INFO: task syz.2.106:6345 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.106 state:D stack:28120 pid:6345 tgid:6343 ppid:5597 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
io_schedule+0x80/0xe0 kernel/sched/core.c:8154
TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
txBegin+0x281/0xbe0 fs/jfs/jfs_txnmgr.c:376
jfs_mknod+0x214/0x9d0 fs/jfs/namei.c:1387
vfs_mknod+0x443/0x610 fs/namei.c:5135
filename_mknodat+0x3cf/0x670 fs/namei.c:-1
__do_sys_mknodat fs/namei.c:5216 [inline]
__se_sys_mknodat+0x3b/0x150 fs/namei.c:5212
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: 0033:0x7f1fdf9de0d9
RSP: 002b:00007f1fddc15028 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f1fdfc66090 RCX: 00007f1fdf9de0d9
RDX: 00000000000021c0 RSI: 0000200000000400 RDI: ffffffffffffff9c
RBP: 00007f1fdfa75024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000103 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1fdfc66128 R14: 00007f1fdfc66090 R15: 00007ffc8f2e7e08
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
#0: ffff888032898938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff888032898938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90000117c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90000117c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x123/0x16e0 net/ipv6/addrconf.c:4229
1 lock held by khungtaskd/37:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by kworker/u8:4/66:
#0: ffff88801eaec138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88801eaec138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc9000151fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc9000151fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
3 locks held by kworker/u8:7/175:
5 locks held by kworker/u8:21/3352:
2 locks held by getty/5347:
#0: ffff888036a1b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cbe2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
4 locks held by kworker/0:5/5709:
5 locks held by kworker/1:6/5804:
2 locks held by syz.2.106/6345:
#0: ffff88803c022500 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#1: ffff888060a46ff0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
#1: ffff888060a46ff0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
#1: ffff888060a46ff0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
#1: ffff888060a46ff0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4955
1 lock held by udevd/6462:
#0: ffff888023454b88 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
#0: ffff888023454b88 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x2e6/0x430 block/fops.c:829
2 locks held by syz-executor/7276:
#0: ffff8880331b40d0 (&type->s_umount_key#95){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880331b40d0 (&type->s_umount_key#95){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880331b40d0 (&type->s_umount_key#95){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:509
#1: ffff8880254c8920 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:396 [inline]
#1: ffff8880254c8920 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x20f/0xc30 fs/fs-writeback.c:3028
2 locks held by syz-executor/7408:
#0: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x8a3/0x1bd0 net/core/rtnetlink.c:4158
#1: ffff88803cb59978 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50
3 locks held by syz-executor/7427:
#0: ffffffff8f61dc60 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1217
#1: ffffffff8f61da78 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
#1: ffffffff8f61da78 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
#1: ffffffff8f61da78 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0 net/netlink/genetlink.c:1208
#2: ffffffff8f5ac8f8 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_register_hw+0x3881/0x4a50 net/mac80211/main.c:1561
2 locks held by segctord/7918:
3 locks held by syz.5.247/7943:
2 locks held by syz.4.249/7951:
#0: ffff8880626320d0 (&type->s_umount_key#55/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline]
#0: ffff8880626320d0 (&type->s_umount_key#55/1){+.+.}-{4:4}, at: sget_fc+0x938/0x1910 fs/super.c:766
#1: ffffffff8de0c5e8 (bit_wait_table + i){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#1: ffffffff8de0c5e8 (bit_wait_table + i){+.+.}-{3:3}, at: finish_wait kernel/sched/wait.c:394 [inline]
#1: ffffffff8de0c5e8 (bit_wait_table + i){+.+.}-{3:3}, at: __wait_on_bit+0x1ec/0x2f0 kernel/sched/wait_bit.c:55
1 lock held by sed/7954:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5709 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: wg-crypt-wg1 wg_packet_tx_worker
RIP: 0010:__bfs_next kernel/locking/lockdep.c:1699 [inline]
RIP: 0010:__bfs kernel/locking/lockdep.c:1752 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x1727/0x2ce0 kernel/locking/lockdep.c:5237
Code: 05 26 a5 05 14 48 b8 00 00 00 00 01 00 00 00 48 89 05 0d a5 05 14 48 8d 84 24 90 00 00 00 48 89 05 fe 24 05 14 31 ff 45 31 ff <4d> 85 ff 4c 8b 6c 24 08 74 2e 49 8b 47 30 48 85 c0 74 25 48 8b 40
RSP: 0018:ffffc90005b9f410 EFLAGS: 00000046
RAX: ffffffff934d8b80 RBX: 00000000000003cd RCX: 00000000000b3100
RDX: ffffffff96478888 RSI: ffff88802bd269d0 RDI: 00000000000003cd
RBP: 57645dfc1464829f R08: ffffc90005b9f3d8 R09: 0000000000000020
R10: 0000000000000000 R11: ffffffff81a1c840 R12: 0000000000000510
R13: ffff88802bd269d0 R14: ffff88802bd25d00 R15: ffffffff96478c08
FS: 0000000000000000(0000) GS:ffff888125c3a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd78977ec0 CR3: 000000005eb08000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5868
seqcount_lockdep_reader_access+0x55/0x100 include/linux/seqlock.h:73
ktime_get+0x45/0x220 kernel/time/timekeeping.c:971
hrtick_start+0x99/0x250 kernel/sched/core.c:980
enqueue_task+0x75/0x410 kernel/sched/core.c:2184
sched_change_end+0x213/0x600 kernel/sched/core.c:11255
class_sched_change_destructor kernel/sched/sched.h:4208 [inline]
do_set_cpus_allowed kernel/sched/core.c:2795 [inline]
__set_cpus_allowed_ptr_locked+0x3d9/0x19c0 kernel/sched/core.c:3178
__set_cpus_allowed_ptr kernel/sched/core.c:3212 [inline]
___migrate_enable+0x19c/0x1f0 kernel/sched/core.c:2476
__migrate_enable include/linux/sched.h:2456 [inline]
migrate_enable include/linux/sched.h:2505 [inline]
__local_bh_enable+0x21a/0x2f0 kernel/softirq.c:250
__local_bh_enable_ip+0x1a0/0x2b0 kernel/softirq.c:305
wg_packet_create_data_done drivers/net/wireguard/send.c:247 [inline]
wg_packet_tx_worker+0x16b/0x7e0 drivers/net/wireguard/send.c:276
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