[Bug 71208] [HSW]module_reload segfault

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71208

--- Comment #2 from lu hua <huax.lu at intel.com> ---
Created attachment 88992
  --> https://bugs.freedesktop.org/attachment.cgi?id=88992&action=edit
dmesg

Test on latest -nightly branch. It still fails on -nightly branch. 
output:
./drv_module_reload: line 27:  3995 Killed                  rmmod i915
WARNING: i915.ko still loaded!
./drv_module_reload: line 43: /sys/class/vtconsole/vtcon1/bind: No such file or
directory

Call Trace:
[   42.883496]  [<ffffffffa000996a>] ? drm_put_minor+0x35/0x40 [drm]
[   42.883587]  [<ffffffffa0009985>] ? drm_dev_free+0x10/0x66 [drm]
[   42.883677]  [<ffffffff812eb020>] ? pci_device_remove+0x24/0x48
[   42.883768]  [<ffffffff8136d1df>] ? __device_release_driver+0x68/0xc1
[   42.883858]  [<ffffffff8136d8b9>] ? driver_detach+0x6e/0x99
[   42.883946]  [<ffffffff8136d03b>] ? bus_remove_driver+0x78/0xb9
[   42.884035]  [<ffffffff812eb155>] ? pci_unregister_driver+0x17/0x75
[   42.884127]  [<ffffffffa000b208>] ? drm_pci_exit+0x3b/0x72 [drm]
[   42.884217]  [<ffffffff81077d1d>] ? SyS_delete_module+0x1a3/0x219
[   42.884307]  [<ffffffff81047783>] ? task_work_run+0x78/0x89
[   42.884396]  [<ffffffff81709f72>] ? page_fault+0x22/0x30
[   42.884484]  [<ffffffff8170ec62>] ? system_call_fastpath+0x16/0x1b
[   42.884573] Code: 18 be 2f 00 00 00 48 c7 c7 a4 83 02 a0 e8 7a 99 02 e1 c6
05 be 36 02 00 01 48 89 d8 5b c3 48 85 ff 53 48 89 fb 74 26 48 8b 47 10 <f6> 40
4c 02 74 1c e8 63 d3 00 00 48 89 df e8 4c 2d 00 00 8b 33
[   42.886706] RIP  [<ffffffffa0009855>] drm_unplug_minor+0xd/0x31 [drm]
[   42.886827]  RSP <ffff8800881f5e18>
[   42.886911] CR2: 000000000000004c
[   42.887000] ---[ end trace 04d77421c25f93bf ]---

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