https://bugzilla.novell.com/show_bug.cgi?id=480239 User jslaby@novell.com added comment https://bugzilla.novell.com/show_bug.cgi?id=480239#c1 Summary: losetup: circular locking dependency Classification: openSUSE Product: openSUSE 11.1 Version: Final Platform: All OS/Version: Other Status: ASSIGNED Severity: Normal Priority: P5 - None Component: Kernel AssignedTo: jslaby@novell.com ReportedBy: jslaby@novell.com QAContact: qa@suse.de CC: gp@novell.com Blocks: 370872 Found By: --- usbhid: v2.6:USB HID core driver ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.27.17-20090217_954248e4-default #1 ------------------------------------------------------- losetup/1734 is trying to acquire lock: (&bdev->bd_mutex){--..}, at: [<c01b901f>] __blkdev_put+0x1f/0x121 but task is already holding lock: (&lo->lo_ctl_mutex){--..}, at: [<f9260a9f>] lo_ioctl+0x39/0x12a [loop] which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&lo->lo_ctl_mutex){--..}: [<c0148788>] add_lock_to_list+0x71/0xa0 [<c014abe8>] check_prev_add+0x30f/0x46f [<c014b12b>] validate_chain+0x3e3/0x50b [<c014b898>] __lock_acquire+0x645/0x6ac [<c014b970>] lock_acquire+0x71/0x93 [<c034fe6f>] mutex_lock_nested+0xe4/0x28d [<f925f207>] lo_open+0x20/0x2f [loop] [<c01b9433>] do_open+0xc4/0x2bb [<c01b964f>] blkdev_open+0x25/0x4d [<c0194505>] __dentry_open+0x10e/0x1fd [<c019468c>] nameidata_to_filp+0x27/0x37 [<c019fbae>] do_filp_open+0x377/0x703 [<c01942fb>] do_sys_open+0x46/0xcc [<c01943cf>] sys_open+0x23/0x28 [<c0104c4b>] sysenter_do_call+0x12/0x3f [<ffffe430>] 0xffffe430 [<ffffffff>] 0xffffffff -> #0 (&bdev->bd_mutex){--..}: [<c014a51a>] print_circular_bug_tail+0x6d/0xa6 [<c014b12b>] validate_chain+0x3e3/0x50b [<c014b898>] __lock_acquire+0x645/0x6ac [<c014b970>] lock_acquire+0x71/0x93 [<c034fe6f>] mutex_lock_nested+0xe4/0x28d [<c01b901f>] __blkdev_put+0x1f/0x121 [<c0196bbe>] __fput+0x99/0x14a [<f9260390>] loop_clr_fd+0x150/0x17d [loop] [<f9260af4>] lo_ioctl+0x8e/0x12a [loop] [<c0213cda>] blkdev_driver_ioctl+0x4e/0x5e [<c02145d2>] blkdev_ioctl+0x206/0x220 [<c01b8b65>] block_ioctl+0x18/0x1b [<c01a0a0b>] vfs_ioctl+0x1f/0x62 [<c01a0c9f>] do_vfs_ioctl+0x167/0x172 [<c01a0cef>] sys_ioctl+0x45/0x5e [<c0104c4b>] sysenter_do_call+0x12/0x3f [<ffffe430>] 0xffffe430 [<ffffffff>] 0xffffffff other info that might help us debug this: 1 lock held by losetup/1734: #0: (&lo->lo_ctl_mutex){--..}, at: [<f9260a9f>] lo_ioctl+0x39/0x12a [loop] stack backtrace: Pid: 1734, comm: losetup Tainted: G 2.6.27.17-20090217_954248e4-default #1 [<c010661a>] dump_trace+0x6b/0x249 [<c01071a9>] show_trace+0x20/0x39 [<c034ed6d>] dump_stack+0x71/0x76 [<c014a54b>] print_circular_bug_tail+0x9e/0xa6 [<c014b12b>] validate_chain+0x3e3/0x50b [<c014b898>] __lock_acquire+0x645/0x6ac [<c014b970>] lock_acquire+0x71/0x93 [<c034fe6f>] mutex_lock_nested+0xe4/0x28d [<c01b901f>] __blkdev_put+0x1f/0x121 [<c0196bbe>] __fput+0x99/0x14a [<f9260390>] loop_clr_fd+0x150/0x17d [loop] [<f9260af4>] lo_ioctl+0x8e/0x12a [loop] [<c0213cda>] blkdev_driver_ioctl+0x4e/0x5e [<c02145d2>] blkdev_ioctl+0x206/0x220 [<c01b8b65>] block_ioctl+0x18/0x1b [<c01a0a0b>] vfs_ioctl+0x1f/0x62 [<c01a0c9f>] do_vfs_ioctl+0x167/0x172 [<c01a0cef>] sys_ioctl+0x45/0x5e [<c0104c4b>] sysenter_do_call+0x12/0x3f [<ffffe430>] 0xffffe430 ======================= bootsplash: status on console 0 changed to on -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.