INFO: task syz-executor:5791 blocked for more than 143 seconds.
Not tainted 6.6.101-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21736 pid:5791 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
io_schedule+0x80/0xd0 kernel/sched/core.c:9023
folio_wait_bit_common+0x6eb/0xf70 mm/filemap.c:1329
__filemap_get_folio+0xbc/0xbc0 mm/filemap.c:1910
truncate_inode_pages_range+0x40a/0xf00 mm/truncate.c:376
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:1250
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+0xb1/0x140 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: 0033:0x7ff70498ff17
RSP: 002b:00007ffd8873e718 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007ff704a11c05 RCX: 00007ff70498ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd8873e7d0
RBP: 00007ffd8873e7d0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd8873f860
R13: 00007ff704a11c05 R14: 000000000011247b R15: 00007ffd8873f8a0
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8cd35b78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8cd35b78 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x448/0x830 kernel/rcu/tree_exp.h:1004
2 locks held by kworker/1:0/23:
2 locks held by kworker/1:1/28:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2fba0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/1:2/55:
2 locks held by getty/5554:
#0: ffff888031cb20a0 (&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/5791:
#0: ffff88807e7220e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807e7220e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807e7220e0 (&type->s_umount_key#55){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
1 lock held by kworker/R-wg-cr/5819:
#0: ffffffff8cbdb988 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_attach_to_pool+0x2e/0x380 kernel/workqueue.c:2103
1 lock held by kworker/R-wg-cr/5826:
1 lock held by kworker/R-wg-cr/5827:
#0: ffffffff8cbdb988 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x4c/0x270 kernel/workqueue.c:2137
2 locks held by kworker/R-wg-cr/26870:
1 lock held by kworker/R-wg-cr/26871:
#0: ffffffff8cbdb988 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x4c/0x270 kernel/workqueue.c:2137
1 lock held by kworker/R-wg-cr/26872:
#0: ffffffff8cbdb988 (wq_pool_attach_mutex){+.+.}-{3:3}, at: worker_detach_from_pool+0x4c/0x270 kernel/workqueue.c:2137
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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: 28 Comm: kworker/1:1 Not tainted 6.6.101-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0xbb1/0x7c80 kernel/locking/lockdep.c:5087
Code: 8e 80 e1 07 80 c1 03 38 c1 0f 8c c1 fe ff ff 48 c7 c7 a0 b9 4a 8e e8 5e c2 75 00 49 b8 00 00 00 00 00 fc ff df e9 a6 fe ff ff <8b> 84 24 88 00 00 00 38 44 24 38 4c 8b 6c 24 20 4c 8b 7c 24 10 76
RSP: 0018:ffffc900001ef980 EFLAGS: 00000046
RAX: 0000000000000005 RBX: 0000000000000005 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90da3520
RBP: ffffc900001efbc8 R08: dffffc0000000000 R09: 1ffffffff21b46a4
R10: dffffc0000000000 R11: fffffbfff21b46a5 R12: 0000000000000002
R13: ffff888018298bc8 R14: ffffffff9070cf7a R15: ffff888018298bc8
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f13ed65f1b0 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_check_no_obj_freed lib/debugobjects.c:979 [inline]
debug_check_no_obj_freed+0x13a/0x540 lib/debugobjects.c:1020
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0xd2/0x1b0 mm/slub.c:1832
slab_free mm/slub.c:3816 [inline]
kmem_cache_free+0xf8/0x280 mm/slub.c:3838
kfree_skb include/linux/skbuff.h:1232 [inline]
ip6_mc_input+0xa7e/0xc70 net/ipv6/ip6_input.c:589
ip_sabotage_in+0x1f4/0x280 net/bridge/br_netfilter_hooks.c:1004
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_slow+0xbd/0x200 net/netfilter/core.c:626
nf_hook include/linux/netfilter.h:259 [inline]
NF_HOOK+0x204/0x390 include/linux/netfilter.h:302
__netif_receive_skb_one_core net/core/dev.c:5596 [inline]
__netif_receive_skb+0xcc/0x290 net/core/dev.c:5710
netif_receive_skb_internal net/core/dev.c:5796 [inline]
netif_receive_skb+0x1bc/0x6f0 net/core/dev.c:5855
NF_HOOK+0x9a/0x380 include/linux/netfilter.h:304
br_handle_frame_finish+0x146c/0x1920 net/bridge/br_input.c:221
br_nf_hook_thresh+0x3b6/0x480 net/bridge/br_netfilter_hooks.c:1187
br_nf_pre_routing_finish_ipv6+0x9e3/0xd90 net/bridge/br_netfilter_ipv6.c:-1
NF_HOOK include/linux/netfilter.h:304 [inline]
br_nf_pre_routing_ipv6+0x34d/0x680 net/bridge/br_netfilter_ipv6.c:184
nf_hook_entry_hookfn include/linux/netfilter.h:144 [inline]
nf_hook_bridge_pre net/bridge/br_input.c:277 [inline]
br_handle_frame+0x96b/0x1480 net/bridge/br_input.c:424
__netif_receive_skb_core+0xf6b/0x3ac0 net/core/dev.c:5490
__netif_receive_skb_one_core net/core/dev.c:5594 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5710
process_backlog+0x380/0x6e0 net/core/dev.c:6038
__napi_poll+0xc0/0x460 net/core/dev.c:6600
napi_poll net/core/dev.c:6667 [inline]
net_rx_action+0x5ea/0xbf0 net/core/dev.c:6803
handle_softirqs+0x280/0x820 kernel/softirq.c:578
do_softirq+0xed/0x180 kernel/softirq.c:479
__local_bh_enable_ip+0x178/0x1c0 kernel/softirq.c:406
neigh_periodic_work+0xb53/0xd70 net/core/neighbour.c:1017
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
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