INFO: task syz-executor.1:23919 blocked for more than 143 seconds.
Not tainted 5.5.0-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D27944 23919 8550 0x00004004
Call Trace:
context_switch kernel/sched/core.c:3386 [inline]
__schedule+0x87f/0xcd0 kernel/sched/core.c:4082
schedule+0x188/0x210 kernel/sched/core.c:4156
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+0x751/0x1820 kernel/workqueue.c:2827
nbd_start_device_ioctl drivers/block/nbd.c:1301 [inline]
__nbd_ioctl drivers/block/nbd.c:1376 [inline]
nbd_ioctl+0x934/0xb10 drivers/block/nbd.c:1416
__blkdev_driver_ioctl block/ioctl.c:321 [inline]
blkdev_ioctl+0x2b8/0x5f0 block/ioctl.c:717
block_ioctl+0xbd/0x100 fs/block_dev.c:1983
vfs_ioctl fs/ioctl.c:47 [inline]
ksys_ioctl fs/ioctl.c:747 [inline]
__do_sys_ioctl fs/ioctl.c:756 [inline]
__se_sys_ioctl+0x113/0x190 fs/ioctl.c:754
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:754
do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: Bad RIP value.
RSP: 002b:00007f85355d0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f85355d16d4 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000003fd R14: 00000000004c54fd R15: 000000000075bf2c
Showing all locks held in the system:
1 lock held by khungtaskd/1108:
#0: ffffffff892d9708 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207
1 lock held by rsyslogd/8419:
#0: ffff8880a92ca620 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x279/0x310 fs/file.c:821
2 locks held by getty/8509:
#0: ffff88809fb1e090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc9000174b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8510:
#0: ffff888099545090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc900017db2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8511:
#0: ffff88809fcb0090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc900017cb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8512:
#0: ffff8880a6edf090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc9000176b2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8513:
#0: ffff88809ed71090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc900017bb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8514:
#0: ffff88809a790090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc900017ab2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by getty/8515:
#0: ffff88808d09c090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:267
#1: ffffc900016fb2e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x22f/0x1bc0 drivers/tty/n_tty.c:2156
2 locks held by kworker/u5:1/9065:
#0: ffff8880a1a4d928 ((wq_completion)knbd1-recv){+.+.}, at: spin_unlock_irq include/linux/spinlock.h:388 [inline]
#0: ffff8880a1a4d928 ((wq_completion)knbd1-recv){+.+.}, at: process_one_work+0x763/0x10f0 kernel/workqueue.c:2237
#1: ffffc9000539fd78 ((work_completion)(&args->work)){+.+.}, at: process_one_work+0x7a5/0x10f0 kernel/workqueue.c:2239
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1108 Comm: khungtaskd Not tainted 5.5.0-syzkaller #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+0x1fb/0x318 lib/dump_stack.c:118
nmi_cpu_backtrace+0xaa/0x190 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x16f/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+0xd40/0xd60 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: 91 Comm: kworker/u4:3 Not tainted 5.5.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_purge_orig
RIP: 0010:__lock_acquire+0x12f1/0x1bc0 kernel/locking/lockdep.c:3824
Code: 48 c7 c7 c0 95 69 89 e8 2d 40 58 00 48 be 00 00 00 00 00 fc ff df 83 3d bc e8 0d 08 00 0f 85 8a ed ff ff c7 04 24 00 00 00 00 <65> 48 8b 04 25 28 00 00 00 48 3b 84 24 20 01 00 00 0f 85 f1 07 00
RSP: 0000:ffffc900011b79c0 EFLAGS: 00000083
RAX: 0000000000000003 RBX: ffff8880a9072c88 RCX: ffffffff815c6e65
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff8a02c968
RBP: ffffc900011b7b20 R08: dffffc0000000000 R09: fffffbfff140592e
R10: fffffbfff140592e R11: 0000000000000000 R12: f7a6f854c8caf96a
R13: ffff8880a9072c90 R14: ffffffff89c5f6e0 R15: ffff8880a9072400
FS: 0000000000000000(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faa244077be CR3: 0000000094dd0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire+0x154/0x250 kernel/locking/lockdep.c:4484
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline]
_raw_spin_lock_bh+0x34/0x50 kernel/locking/spinlock.c:175
spin_lock_bh include/linux/spinlock.h:343 [inline]
batadv_purge_orig_ref+0x167/0x12f0 net/batman-adv/originator.c:1350
batadv_purge_orig+0x19/0x60 net/batman-adv/originator.c:1379
process_one_work+0x7f5/0x10f0 kernel/workqueue.c:2264
worker_thread+0xbbc/0x1630 kernel/workqueue.c:2410
kthread+0x332/0x350 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352