Bug 11662
| Summary: | possible recursive locking in ps2_command | ||
|---|---|---|---|
| Product: | Drivers | Reporter: | Michael S. Tsirkin (m.s.tsirkin) |
| Component: | Input Devices | Assignee: | drivers_input-devices |
| Status: | RESOLVED DUPLICATE | ||
| Severity: | normal | CC: | dmitry.torokhov |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.27-rc7 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
Latest working kernel version: N/A Earliest failing kernel version: N/A Distribution: ubuntu gutsy Hardware Environment: T60p Software Environment: Problem Description: I got the following warnings once on resume on my T60p, this might indicate a potential deadlock I think. This did not reproduce for me since. [33491.050660] psmouse.c: Failed to enable mouse on isa0060/serio1 [33491.054938] PM: Removing info for No Bus:mouse1 [33491.064134] PM: Removing info for No Bus:event8 [33491.080154] PM: Removing info for No Bus:input8 [33491.089117] [33491.089120] ============================================= [33491.089128] [ INFO: possible recursive locking detected ] [33491.089133] 2.6.27-rc7-mst #53 [33491.089137] --------------------------------------------- [33491.089141] kseriod/147 is trying to acquire lock: [33491.089146] (&ps2dev->cmd_mutex){--..}, at: [<c028cdf3>] ps2_command+0x43/0x3a0 [33491.089162] [33491.089163] but task is already holding lock: [33491.089168] (&ps2dev->cmd_mutex){--..}, at: [<c028cdf3>] ps2_command+0x43/0x3a0 [33491.089179] [33491.089180] other info that might help us debug this: [33491.089185] 4 locks held by kseriod/147: [33491.089189] #0: (serio_mutex){--..}, at: [<c028b612>] serio_thread+0x22/0x340 [33491.089204] #1: (&serio->drv_mutex){--..}, at: [<c028aad4>] serio_connect_driver+0x24/0x50 [33491.089218] #2: (psmouse_mutex){--..}, at: [<f8a355ca>] psmouse_connect+0x1a/0x250 [psmouse] [33491.089246] #3: (&ps2dev->cmd_mutex){--..}, at: [<c028cdf3>] ps2_command+0x43/0x3a0 [33491.089259] [33491.089260] stack backtrace: [33491.089266] Pid: 147, comm: kseriod Not tainted 2.6.27-rc7-mst #53 [33491.089272] [<c014b924>] validate_chain+0xbd4/0xeb0 [33491.089282] [<c014978a>] ? find_usage_backwards+0x1a/0x100 [33491.089293] [<c014be39>] __lock_acquire+0x239/0x950 [33491.089301] [<c014ae10>] ? validate_chain+0xc0/0xeb0 [33491.089311] [<c014c5ae>] lock_acquire+0x5e/0x80 [33491.089319] [<c028cdf3>] ? ps2_command+0x43/0x3a0 [33491.089327] [<c033163f>] mutex_lock_nested+0x9f/0x270 [33491.089337] [<c028cdf3>] ? ps2_command+0x43/0x3a0 [33491.089346] [<c028cdf3>] ? ps2_command+0x43/0x3a0 [33491.089354] [<c014be39>] ? __lock_acquire+0x239/0x950 [33491.089363] [<c028cdf3>] ps2_command+0x43/0x3a0 [33491.089371] [<c014a4cb>] ? mark_held_locks+0x6b/0x80 [33491.089389] [<f8a34682>] psmouse_sliced_command+0x22/0x70 [psmouse] [33491.089404] [<c014a634>] ? trace_hardirqs_on_caller+0xc4/0x150 [33491.089418] [<f8a36ffe>] synaptics_pt_write+0x1e/0x50 [psmouse] [33491.089433] [<c028cbcb>] ps2_sendbyte+0x3b/0x100 [33491.089440] [<c014a634>] ? trace_hardirqs_on_caller+0xc4/0x150 [33491.089450] [<c014a6cb>] ? trace_hardirqs_on+0xb/0x10 [33491.089459] [<c028ce89>] ps2_command+0xd9/0x3a0 [33491.089467] [<c014a6cb>] ? trace_hardirqs_on+0xb/0x10 [33491.089476] [<c0332ed2>] ? _spin_unlock_irq+0x22/0x30 [33491.089492] [<f8a347bd>] psmouse_probe+0x1d/0xa0 [psmouse] [33491.089508] [<f8a356ee>] psmouse_connect+0x13e/0x250 [psmouse] [33491.089539] [<c028aadb>] serio_connect_driver+0x2b/0x50 [33491.089557] [<c028ab16>] serio_driver_probe+0x16/0x20 [33491.089565] [<c0278c54>] driver_probe_device+0x84/0x180 [33491.089574] [<c0332a2d>] ? _spin_unlock+0x1d/0x20 [33491.089584] [<c0323013>] ? klist_next+0x63/0xa0 [33491.089593] [<c0278dd8>] __device_attach+0x8/0x10 [33491.089602] [<c0278047>] bus_for_each_drv+0x47/0x70 [33491.089610] [<c0278e7e>] device_attach+0x6e/0x80 [33491.089618] [<c0278dd0>] ? __device_attach+0x0/0x10 [33491.089628] [<c028ab34>] serio_find_driver+0x14/0x50 [33491.089636] [<c028ae36>] ? serio_disconnect_port+0x56/0x60 [33491.089646] [<c028af02>] serio_reconnect_port+0x52/0x80 [33491.089654] [<c028b89c>] serio_thread+0x2ac/0x340 [33491.089662] [<c014a6cb>] ? trace_hardirqs_on+0xb/0x10 [33491.089672] [<c013be80>] ? autoremove_wake_function+0x0/0x50 [33491.089681] [<c028b5f0>] ? serio_thread+0x0/0x340 [33491.089691] [<c013bb82>] kthread+0x42/0x70 [33491.089697] [<c013bb40>] ? kthread+0x0/0x70 [33491.089705] [<c010489b>] kernel_thread_helper+0x7/0x1c [33491.089714] ======================= Steps to reproduce: I only saw this once on resume from suspend to ram.