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Subjectlockdep: irq lock inversion dependency
hi,

today this appeared on s390 running 2.6.32.7:
[21767.804859] =========================================================
[21767.804871] [ INFO: possible irq lock inversion dependency detected ]
[21767.804877] 2.6.32.7 #2
[21767.804882] ---------------------------------------------------------
[21767.804887] swapper/0 just changed the state of lock:
[21767.804893] (&sighand->siglock){-.-.-.}, at: [<000000000016af86>] lock_task_sighand+0x7e/0xfc
[21767.804917] but this lock took another, SOFTIRQ-READ-unsafe lock in the past:
[21767.804925] (&f->f_owner.lock){.+.+..}
[21767.804932]
[21767.804933] and interrupts could create inverse lock ordering between them.
[21767.804934]
[21767.804953]
[21767.804954] other info that might help us debug this:
[21767.804968] 2 locks held by swapper/0:
[21767.804976] #0: (rcu_read_lock){.+.+..}, at: [<000000000016c128>] kill_pid_info+0x0/0xe8
[21767.805002] #1: (rcu_read_lock){.+.+..}, at: [<000000000016af08>] lock_task_sighand+0x0/0xfc
[21767.805030]
[21767.805030] the shortest dependencies between 2nd lock and 1st lock:
[21767.805066] -> (&f->f_owner.lock){.+.+..} ops: 12296491368448 {
[21767.805074] HARDIRQ-ON-R at:
[21767.805078] [<0000000000193bde>] __lock_acquire+0x38e/0x192c
[21767.805088] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805094] [<000000000058bafa>] _read_lock+0x5a/0x98
[21767.805104] [<00000000002507ba>] f_getown+0x36/0x6c
[21767.805112] [<0000000000250fc0>] SyS_fcntl+0x590/0x698
[21767.805119] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805128] [<0000004467253b48>] 0x4467253b48
[21767.805141] SOFTIRQ-ON-R at:
[21767.805145] [<0000000000194464>] __lock_acquire+0xc14/0x192c
[21767.805151] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805191] [<000000000058bafa>] _read_lock+0x5a/0x98
[21767.805197] [<00000000002507ba>] f_getown+0x36/0x6c
[21767.805203] [<0000000000250fc0>] SyS_fcntl+0x590/0x698
[21767.805209] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805215] [<0000004467253b48>] 0x4467253b48
[21767.805230] INITIAL USE at:
[21767.805239] [<0000000000193a5e>] __lock_acquire+0x20e/0x192c
[21767.805251] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805265] [<000000000058bafa>] _read_lock+0x5a/0x98
[21767.805279] [<00000000002507ba>] f_getown+0x36/0x6c
[21767.805294] [<0000000000250fc0>] SyS_fcntl+0x590/0x698
[21767.805312] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805318] [<0000004467253b48>] 0x4467253b48
[21767.805324] }
[21767.805326] ... key at: [<00000000013abc18>] __key.23635+0x0/0x8
[21767.805334] ... acquired at:
[21767.805336] [<0000000000194850>] __lock_acquire+0x1000/0x192c
[21767.805352] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805361] [<000000000058b7a2>] _write_lock_irqsave+0x6a/0xb4
[21767.805372] [<0000000000250832>] f_modown+0x42/0xe4
[21767.805383] [<0000000000250938>] __f_setown+0x50/0x64
[21767.805394] [<00000000003b7e9c>] tty_fasync+0xe4/0x154
[21767.805410] [<0000000000250f5e>] SyS_fcntl+0x52e/0x698
[21767.805423] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805437] [<0000004467253b48>] 0x4467253b48
[21767.805450]
[21767.805458] -> (&tty->ctrl_lock){......} ops: 8233452306432 {
[21767.805485] INITIAL USE at:
[21767.805499] [<0000000000193a5e>] __lock_acquire+0x20e/0x192c
[21767.805519] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805525] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.805532] [<00000000003b8466>] __proc_set_tty+0x3e/0x158
[21767.805538] [<00000000003bac2a>] tty_ioctl+0x7ae/0xa68
[21767.805543] [<00000000002515f6>] vfs_ioctl+0x4e/0xdc
[21767.805549] [<0000000000251ae4>] do_vfs_ioctl+0x388/0x5bc
[21767.805555] [<0000000000251dc0>] SyS_ioctl+0xa8/0xb0
[21767.805561] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805567] [<00000044670bdb46>] 0x44670bdb46
[21767.805572] }
[21767.805574] ... key at: [<00000000014d0c18>] __key.25620+0x0/0x8
[21767.805583] ... acquired at:
[21767.805586] [<0000000000194850>] __lock_acquire+0x1000/0x192c
[21767.805591] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805674] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.805680] [<00000000003b8466>] __proc_set_tty+0x3e/0x158
[21767.805687] [<00000000003bac2a>] tty_ioctl+0x7ae/0xa68
[21767.805694] [<00000000002515f6>] vfs_ioctl+0x4e/0xdc
[21767.805702] [<0000000000251ae4>] do_vfs_ioctl+0x388/0x5bc
[21767.805711] [<0000000000251dc0>] SyS_ioctl+0xa8/0xb0
[21767.805720] [<0000000000118f1e>] sysc_noemu+0x10/0x16
[21767.805730] [<00000044670bdb46>] 0x44670bdb46
[21767.805740]
[21767.805746] -> (&sighand->siglock){-.-.-.} ops: 902754880978944 {
[21767.805766] IN-HARDIRQ-W at:
[21767.805776] [<0000000000194320>] __lock_acquire+0xad0/0x192c
[21767.805790] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805805] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.805820] [<000000000016af86>] lock_task_sighand+0x7e/0xfc
[21767.805838] [<000000000016bcb8>] do_send_sig_info+0x3c/0xa0
[21767.805844] [<000000000016c1b2>] kill_pid_info+0x8a/0xe8
[21767.805850] [<00000000001595b6>] it_real_fn+0xce/0xec
[21767.805858] [<000000000017d92a>] __run_hrtimer+0x19a/0x2c8
[21767.805868] [<000000000017dd2e>] hrtimer_interrupt+0x102/0x1f4
[21767.805874] [<0000000000107ca0>] clock_comparator_work+0x60/0x68
[21767.805897] [<000000000010f02c>] do_extint+0x18c/0x190
[21767.805911] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.805926] [<00000000001164f8>] vtime_stop_cpu+0xac/0x100
[21767.805942] IN-SOFTIRQ-W at:
[21767.805955] [<0000000000194060>] __lock_acquire+0x810/0x192c
[21767.805973] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.805979] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.805985] [<000000000016af86>] lock_task_sighand+0x7e/0xfc
[21767.805991] [<000000000016bcb8>] do_send_sig_info+0x3c/0xa0
[21767.805997] [<000000000016c1b2>] kill_pid_info+0x8a/0xe8
[21767.806012] [<00000000001595b6>] it_real_fn+0xce/0xec
[21767.806024] [<000000000017d92a>] __run_hrtimer+0x19a/0x2c8
[21767.806037] [<000000000017dd2e>] hrtimer_interrupt+0x102/0x1f4
[21767.806050] [<0000000000107ca0>] clock_comparator_work+0x60/0x68
[21767.806066] [<000000000010f02c>] do_extint+0x18c/0x190
[21767.806082] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.806098] [<000000000058afa4>] _spin_unlock_irqrestore+0x9c/0xa0
[21767.806104] [<000000000058af9a>] _spin_unlock_irqrestore+0x92/0xa0
[21767.806110] [<00000000001c1f28>] __rcu_process_callbacks+0x3a0/0x3c4
[21767.806120] [<00000000001c1fa0>] rcu_process_callbacks+0x54/0x8c
[21767.806135] [<000000000015ce24>] __do_softirq+0x184/0x2e8
[21767.806147] [<0000000000111f68>] do_softirq+0xe4/0xe8
[21767.806160] [<000000000015c814>] irq_exit+0xc0/0xe0
[21767.806173] [<000000000010efe6>] do_extint+0x146/0x190
[21767.806188] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.806204] [<00000000001164f8>] vtime_stop_cpu+0xac/0x100
[21767.806222] IN-RECLAIM_FS-W at:
[21767.806226] [<000000000019433c>] __lock_acquire+0xaec/0x192c
[21767.806232] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.806238] [<000000000058b3a8>] _spin_lock_irq+0x64/0xa8
[21767.806244] [<0000000000184032>] refrigerator+0xae/0x15c
[21767.806263] [<00000000001fe066>] kswapd+0x736/0x74c
[21767.806276] [<00000000001796c4>] kthread+0x9c/0xa4
[21767.806289] [<000000000010a5d2>] kernel_thread_starter+0x6/0xc
[21767.806303] [<000000000010a5cc>] kernel_thread_starter+0x0/0xc
[21767.806318] INITIAL USE at:
[21767.806330] [<0000000000193a5e>] __lock_acquire+0x20e/0x192c
[21767.806347] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.806362] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.806368] [<000000000016b1aa>] flush_signals+0x32/0x5c
[21767.806373] [<000000000017950e>] kthreadd+0x4a/0x164
[21767.806379] [<000000000010a5d2>] kernel_thread_starter+0x6/0xc
[21767.806385] [<000000000010a5cc>] kernel_thread_starter+0x0/0xc
[21767.806391] }
[21767.806393] ... key at: [<0000000000a88244>] __key.39171+0x0/0x8
[21767.806419] ... acquired at:
[21767.806427] [<0000000000192e0e>] check_usage_forwards+0xde/0x134
[21767.806439] [<0000000000191c5c>] mark_lock+0x50c/0x648
[21767.806452] [<0000000000194060>] __lock_acquire+0x810/0x192c
[21767.806466] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.806481] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.806496] [<000000000016af86>] lock_task_sighand+0x7e/0xfc
[21767.806514] [<000000000016bcb8>] do_send_sig_info+0x3c/0xa0
[21767.806519] [<000000000016c1b2>] kill_pid_info+0x8a/0xe8
[21767.806524] [<00000000001595b6>] it_real_fn+0xce/0xec
[21767.806529] [<000000000017d92a>] __run_hrtimer+0x19a/0x2c8
[21767.806535] [<000000000017dd2e>] hrtimer_interrupt+0x102/0x1f4
[21767.806549] [<0000000000107ca0>] clock_comparator_work+0x60/0x68
[21767.806558] [<000000000010f02c>] do_extint+0x18c/0x190
[21767.806568] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.806578] [<000000000058afa4>] _spin_unlock_irqrestore+0x9c/0xa0
[21767.806590] [<000000000058af9a>] _spin_unlock_irqrestore+0x92/0xa0
[21767.806602] [<00000000001c1f28>] __rcu_process_callbacks+0x3a0/0x3c4
[21767.806615] [<00000000001c1fa0>] rcu_process_callbacks+0x54/0x8c
[21767.806628] [<000000000015ce24>] __do_softirq+0x184/0x2e8
[21767.806642] [<0000000000111f68>] do_softirq+0xe4/0xe8
[21767.806656] [<000000000015c814>] irq_exit+0xc0/0xe0
[21767.806671] [<000000000010efe6>] do_extint+0x146/0x190
[21767.806959] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.806964] [<00000000001164f8>] vtime_stop_cpu+0xac/0x100
[21767.806970]
[21767.806972]
[21767.806973] stack backtrace:
[21767.806977] CPU: 0 Not tainted 2.6.32.7 #2
[21767.806981] Process swapper (pid: 0, task: 0000000000810d18, ksp: 0000000000807da0)
[21767.806985] 0000000000000000 000000003fedf4f0 0000000000000002 0000000000000000
[21767.806992] 000000003fedf590 000000003fedf508 000000003fedf508 0000000000586638
[21767.807016] 0000000000000001 0000000000000001 0000000000000006 0000000000000000
[21767.807036] 000000000000000d 0000000000000000 000000003fedf560 000000000000000e
[21767.807057] 000000000059ef38 0000000000105670 000000003fedf4f0 000000003fedf538
[21767.807083] Call Trace:
[21767.807092] ([<00000000001055be>] show_trace+0x142/0x148)
[21767.807106] [<0000000000192d16>] print_irq_inversion_bug+0x13a/0x154
[21767.807121] [<0000000000192e0e>] check_usage_forwards+0xde/0x134
[21767.807136] [<0000000000191c5c>] mark_lock+0x50c/0x648
[21767.807151] [<0000000000194060>] __lock_acquire+0x810/0x192c
[21767.807156] [<00000000001952cc>] lock_acquire+0x150/0x180
[21767.807161] [<000000000058b456>] _spin_lock_irqsave+0x6a/0xb4
[21767.807166] [<000000000016af86>] lock_task_sighand+0x7e/0xfc
[21767.807171] [<000000000016bcb8>] do_send_sig_info+0x3c/0xa0
[21767.807185] [<000000000016c1b2>] kill_pid_info+0x8a/0xe8
[21767.807194] [<00000000001595b6>] it_real_fn+0xce/0xec
[21767.807203] [<000000000017d92a>] __run_hrtimer+0x19a/0x2c8
[21767.807214] [<000000000017dd2e>] hrtimer_interrupt+0x102/0x1f4
[21767.807225] [<0000000000107ca0>] clock_comparator_work+0x60/0x68
[21767.807237] [<000000000010f02c>] do_extint+0x18c/0x190
[21767.807249] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.807262] [<000000000058afa4>] _spin_unlock_irqrestore+0x9c/0xa0
[21767.807276] ([<000000000058af9a>] _spin_unlock_irqrestore+0x92/0xa0)
[21767.807291] [<00000000001c1f28>] __rcu_process_callbacks+0x3a0/0x3c4
[21767.807306] [<00000000001c1fa0>] rcu_process_callbacks+0x54/0x8c
[21767.807320] [<000000000015ce24>] __do_softirq+0x184/0x2e8
[21767.807325] [<0000000000111f68>] do_softirq+0xe4/0xe8
[21767.807330] [<000000000015c814>] irq_exit+0xc0/0xe0
[21767.807335] [<000000000010efe6>] do_extint+0x146/0x190
[21767.807340] [<000000000011974c>] ext_no_vtime+0x1e/0x22
[21767.807352] [<00000000001164f8>] vtime_stop_cpu+0xac/0x100
[21767.807362] ([<000000000011649e>] vtime_stop_cpu+0x52/0x100)
[21767.807371] [<000000000010abfc>] cpu_idle+0xf8/0x194
[21767.807382] [<0000000000870c38>] start_kernel+0x390/0x3f4
[21767.807395] [<0000000000100020>] _stext+0x20/0x80
[21767.807406] INFO: lockdep is turned off.

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