INFO: task kworker/1:8:4502 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:8 state:D stack:21168 pid: 4502 ppid: 2 flags:0x00004000
Workqueue: events_long flush_old_commits
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11ef/0x43c0 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
queue_log_writer+0x1e9/0x2b0 fs/reiserfs/journal.c:2978
do_journal_begin_r+0x8f6/0x1040 fs/reiserfs/journal.c:3101
journal_begin+0x148/0x350 fs/reiserfs/journal.c:3253
reiserfs_sync_fs fs/reiserfs/super.c:77 [inline]
flush_old_commits+0x20b/0x310 fs/reiserfs/super.c:111
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31eb20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3952:
#0: ffff88802a293098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5df/0x1a70 drivers/tty/n_tty.c:2158
3 locks held by kworker/1:8/4502:
#0: ffff888016c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc9000406fd00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffff8880222660e0 (&type->s_umount_key#121){++++}-{3:3}, at: flush_old_commits+0xce/0x310 fs/reiserfs/super.c:97
3 locks held by kworker/u4:15/7518:
#0: ffff888016c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc900053afd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
#2: ffffffff8d43d3c8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251
2 locks held by kworker/0:5/16412:
#0: ffff888016c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x761/0x1010 kernel/workqueue.c:-1
#1: ffffc9000346fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x79f/0x1010 kernel/workqueue.c:2285
3 locks held by syz.5.3007/18745:
2 locks held by syz.0.3451/21050:
#0: ffffffff8d43d3c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_detach drivers/net/tun.c:699 [inline]
#0: ffffffff8d43d3c8 (rtnl_mutex){+.+.}-{3:3}, at: tun_chr_close+0x3d/0x1b0 drivers/net/tun.c:3440
#1: ffffffff8c3235a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#1: ffffffff8c3235a8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x2d1/0x750 kernel/rcu/tree_exp.h:845
1 lock held by syz.1.3454/21059:
#0: ffffffff8d43d3c8 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x3fc/0x1ec0 drivers/net/tun.c:3052
1 lock held by syz.1.3454/21062:
#0: ffffffff8d43d3c8 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x534/0xe30 net/core/dev_ioctl.c:571
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18745 Comm: syz.5.3007 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:search_by_key+0x1fd2/0x4470 fs/reiserfs/stree.c:800
Code: 5c 24 78 74 08 48 89 df e8 4b a7 be ff 48 8b 13 48 8d 5a 02 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 30 <84> c0 48 89 54 24 18 0f 85 a0 18 00 00 44 0f b7 23 43 0f b6 04 37
RSP: 0018:ffffc90004716d40 EFLAGS: 00000a06
RAX: 0000000000000000 RBX: ffff88800a110002 RCX: 1ffff1100ab202b3
RDX: ffff88800a110000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90004717000 R08: ffff888063a3415b R09: 1ffff1100c74682b
R10: dffffc0000000000 R11: ffffed100c74682c R12: 0000000000000001
R13: 0000000000000002 R14: dffffc0000000000 R15: 1ffff920008e2e68
FS: 00007fed4eb066c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efca008f2f8 CR3: 0000000048c8f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
search_by_entry_key+0x32/0x1370 fs/reiserfs/namei.c:125
reiserfs_find_entry+0xeda/0x18e0 fs/reiserfs/namei.c:322
reiserfs_lookup+0x1e8/0x480 fs/reiserfs/namei.c:368
__lookup_slow+0x29d/0x410 fs/namei.c:1671
lookup_one_len+0x19d/0x2d0 fs/namei.c:2726
open_xa_dir+0x401/0x680 fs/reiserfs/xattr.c:162
xattr_lookup+0x22/0x2a0 fs/reiserfs/xattr.c:395
reiserfs_xattr_set_handle+0x101/0xf70 fs/reiserfs/xattr.c:540
reiserfs_xattr_set+0x467/0x590 fs/reiserfs/xattr.c:640
__vfs_setxattr+0x3e0/0x420 fs/xattr.c:182
__vfs_setxattr_noperm+0x129/0x5e0 fs/xattr.c:216
vfs_setxattr+0x167/0x2e0 fs/xattr.c:303
do_setxattr fs/xattr.c:588 [inline]
setxattr+0x36c/0x390 fs/xattr.c:611
path_setxattr+0x147/0x290 fs/xattr.c:630
__do_sys_lsetxattr fs/xattr.c:653 [inline]
__se_sys_lsetxattr fs/xattr.c:649 [inline]
__x64_sys_lsetxattr+0xb4/0xd0 fs/xattr.c:649
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fed508cddd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fed4eb06028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007fed50b47090 RCX: 00007fed508cddd9
RDX: 0000000000000000 RSI: 0000200000002080 RDI: 0000200000001180
RBP: 00007fed50963d69 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fed50b47128 R14: 00007fed50b47090 R15: 00007fff75adb0f8
</TASK>