Messages in this thread | | | Date | Tue, 22 Nov 2011 22:38:50 -0500 | From | Dave Jones <> | Subject | tty related lockdep trace during bootup on 3.2-rc2 |
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From Linus' current tree...
related to 5dc2470c602da8851907ec18942cd876c3b4ecc1 maybe ?
Dave
[ 40.778011] ====================================================== [ 40.780010] [ INFO: possible circular locking dependency detected ] [ 40.780010] 3.2.0-rc2+ #8 [ 40.780010] ------------------------------------------------------- [ 40.780010] modem-manager/1141 is trying to acquire lock: [ 40.780010] (big_tty_mutex){+.+.+.}, at: [<ffffffff81682807>] tty_lock+0x17/0x19 [ 40.780010] [ 40.780010] but task is already holding lock: [ 40.780010] (open_mutex){+.+...}, at: [<ffffffffa032b321>] acm_tty_close+0x41/0xc0 [cdc_acm] [ 40.780010] [ 40.780010] which lock already depends on the new lock. [ 40.780010] [ 40.780010] [ 40.780010] the existing dependency chain (in reverse order) is: [ 40.780010] [ 40.780010] -> #1 (open_mutex){+.+...}: [ 40.780010] [<ffffffff810c1d9d>] lock_acquire+0x9d/0x210 [ 40.780010] [<ffffffff8168003e>] __mutex_lock_common+0x5e/0x4f0 [ 40.780010] [<ffffffff81680604>] mutex_lock_nested+0x44/0x50 [ 40.780010] [<ffffffffa032b715>] acm_tty_open+0x35/0x230 [cdc_acm] [ 40.780010] [<ffffffff813c1087>] tty_open+0x247/0x5d0 [ 40.780010] [<ffffffff811b5408>] chrdev_open+0x258/0x350 [ 40.780010] [<ffffffff811ad9a4>] __dentry_open+0x384/0x550 [ 40.780010] [<ffffffff811af194>] nameidata_to_filp+0x74/0x80 [ 40.780010] [<ffffffff811c0b6c>] do_last+0x26c/0x920 [ 40.780010] [<ffffffff811c1335>] path_openat+0xd5/0x3e0 [ 40.780010] [<ffffffff811c1762>] do_filp_open+0x42/0xa0 [ 40.780010] [<ffffffff811af297>] do_sys_open+0xf7/0x1d0 [ 40.780010] [<ffffffff811af390>] sys_open+0x20/0x30 [ 40.780010] [<ffffffff81689f82>] system_call_fastpath+0x16/0x1b [ 40.780010] [ 40.780010] -> #0 (big_tty_mutex){+.+.+.}: [ 40.780010] [<ffffffff810c112e>] __lock_acquire+0x16ce/0x1c40 [ 40.780010] [<ffffffff810c1d9d>] lock_acquire+0x9d/0x210 [ 40.780010] [<ffffffff8168003e>] __mutex_lock_common+0x5e/0x4f0 [ 40.780010] [<ffffffff81680604>] mutex_lock_nested+0x44/0x50 [ 40.780010] [<ffffffff81682807>] tty_lock+0x17/0x19 [ 40.780010] [<ffffffff813c91ad>] tty_port_close_start+0x17d/0x210 [ 40.780010] [<ffffffffa032b32f>] acm_tty_close+0x4f/0xc0 [cdc_acm] [ 40.780010] [<ffffffff813c09e7>] tty_release+0x167/0x5c0 [ 40.780010] [<ffffffff811b252e>] fput+0xfe/0x2d0 [ 40.780010] [<ffffffff811adee9>] filp_close+0x69/0x90 [ 40.780010] [<ffffffff811ae1d0>] sys_close+0xc0/0x1a0 [ 40.780010] [<ffffffff81689f82>] system_call_fastpath+0x16/0x1b [ 40.780010] [ 40.780010] other info that might help us debug this: [ 40.780010] [ 40.780010] Possible unsafe locking scenario: [ 40.780010] [ 40.780010] CPU0 CPU1 [ 40.780010] ---- ---- [ 40.780010] lock(open_mutex); [ 40.780010] lock(big_tty_mutex); [ 40.780010] lock(open_mutex); [ 40.780010] lock(big_tty_mutex); [ 40.780010] [ 40.780010] *** DEADLOCK *** [ 40.780010] [ 40.780010] 1 lock held by modem-manager/1141: [ 40.780010] #0: (open_mutex){+.+...}, at: [<ffffffffa032b321>] acm_tty_close+0x41/0xc0 [cdc_acm] [ 40.780010] [ 40.780010] stack backtrace: [ 40.780010] Pid: 1141, comm: modem-manager Not tainted 3.2.0-rc2+ #8 [ 40.780010] Call Trace: [ 40.780010] [<ffffffff81675378>] print_circular_bug+0x202/0x213 [ 40.780010] [<ffffffff810c112e>] __lock_acquire+0x16ce/0x1c40 [ 40.780010] [<ffffffff81021f62>] ? native_sched_clock+0x22/0x70 [ 40.780010] [<ffffffff810ae2c5>] ? sched_clock_local+0x25/0x90 [ 40.780010] [<ffffffff810c1d9d>] lock_acquire+0x9d/0x210 [ 40.780010] [<ffffffff81682807>] ? tty_lock+0x17/0x19 [ 40.780010] [<ffffffff810c180a>] ? lock_release_non_nested+0x16a/0x350 [ 40.780010] [<ffffffff8168003e>] __mutex_lock_common+0x5e/0x4f0 [ 40.780010] [<ffffffff81682807>] ? tty_lock+0x17/0x19 [ 40.780010] [<ffffffff810c2796>] ? mark_held_locks+0x86/0x150 [ 40.780010] [<ffffffff816807ae>] ? mutex_unlock+0xe/0x10 [ 40.780010] [<ffffffff81682807>] ? tty_lock+0x17/0x19 [ 40.780010] [<ffffffff81680604>] mutex_lock_nested+0x44/0x50 [ 40.780010] [<ffffffff81682807>] tty_lock+0x17/0x19 [ 40.780010] [<ffffffff813c91ad>] tty_port_close_start+0x17d/0x210 [ 40.780010] [<ffffffffa032b32f>] acm_tty_close+0x4f/0xc0 [cdc_acm] [ 40.780010] [<ffffffff813c09e7>] tty_release+0x167/0x5c0 [ 40.780010] [<ffffffff81021fb9>] ? sched_clock+0x9/0x10 [ 40.780010] [<ffffffff810ae2c5>] ? sched_clock_local+0x25/0x90 [ 40.780010] [<ffffffff811b252e>] fput+0xfe/0x2d0 [ 40.780010] [<ffffffff811adee9>] filp_close+0x69/0x90 [ 40.780010] [<ffffffff811ae1d0>] sys_close+0xc0/0x1a0 [ 40.780010] [<ffffffff81689f82>] system_call_fastpath+0x16/0x1b
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