INFO: task syz-executor.0:16970 blocked for more than 143 seconds.
Not tainted 5.15.148-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:24640 pid:16970 ppid: 3534 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
schedule+0x11b/0x1f0 kernel/sched/core.c:6459
schedule_timeout+0xac/0x300 kernel/time/timer.c:1860
do_wait_for_common+0x2d9/0x480 kernel/sched/completion.c:85
__wait_for_common kernel/sched/completion.c:106 [inline]
wait_for_common kernel/sched/completion.c:117 [inline]
wait_for_completion+0x48/0x60 kernel/sched/completion.c:138
flush_workqueue+0x737/0x1610 kernel/workqueue.c:2882
nbd_start_device_ioctl drivers/block/nbd.c:1365 [inline]
__nbd_ioctl drivers/block/nbd.c:1427 [inline]
nbd_ioctl+0xab8/0xe10 drivers/block/nbd.c:1467
blkdev_ioctl+0x333/0x6b0 block/ioctl.c:606
block_ioctl+0xb1/0xf0 block/fops.c:493
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f06a42c6da9
RSP: 002b:00007f06a28470c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f06a43f4f80 RCX: 00007f06a42c6da9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f06a431347a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f06a43f4f80 R15: 00007ffea1450c38
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c91f220 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:1/144:
2 locks held by nbd0-recv/999:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90004d27d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by getty/3274:
#0: ffff88802489f098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002bae2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
2 locks held by kworker/u5:2/3540:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90002df7d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by kworker/u5:3/3542:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90002e07d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by kworker/u5:4/3543:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90003027d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by kworker/u5:5/3547:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90003067d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by kworker/u5:0/16986:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc90004f77d20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
2 locks held by kworker/u5:1/16987:
#0: ffff88801b802938 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc900051ffd20 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
1 lock held by syz-executor.0/17349:
3 locks held by syz-executor.2/21635:
1 lock held by syz-executor.3/21641:
#0: ffffffff8cfd1e88 (tty_mutex){+.+.}-{3:3}, at: tty_open_by_driver drivers/tty/tty_io.c:2064 [inline]
#0: ffffffff8cfd1e88 (tty_mutex){+.+.}-{3:3}, at: tty_open+0x237/0xde0 drivers/tty/tty_io.c:2148
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:295
kthread+0x3f6/0x4f0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 21647 Comm: syz-executor.1 Not tainted 5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0033:0x7fbe4d9e483b
Code: cd 48 01 c1 49 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 47 0f b6 0c 08 <45> 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01 49 89 47 10 83
RSP: 002b:00007fbe4bfb8530 EFLAGS: 00000206
RAX: 00000000005e05c4 RBX: 00007fbe4bfb85d0 RCX: 00000000000000f7
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007fbe4bfb8670
RBP: 0000000000000102 R08: 00007fbe43b99000 R09: 0000000000000000
R10: 0000000000000000 R11: 00007fbe4bfb85e0 R12: 0000000000000001
R13: 00007fbe4daa7cc0 R14: 0000000000000000 R15: 00007fbe4bfb8670
FS: 00007fbe4bfb96c0 GS: 0000000000000000