http://bugzilla.kernel.org/show_bug.cgi?id=12419
sits...@yahoo.com changed:
What |Removed |Added
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CC| |sits...@yahoo.com
------- Comment #4 from sits...@yahoo.com 2009-02-15 07:58 -------
I'm seeing this on my EeePC 900 with 2.6.29rc5. It's highly reproducible:
[ 172.040511] =======================================================
[ 172.040519] [ INFO: possible circular locking dependency detected ]
[ 172.040525] 2.6.29-rc5 #16
[ 172.040529] -------------------------------------------------------
[ 172.040534] ioquake3.i386/2981 is trying to acquire lock:
[ 172.040539] (&mm->mmap_sem){----}, at: [<c017597b>] might_fault+0x4b/0xa0
[ 172.040556]
[ 172.040557] but task is already holding lock:
[ 172.040562] (&dev->struct_mutex){--..}, at: [<c02b1020>]
i915_cmdbuffer+0x90/0x530
[ 172.040575]
[ 172.040577] which lock already depends on the new lock.
[ 172.040579]
[ 172.040583]
[ 172.040584] the existing dependency chain (in reverse order) is:
[ 172.040588]
[ 172.040590] -> #2 (&dev->struct_mutex){--..}:
[ 172.040598] [<c014a92d>] validate_chain+0xb6d/0x1150
[ 172.040609] [<c014c00c>] __lock_acquire+0x31c/0x600
[ 172.040617] [<c014c367>] lock_acquire+0x77/0xa0
[ 172.040624] [<c0402376>] __mutex_lock_common+0x86/0x340
[ 172.040633] [<c040270d>] mutex_lock_nested+0x3d/0x50
[ 172.040641] [<c02a6a42>] drm_vm_open+0x32/0x50
[ 172.040649] [<c01256a3>] dup_mm+0x233/0x320
[ 172.040658] [<c0126893>] copy_process+0xcd3/0xf30
[ 172.040665] [<c0126b74>] do_fork+0x84/0x350
[ 172.040672] [<c01017b4>] sys_clone+0x34/0x40
[ 172.040680] [<c0103355>] sysenter_do_call+0x12/0x35
[ 172.040687] [<ffffffff>] 0xffffffff
[ 172.040693]
[ 172.040694] -> #1 (&mm->mmap_sem/1){--..}:
[ 172.040704] [<c014a92d>] validate_chain+0xb6d/0x1150
[ 172.040712] [<c014c00c>] __lock_acquire+0x31c/0x600
[ 172.040719] [<c014c367>] lock_acquire+0x77/0xa0
[ 172.040727] [<c013ea62>] down_write_nested+0x52/0x70
[ 172.040735] [<c0125536>] dup_mm+0xc6/0x320
[ 172.040742] [<c0126893>] copy_process+0xcd3/0xf30
[ 172.040750] [<c0126b74>] do_fork+0x84/0x350
[ 172.040757] [<c01017b4>] sys_clone+0x34/0x40
[ 172.040763] [<c0103355>] sysenter_do_call+0x12/0x35
[ 172.040770] [<ffffffff>] 0xffffffff
[ 172.040787]
[ 172.040788] -> #0 (&mm->mmap_sem){----}:
[ 172.040796] [<c014a36a>] validate_chain+0x5aa/0x1150
[ 172.040804] [<c014c00c>] __lock_acquire+0x31c/0x600
[ 172.040811] [<c014c367>] lock_acquire+0x77/0xa0
[ 172.040819] [<c01759ac>] might_fault+0x7c/0xa0
[ 172.040825] [<c02b0664>] i915_emit_box+0x24/0x290
[ 172.040832] [<c02b12e2>] i915_cmdbuffer+0x352/0x530
[ 172.040840] [<c02a147d>] drm_ioctl+0xed/0x2d0
[ 172.040847] [<c01931a7>] vfs_ioctl+0x67/0x70
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