INFO: task syz-executor.2:17319 blocked for more than 143 seconds.
Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:26376 pid:17319 tgid:17300 ppid:5103 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5376 [inline]
__schedule+0x1960/0x4a80 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
rwsem_down_write_slowpath+0xee6/0x13a0 kernel/locking/rwsem.c:1178
__down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:802 [inline]
do_lock_mount+0x112/0x390 fs/namespace.c:2456
lock_mount fs/namespace.c:2498 [inline]
do_new_mount_fc fs/namespace.c:3280 [inline]
do_new_mount+0x3fc/0xae0 fs/namespace.c:3339
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7fc71d27cae9
RSP: 002b:00007fc71df0e0c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc71d39c050 RCX: 00007fc71d27cae9
RDX: 0000000020002100 RSI: 00000000200020c0 RDI: 0000000000000000
RBP: 00007fc71d2c847a R08: 0000000020002140 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fc71d39c050 R15: 00007ffdd514ff88
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d92d0a0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
#0: ffffffff8d92d0a0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
#0: ffffffff8d92d0a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613
2 locks held by getty/4812:
#0: ffff88802a7720a0 (&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 syz-executor.4/5099:
#0: ffffffff8d932a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:293 [inline]
#0: ffffffff8d932a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:996
1 lock held by syz-executor.3/5101:
#0: ffffffff8d932a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
#0: ffffffff8d932a78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:996
2 locks held by kworker/1:4/5144:
#0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
#0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
#1: ffffc9000495fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2605 [inline]
#1: ffffc9000495fd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1400 kernel/workqueue.c:2703
3 locks held by syz-executor.2/17302:
1 lock held by syz-executor.2/17319:
#0: ffff888038423d30 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#0: ffff888038423d30 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: do_lock_mount+0x112/0x390 fs/namespace.c:2456
3 locks held by syz-executor.0/17391:
1 lock held by syz-executor.0/17398:
#0: ffff8880384243b0 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline]
#0: ffff8880384243b0 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: do_lock_mount+0x112/0x390 fs/namespace.c:2456
1 lock held by udevd/17487:
#0: ffff8880b983c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
4 locks held by kworker/1:1/17518:
5 locks held by syz-executor.2/18528:
2 locks held by syz-executor.2/18538:
2 locks held by syz-executor.5/18531:
1 lock held by syz-executor.5/18537:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
<TASK>
__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+0xfa9/0xff0 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
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 2393 Comm: kworker/u4:7 Not tainted 6.6.0-syzkaller-16201-gb57b17e88bf5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:lock_release+0x15/0x9d0 kernel/locking/lockdep.c:5761
Code: ff ff 89 c6 48 c7 c7 20 aa 7f 8d e8 a5 69 50 03 e9 00 fc ff ff f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 <48> 81 ec 00 01 00 00 49 89 f5 48 89 7c 24 20 65 48 8b 04 25 28 00
RSP: 0018:ffffc9000984faa0 EFLAGS: 00000286
RAX: ffffffff8ae9150f RBX: ffff88803f2c0b80 RCX: ffff8880253b0000
RDX: 0000000000000000 RSI: ffffffff8ae91519 RDI: ffff88803f2c0b98
RBP: ffffc9000984fad8 R08: 0000000000000003 R09: fffff52001309f50
R10: dffffc0000000000 R11: fffff52001309f50 R12: ffff88802a694c80
R13: dffffc0000000000 R14: ffffffff8ae91519 R15: ffff888020d056d0
FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110f292ebf CR3: 000000000d730000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<NMI>
</NMI>
<TASK>
__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:165 [inline]
_raw_spin_unlock_bh+0x1b/0x40 kernel/locking/spinlock.c:210
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+0x365/0x610 net/batman-adv/network-coding.c:722
process_one_work kernel/workqueue.c:2630 [inline]
process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
worker_thread+0xa5f/0xff0 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
</TASK>