INFO: task syz.8.349:9111 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.8.349 state:D stack:27416 pid:9111 tgid:9095 ppid:8231 task_flags:0x400040 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
io_schedule+0x7f/0xd0 kernel/sched/core.c:8110
TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
txBegin+0x27d/0xc00 fs/jfs/jfs_txnmgr.c:376
jfs_mkdir+0x21d/0xb00 fs/jfs/namei.c:232
vfs_mkdir+0x40b/0x630 fs/namei.c:5261
filename_mkdirat+0x289/0x520 fs/namei.c:5294
__do_sys_mkdirat fs/namei.c:5315 [inline]
__se_sys_mkdirat+0x35/0x150 fs/namei.c:5312
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: 0033:0x7f2ee849bcc7
RSP: 002b:00007f2ee66d4e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f2ee66d4ee0 RCX: 00007f2ee849bcc7
RDX: 00000000000001ff RSI: 00002000000005c0 RDI: 00000000ffffff9c
RBP: 0000200000000b00 R08: 0000200000000140 R09: 0000000000000000
R10: 0000200000000b00 R11: 0000000000000246 R12: 00002000000005c0
R13: 00007f2ee66d4ea0 R14: 0000000000000000 R15: 0000000000000000
Showing all locks held in the system:
5 locks held by kworker/u8:1/13:
1 lock held by khungtaskd/38:
#0: ffffffff8dfc8000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8dfc8000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8dfc8000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:2/41:
10 locks held by kworker/u8:4/67:
2 locks held by kworker/u8:5/69:
5 locks held by kworker/u8:6/157:
3 locks held by kworker/u8:9/1171:
3 locks held by kworker/u8:12/1375:
2 locks held by kworker/u8:13/1417:
5 locks held by kworker/u8:14/1426:
2 locks held by getty/5354:
#0: ffff8880366940a0 (&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+0x462/0x13a0 drivers/tty/n_tty.c:2211
3 locks held by kworker/1:7/8239:
#0: ffff88801a037938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88801a037938 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90003b87c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90003b87c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffff888039d3e280 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x222/0x3e0 drivers/net/netdevsim/fib.c:1490
2 locks held by syz-executor/8248:
2 locks held by syz.8.349/9111:
#0: ffff88803f66e480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff888060fee648 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1074 [inline]
#1: ffff888060fee648 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2914 [inline]
#1: ffff888060fee648 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2938 [inline]
#1: ffff888060fee648 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x200/0x370 fs/namei.c:4950
2 locks held by syz-executor/9313:
#0: ffff88803c56e0d0 (&type->s_umount_key#65){+.+.}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803c56e0d0 (&type->s_umount_key#65){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88803c56e0d0 (&type->s_umount_key#65){+.+.}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffff88803c56eb08 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2753 [inline]
#1: ffff88803c56eb08 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x2cb/0xc30 fs/fs-writeback.c:2947
1 lock held by udevd/10410:
#0: ffff888011012480 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
3 locks held by udevd/10562:
8 locks held by syz-executor/10648:
2 locks held by syz.7.582/10778:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 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: 8066 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__hlist_del include/linux/list.h:1031 [inline]
RIP: 0010:hlist_del include/linux/list.h:1043 [inline]
RIP: 0010:debug_object_free+0x27b/0x490 lib/debugobjects.c:1001
Code: e8 03 42 80 3c 38 00 74 08 48 89 ef e8 2e 9e 7f fd 4c 89 6d 00 4d 85 ed 74 1e 49 83 c5 08 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 ef e8 0b 9e 7f fd 49 89 6d 00 43 80 3c 3e 00 74 08 4c
RSP: 0018:ffffc90003c67ca8 EFLAGS: 00000046
RAX: 1ffff11004917afd RBX: 1ffff1100c801bc8 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffff88806400de48
RBP: ffffffff999deea8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200078cf80 R12: ffff88806400de38
R13: ffff8880248bd7e8 R14: 1ffff1100c801bc7 R15: dffffc0000000000
FS: 000055557ab17500(0000) GS:ffff888126283000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc5e823000 CR3: 000000003cb74000 CR4: 00000000003526f0
Call Trace:
destroy_hrtimer_on_stack kernel/time/hrtimer.c:500 [inline]
hrtimer_nanosleep+0x35f/0x450 kernel/time/hrtimer.c:2354
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1391 [inline]
__se_sys_clock_nanosleep+0x35b/0x3b0 kernel/time/posix-timers.c:1368
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: 0033:0x7fa16d74d68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007ffdefbf05c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 000055557ab17500 RCX: 00007fa16d74d68e
RDX: 00007ffdefbf0620 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffdefbf068c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001388
R13: 00000000000927c0 R14: 0000000000092f67 R15: 00007ffdefbf06e0