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 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx