm]
>>>> [   48.132739]  drm_open+0xde/0x250 [drm]
>>>> [   48.132793]  drm_stub_open+0xa8/0x130 [drm]
>>>> [   48.132849]  chrdev_open+0xbf/0x240
>>>> [   48.132855]  ? cdev_device_add+0x90/0x90
>>>> [   48.132861]  do_dentry_open+0x151/0x3a0
>>>> [   48.132867]  path_openat+0x76f/0xa10
>>>> [   48.132874]  do_filp_open+0xa9/0x150
>>>> [   48.132881]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.132887]  ? _raw_spin_unlock+0x29/0x40
>>>> [   48.132895]  do_sys_openat2+0x97/0x160
>>>> [   48.132901]  __x64_sys_openat+0x54/0x90
>>>> [   48.132907]  do_syscall_64+0x38/0x90
>>>> [   48.132914]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>>> [   48.132921] RIP: 0033:0x7ffff7cdca5b
>>>> [   48.132926] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 
>>>> 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 
>>>> 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 
>>>> 33 0c 25
>>>> [   48.132931] RSP: 002b:00007fffffffda20 EFLAGS: 00000246 ORIG_RAX: 
>>>> 0000000000000101
>>>> [   48.132939] RAX: ffffffffffffffda RBX: 00007fffffffdb60 RCX: 
>>>> 00007ffff7cdca5b
>>>> [   48.132944] RDX: 0000000000000002 RSI: 00007fffffffdb60 RDI: 
>>>> 00000000ffffff9c
>>>> [   48.132948] RBP: 00007fffffffdb60 R08: 0000000000000001 R09: 
>>>> 000000000000000e
>>>> [   48.132952] R10: 0000000000000000 R11: 0000000000000246 R12: 
>>>> 0000000000000002
>>>> [   48.132956] R13: 00007ffff7f9406a R14: 0000000000000000 R15: 
>>>> 00000000fffffffb
>>>> [   48.132963] irq event stamp: 31465
>>>> [   48.132966] hardirqs last  enabled at (31471): 
>>>> [<ffffffff81126357>] __up_console_sem+0x67/0x70
>>>> [   48.132973] hardirqs last disabled at (31476): 
>>>> [<ffffffff8112633c>] __up_console_sem+0x4c/0x70
>>>> [   48.132979] softirqs last  enabled at (30050): 
>>>> [<ffffffff81c0032c>] __do_softirq+0x32c/0x499
>>>> [   48.132984] softirqs last disabled at (30035): 
>>>> [<ffffffff810ba2ed>] irq_exit_rcu+0xdd/0x130
>>>> [   48.132991] ---[ end trace 4978f2ce56481e4e ]---
>>>> [   48.132996] ------------[ cut here ]------------
>>>> [   48.133000] ODEBUG: deactivate destroyed (active state 0) object 
>>>> type: i915_sw_fence hint: sw_fence_dummy_notify+0x0/0x10 [i915]
>>>> [   48.133277] WARNING: CPU: 1 PID: 815 at lib/debugobjects.c:505 
>>>> debug_print_object+0x6e/0x90
>>>> [   48.133284] Modules linked in: i915 i2c_algo_bit ttm 
>>>> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops 
>>>> prime_numbers intel_gtt agpgart fuse nls_iso8859_1 nls_cp437 vfat 
>>>> fat intel_rapl_msr wmi_bmof intel_rapl_common x86_pkg_temp_thermal 
>>>> r8169 realtek mdio_devres coretemp libphy efi_pstore evdev sdhci_pci 
>>>> cqhci sdhci mei_me mmc_core i2c_i801 intel_pmc_core mei led_class 
>>>> wmi i2c_smbus sch_fq_codel drm ip_tables x_tables ipv6 autofs4
>>>> [   48.133425] CPU: 1 PID: 815 Comm: kms_async_flips Tainted: 
>>>> G        W         5.15.0-rc2-hsw+ #131
>>>> [   48.133430] Hardware name: Intel Corporation NUC7CJYH/NUC7JYB, 
>>>> BIOS JYGLKCPX.86A.0027.2018.0125.1347 01/25/2018
>>>> [   48.133434] RIP: 0010:debug_print_object+0x6e/0x90
>>>> [   48.133440] Code: 07 08 02 83 c0 01 8b 4b 14 4c 8b 45 00 48 c7 c7 
>>>> a0 19 0a 82 89 05 66 07 08 02 8b 43 10 48 8b 14 c5 c0 0d e4 81 e8 d7 
>>>> 2e 3c 00 <0f> 0b 83 05 c5 c0 0c 01 01 48 83 c4 08 5b 5d c3 83 05 b7 
>>>> c0 0c 01
>>>> [   48.133445] RSP: 0018:ffffc90000dabaa8 EFLAGS: 00010286
>>>> [   48.133453] RAX: 0000000000000000 RBX: ffff88810004f848 RCX: 
>>>> 0000000000000000
>>>> [   48.133458] RDX: 0000000080000001 RSI: ffffffff8112673f RDI: 
>>>> ffffffff8112673f
>>>> [   48.133462] RBP: ffffffffa0577480 R08: ffff88827fbfcfe8 R09: 
>>>> 000000000009fffb
>>>> [   48.133468] R10: 00000000fffe0000 R11: 3fffffffffffffff R12: 
>>>> ffff88810a04d100
>>>> [   48.133472] R13: ffff88810a07d308 R14: 0000000000000000 R15: 
>>>> ffff88810997b800
>>>> [   48.133476] FS:  00007ffff624b9c0(0000) GS:ffff888276e80000(0000) 
>>>> knlGS:0000000000000000
>>>> [   48.133481] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>>>> [   48.133486] CR2: 000055555556f5e8 CR3: 0000000108e56000 CR4: 
>>>> 0000000000350ee0
>>>> [   48.133490] Call Trace:
>>>> [   48.133495]  __i915_sw_fence_complete+0xab/0x240 [i915]
>>>> [   48.133658]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.133666]  intel_context_init+0x173/0x1d0 [i915]
>>>> [   48.133830]  intel_context_create+0x33/0x100 [i915]
>>>> [   48.142705]  default_engines+0x9d/0x120 [i915]
>>>> [   48.142861]  i915_gem_create_context+0x465/0x630 [i915]
>>>> [   48.142996]  ? trace_kmalloc+0x29/0xd0
>>>> [   48.143003]  ? kmem_cache_alloc_trace+0x121/0x620
>>>> [   48.143009]  i915_gem_context_open+0x145/0x1d0 [i915]
>>>> [   48.143141]  i915_gem_open+0x75/0xb0 [i915]
>>>> [   48.143438]  drm_file_alloc+0x1b1/0x280 [drm]
>>>> [   48.143516]  drm_open+0xde/0x250 [drm]
>>>> [   48.143557]  drm_stub_open+0xa8/0x130 [drm]
>>>> [   48.143598]  chrdev_open+0xbf/0x240
>>>> [   48.143604]  ? cdev_device_add+0x90/0x90
>>>> [   48.143608]  do_dentry_open+0x151/0x3a0
>>>> [   48.143614]  path_openat+0x76f/0xa10
>>>> [   48.143619]  do_filp_open+0xa9/0x150
>>>> [   48.143625]  ? preempt_count_sub+0x9b/0xd0
>>>> [   48.143631]  ? _raw_spin_unlock+0x29/0x40
>>>> [   48.143638]  do_sys_openat2+0x97/0x160
>>>> [   48.143644]  __x64_sys_openat+0x54/0x90
>>>> [   48.143648]  do_syscall_64+0x38/0x90
>>>> [   48.143654]  entry_SYSCALL_64_after_hwframe+0x44/0xae
>>>> [   48.143660] RIP: 0033:0x7ffff7cdca5b
>>>> [   48.143664] Code: 25 00 00 41 00 3d 00 00 41 00 74 4b 64 8b 04 25 
>>>> 18 00 00 00 85 c0 75 67 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 
>>>> 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 91 00 00 00 48 8b 4c 24 28 64 48 
>>>> 33 0c 25
>>>> [   48.143668] RSP: 002b:00007fffffffda20 EFLAGS: 00000246 ORIG_RAX: 
>>>> 0000000000000101
>>>> [   48.143675] RAX: ffffffffffffffda RBX: 00007fffffffdb60 RCX: 
>>>> 00007ffff7cdca5b
>>>> [   48.143679] RDX: 0000000000000002 RSI: 00007fffffffdb60 RDI: 
>>>> 00000000ffffff9c
>>>> [   48.143682] RBP: 00007fffffffdb60 R08: 0000000000000001 R09: 
>>>> 000000000000000e
>>>> [   48.143685] R10: 0000000000000000 R11: 0000000000000246 R12: 
>>>> 0000000000000002
>>>> [   48.143688] R13: 00007ffff7f9406a R14: 0000000000000000 R15: 
>>>> 00000000fffffffb
>>>> [   48.143693] irq event stamp: 32275
>>>> [   48.143696] hardirqs last  enabled at (32281): 
>>>> [<ffffffff81126357>] __up_console_sem+0x67/0x70
>>>> [   48.143701] hardirqs last disabled at (32286): 
>>>> [<ffffffff8112633c>] __up_console_sem+0x4c/0x70
>>>> [   48.143706] softirqs last  enabled at (32138): 
>>>> [<ffffffff81c0032c>] __do_softirq+0x32c/0x499
>>>> [   48.143710] softirqs last disabled at (32125): 
>>>> [<ffffffff810ba2ed>] irq_exit_rcu+0xdd/0x130
>>>> [   48.143716] ---[ end trace 4978f2ce56481e4f ]---
>>>
>

-- 
Jani Nikula, Intel Open Source Graphics Center




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