INFO: task syz-executor5:9074 blocked for more than 120 seconds.
Not tainted 4.16.0-rc7+ #9
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5 D23952 9074 4505 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
schedule_timeout+0x1a3/0x230 kernel/time/timer.c:1777
do_wait_for_common kernel/sched/completion.c:86 [inline]
__wait_for_common kernel/sched/completion.c:107 [inline]
wait_for_common kernel/sched/completion.c:118 [inline]
wait_for_completion+0x415/0x770 kernel/sched/completion.c:139
ucma_destroy_id+0x2f0/0x500 drivers/infiniband/core/ucma.c:611
ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1656
__vfs_write+0xef/0x970 fs/read_write.c:480
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x455269
RSP: 002b:00007f13eb429c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f13eb42a6d4 RCX: 0000000000455269
RDX: 0000000000000018 RSI: 00000000200000c0 RDI: 0000000000000013
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000006b8 R14: 00000000006fc1e0 R15: 0000000000000000
Showing all locks held in the system:
2 locks held by khungtaskd/877:
#0: (rcu_read_lock){....}, at: [<00000000981d2c86>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000981d2c86>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<000000004bb3e173>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4333:
#0: (&f->f_pos_lock){+.+.}, at: [<00000000108dae14>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4423:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4424:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4425:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4426:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4427:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4428:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4429:
#0: (&tty->ldisc_sem){++++}, at: [<00000000f108380d>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000005e69cdcf>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 877 Comm: khungtaskd Not tainted 4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:raise_softirq_irqoff+0x61/0x320 kernel/softirq.c:416
RSP: 0018:ffff8801db107c90 EFLAGS: 00000086
RAX: ffffed003b620f93 RBX: 1ffff1003b620f93 RCX: dffffc0000000000
RDX: 1ffff1003b6259e2 RSI: 1ffff1003b620fc5 RDI: 0000000000000007
RBP: ffff8801db107d60 R08: 1ffff1003b6259d5 R09: ffff88021fff8048
R10: ffff88021fff8050 R11: ffff88021fff805d R12: 0000000000000007
R13: ffff8801db107d38 R14: ffff8801db107e68 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000002543000 CR3: 000000000846a005 CR4: 00000000001606e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
scheduler_ipi+0x50b/0x820 kernel/sched/core.c:1802
smp_reschedule_interrupt+0xe6/0x650 arch/x86/kernel/smp.c:277
reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:881
RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54
RSP: 0018:ffff8801d9b2fcb0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 1ffff1003b365f99 RCX: 0000000000000000
RDX: 1ffffffff10a24f0 RSI: 0000000000000001 RDI: ffffffff88512780
RBP: ffff8801d9b2fcb0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffff8801d9b2fd68 R14: ffffffff88ecfd20 R15: 0000000000000000
arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline]
default_idle+0xbf/0x430 arch/x86/kernel/process.c:354
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:345
default_idle_call+0x36/0x90 kernel/sched/idle.c:98
cpuidle_idle_call kernel/sched/idle.c:156 [inline]
do_idle+0x24a/0x3b0 kernel/sched/idle.c:246
cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:351
start_secondary+0x40a/0x590 arch/x86/kernel/smpboot.c:267
secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:239
Code: ff b3 8a b5 41 48 01 d8 48 c7 85 40 ff ff ff 51 42 08 88 48 c7 85 48 ff ff ff 30 50 43 81 c7 00 f1 f1 f1 f1 c7 40 04 00 f2 f2 f2 40 08 f2 f2 f2 f2 c7 40 0c 00 f2 f2 f2 c7 40 10 f3 f3 f3 f3