https://bugzilla.kernel.org/show_bug.cgi?id=41682 --- Comment #5 from Witold Baryluk <baryluk@xxxxxxxxxxxxxxxx> 2011-08-25 10:32:15 --- Next one, after reboot. (I was trying to revert commit 2581fdc810889fdea97689cb62481201d579c796, however I do not know if I booted using it, or no :/, so assume it is still with this commit). [ 5473.013620] [ 5473.013622] ======================================================= [ 5473.013626] [ INFO: possible circular locking dependency detected ] [ 5473.013630] 3.1.0-rc3-t43-prod-00098-gd8e9618-dirty #11 [ 5473.013632] ------------------------------------------------------- [ 5473.013635] mplayer/13337 is trying to acquire lock: [ 5473.013639] (&fb_info->lock){+.+.+.}, at: [<c1276f37>] fb_release+0x17/0x50 [ 5473.013652] [ 5473.013653] but task is already holding lock: [ 5473.013656] (&mm->mmap_sem){++++++}, at: [<c10bbac2>] sys_munmap+0x22/0x50 [ 5473.013665] [ 5473.013666] which lock already depends on the new lock. [ 5473.013667] [ 5473.013670] [ 5473.013670] the existing dependency chain (in reverse order) is: [ 5473.013673] [ 5473.013674] -> #2 (&mm->mmap_sem){++++++}: [ 5473.013679] [<c1073e58>] lock_acquire+0x78/0xa0 [ 5473.013687] [<c10b2c5b>] might_fault+0x6b/0x90 [ 5473.013691] [<f8bd1a00>] drm_mode_getresources+0x180/0x580 [drm] [ 5473.013715] [<f8bc5143>] drm_ioctl+0x1e3/0x500 [drm] [ 5473.013725] [<c10ec7df>] do_vfs_ioctl+0x7f/0x5b0 [ 5473.013730] [<c10ecd3d>] sys_ioctl+0x2d/0x60 [ 5473.013734] [<c16307dc>] sysenter_do_call+0x12/0x3c [ 5473.013741] [ 5473.013742] -> #1 (&dev->mode_config.mutex){+.+.+.}: [ 5473.013748] [<c1073e58>] lock_acquire+0x78/0xa0 [ 5473.013752] [<c162de94>] mutex_lock_nested+0x44/0x2c0 [ 5473.013757] [<f8c50db3>] drm_fb_helper_set_par+0x33/0xd0 [drm_kms_helper] [ 5473.013764] [<c1276cec>] fb_set_var+0x17c/0x390 [ 5473.013769] [<c1277bec>] do_fb_ioctl+0x25c/0x4b0 [ 5473.013774] [<c1277e8b>] fb_ioctl+0x4b/0x60 [ 5473.013778] [<c10ec7df>] do_vfs_ioctl+0x7f/0x5b0 [ 5473.013783] [<c10ecd3d>] sys_ioctl+0x2d/0x60 [ 5473.013787] [<c16307dc>] sysenter_do_call+0x12/0x3c [ 5473.013791] [ 5473.013792] -> #0 (&fb_info->lock){+.+.+.}: [ 5473.013797] [<c107373c>] __lock_acquire+0x13cc/0x1640 [ 5473.013802] [<c1073e58>] lock_acquire+0x78/0xa0 [ 5473.013806] [<c162de94>] mutex_lock_nested+0x44/0x2c0 [ 5473.013811] [<c1276f37>] fb_release+0x17/0x50 [ 5473.013815] [<c10dde9e>] fput+0xbe/0x1e0 [ 5473.013820] [<c10b94bd>] remove_vma+0x2d/0x60 [ 5473.013825] [<c10ba462>] do_munmap+0x182/0x2d0 [ 5473.013830] [<c10bbacf>] sys_munmap+0x2f/0x50 [ 5473.013834] [<c16307dc>] sysenter_do_call+0x12/0x3c [ 5473.013839] [ 5473.013840] other info that might help us debug this: [ 5473.013841] [ 5473.013843] Chain exists of: [ 5473.013844] &fb_info->lock --> &dev->mode_config.mutex --> &mm->mmap_sem [ 5473.013852] [ 5473.013854] Possible unsafe locking scenario: [ 5473.013855] [ 5473.013857] CPU0 CPU1 [ 5473.013859] ---- ---- [ 5473.013861] lock(&mm->mmap_sem); [ 5473.013865] lock(&dev->mode_config.mutex); [ 5473.013869] lock(&mm->mmap_sem); [ 5473.013873] lock(&fb_info->lock); [ 5473.013877] [ 5473.013878] *** DEADLOCK *** [ 5473.013879] [ 5473.013882] 1 lock held by mplayer/13337: [ 5473.013884] #0: (&mm->mmap_sem){++++++}, at: [<c10bbac2>] sys_munmap+0x22/0x50 [ 5473.013892] [ 5473.013892] stack backtrace: [ 5473.013897] Pid: 13337, comm: mplayer Not tainted 3.1.0-rc3-t43-prod-00098-gd8e9618-dirty #11 [ 5473.013900] Call Trace: [ 5473.013906] [<c1627339>] ? printk+0x18/0x1a [ 5473.013911] [<c16279e2>] print_circular_bug+0x1de/0x1e8 [ 5473.013916] [<c107373c>] __lock_acquire+0x13cc/0x1640 [ 5473.013921] [<c1073e58>] lock_acquire+0x78/0xa0 [ 5473.013925] [<c1276f37>] ? fb_release+0x17/0x50 [ 5473.013929] [<c162de94>] mutex_lock_nested+0x44/0x2c0 [ 5473.013934] [<c1276f37>] ? fb_release+0x17/0x50 [ 5473.013938] [<c10b363c>] ? tlb_finish_mmu+0xc/0x40 [ 5473.013943] [<c10b96ca>] ? unmap_region+0xba/0xd0 [ 5473.013947] [<c1276f37>] fb_release+0x17/0x50 [ 5473.013951] [<c10dde9e>] fput+0xbe/0x1e0 [ 5473.013955] [<c10b94bd>] remove_vma+0x2d/0x60 [ 5473.013960] [<c10ba462>] do_munmap+0x182/0x2d0 [ 5473.013964] [<c10bbacf>] sys_munmap+0x2f/0x50 [ 5473.013969] [<c16307dc>] sysenter_do_call+0x12/0x3c -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
