[Bug 100099] [BAT] [KBL] nvme driver is using a mutex inside an rcu callback causing igt at gem_exec_suspend@basic-s4-devices to fail with dmesg-warn

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100099

--- Comment #2 from Chris Wilson <chris at chris-wilson.co.uk> ---
Also

[  245.294829] 
               -> #5 (&dev->struct_mutex){+.+.+.}:
[  245.294836]        lock_acquire+0xc9/0x220
[  245.294842]        drm_gem_object_put_unlocked+0x40/0xc0
[  245.294845]        drm_gem_mmap+0xd1/0x100
[  245.294849]        mmap_region+0x39e/0x600
[  245.294851]        do_mmap+0x44c/0x500
[  245.294853]        vm_mmap_pgoff+0x9d/0xd0
[  245.294856]        SyS_mmap_pgoff+0x182/0x220
[  245.294858]        SyS_mmap+0x16/0x20
[  245.294862]        entry_SYSCALL_64_fastpath+0x1c/0xb1

is a false chain. We still do take the struct_mutex underneath mm->mmap_sem via
i915_gem_fault() though.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
You are on the CC list for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20170307/fb6ab85e/attachment.html>