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SubjectRe: [REGRESSION 4.12] i915 Oops at intel_fbdev_invalidate()
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Quoting Takashi Iwai (2017-06-30 16:38:46)
> Hi,
>
> I hit an Oops with the latest Linus tree (4.12-rc7+) on a HSW machine
> like the following at boot:
>
> BUG: unable to handle kernel NULL pointer dereference at 00000000000000b0
> IP: intel_fbdev_invalidate.isra.3+0xc/0x40 [i915]
> Oops: 0000 [#1] PREEMPT SMP
> CPU: 2 PID: 833 Comm: X Not tainted 4.10.0-rc5-btest9+ #15
> Hardware name: Hewlett-Packard HP ProBook 430 G1/1946, BIOS L73 Ver. 08.05 2013/03/15
> task: ffff917313db8000 task.stack: ffffb6e70379c000
> RIP: 0010:intel_fbdev_invalidate.isra.3+0xc/0x40 [i915]
> RSP: 0018:ffffb6e70379fde0 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff9172f70e1c00 RCX: 0000000000000000
> RDX: ffff917313db8000 RSI: 0000000000000000 RDI: ffff91731934d040
> RBP: ffffb6e70379fdf0 R08: 0000000000000002 R09: ffff91731934ead0
> R10: ffff9173192f0368 R11: 0000000000000001 R12: ffff9173192f0000
> R13: ffff9172f71016e8 R14: ffff9173227c8480 R15: ffff9172f71016c8
> FS: 00007f8cc8c3fa00(0000) GS:ffff9173c0a80000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000000000b0 CR3: 000000006273b000 CR4: 00000000001406e0
> Call Trace:
> ? intel_fbdev_restore_mode+0x4e/0x70 [i915]
> i915_driver_lastclose+0xe/0x20 [i915]
> drm_lastclose+0x3b/0xf0 [drm]
> drm_release+0x2b8/0x360 [drm]
> __fput+0xd9/0x1e0
> ____fput+0xe/0x10
> task_work_run+0x83/0xa0
> exit_to_usermode_loop+0x59/0x85
> do_syscall_64+0xb3/0xd0
> entry_SYSCALL64_slow_path+0x25/0x25
>
> And git bisection leaded to the commit
> fabef825626d7bd05a321e4427fdf31a169b5173
> drm/i915: Drop struct_mutex around frontbuffer flushes
>
> The band-aid patch below seems fixing it.

See https://patchwork.freedesktop.org/patch/163261/
-Chris

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