[Bug 94759] [BAT BSW] lockdep splat in drm_gem_mmap
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Thu Mar 31 14:16:46 UTC 2016
https://bugs.freedesktop.org/show_bug.cgi?id=94759
--- Comment #2 from Joonas Lahtinen <joonas.lahtinen at linux.intel.com> ---
Also in gem_mmap_gtt, same chain:
[ 145.549678] ======================================================
[ 145.549739] [ INFO: possible circular locking dependency detected ]
[ 145.549803] 4.6.0-rc1-gfxbench+ #1 Tainted: G U
[ 145.549858] -------------------------------------------------------
[ 145.549919] gem_mmap_gtt/5996 is trying to acquire lock:
[ 145.549971] (&dev->struct_mutex){+.+.+.}, at: [<ffffffff8151c781>]
drm_gem_mmap+0x1a1/0x270
[ 145.550077]
but task is already holding lock:
[ 145.550134] (&mm->mmap_sem){++++++}, at: [<ffffffff81183204>]
vm_mmap_pgoff+0x44/0xa0
[ 145.550230]
which lock already depends on the new lock.
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