[Bug 94759] New: [BAT BSW] lockdep splat in drm_gem_mmap
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Mar 30 11:07:55 UTC 2016
https://bugs.freedesktop.org/show_bug.cgi?id=94759
Bug ID: 94759
Summary: [BAT BSW] lockdep splat in drm_gem_mmap
Product: DRI
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: joonas.lahtinen at linux.intel.com
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 122637
--> https://bugs.freedesktop.org/attachment.cgi?id=122637&action=edit
dmesg from I-G-T run
At:
/archive/results/CI_IGT_test/Patchwork_1712/bsw-nuc-2/html/bsw-nuc-2 at Patchwork_1712@1/igt at gem_exec_basic@gtt-blt.html
Log beginning (full log attached):
[ 149.921578] ======================================================
[ 149.921640] [ INFO: possible circular locking dependency detected ]
[ 149.921703] 4.5.0-gfxbench+ #1 Not tainted
[ 149.921745] -------------------------------------------------------
[ 149.921807] gem_exec_basic/5896 is trying to acquire lock:
[ 149.921861] (&dev->struct_mutex){+.+.+.}, at: [<ffffffff81514ea1>]
drm_gem_mmap+0x1a1/0x270
[ 149.921969]
but task is already holding lock:
[ 149.922027] (&mm->mmap_sem){++++++}, at: [<ffffffff8117d8c4>]
vm_mmap_pgoff+0x44/0xa0
[ 149.922125]
which lock already depends on the new lock.
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