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Subject[2.6.32.6] tty: possible irq lock inversion dependency in tty_fasync
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Date
Hello.

I got this on 2.6.32.6 .
Config is at http://I-love.SAKURA.ne.jp/tmp/config-2.6.32.6

# cat /proc/version
Linux version 2.6.32.6 (root@tomoyo) (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Tue Jan 26 11:35:08 JST 2010
# cat /proc/cmdline
root=/dev/sda1 ro ramdisk=16384 console=ttyS0,115200n8 console=tty kmemleak=off
# dmesg
=========================================================
[ INFO: possible irq lock inversion dependency detected ]
2.6.32.6 #1
---------------------------------------------------------
swapper/0 just changed the state of lock:
(&sighand->siglock){-.....}, at: [<c10515bd>] lock_task_sighand+0x5d/0xa0
but this lock took another, HARDIRQ-unsafe lock in the past:
(&tty->ctrl_lock){+.+...}

and interrupts could create inverse lock ordering between them.


other info that might help us debug this:
2 locks held by swapper/0:
#0: (rcu_read_lock){.+.+..}, at: [<c10516c0>] kill_pid_info+0x0/0x90
#1: (rcu_read_lock){.+.+..}, at: [<c1051560>] lock_task_sighand+0x0/0xa0

the shortest dependencies between 2nd lock and 1st lock:
-> (&tty->ctrl_lock){+.+...} ops: 97 {
HARDIRQ-ON-W at:
[<c106e5e2>] mark_held_locks+0x42/0x80
[<c106e6e6>] trace_hardirqs_on_caller+0xa6/0x160
[<c106e7ab>] trace_hardirqs_on+0xb/0x10
[<c1343487>] _write_unlock_irq+0x27/0x30
[<c10e517b>] f_modown+0x6b/0x80
[<c10e51d1>] __f_setown+0x41/0x50
[<c11e5e8c>] tty_fasync+0xbc/0x110
[<c10e50d8>] setfl+0x118/0x150
[<c10e557f>] do_fcntl+0xcf/0x1e0
[<c10e5788>] sys_fcntl64+0x88/0xa0
[<c1002f99>] syscall_call+0x7/0xb
SOFTIRQ-ON-W at:
[<c106e5e2>] mark_held_locks+0x42/0x80
[<c106e737>] trace_hardirqs_on_caller+0xf7/0x160
[<c106e7ab>] trace_hardirqs_on+0xb/0x10
[<c1343487>] _write_unlock_irq+0x27/0x30
[<c10e517b>] f_modown+0x6b/0x80
[<c10e51d1>] __f_setown+0x41/0x50
[<c11e5e8c>] tty_fasync+0xbc/0x110
[<c10e50d8>] setfl+0x118/0x150
[<c10e557f>] do_fcntl+0xcf/0x1e0
[<c10e5788>] sys_fcntl64+0x88/0xa0
[<c1002f99>] syscall_call+0x7/0xb
INITIAL USE at:
[<c106f6f4>] __lock_acquire+0x1b4/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c11e7427>] __proc_set_tty+0x27/0xf0
[<c11e751f>] proc_set_tty+0x2f/0x50
[<c11e62cd>] tiocsctty+0xed/0x100
[<c11e6998>] tty_ioctl+0x1b8/0x320
[<c10e5e24>] vfs_ioctl+0x74/0x90
[<c10e6a90>] do_vfs_ioctl+0x60/0x1a0
[<c10e6c1f>] sys_ioctl+0x4f/0x70
[<c1002f99>] syscall_call+0x7/0xb
}
... key at: [<c1d31c5c>] __key.13+0x0/0x8
... acquired at:
[<c106cfa2>] check_prev_add+0x212/0x7e0
[<c106d614>] check_prevs_add+0xa4/0x100
[<c106d99a>] validate_chain+0x2fa/0x520
[<c106f7e1>] __lock_acquire+0x2a1/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c11e7427>] __proc_set_tty+0x27/0xf0
[<c11e751f>] proc_set_tty+0x2f/0x50
[<c11e62cd>] tiocsctty+0xed/0x100
[<c11e6998>] tty_ioctl+0x1b8/0x320
[<c10e5e24>] vfs_ioctl+0x74/0x90
[<c10e6a90>] do_vfs_ioctl+0x60/0x1a0
[<c10e6c1f>] sys_ioctl+0x4f/0x70
[<c1002f99>] syscall_call+0x7/0xb

-> (&sighand->siglock){-.....} ops: 118136 {
IN-HARDIRQ-W at:
[<c106ec48>] mark_irqflags+0x168/0x180
[<c106f8bc>] __lock_acquire+0x37c/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c10515bd>] lock_task_sighand+0x5d/0xa0
[<c10513e1>] do_send_sig_info+0x31/0x70
[<c1051646>] group_send_sig_info+0x46/0x50
[<c1051726>] kill_pid_info+0x66/0x90
[<c10456d8>] it_real_fn+0x38/0x80
[<c105ef9f>] __run_hrtimer+0x7f/0x160
[<c105f11e>] hrtimer_run_queues+0x8e/0xb0
[<c104fa0d>] run_local_timers+0xd/0x20
[<c104f724>] update_process_times+0x34/0x60
[<c1068afa>] tick_periodic+0x2a/0x80
[<c1068b6e>] tick_handle_periodic+0x1e/0x80
[<c101880d>] local_apic_timer_interrupt+0x5d/0x60
[<c1343923>] smp_apic_timer_interrupt+0x33/0x42
[<c10038bb>] apic_timer_interrupt+0x2f/0x34
[<c10015ea>] cpu_idle+0x6a/0xc0
[<c132e168>] rest_init+0x58/0x60
[<c15129c6>] start_kernel+0x206/0x290
[<c1512095>] i386_start_kernel+0x65/0xa0
INITIAL USE at:
[<c106f6f4>] __lock_acquire+0x1b4/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c1050514>] flush_signals+0x24/0x50
[<c105068c>] ignore_signals+0x3c/0x40
[<c105b726>] kthreadd+0x26/0xd0
[<c1003a77>] kernel_thread_helper+0x7/0x10
}
... key at: [<c17130d8>] __key.12+0x0/0x8
... acquired at:
[<c106e0f8>] check_usage_forwards+0x78/0xe0
[<c106e3f9>] mark_lock_irq+0x99/0x240
[<c106eeb6>] mark_lock+0x1d6/0x370
[<c106ec48>] mark_irqflags+0x168/0x180
[<c106f8bc>] __lock_acquire+0x37c/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c10515bd>] lock_task_sighand+0x5d/0xa0
[<c10513e1>] do_send_sig_info+0x31/0x70
[<c1051646>] group_send_sig_info+0x46/0x50
[<c1051726>] kill_pid_info+0x66/0x90
[<c10456d8>] it_real_fn+0x38/0x80
[<c105ef9f>] __run_hrtimer+0x7f/0x160
[<c105f11e>] hrtimer_run_queues+0x8e/0xb0
[<c104fa0d>] run_local_timers+0xd/0x20
[<c104f724>] update_process_times+0x34/0x60
[<c1068afa>] tick_periodic+0x2a/0x80
[<c1068b6e>] tick_handle_periodic+0x1e/0x80
[<c101880d>] local_apic_timer_interrupt+0x5d/0x60
[<c1343923>] smp_apic_timer_interrupt+0x33/0x42
[<c10038bb>] apic_timer_interrupt+0x2f/0x34
[<c10015ea>] cpu_idle+0x6a/0xc0
[<c132e168>] rest_init+0x58/0x60
[<c15129c6>] start_kernel+0x206/0x290
[<c1512095>] i386_start_kernel+0x65/0xa0


stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.32.6 #1
Call Trace:
[<c1041b7d>] ? printk+0x1d/0x30
[<c106e068>] print_irq_inversion_bug+0x108/0x120
[<c106e0f8>] check_usage_forwards+0x78/0xe0
[<c106e3f9>] mark_lock_irq+0x99/0x240
[<c106e080>] ? check_usage_forwards+0x0/0xe0
[<c106eeb6>] mark_lock+0x1d6/0x370
[<c106e7d0>] ? trace_hardirqs_off_caller+0x20/0xc0
[<c106ec48>] mark_irqflags+0x168/0x180
[<c106f8bc>] __lock_acquire+0x37c/0x8a0
[<c106f81c>] ? __lock_acquire+0x2dc/0x8a0
[<c1070ddd>] lock_acquire+0x7d/0xe0
[<c10515bd>] ? lock_task_sighand+0x5d/0xa0
[<c1342af9>] _spin_lock_irqsave+0x49/0x90
[<c10515bd>] ? lock_task_sighand+0x5d/0xa0
[<c10515bd>] lock_task_sighand+0x5d/0xa0
[<c1051560>] ? lock_task_sighand+0x0/0xa0
[<c10513e1>] do_send_sig_info+0x31/0x70
[<c1051646>] group_send_sig_info+0x46/0x50
[<c1051726>] kill_pid_info+0x66/0x90
[<c10516c0>] ? kill_pid_info+0x0/0x90
[<c105ef91>] ? __run_hrtimer+0x71/0x160
[<c10456d8>] it_real_fn+0x38/0x80
[<c105ef9f>] __run_hrtimer+0x7f/0x160
[<c1342fb3>] ? _spin_lock+0x53/0x80
[<c10456a0>] ? it_real_fn+0x0/0x80
[<c105f11e>] hrtimer_run_queues+0x8e/0xb0
[<c104fa0d>] run_local_timers+0xd/0x20
[<c104f724>] update_process_times+0x34/0x60
[<c1068afa>] tick_periodic+0x2a/0x80
[<c1068b6e>] tick_handle_periodic+0x1e/0x80
[<c101880d>] local_apic_timer_interrupt+0x5d/0x60
[<c1343923>] smp_apic_timer_interrupt+0x33/0x42
[<c10038bb>] apic_timer_interrupt+0x2f/0x34
[<c100a902>] ? default_idle+0x42/0xa0
[<c10015ea>] cpu_idle+0x6a/0xc0
[<c132e168>] rest_init+0x58/0x60
[<c15129c6>] start_kernel+0x206/0x290
[<c15122c0>] ? unknown_bootoption+0x0/0x130
[<c1512095>] i386_start_kernel+0x65/0xa0



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