INFO: task syz.2.19:6241 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.19 state:D stack:23304 pid:6241 tgid:6204 ppid:5812 task_flags:0x440140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
xfs_ail_push_all_sync+0x1c1/0x290 fs/xfs/xfs_trans_ail.c:744
xfs_log_quiesce+0xdc/0x600 fs/xfs/xfs_log.c:977
xfs_fs_freeze+0x7e/0x160 fs/xfs/xfs_super.c:1009
freeze_super+0x92f/0x11b0 fs/super.c:2076
xchk_fsfreeze fs/xfs/scrub/fscounters.c:126 [inline]
xchk_fscounters_freeze+0x152/0x5c0 fs/xfs/scrub/fscounters.c:164
xchk_setup_fscounters+0x1ab/0x230 fs/xfs/scrub/fscounters.c:235
xfs_scrub_metadata+0xa74/0x1910 fs/xfs/scrub/scrub.c:709
xfs_ioc_scrubv_metadata+0x7ac/0xb70 fs/xfs/scrub/scrub.c:981
xfs_file_ioctl+0x916/0x1590 fs/xfs/xfs_ioctl.c:1308
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f904099de99
RSP: 002b:00007f90418e8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9040c26090 RCX: 00007f904099de99
RDX: 0000200000000000 RSI: 00000000c0285840 RDI: 0000000000000006
RBP: 00007f9040a33eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9040c26128 R14: 00007f9040c26090 R15: 00007ffc31f1f1e8
Showing all locks held in the system:
1 lock held by khungtaskd/32:
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by dhcpcd/5283:
#0: ffff888076dfd6e8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xf4/0x7b0 net/netlink/af_netlink.c:2410
#1: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#1: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dump_ifinfo+0xa74/0x14a0 net/core/rtnetlink.c:2562
2 locks held by getty/5374:
#0: ffff88803251a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
5 locks held by kworker/u8:3/5735:
#0: ffff8880b873b160 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2d/0x160 kernel/sched/core.c:667
#1: ffff8880b8724440 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x57/0x7d0 kernel/sched/psi.c:933
#2: ffff8880736607a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6884 [inline]
#2: ffff8880736607a0 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xb4/0x420 net/wireless/core.c:524
#3: ffffffff9aa13348 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0xb7/0x420 lib/debugobjects.c:873
#4: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#4: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#4: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
#4: ffffffff8eb59c60 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0x8f/0x2550 arch/x86/kernel/unwind_orc.c:495
5 locks held by kworker/u8:8/5847:
#0: ffff88801c28e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88801c28e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc900033a7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc900033a7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff9001e388 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf5/0x810 net/core/net_namespace.c:673
#3: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: default_device_exit_batch+0xe5/0x9e0 net/core/dev.c:13085
#4: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#4: ffffffff8eb5ff68 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
4 locks held by syz.2.19/6241:
#0: ffff88807cebc450 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#0: ffff88807cebc450 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x4e9/0x11b0 fs/super.c:2054
#1: ffff88807cebc0d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#1: ffff88807cebc0d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#1: ffff88807cebc0d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: freeze_super+0x4f1/0x11b0 fs/super.c:2055
#2: ffff88807cebc548 (sb_pagefaults#2){+.+.}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#2: ffff88807cebc548 (sb_pagefaults#2){+.+.}-{0:0}, at: freeze_super+0x51b/0x11b0 fs/super.c:2059
#3: ffff88807cebc640 (sb_internal#2){++++}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#3: ffff88807cebc640 (sb_internal#2){++++}-{0:0}, at: freeze_super+0x8d3/0x11b0 fs/super.c:2073
4 locks held by syz.8.31/6650:
#0: ffff88807bae8450 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#0: ffff88807bae8450 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x4e9/0x11b0 fs/super.c:2054
#1: ffff88807bae80d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#1: ffff88807bae80d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#1: ffff88807bae80d8 (&type->s_umount_key#54){+.+.}-{4:4}, at: freeze_super+0x4f1/0x11b0 fs/super.c:2055
#2: ffff88807bae8548 (sb_pagefaults#2){+.+.}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#2: ffff88807bae8548 (sb_pagefaults#2){+.+.}-{0:0}, at: freeze_super+0x51b/0x11b0 fs/super.c:2059
#3: ffff88807bae8640 (sb_internal#2){++++}-{0:0}, at: sb_wait_write fs/super.c:1790 [inline]
#3: ffff88807bae8640 (sb_internal#2){++++}-{0:0}, at: freeze_super+0x8d3/0x11b0 fs/super.c:2073
1 lock held by syz-executor/8984:
#0: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0 net/core/rtnetlink.c:4158
2 locks held by syz-executor/9015:
#0: ffffffff9001e388 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720 net/core/net_namespace.c:575
#1: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock_killable include/linux/rtnetlink.h:145 [inline]
#1: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: register_netdev+0x18/0x60 net/core/dev.c:11559
2 locks held by syz-executor/9029:
#0: ffffffff9001e388 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4e2/0x720 net/core/net_namespace.c:575
#1: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d5/0x820 net/ipv4/ip_tunnel.c:1149
3 locks held by syz.8.270/9078:
#0: ffff888026552430 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0xc2/0xd50 drivers/block/loop.c:1226
#1: ffff888022f2d430 (&q->q_usage_counter(io)#25){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
#1: ffff888022f2d430 (&q->q_usage_counter(io)#25){++++}-{0:0}, at: loop_set_status+0x2ce/0xd50 drivers/block/loop.c:1242
#2: ffff888022f2d468 (&q->q_usage_counter(queue)#9){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
#2: ffff888022f2d468 (&q->q_usage_counter(queue)#9){+.+.}-{0:0}, at: loop_set_status+0x2ce/0xd50 drivers/block/loop.c:1242
1 lock held by syz-executor/9085:
#0: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff9002cf40 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x464/0x19e0 net/ipv4/devinet.c:978
6 locks held by syz.2.271/9100:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
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+0xfd7/0x1030 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: kworker/1:1 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: events free_obj_work
RIP: 0010:__schedule+0x17f7/0x56c0 kernel/sched/core.c:7242
Code: 27 4c 89 f7 4c 89 e6 e8 87 59 62 f5 48 89 c7 e8 4f 48 c4 f5 31 ff 4d 39 e6 40 0f 95 c7 e8 b1 54 c4 f5 66 42 c7 44 2b 0c f8 f8 <48> c7 84 24 20 01 00 00 0e 36 e0 45 4a c7 04 2b 00 00 00 00 4a c7
RSP: 0018:ffffc90000a477a0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 1ffff92000148f18 RCX: 0000000080000002
RDX: 0000000000000000 RSI: ffffffff8c4bda60 RDI: ffffffff8c4bda20
RBP: ffffc90000a479a0 R08: ffffffff905786f7 R09: 1ffffffff20af0de
R10: dffffc0000000000 R11: fffffbfff20af0df R12: ffff888028b18000
R13: dffffc0000000000 R14: ffff88801e2c0000 R15: ffff8880b873b158
FS: 0000000000000000(0000) GS:ffff888125054000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555580ba38 CR3: 00000000707a2000 CR4: 0000000000350ef0
Call Trace:
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7413
preempt_schedule_thunk+0x16/0x40 arch/x86/entry/thunk.S:12
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
_raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:198
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:573 [inline]
free_obj_work+0x325/0x490 lib/debugobjects.c:515
process_one_work kernel/workqueue.c:3322 [inline]
process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
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