https://bugs.freedesktop.org/show_bug.cgi?id=93652

--- Comment #4 from Wolfgang Frisch <wfr@roembden.net> ---
Linux 4.5-rc7: The call trace seems to have changed since 4.5-rc4.

The desktop hangs irrevocably after a few minutes of running the game "Left 4
Dead 2". The issue does not occur with an old Nvidia GPU and the nouveau
drivers.


[ 1080.214273] INFO: task Xorg:5799 blocked for more than 120 seconds.
[ 1080.214277]       Not tainted 4.5.0-rc7-desktop #1
[ 1080.214279] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 1080.214282] Xorg            D ffff88043ec13fc0     0  5799   5326 0x00000084
[ 1080.214286]  ffff880420b1fa30 0000000000000000 ffff8800bcaa23c0
0000000000000000
[ 1080.214289]  0000000000000000 ffff880420b20000 ffff880420b1fa48
ffff88042c9d8000
[ 1080.214292]  0000000000000001 0000000000000000 ffff88042ab70040
ffff88042c9de178
[ 1080.214295] Call Trace:
[ 1080.214302]  [<ffffffff818a38b8>] ? schedule+0x7f/0x93
[ 1080.214306]  [<ffffffff818a38b8>] ? schedule+0x7f/0x93
[ 1080.214331]  [<ffffffffa004d52e>] ? amd_sched_entity_push_job+0x52/0x6b
[amdgpu]
[ 1080.214335]  [<ffffffff810bd080>] ? wait_woken+0x66/0x66
[ 1080.214355]  [<ffffffffa004d950>] ?
amdgpu_sched_ib_submit_kernel_helper+0xfd/0x170 [amdgpu]
[ 1080.214373]  [<ffffffffa001aa00>] ? amdgpu_gem_prime_export+0x3f/0x3f
[amdgpu]
[ 1080.214391]  [<ffffffffa001b064>] ? amdgpu_vm_bo_update_mapping+0x324/0x414
[amdgpu]
[ 1080.214410]  [<ffffffffa001b9fa>] ? amdgpu_vm_bo_update+0xe0/0x172 [amdgpu]
[ 1080.214427]  [<ffffffffa0010b53>] ? amdgpu_gem_va_update_vm+0x159/0x1a8
[amdgpu]
[ 1080.214445]  [<ffffffffa001be17>] ? amdgpu_vm_bo_map+0x198/0x335 [amdgpu]
[ 1080.214462]  [<ffffffffa0011a34>] ? amdgpu_gem_va_ioctl+0x2b7/0x343 [amdgpu]
[ 1080.214478]  [<ffffffffa0011a34>] ? amdgpu_gem_va_ioctl+0x2b7/0x343 [amdgpu]
[ 1080.214482]  [<ffffffff8148f8c3>] ? drm_ioctl+0x225/0x353
[ 1080.214484]  [<ffffffff8148f8c3>] ? drm_ioctl+0x225/0x353
[ 1080.214501]  [<ffffffffa001177d>] ? amdgpu_gem_metadata_ioctl+0x1c7/0x1c7
[amdgpu]
[ 1080.214505]  [<ffffffff81131fa2>] ? __do_fault+0x61/0xaa
[ 1080.214519]  [<ffffffffa0000046>] ? amdgpu_drm_ioctl+0x46/0x72 [amdgpu]
[ 1080.214522]  [<ffffffff8116e1db>] ? vfs_ioctl+0x16/0x23
[ 1080.214524]  [<ffffffff8116e6f9>] ? do_vfs_ioctl+0x49e/0x50e
[ 1080.214527]  [<ffffffff810fec2c>] ? __audit_syscall_entry+0xbb/0xdf
[ 1080.214530]  [<ffffffff8116e7b6>] ? SyS_ioctl+0x4d/0x6f
[ 1080.214533]  [<ffffffff818a64d7>] ? entry_SYSCALL_64_fastpath+0x12/0x66

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