syzbot


INFO: task hung in pipe_release

Status: auto-closed as invalid on 2019/10/25 10:11
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 1371d, last: 1206d
similar bugs (6):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in pipe_release 1 1116d 1116d 0/1 auto-closed as invalid on 2019/11/24 16:38
upstream INFO: task hung in pipe_release (2) syz done 3 713d 744d 17/23 fixed on 2020/09/25 01:17
android-49 INFO: task hung in pipe_release (2) 1 1080d 1080d 0/3 auto-closed as invalid on 2019/12/30 22:08
android-49 INFO: task hung in pipe_release 2 1309d 1220d 0/3 auto-closed as invalid on 2019/07/14 20:38
upstream INFO: task hung in pipe_release (3) 4 273d 387d 0/23 closed as invalid on 2022/02/07 19:19
linux-4.19 INFO: task hung in pipe_release 1 509d 509d 0/1 auto-closed as invalid on 2021/07/23 11:59

Sample crash report:
INFO: task syz-executor.2:1492 blocked for more than 143 seconds.
      Not tainted 5.1.0-rc6+ #88
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28888  1492   8235 0x80000002
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x813/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3620
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 __pipe_lock fs/pipe.c:83 [inline]
 pipe_release+0x4e/0x280 fs/pipe.c:589
 __fput+0x2e5/0x8d0 fs/file_table.c:278
 ____fput+0x16/0x20 fs/file_table.c:309
 task_work_run+0x14a/0x1c0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x90a/0x2fa0 kernel/exit.c:876
 do_group_exit+0x135/0x370 kernel/exit.c:980
 get_signal+0x399/0x1d50 kernel/signal.c:2577
 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode+0x279/0x2e0 arch/x86/entry/common.c:197
 retint_user+0x8/0x18
RIP: 0033:0x458db5
Code: Bad RIP value.
RSP: 002b:0000000020000040 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000458da9
RDX: 0000000020000140 RSI: 0000000020000040 RDI: 0000000000020000
RBP: 000000000073bfa0 R08: 00000000200001c0 R09: 0000000000000000
R10: 0000000020000180 R11: 0000000000000246 R12: 00007f1c1b4db6d4
R13: 00000000004bf166 R14: 00000000004d01a0 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/1043:
 #0: 00000000a245ad74 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5057
1 lock held by rsyslogd/8045:
 #0: 00000000798cd85e (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/8189:
 #0: 00000000cccdaefe (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000047e835c5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8190:
 #0: 00000000d39e88c5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000000179327 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8191:
 #0: 00000000e56309cb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000008a2f5ac6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8192:
 #0: 000000008bfb6349 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 0000000093b4abe3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8193:
 #0: 000000002898cb2d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000002ad3cae5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8194:
 #0: 0000000098712ed0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000a2b5496c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/8195:
 #0: 00000000d9f82100 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000700a69d1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
3 locks held by kworker/u4:6/31211:
 #0: 00000000f7af183e (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:10082 [inline]
 #0: 00000000f7af183e (&rq->lock){-.-.}, at: pick_next_task_fair+0x1214/0x19a0 kernel/sched/fair.c:7091
 #1: 00000000a245ad74 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6088
 #2: 000000009fdddfe4 (&base->lock){-.-.}, at: lock_timer_base+0x56/0x1b0 kernel/time/timer.c:937
1 lock held by syz-executor.2/1470:
 #0: 00000000d2d6789f (&pipe->mutex/1){+.+.}, at: pipe_lock_nested fs/pipe.c:62 [inline]
 #0: 00000000d2d6789f (&pipe->mutex/1){+.+.}, at: pipe_lock+0x6e/0x80 fs/pipe.c:70
1 lock held by syz-executor.2/1492:
 #0: 00000000d2d6789f (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:83 [inline]
 #0: 00000000d2d6789f (&pipe->mutex/1){+.+.}, at: pipe_release+0x4e/0x280 fs/pipe.c:589

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1043 Comm: khungtaskd Not tainted 5.1.0-rc6+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0x9b7/0xec0 kernel/hung_task.c:288
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12246 Comm: syz-executor.0 Not tainted 5.1.0-rc6+ #88
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:1387 [inline]
RIP: 0010:__hrtimer_run_queues+0x2d7/0xde0 kernel/time/hrtimer.c:1451
Code: 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 16 0a 00 00 49 8b 46 28 48 8b b5 38 ff ff ff 48 8b bd 70 ff ff ff 48 89 85 48 ff ff ff <e8> b4 3b af 05 0f 1f 44 00 00 e8 ca 05 0f 00 e8 c5 05 0f 00 65 8b
RSP: 0018:ffff8880ae907a68 EFLAGS: 00000046
RAX: ffffffff81852850 RBX: 0000000000000000 RCX: ffffffff816166a2
RDX: 0000000000010100 RSI: 0000000000000086 RDI: ffff8880ae925d00
RBP: ffff8880ae907b58 R08: ffff8880a8620680 R09: ffffed1015d25bc8
R10: ffffed1015d25bc7 R11: ffff8880ae92de3b R12: ffff8880ae925d80
R13: 000000abf44eb9e9 R14: ffff88805dc80b18 R15: dffffc0000000000
FS:  00007f3ee073a700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e621000 CR3: 00000000901a0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
RIP: 0010:__sanitizer_cov_trace_const_cmp1+0x1/0x20 kernel/kcov.c:175
Code: c3 0f 1f 84 00 00 00 00 00 55 48 89 f2 48 89 fe bf 06 00 00 00 48 89 e5 48 8b 4d 08 e8 18 ff ff ff 5d c3 66 0f 1f 44 00 00 55 <40> 0f b6 d6 40 0f b6 f7 bf 01 00 00 00 48 89 e5 48 8b 4d 08 e8 f6
RSP: 0018:ffff8880ae907d08 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a8620680 RBX: ffffffff8b02e240 RCX: ffffffff8160bd8b
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff8880ae907dd8 R08: ffff8880a8620680 R09: ffffffff895e6b14
R10: ffff8880a8620f28 R11: ffff8880a8620680 R12: 0000000000000100
R13: ffff8880ae907db0 R14: 1ffff11015d20fa6 R15: 0000000000000001
 expire_timers kernel/time/timer.c:1362 [inline]
 __run_timers kernel/time/timer.c:1681 [inline]
 __run_timers kernel/time/timer.c:1649 [inline]
 run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694
 __do_softirq+0x266/0x95a kernel/softirq.c:293
 invoke_softirq kernel/softirq.c:374 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:414
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:proc_pident_instantiate+0x221/0x2a0 fs/proc/base.c:2437
Code: 89 ee e8 32 8a e4 ff 49 89 c4 e8 ca 43 9d ff 4c 89 e0 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 49 c7 c4 fe ff ff ff eb e0 <e8> aa 43 9d ff be 02 00 00 00 4c 89 e7 e8 dd 56 e5 ff e9 a0 fe ff
RSP: 0018:ffff88805a4df650 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: ffffffff87770738 RCX: ffffffff81d347ac
RDX: 0000000000004000 RSI: 0000000000004000 RDI: 0000000000000003
RBP: ffff88805a4df680 R08: ffff8880a8620680 R09: ffffed1011dfa5ec
R10: ffffed1011dfa5eb R11: ffff88808efd2f5b R12: ffff888094b36b58
R13: ffff88809843a000 R14: ffff88805c956380 R15: 0000000000004000
 proc_pident_lookup+0x1ad/0x210 fs/proc/base.c:2467
 proc_tgid_base_lookup+0x2c/0x40 fs/proc/base.c:3089
 __lookup_slow+0x27e/0x500 fs/namei.c:1669
 lookup_slow+0x58/0x80 fs/namei.c:1686
 walk_component+0x74b/0x2000 fs/namei.c:1808
 link_path_walk.part.0+0x980/0x1340 fs/namei.c:2139
 link_path_walk fs/namei.c:2070 [inline]
 path_openat+0x202/0x46e0 fs/namei.c:3532
 do_filp_open+0x1a1/0x280 fs/namei.c:3563
 do_sys_open+0x3fe/0x5d0 fs/open.c:1069
 __do_sys_open fs/open.c:1087 [inline]
 __se_sys_open fs/open.c:1082 [inline]
 __x64_sys_open+0x7e/0xc0 fs/open.c:1082
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x412d41
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 2a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 73 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007f3ee0739bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000412d41
RDX: 00007f3ee0739be3 RSI: 0000000000000002 RDI: 00007f3ee0739bd0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000013
R10: 0000000000000008 R11: 0000000000000293 R12: 00007f3ee073a6d4
R13: 00000000004c7d53 R14: 00000000004dde50 R15: 00000000ffffffff

Crashes (2):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2019/04/28 12:22 upstream 037904a22bf8 b617407b .config log report
ci-upstream-net-kasan-gce 2018/11/15 03:06 net-next 15cef30974c5 5f5f6d14 .config log report