[Bug 106159] When connecting or disconnecting a displayport to a DP hub with 4.16.2+ kernel, hard freeze with frozen video output

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Comment # 15 on bug 106159 from
Created attachment 139132 [details]
This is the dmesg from an ssh session after attaching a monitor to my MST hub

root@nope:~/errors# uname -a
Linux nope 4.16.0-rc7+ #2 SMP Thu Apr 26 08:45:00 EDT 2018 x86_64 x86_64 x86_64
GNU/Linux

Kernel git acquired here:
https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-fixes-4.17

Key message from dmesg:

[  526.900234] Call Trace:
[  526.900280]  dm_dp_mst_get_modes+0xce/0x120 [amdgpu]
[  526.900288]  drm_helper_probe_single_connector_modes+0x199/0x6c0
[drm_kms_helper]
[  526.900294]  ? jbd2_journal_stop+0xf3/0x3e0
[  526.900297]  ? __ext4_journal_stop+0x37/0xa0
[  526.900309]  drm_mode_getconnector+0x2c4/0x300 [drm]
[  526.900314]  ? _cond_resched+0x16/0x40
[  526.900324]  ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[  526.900333]  drm_ioctl_kernel+0x67/0xb0 [drm]
[  526.900342]  drm_ioctl+0x2a9/0x350 [drm]
[  526.900352]  ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm]
[  526.900381]  amdgpu_drm_ioctl+0x46/0x80 [amdgpu]
[  526.900385]  do_vfs_ioctl+0xa2/0x5f0
[  526.900389]  ? vfs_write+0x162/0x1a0
[  526.900391]  SyS_ioctl+0x74/0x80
[  526.900395]  do_syscall_64+0x60/0x110
[  526.900399]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2


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