INFO: task kworker/0:0:8 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0 state:D stack:21648 pid:8 ppid:2 flags:0x00004000
Workqueue: events_long flush_mdb
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
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit_lock+0xdc/0x580 kernel/sched/wait_bit.c:90
out_of_line_wait_on_bit_lock+0x123/0x170 kernel/sched/wait_bit.c:117
lock_buffer include/linux/buffer_head.h:385 [inline]
hfs_mdb_commit+0x115/0x1120 fs/hfs/mdb.c:271
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
INFO: task syz-executor:11693 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20776 pid:11693 ppid:1 flags:0x00004004
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
bit_wait_io+0x11/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit_lock+0xdc/0x580 kernel/sched/wait_bit.c:90
out_of_line_wait_on_bit_lock+0x123/0x170 kernel/sched/wait_bit.c:117
lock_buffer include/linux/buffer_head.h:385 [inline]
hfs_mdb_commit+0xc5f/0x1120 fs/hfs/mdb.c:325
hfs_sync_fs+0x15/0x20 fs/hfs/super.c:35
sync_filesystem+0xea/0x220 fs/sync.c:56
generic_shutdown_super+0x6f/0x2b0 fs/super.c:666
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: 0033:0x7f0cd178ff17
RSP: 002b:00007ffdd571d488 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f0cd1811c05 RCX: 00007f0cd178ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdd571d540
RBP: 00007ffdd571d540 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdd571e5d0
R13: 00007f0cd1811c05 R14: 00000000001e800e R15: 00007ffdd571e610
Showing all locks held in the system:
2 locks held by kworker/0:0/8:
#0: ffff888017871138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017871138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
#1: ffffc900000d7d00 ((work_completion)(&(&sbi->mdb_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc900000d7d00 ((work_completion)(&(&sbi->mdb_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x957/0x15b0 kernel/workqueue.c:2711
1 lock held by khungtaskd/29:
#0: ffffffff8cd2fbe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2fbe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2fbe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5542:
#0: ffff8880314d20a0 (&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/11693:
#0: ffff8880782ce0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880782ce0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880782ce0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
4 locks held by kworker/u4:1/19043:
=============================================
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 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: 42 Comm: kworker/u4:2 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline]
RIP: 0010:unwind_next_frame+0xf02/0x2970 arch/x86/kernel/unwind_orc.c:585
Code: 10 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 18 0f b6 04 01 84 c0 0f 85 a7 15 00 00 8b 6d 00 31 ff 89 ee e8 90 e1 4a 00 85 ed <0f> 95 c0 4c 39 f3 0f 96 c1 20 c1 4d 39 f7 0f 97 c0 84 c1 0f 84 fd
RSP: 0018:ffffc90000b2ed58 EFLAGS: 00000202
RAX: ffffffff813ab1c0 RBX: ffffc90000b28000 RCX: 0000000000000000
RDX: ffff8880182a1e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff8880182a1e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: 1ffff92000165dc6
R13: 1ffff92000165dc7 R14: ffffc90000b2f6d8 R15: ffffc90000b30000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005586e8e85088 CR3: 000000000cb30000 CR4: 00000000003506e0
Call Trace:
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1806 [inline]
slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
slab_free mm/slub.c:3816 [inline]
__kmem_cache_free+0xba/0x1f0 mm/slub.c:3829
ieee80211_inform_bss+0xba9/0x1060 net/mac80211/scan.c:160
rdev_inform_bss+0x106/0x410 net/wireless/rdev-ops.h:418
cfg80211_inform_single_bss_frame_data net/wireless/scan.c:2985 [inline]
cfg80211_inform_bss_frame_data+0xb33/0x12b0 net/wireless/scan.c:3012
ieee80211_bss_info_update+0x70b/0x930 net/mac80211/scan.c:211
ieee80211_rx_bss_info net/mac80211/ibss.c:1124 [inline]
ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1613 [inline]
ieee80211_ibss_rx_queued_mgmt+0x17c9/0x2ac0 net/mac80211/ibss.c:1642
ieee80211_iface_process_skb net/mac80211/iface.c:1643 [inline]
ieee80211_iface_work+0x717/0xc70 net/mac80211/iface.c:1697
cfg80211_wiphy_work+0x225/0x260 net/wireless/core.c:437
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