INFO: task syz-executor:5768 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20976 pid:5768 ppid:1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
io_schedule+0x80/0xd0 kernel/sched/core.c:9022
folio_wait_bit_common+0x6eb/0xf70 mm/filemap.c:1329
truncate_inode_pages_range+0xa2d/0xf00 mm/truncate.c:446
evict+0x499/0x870 fs/inode.c:707
dispose_list fs/inode.c:738 [inline]
evict_inodes+0x5fe/0x690 fs/inode.c:792
generic_shutdown_super+0x97/0x2b0 fs/super.c:672
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x429/0x4c0 fs/namespace.c:1259
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fafa7d90a77
RSP: 002b:00007ffe6bf76d08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fafa7e13d7d RCX: 00007fafa7d90a77
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe6bf76dc0
RBP: 00007ffe6bf76dc0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffe6bf77e50
R13: 00007fafa7e13d7d R14: 0000000000016c83 R15: 00007ffe6bf77e90
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2ff20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5530:
#0: ffff88802d3dc0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
1 lock held by syz-executor/5768:
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
3 locks held by kworker/1:4/5779:
#0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017870938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc9000455fd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000455fd00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#2: ffff88807907a240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x26c/0x3170 drivers/net/netdevsim/fib.c:1491
1 lock held by syz.1.92/6727:
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117
1 lock held by syz-executor/7001:
#0: ffff88802bc300e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88802bc300e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88802bc300e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
1 lock held by syz-executor/7416:
#0: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8cd358f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x448/0x830 kernel/rcu/tree_exp.h:1004
1 lock held by syz.5.163/7559:
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807ced80e0 (&type->s_umount_key#52){++++}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117
7 locks held by dhcpcd-run-hook/7666:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7416 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:visit_lock_entry kernel/locking/lockdep.c:1520 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1800 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1844 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2804 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3138 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3253 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3869 [inline]
RIP: 0010:__lock_acquire+0x3648/0x7c80 kernel/locking/lockdep.c:5137
Code: df 4d 8b 3f 4c 89 6c 24 30 4d 39 f7 75 0d e9 88 fb ff ff 4d 8b 3f 4d 39 f7 74 45 49 8d 7f 30 48 89 f8 48 c1 e8 03 80 3c 10 00 <74> 0f e8 b1 ca 75 00 48 ba 00 00 00 00 00 fc ff df 49 89 5f 30 4c
RSP: 0018:ffffc900046aebc0 EFLAGS: 00000046
RAX: 1ffffffff26f53dd RBX: ffffffff93841a68 RCX: 0000000000000233
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff937a9ee8
RBP: ffffc900046aee08 R08: ffffc900046aed97 R09: 0000000000000000
R10: ffffc900046aed60 R11: fffff520008d5db3 R12: ffffffff92ddfc90
R13: 00000000000003fd R14: ffffffff90722210 R15: ffffffff937a9eb8
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f46720cbe0 CR3: 000000000cb30000 CR4: 00000000003506e0
Call Trace:
lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xa8/0xf0 kernel/locking/spinlock.c:162
debug_object_deactivate+0x67/0x350 lib/debugobjects.c:764
debug_work_deactivate kernel/workqueue.c:577 [inline]
try_to_grab_pending+0x375/0x850 kernel/workqueue.c:1596
mod_delayed_work_on+0x90/0x1a0 kernel/workqueue.c:2021
mod_delayed_work include/linux/workqueue.h:592 [inline]
mld_ifc_start_work net/ipv6/mcast.c:1072 [inline]
mld_ifc_event net/ipv6/mcast.c:2673 [inline]
igmp6_leave_group net/ipv6/mcast.c:2629 [inline]
igmp6_group_dropped+0x9cf/0xd20 net/ipv6/mcast.c:722
__ipv6_dev_mc_dec+0x2b3/0x330 net/ipv6/mcast.c:977
addrconf_leave_solict net/ipv6/addrconf.c:2217 [inline]
__ipv6_ifa_notify+0x434/0xaa0 net/ipv6/addrconf.c:6262
addrconf_ifdown+0xe6a/0x1880 net/ipv6/addrconf.c:3949
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
dev_close_many+0x297/0x400 net/core/dev.c:1619
unregister_netdevice_many_notify+0x4c1/0x1810 net/core/dev.c:11059
unregister_netdevice_many net/core/dev.c:11142 [inline]
unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11022
unregister_netdevice include/linux/netdevice.h:3137 [inline]
__tun_detach+0xd45/0x1500 drivers/net/tun.c:685
tun_detach drivers/net/tun.c:701 [inline]
tun_chr_close+0x10d/0x1c0 drivers/net/tun.c:3511
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1ce/0x250 kernel/task_work.c:239
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x90b/0x23c0 kernel/exit.c:883
do_group_exit+0x21b/0x2d0 kernel/exit.c:1024
__do_sys_exit_group kernel/exit.c:1035 [inline]
__se_sys_exit_group kernel/exit.c:1033 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1033
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f863418f749
Code: Unable to access opcode bytes at 0x7f863418f71f.
RSP: 002b:00007ffc6e97a5b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f8634213d89 RCX: 00007f863418f749
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 0000000000000002 R08: 00007ffc6e978357 R09: 00007ffc6e97b870
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc6e97b870
R13: 00007f8634213d7d R14: 000000000003c627 R15: 00007ffc6e97da30