Hi,
I have got a regression with a 3.14-mw kernel (last commit is 4ba9920e5e9c0e16b5ed24292d45322907bb9035)
when a script is started that reads from serial over bluetooth, that wasn't in the 3.13 release kernel:
Jan 26 11:36:10 serveerstertje kernel: [ 72.892926]
Jan 26 11:36:10 serveerstertje kernel: [ 72.900249] ======================================================
Jan 26 11:36:10 serveerstertje kernel: [ 72.907697] [ INFO: possible circular locking dependency detected ]
Jan 26 11:36:10 serveerstertje kernel: [ 72.915214] 3.13.0-20140125-mw-pcireset+ #1 Not tainted
Jan 26 11:36:10 serveerstertje kernel: [ 72.922307] -------------------------------------------------------
Jan 26 11:36:10 serveerstertje kernel: [ 72.928315] zabbix_slimmeme/5909 is trying to acquire lock:
Jan 26 11:36:10 serveerstertje kernel: [ 72.934323] (&tty->legacy_mutex){+.+.+.}, at: [<ffffffff81ad6344>] tty_lock_nested+0x44/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 72.940434]
Jan 26 11:36:10 serveerstertje kernel: [ 72.940434] but task is already holding lock:
Jan 26 11:36:10 serveerstertje kernel: [ 72.952263] (&port->mutex){+.+.+.}, at: [<ffffffff81518aa7>] tty_port_open+0x67/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 72.958292]
Jan 26 11:36:10 serveerstertje kernel: [ 72.958292] which lock already depends on the new lock.
Jan 26 11:36:10 serveerstertje kernel: [ 72.958292]
Jan 26 11:36:10 serveerstertje kernel: [ 72.976267]
Jan 26 11:36:10 serveerstertje kernel: [ 72.976267] the existing dependency chain (in reverse order) is:
Jan 26 11:36:10 serveerstertje kernel: [ 72.988276]
Jan 26 11:36:10 serveerstertje kernel: [ 72.988276] -> #1 (&port->mutex){+.+.+.}:
Jan 26 11:36:10 serveerstertje kernel: [ 73.000386] [<ffffffff81102dfd>] lock_acquire+0xcd/0x110
Jan 26 11:36:10 serveerstertje kernel: [ 73.006526] [<ffffffff81ad3f97>] mutex_lock_nested+0x47/0x560
Jan 26 11:36:10 serveerstertje kernel: [ 73.012612] [<ffffffff81518aa7>] tty_port_open+0x67/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.018637] [<ffffffff81aa4356>] rfcomm_tty_open+0x26/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.024674] [<ffffffff8150fcea>] tty_open+0x16a/0x5c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.030748] [<ffffffff811b4013>] chrdev_open+0xa3/0x1c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.036833] [<ffffffff811ad686>] do_dentry_open.isra.16+0x246/0x2f0
Jan 26 11:36:10 serveerstertje kernel: [ 73.043001] [<ffffffff811ad81d>] finish_open+0x1d/0x30
Jan 26 11:36:10 serveerstertje kernel: [ 73.049106] [<ffffffff811befae>] do_last+0x7ce/0xdf0
Jan 26 11:36:10 serveerstertje kernel: [ 73.055191] [<ffffffff811bf68d>] path_openat+0xbd/0x6b0
Jan 26 11:36:10 serveerstertje kernel: [ 73.061211] [<ffffffff811c004e>] do_filp_open+0x3e/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.067177] [<ffffffff811aeaec>] do_sys_open+0x13c/0x230
Jan 26 11:36:10 serveerstertje kernel: [ 73.073141] [<ffffffff811aebfd>] SyS_open+0x1d/0x20
Jan 26 11:36:10 serveerstertje kernel: [ 73.079047] [<ffffffff81ad6f39>] system_call_fastpath+0x16/0x1b
Jan 26 11:36:10 serveerstertje kernel: [ 73.084962]
Jan 26 11:36:10 serveerstertje kernel: [ 73.084962] -> #0 (&tty->legacy_mutex){+.+.+.}:
Jan 26 11:36:10 serveerstertje kernel: [ 73.096600] [<ffffffff8110230b>] __lock_acquire+0x1d4b/0x2220
Jan 26 11:36:10 serveerstertje kernel: [ 73.102559] [<ffffffff81102dfd>] lock_acquire+0xcd/0x110
Jan 26 11:36:10 serveerstertje kernel: [ 73.108475] [<ffffffff81ad3f97>] mutex_lock_nested+0x47/0x560
Jan 26 11:36:10 serveerstertje kernel: [ 73.114419] [<ffffffff81ad6344>] tty_lock_nested+0x44/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.120354] [<ffffffff81ad63ab>] tty_lock+0xb/0x10
Jan 26 11:36:10 serveerstertje kernel: [ 73.126258] [<ffffffff81aa4677>] rfcomm_dev_activate+0xb7/0x250
Jan 26 11:36:10 serveerstertje kernel: [ 73.132222] [<ffffffff81518ad7>] tty_port_open+0x97/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.138195] [<ffffffff81aa4356>] rfcomm_tty_open+0x26/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.144207] [<ffffffff8150fcea>] tty_open+0x16a/0x5c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.150164] [<ffffffff811b4013>] chrdev_open+0xa3/0x1c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.156127] [<ffffffff811ad686>] do_dentry_open.isra.16+0x246/0x2f0
Jan 26 11:36:10 serveerstertje kernel: [ 73.162070] [<ffffffff811ad81d>] finish_open+0x1d/0x30
Jan 26 11:36:10 serveerstertje kernel: [ 73.167933] [<ffffffff811befae>] do_last+0x7ce/0xdf0
Jan 26 11:36:10 serveerstertje kernel: [ 73.173787] [<ffffffff811bf68d>] path_openat+0xbd/0x6b0
Jan 26 11:36:10 serveerstertje kernel: [ 73.179600] [<ffffffff811c004e>] do_filp_open+0x3e/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.185302] [<ffffffff811aeaec>] do_sys_open+0x13c/0x230
Jan 26 11:36:10 serveerstertje kernel: [ 73.190880] [<ffffffff811aebfd>] SyS_open+0x1d/0x20
Jan 26 11:36:10 serveerstertje kernel: [ 73.196247] [<ffffffff81ad6f39>] system_call_fastpath+0x16/0x1b
Jan 26 11:36:10 serveerstertje kernel: [ 73.201486]
Jan 26 11:36:10 serveerstertje kernel: [ 73.201486] other info that might help us debug this:
Jan 26 11:36:10 serveerstertje kernel: [ 73.201486]
Jan 26 11:36:10 serveerstertje kernel: [ 73.216718] Possible unsafe locking scenario:
Jan 26 11:36:10 serveerstertje kernel: [ 73.216718]
Jan 26 11:36:10 serveerstertje kernel: [ 73.226933] CPU0 CPU1
Jan 26 11:36:10 serveerstertje kernel: [ 73.231978] ---- ----
Jan 26 11:36:10 serveerstertje kernel: [ 73.237001] lock(&port->mutex);
Jan 26 11:36:10 serveerstertje kernel: [ 73.241994] lock(&tty->legacy_mutex);
Jan 26 11:36:10 serveerstertje kernel: [ 73.247043] lock(&port->mutex);
Jan 26 11:36:10 serveerstertje kernel: [ 73.251999] lock(&tty->legacy_mutex);
Jan 26 11:36:10 serveerstertje kernel: [ 73.256902]
Jan 26 11:36:10 serveerstertje kernel: [ 73.256902] *** DEADLOCK ***
Jan 26 11:36:10 serveerstertje kernel: [ 73.256902]
Jan 26 11:36:10 serveerstertje kernel: [ 73.270890] 1 lock held by zabbix_slimmeme/5909:
Jan 26 11:36:10 serveerstertje kernel: [ 73.275398] #0: (&port->mutex){+.+.+.}, at: [<ffffffff81518aa7>] tty_port_open+0x67/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.280124]
Jan 26 11:36:10 serveerstertje kernel: [ 73.280124] stack backtrace:
Jan 26 11:36:10 serveerstertje kernel: [ 73.289130] CPU: 5 PID: 5909 Comm: zabbix_slimmeme Not tainted 3.13.0-20140125-mw-pcireset+ #1
Jan 26 11:36:10 serveerstertje kernel: [ 73.293860] Hardware name: MSI MS-7640/890FXA-GD70 (MS-7640) , BIOS V1.8B1 09/13/2010
Jan 26 11:36:10 serveerstertje kernel: [ 73.298625] ffffffff826e2b70 ffff88005858f818 ffffffff81acbcfa ffff880057c72300
Jan 26 11:36:10 serveerstertje kernel: [ 73.303571] ffffffff826e2b70 ffff88005858f868 ffffffff81ac7011 ffff880057c72300
Jan 26 11:36:10 serveerstertje kernel: [ 73.308511] ffff880057c72300 ffff88005858f868 ffff880057c72ac0 0000000000000000
Jan 26 11:36:10 serveerstertje kernel: [ 73.313325] Call Trace:
Jan 26 11:36:10 serveerstertje kernel: [ 73.318092] [<ffffffff81acbcfa>] dump_stack+0x46/0x58
Jan 26 11:36:10 serveerstertje kernel: [ 73.322900] [<ffffffff81ac7011>] print_circular_bug+0x2f6/0x32a
Jan 26 11:36:10 serveerstertje kernel: [ 73.327723] [<ffffffff8110230b>] __lock_acquire+0x1d4b/0x2220
Jan 26 11:36:10 serveerstertje kernel: [ 73.332545] [<ffffffff810fedbd>] ? trace_hardirqs_on+0xd/0x10
Jan 26 11:36:10 serveerstertje kernel: [ 73.337414] [<ffffffff810e6141>] ? finish_task_switch+0x41/0xf0
Jan 26 11:36:10 serveerstertje kernel: [ 73.342279] [<ffffffff81ad0244>] ? sleep_on_timeout+0x4/0x20
Jan 26 11:36:10 serveerstertje kernel: [ 73.347128] [<ffffffff81102dfd>] lock_acquire+0xcd/0x110
Jan 26 11:36:10 serveerstertje kernel: [ 73.351950] [<ffffffff81ad6344>] ? tty_lock_nested+0x44/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.356792] [<ffffffff81ad3f97>] mutex_lock_nested+0x47/0x560
Jan 26 11:36:10 serveerstertje kernel: [ 73.361599] [<ffffffff81ad6344>] ? tty_lock_nested+0x44/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.366363] [<ffffffff810fec6b>] ? trace_hardirqs_on_caller+0xfb/0x240
Jan 26 11:36:10 serveerstertje kernel: [ 73.371200] [<ffffffff810fedbd>] ? trace_hardirqs_on+0xd/0x10
Jan 26 11:36:10 serveerstertje kernel: [ 73.376030] [<ffffffff81ad6344>] tty_lock_nested+0x44/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.380842] [<ffffffff81ad63ab>] tty_lock+0xb/0x10
Jan 26 11:36:10 serveerstertje kernel: [ 73.385616] [<ffffffff81aa4677>] rfcomm_dev_activate+0xb7/0x250
Jan 26 11:36:10 serveerstertje kernel: [ 73.390398] [<ffffffff81ad4287>] ? mutex_lock_nested+0x337/0x560
Jan 26 11:36:10 serveerstertje kernel: [ 73.395154] [<ffffffff810f90f0>] ? __init_waitqueue_head+0x60/0x60
Jan 26 11:36:10 serveerstertje kernel: [ 73.399861] [<ffffffff81518ad7>] tty_port_open+0x97/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.404552] [<ffffffff81aa4356>] rfcomm_tty_open+0x26/0xe0
Jan 26 11:36:10 serveerstertje kernel: [ 73.409263] [<ffffffff8150fcea>] tty_open+0x16a/0x5c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.413954] [<ffffffff811b4013>] chrdev_open+0xa3/0x1c0
Jan 26 11:36:10 serveerstertje kernel: [ 73.418657] [<ffffffff81457bfd>] ? lockref_get+0x1d/0x30
Jan 26 11:36:10 serveerstertje kernel: [ 73.423379] [<ffffffff811b3f70>] ? cdev_put+0x30/0x30
Jan 26 11:36:10 serveerstertje kernel: [ 73.428056] [<ffffffff811ad686>] do_dentry_open.isra.16+0x246/0x2f0
Jan 26 11:36:10 serveerstertje kernel: [ 73.432768] [<ffffffff811ad81d>] finish_open+0x1d/0x30
Jan 26 11:36:10 serveerstertje kernel: [ 73.437464] [<ffffffff811befae>] do_last+0x7ce/0xdf0
Jan 26 11:36:10 serveerstertje kernel: [ 73.442166] [<ffffffff811baff3>] ? inode_permission+0x13/0x50
Jan 26 11:36:10 serveerstertje kernel: [ 73.446861] [<ffffffff811bb5ce>] ? link_path_walk+0x21e/0x880
Jan 26 11:36:10 serveerstertje kernel: [ 73.451533] [<ffffffff810fec6b>] ? trace_hardirqs_on_caller+0xfb/0x240
Jan 26 11:36:10 serveerstertje kernel: [ 73.456280] [<ffffffff811bf68d>] path_openat+0xbd/0x6b0
Jan 26 11:36:10 serveerstertje kernel: [ 73.461029] [<ffffffff8104cb03>] ? __do_page_fault+0x103/0x4e0
Jan 26 11:36:10 serveerstertje kernel: [ 73.465782] [<ffffffff81102e1d>] ? lock_acquire+0xed/0x110
Jan 26 11:36:10 serveerstertje kernel: [ 73.470553] [<ffffffff811c004e>] do_filp_open+0x3e/0xa0
Jan 26 11:36:10 serveerstertje kernel: [ 73.475321] [<ffffffff811cda31>] ? __alloc_fd+0xd1/0x120
Jan 26 11:36:10 serveerstertje kernel: [ 73.480064] [<ffffffff811aeaec>] do_sys_open+0x13c/0x230
Jan 26 11:36:10 serveerstertje kernel: [ 73.484743] [<ffffffff810fec6b>] ? trace_hardirqs_on_caller+0xfb/0x240
Jan 26 11:36:10 serveerstertje kernel: [ 73.489470] [<ffffffff811aebfd>] SyS_open+0x1d/0x20
Jan 26 11:36:10 serveerstertje kernel: [ 73.494191] [<ffffffff81ad6f39>] system_call_fastpath+0x16/0x1b
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