INFO: task syz-executor294:7495 blocked for more than 143 seconds.
Not tainted 5.1.0-rc5 #70
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor294 D29208 7495 7492 0x00000004
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_timeout+0x8ca/0xfd0 kernel/time/timer.c:1779
do_wait_for_common kernel/sched/completion.c:83 [inline]
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x29c/0x440 kernel/sched/completion.c:136
__io_uring_register+0xb6/0x1fd0 fs/io_uring.c:2929
__do_sys_io_uring_register fs/io_uring.c:2979 [inline]
__se_sys_io_uring_register fs/io_uring.c:2961 [inline]
__x64_sys_io_uring_register+0x193/0x1f0 fs/io_uring.c:2961
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445999
Code: e8 ec bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa97a70edb8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 0000000000445999
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffca279299f R14: 00007fa97a70f9c0 R15: 0000000000000000
INFO: task syz-executor294:7496 blocked for more than 143 seconds.
Not tainted 5.1.0-rc5 #70
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor294 D30336 7496 7492 0x00000004
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
__do_sys_io_uring_enter fs/io_uring.c:2678 [inline]
__se_sys_io_uring_enter fs/io_uring.c:2637 [inline]
__x64_sys_io_uring_enter+0x67f/0xac0 fs/io_uring.c:2637
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445999
Code: e8 ec bc 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fa97a6edda8 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000445999
RDX: 0000000000000002 RSI: 0000000000010005 RDI: 0000000000000003
RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 00000000006dbc3c
R13: 00007ffca279299f R14: 00007fa97a6ee9c0 R15: 0000000000000002
Showing all locks held in the system:
1 lock held by khungtaskd/1042:
#0: 00000000b5a861ba (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5056
1 lock held by rsyslogd/7378:
#0: 0000000007d2b1d3 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/7468:
#0: 000000009b3d70d7 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 0000000017139965 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7469:
#0: 000000001cc2b0a0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000cea7d2be (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7470:
#0: 00000000b87ea74b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 000000006ba52ac7 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7471:
#0: 00000000dffafc50 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 000000002e1535bf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7472:
#0: 00000000f9c6525d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000a676d4cd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7473:
#0: 00000000225242bf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000a095b648 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7474:
#0: 00000000bb203c70 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000661a9df8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
1 lock held by syz-executor294/7495:
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __do_sys_io_uring_register fs/io_uring.c:2978 [inline]
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __se_sys_io_uring_register fs/io_uring.c:2961 [inline]
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __x64_sys_io_uring_register+0x182/0x1f0 fs/io_uring.c:2961
1 lock held by syz-executor294/7496:
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __do_sys_io_uring_enter fs/io_uring.c:2678 [inline]
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __se_sys_io_uring_enter fs/io_uring.c:2637 [inline]
#0: 0000000041a2a57a (&ctx->uring_lock){+.+.}, at: __x64_sys_io_uring_enter+0x67f/0xac0 fs/io_uring.c:2637
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1042 Comm: khungtaskd Not tainted 5.1.0-rc5 #70
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 1 to CPUs 0: