INFO: task syz-executor.2:19458 blocked for more than 143 seconds.
Not tainted 5.4.0-rc1+ #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2 D28480 19458 7898 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3384 [inline]
__schedule+0x74b/0xb80 kernel/sched/core.c:4069
schedule+0x131/0x1e0 kernel/sched/core.c:4136
schedule_timeout+0x46/0x240 kernel/time/timer.c:1871
do_wait_for_common+0x2e7/0x4d0 kernel/sched/completion.c:83
__wait_for_common kernel/sched/completion.c:104 [inline]
wait_for_common kernel/sched/completion.c:115 [inline]
wait_for_completion+0x47/0x60 kernel/sched/completion.c:136
flush_workqueue+0x60d/0x14b0 kernel/workqueue.c:2826
nbd_start_device_ioctl drivers/block/nbd.c:1272 [inline]
__nbd_ioctl drivers/block/nbd.c:1347 [inline]
nbd_ioctl+0x9d2/0xac0 drivers/block/nbd.c:1387
__blkdev_driver_ioctl block/ioctl.c:304 [inline]
blkdev_ioctl+0x807/0x2980 block/ioctl.c:606
block_ioctl+0xbd/0x100 fs/block_dev.c:1954
do_vfs_ioctl+0x744/0x1730 fs/ioctl.c:46
ksys_ioctl fs/ioctl.c:713 [inline]
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0xe3/0x120 fs/ioctl.c:718
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <90> 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00007f0c934a6c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000459a59
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0c934a76d4
R13: 00000000004c33a9 R14: 00000000004d6fc0 R15: 00000000ffffffff
Showing all locks held in the system:
1 lock held by khungtaskd/1064:
#0: ffffffff888d3ec0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207
1 lock held by rsyslogd/7764:
#0: ffff88808e417660 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801
2 locks held by getty/7854:
#0: ffff8880a3404ad0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f452e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7855:
#0: ffff888097f48a90 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f312e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7856:
#0: ffff888097284b10 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f3d2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7857:
#0: ffff8880a9292a10 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7858:
#0: ffff88809a5eb3d0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f492e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7859:
#0: ffff8880a9293290 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by getty/7860:
#0: ffff888097f386d0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272
#1: ffffc90005f192e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156
2 locks held by kworker/u5:2/16976:
#0: ffff8880a083c6e8 ((wq_completion)knbd2-recv){+.+.}, at: spin_unlock_irq include/linux/spinlock.h:388 [inline]
#0: ffff8880a083c6e8 ((wq_completion)knbd2-recv){+.+.}, at: process_one_work+0x75d/0x10e0 kernel/workqueue.c:2242
#1: ffff888049577d78 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x79f/0x10e0 kernel/workqueue.c:2244
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1064 Comm: khungtaskd Not tainted 5.4.0-rc1+ #0
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+0x1d8/0x2f8 lib/dump_stack.c:113
nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146
check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
watchdog+0xbb9/0xbd0 kernel/hung_task.c:289
kthread+0x332/0x350 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc1+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:68 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x50 kernel/kcov.c:102
Code: e5 53 48 89 fb e8 13 00 00 00 48 8b 3d 04 0d 4b 07 48 89 de e8 94 c6 38 00 5b 5d c3 90 48 8b 04 24 65 48 8b 0c 25 c0 fd 01 00 <65> 8b 15 48 cb 8e 7e f7 c2 00 01 1f 00 75 2c 8b 91 f8 12 00 00 83
RSP: 0018:ffff8880aeb09d30 EFLAGS: 00000202
RAX: ffffffff83421ecf RBX: 0000000000000002 RCX: ffff8880a98c2340
RDX: ffff8880a98c2340 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8880aeb09d68 R08: ffffffff83421ec5 R09: ffffed1015d6693d
R10: ffffed1015d6693d R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000040 R15: ffffffff88fa8a00
FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c43ad33000 CR3: 00000000a0eee000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
cpumask_next+0x4a/0x60 lib/cpumask.c:22
_nohz_idle_balance+0x92/0x530 kernel/sched/fair.c:9589
nohz_idle_balance kernel/sched/fair.c:9681 [inline]
run_rebalance_domains+0x165/0x290 kernel/sched/fair.c:9865
__do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:766
invoke_softirq kernel/softirq.c:373 [inline]
irq_exit+0x227/0x230 kernel/softirq.c:413
scheduler_ipi+0x444/0x4a0 kernel/sched/core.c:2347
smp_reschedule_interrupt+0x7a/0xa0 arch/x86/kernel/smp.c:244
reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:854
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 3a fa eb ae 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 24 c6 3a fa eb b0 90 90 e9 07 00 00 00 0f 00 2d b6 f9 50 00 fb f4 90 e9 07 00 00 00 0f 00 2d a6 f9 50 00 f4 c3 90 90 55 48 89 e5
RSP: 0018:ffff8880a98cfe10 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: 1ffffffff1115231 RBX: ffff8880a98c2340 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: ffffffff812b7b5a RDI: ffff8880a98c2b84
RBP: ffff8880a98cfe18 R08: ffff8880a98c2b98 R09: ffffed1015318469
R10: ffffed1015318469 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff11015318468 R14: dffffc0000000000 R15: 1ffffffff111522f
arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
default_idle_call+0x59/0xa0 kernel/sched/idle.c:94
cpuidle_idle_call kernel/sched/idle.c:154 [inline]
do_idle+0x140/0x670 kernel/sched/idle.c:263
cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:355
start_secondary+0x384/0x410 arch/x86/kernel/smpboot.c:264
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241