INFO: task kworker/u8:13:3199 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:13 state:D stack:19064 pid:3199 tgid:3199 ppid:2 task_flags:0x4248060 flags:0x00080000
Workqueue: xfs-cil/loop3 xlog_cil_push_work
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x16ec/0x5620 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
___down_common kernel/locking/semaphore.c:289 [inline]
__down_common+0x3d0/0x850 kernel/locking/semaphore.c:314
down+0x80/0xd0 kernel/locking/semaphore.c:100
xfs_buf_lock+0x153/0x4c0 fs/xfs/xfs_buf.c:903
xfs_buf_item_unpin+0x1c4/0x710 fs/xfs/xfs_buf_item.c:551
xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline]
xlog_cil_committed+0x9e3/0x1150 fs/xfs/xfs_log_cil.c:995
xlog_cil_push_work+0x256b/0x2b10 fs/xfs/xfs_log_cil.c:1607
process_one_work kernel/workqueue.c:3314 [inline]
process_scheduled_works+0xb5d/0x1860 kernel/workqueue.c:3397
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3478
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.3.78:6326 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.78 state:D stack:24664 pid:6326 tgid:6301 ppid:5604 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x16ec/0x5620 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common kernel/sched/completion.c:121 [inline]
wait_for_common kernel/sched/completion.c:132 [inline]
wait_for_completion+0x2cc/0x5e0 kernel/sched/completion.c:153
__flush_workqueue+0x6f6/0x14f0 kernel/workqueue.c:4122
xlog_cil_push_now fs/xfs/xfs_log_cil.c:1725 [inline]
xlog_cil_force_seq+0x228/0x8c0 fs/xfs/xfs_log_cil.c:1927
xfs_log_force_seq+0x196/0x440 fs/xfs/xfs_log.c:2984
__xfs_trans_commit+0x7e2/0xbf0 fs/xfs/xfs_trans.c:877
xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:926
xfs_sync_sb_buf+0x13f/0x230 fs/xfs/libxfs/xfs_sb.c:1490
xfs_ioc_setlabel+0x1de/0x340 fs/xfs/xfs_ioctl.c:1060
xfs_file_ioctl+0x9c5/0x16d0 fs/xfs/xfs_ioctl.c:1217
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fecb17fce59
RSP: 002b:00007fecafa0c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fecb1a76180 RCX: 00007fecb17fce59
RDX: 0000200000000300 RSI: 0000000041009432 RDI: 0000000000000005
RBP: 00007fecb1892d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fecb1a76218 R14: 00007fecb1a76180 R15: 00007ffe562727d8
Showing all locks held in the system:
7 locks held by kworker/u8:0/12:
#0: ffff88801b290938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88801b290938 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90000117c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90000117c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffffffff8f3497a0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:673
#3: ffff888063a39160 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#3: ffff888063a39160 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline]
#3: ffff888063a39160 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420 net/devlink/core.c:555
#4: ffff88802bc44310 (&devlink->lock_key#8){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:292 [inline]
#4: ffff88802bc44310 (&devlink->lock_key#8){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline]
#4: ffff88802bc44310 (&devlink->lock_key#8){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420 net/devlink/core.c:555
#5: ffffffff8f3584f8 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy+0x16b/0x7f0 drivers/net/netdevsim/netdev.c:1188
#6: ffff888060fa8f78 (&dev_instance_lock_key#23){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2818 [inline]
#6: ffff888060fa8f78 (&dev_instance_lock_key#23){+.+.}-{4:4}, at: unregister_netdevice_many_notify+0x588/0x22b0 net/core/dev.c:12381
2 locks held by kworker/1:0/31:
#0: ffff88803a42f938 ((wq_completion)xfs-sync/loop3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88803a42f938 ((wq_completion)xfs-sync/loop3){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90000a5fc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90000a5fc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
1 lock held by khungtaskd/37:
#0: ffffffff8dfc8080 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8dfc8080 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8dfc8080 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:5/141:
3 locks held by kworker/u8:10/1030:
6 locks held by kworker/u8:12/1457:
2 locks held by kworker/u8:13/3199:
#0: ffff888064b1d938 ((wq_completion)xfs-cil/loop3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff888064b1d938 ((wq_completion)xfs-cil/loop3){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc9000e92fc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc9000e92fc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
2 locks held by getty/5356:
#0: ffff88803644e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cb62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0 drivers/tty/n_tty.c:2211
4 locks held by kworker/0:4/5717:
2 locks held by udevd/5796:
#0: ffff88801e28e480 (sb_writers){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff8880b883b820 (&rq->__lock){-...}-{2:2}, at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652
2 locks held by udevd/5797:
1 lock held by udevd/5802:
#0: ffff888036c4c480 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
2 locks held by udevd/5821:
1 lock held by syz.3.78/6326:
#0: ffff88801e288480 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:537
5 locks held by udevd/6308:
2 locks held by syz-executor/6364:
#0: ffff888037b2a480 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff8880377d37d0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline]
#1: ffff8880377d37d0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2914 [inline]
#1: ffff8880377d37d0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2938 [inline]
#1: ffff8880377d37d0 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: filename_rmdir+0x1cd/0x520 fs/namei.c:5414
3 locks held by syz.0.270/8057:
6 locks held by syz.9.269/8058:
5 locks held by syz.9.269/8063:
1 lock held by syz-executor/8064:
#0: ffffffff8e136980 (namespace_sem){++++}-{4:4}, at: namespace_lock fs/namespace.c:1729 [inline]
#0: ffffffff8e136980 (namespace_sem){++++}-{4:4}, at: class_namespace_excl_constructor fs/namespace.c:90 [inline]
#0: ffffffff8e136980 (namespace_sem){++++}-{4:4}, at: copy_mnt_ns+0x336/0xcb0 fs/namespace.c:4249
4 locks held by syz.5.274/8067:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 29 Comm: ktimers/1 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0x515/0x2cf0 kernel/locking/lockdep.c:5187
Code: 00 eb 1d 44 89 e0 49 ff c7 49 63 8e f0 0b 00 00 48 83 c3 28 41 89 c4 49 39 cf 0f 8d c7 00 00 00 49 83 ff 31 0f 83 83 00 00 00 <8b> 03 25 ff 1f 00 00 48 0f a3 05 ec 65 d2 11 73 10 48 69 c0 c8 00
RSP: 0018:ffffc90000a3ea50 EFLAGS: 00000097
RAX: 0000000000000000 RBX: ffff88801d6f4998 RCX: 00000000ffffffff
RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88801d6f4b08 R08: ffffffff8b1faf2c R09: ffffffff8dfc8080
R10: dffffc0000000000 R11: fffffbfff1f1209f R12: ffffffffffffff05
R13: ffff88801d6f4b08 R14: ffff88801d6f3d80 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888126271000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f126dcfb000 CR3: 000000004fdb8000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
rcu_read_lock include/linux/rcupdate.h:838 [inline]
__rt_spin_trylock kernel/locking/spinlock_rt.c:110 [inline]
rt_spin_trylock+0x128/0x2b0 kernel/locking/spinlock_rt.c:118
alloc_from_pcs mm/slub.c:4743 [inline]
slab_alloc_node mm/slub.c:4883 [inline]
kmem_cache_alloc_noprof+0x1a3/0x680 mm/slub.c:4905
kmem_alloc_batch lib/debugobjects.c:371 [inline]
fill_pool+0x156/0x580 lib/debugobjects.c:420
debug_objects_fill_pool+0x97/0xd0 lib/debugobjects.c:742
debug_object_activate+0x36/0x520 lib/debugobjects.c:831
debug_rcu_head_queue kernel/rcu/rcu.h:236 [inline]
kvfree_call_rcu+0x42/0x3c0 mm/slab_common.c:1961
cfg80211_update_known_bss+0x830/0x1590 net/wireless/scan.c:1943
__cfg80211_bss_update+0x147/0x2110 net/wireless/scan.c:1988
cfg80211_inform_single_bss_data+0xbd8/0x1b80 net/wireless/scan.c:2368
cfg80211_inform_bss_data+0x266/0x3c40 net/wireless/scan.c:3226
cfg80211_inform_bss_frame_data+0x3c7/0x730 net/wireless/scan.c:3317
ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230
ieee80211_scan_rx+0x552/0xa40 net/mac80211/scan.c:364
__ieee80211_rx_handle_packet net/mac80211/rx.c:5353 [inline]
ieee80211_rx_list+0x2a11/0x3770 net/mac80211/rx.c:5638
ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5661
ieee80211_rx include/net/mac80211.h:5395 [inline]
ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452
tasklet_action_common+0x2bf/0x540 kernel/softirq.c:938
handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622
__do_softirq kernel/softirq.c:656 [inline]
run_ktimerd+0x69/0x100 kernel/softirq.c:1151
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245