INFO: task syz.4.1698:13487 blocked in I/O wait for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.1698 state:D stack:28024 pid:13487 tgid:13466 ppid:11332 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 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
__lock_metapage fs/jfs/jfs_metapage.c:52 [inline]
lock_metapage+0x1ff/0x400 fs/jfs/jfs_metapage.c:66
__get_metapage+0x49a/0xe20 fs/jfs/jfs_metapage.c:749
ea_write+0x5f0/0xde0 fs/jfs/xattr.c:256
ea_put fs/jfs/xattr.c:626 [inline]
__jfs_setxattr+0x944/0x1160 fs/jfs/xattr.c:792
__jfs_xattr_set+0xda/0x170 fs/jfs/xattr.c:941
__vfs_setxattr+0x43c/0x480 fs/xattr.c:218
__vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:252
vfs_setxattr+0x163/0x360 fs/xattr.c:339
do_setxattr fs/xattr.c:654 [inline]
filename_setxattr+0x296/0x630 fs/xattr.c:682
path_setxattrat+0x3eb/0x440 fs/xattr.c:726
__do_sys_setxattr fs/xattr.c:760 [inline]
__se_sys_setxattr fs/xattr.c:756 [inline]
__x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:756
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: 0033:0x7ff39cd9ce59
RSP: 002b:00007ff39dbb7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007ff39d016090 RCX: 00007ff39cd9ce59
RDX: 0000200000001400 RSI: 0000200000000080 RDI: 00002000000000c0
RBP: 00007ff39ce32d6f R08: 0000000000000002 R09: 0000000000000000
R10: 0000000000000835 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff39d016128 R14: 00007ff39d016090 R15: 00007fff9acf67f8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e95cd20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cd20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cd20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5383:
#0: ffff8880365ff0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by syz-executor/5628:
#0: ffffffff8e963028 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:343 [inline]
#0: ffffffff8e963028 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770 kernel/rcu/tree_exp.h:961
3 locks held by kworker/1:7/5783:
#0: ffff888021ec6140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff888021ec6140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc900052efc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc900052efc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffff88802abc71d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#2: ffff88802abc71d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30 drivers/usb/core/hub.c:5899
4 locks held by kworker/u8:13/6150:
#0: ffff88801f2ea140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff88801f2ea140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc9000760fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc9000760fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffff8880796680d8 (&type->s_umount_key#72){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:565
#3: ffff888055e0f4b0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:108
4 locks held by syz.4.1698/13487:
#0: ffff888079668410 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff888055e0f850 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#1: ffff888055e0f850 (&sb->s_type->i_mutex_key#37){+.+.}-{4:4}, at: vfs_setxattr+0x13e/0x360 fs/xattr.c:338
#2: ffff888055e0f4b0 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: __jfs_xattr_set+0xb9/0x170 fs/jfs/xattr.c:940
#3: ffff888055e0f540 (&jfs_ip->xattr_sem){++++}-{4:4}, at: __jfs_setxattr+0xfa/0x1160 fs/jfs/xattr.c:678
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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+0x389/0x470 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: 5358 Comm: kworker/0:3 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: rcu_gp srcu_invoke_callbacks
RIP: 0010:select_idle_sibling kernel/sched/fair.c:8187 [inline]
RIP: 0010:select_task_rq_fair+0xbb0/0x43b0 kernel/sched/fair.c:8891
Code: 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 81 f7 98 00 48 8b 1b e8 49 62 0f 0a 85 c0 74 0d e8 60 c3 11 00 <85> c0 0f 84 db 06 00 00 48 85 db 0f 84 3d f9 ff ff 48 89 5c 24 70
RSP: 0018:ffffc9000332f848 EFLAGS: 00000006
RAX: 0000000000000001 RBX: ffff88801bed0800 RCX: 0000000080000203
RDX: 0000000000000008 RSI: ffffffff8e217295 RDI: ffffffff8c28b9e0
RBP: 0000000000000003 R08: ffffffff903036f7 R09: 1ffffffff20606de
R10: dffffc0000000000 R11: ffffffff81980cb0 R12: 0000000000000000
R13: ffff88801bb59f00 R14: 0000000000000000 R15: ffffffff8e262790
FS: 0000000000000000(0000) GS:ffff8881252a0000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f34ad7eb078 CR3: 0000000074a42000 CR4: 0000000000350ef0
Call Trace:
select_task_rq kernel/sched/core.c:3579 [inline]
try_to_wake_up+0x4db/0x1380 kernel/sched/core.c:4290
swake_up_locked kernel/sched/swait.c:30 [inline]
complete_with_flags kernel/sched/completion.c:29 [inline]
complete+0xa9/0x1b0 kernel/sched/completion.c:52
srcu_invoke_callbacks+0x24e/0x5a0 kernel/rcu/srcutree.c:1917
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+0x389/0x470 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