INFO: task syz-executor.1:8020 blocked for more than 143 seconds.
Not tainted 6.7.0-rc2-syzkaller-00014-gc2d5304e6c64 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:27376 pid:8020 tgid:8017 ppid:5101 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1961/0x4ab0 kernel/sched/core.c:6688
__schedule_loop kernel/sched/core.c:6763 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6778
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a3/0xd60 kernel/locking/mutex.c:747
blkdev_put+0xff/0x770 block/bdev.c:928
bdev_release+0x57/0x70 block/bdev.c:952
blkdev_release+0x3b/0x40 block/fops.c:616
__fput+0x3cc/0xa10 fs/file_table.c:394
task_work_run+0x24a/0x300 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296
do_syscall_64+0x52/0x110 arch/x86/entry/common.c:88
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f91b3c7cae9
RSP: 002b:00007f91b49d00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f91b3d9bf80 RCX: 00007f91b3c7cae9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f91b3cc847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f91b3d9bf80 R15: 00007ffc8a8319b8
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by getty/4817:
#0: ffff88814b8320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by udevd/5426:
#0: ffff88801cff94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
3 locks held by kworker/u4:7/5987:
1 lock held by syz-executor.1/8020:
#0: ffff88801cff94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:928
1 lock held by syz-executor.1/8086:
#0: ffff88801cff94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
1 lock held by syz-executor.1/8135:
#0: ffff88801cff94c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x123/0x480 block/bdev.c:786
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc2-syzkaller-00014-gc2d5304e6c64 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2830 Comm: kworker/u4:11 Not tainted 6.7.0-rc2-syzkaller-00014-gc2d5304e6c64 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:trace_irq_enable+0x34/0xf0 include/trace/events/preemptirq.h:40
Code: 6e 7e 83 f8 08 73 32 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 28 c0 00 8f be 08 00 00 00 e8 e4 00 55 00 48 0f a3 1d d4 66 6b 0d <73> 09 e8 95 45 e1 ff 84 c0 74 0a 5b 41 5e c3 90 0f 0b 90 eb c8 90
RSP: 0018:ffffc9000a50fa20 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff8195594c
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8f00c028
RBP: ffffc9000a50faf0 R08: ffffffff8f00c02f R09: 1ffffffff1e01805
R10: dffffc0000000000 R11: fffffbfff1e01806 R12: dffffc0000000000
R13: 1ffff920014a1f50 R14: ffffc9000a50fa80 R15: 0000000000000201
FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555568c938 CR3: 000000000d730000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56
__local_bh_enable_ip+0x168/0x1f0 kernel/softirq.c:386
spin_unlock_bh include/linux/spinlock.h:396 [inline]
batadv_nc_purge_paths+0x309/0x3a0 net/batman-adv/network-coding.c:471
batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720
process_one_work kernel/workqueue.c:2630 [inline]
process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2703
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2784
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242