INFO: task syz.0.23:6708 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.23 state:D stack:25256 pid:6708 ppid:6444 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
reiserfs_write_lock_nested+0x60/0xd0 fs/reiserfs/lock.c:78
reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:814 [inline]
lock_journal fs/reiserfs/journal.c:534 [inline]
do_journal_end+0x3c6/0x4890 fs/reiserfs/journal.c:4032
reiserfs_create+0x60f/0x690 fs/reiserfs/namei.c:693
lookup_open fs/namei.c:3496 [inline]
open_last_lookups fs/namei.c:3564 [inline]
path_openat+0x12a0/0x3230 fs/namei.c:3794
do_filp_open+0x1f5/0x430 fs/namei.c:3824
do_sys_openat2+0x134/0x1d0 fs/open.c:1421
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1447
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f528819aef9
RSP: 002b:00007f5288fd4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5288406090 RCX: 00007f528819aef9
RDX: 000000000000275a RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007f528822fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5288406128 R14: 00007f5288406090 R15: 00007ffca78899b8
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d12ffe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d12ffe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d12ffe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
4 locks held by kworker/1:2/788:
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc90003a77d00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90003a77d00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#2: ffff8880616180e0 (&type->s_umount_key#26){++++}-{3:3}, at: flush_old_commits+0xd2/0x320 fs/reiserfs/super.c:97
#3: ffff88801a2a2090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
4 locks held by kworker/0:2/1188:
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc9000486fd00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc9000486fd00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#2: ffff888022cf00e0 (&type->s_umount_key#26){++++}-{3:3}, at: flush_old_commits+0xd2/0x320 fs/reiserfs/super.c:97
#3: ffff888079660090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
3 locks held by udevd/5138:
2 locks held by getty/5524:
#0: ffff88802db5d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900015c02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
4 locks held by kworker/0:3/5846:
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc90003267d00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90003267d00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#2: ffff88807a4500e0 (&type->s_umount_key#26){++++}-{3:3}, at: flush_old_commits+0xd2/0x320 fs/reiserfs/super.c:97
#3: ffff88802f968090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
3 locks held by syz.0.23/6706:
4 locks held by syz.0.23/6708:
#0: ffff888022cf0418 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
#1: ffff88805f1afa30 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff88805f1afa30 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3561 [inline]
#1: ffff88805f1afa30 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x7dc/0x3230 fs/namei.c:3794
#2: ffffc900038b90f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline]
#2: ffffc900038b90f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
#2: ffffc900038b90f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x3bc/0x4890 fs/reiserfs/journal.c:4032
#3: ffff888079660090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x60/0xd0 fs/reiserfs/lock.c:78
3 locks held by syz.1.27/6744:
4 locks held by syz.1.27/6746:
#0: ffff888061618418 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
#1: ffff8880771fa410 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff8880771fa410 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3561 [inline]
#1: ffff8880771fa410 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x7dc/0x3230 fs/namei.c:3794
#2: ffffc900043910f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline]
#2: ffffc900043910f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
#2: ffffc900043910f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x3bc/0x4890 fs/reiserfs/journal.c:4032
#3: ffff88801a2a2090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x60/0xd0 fs/reiserfs/lock.c:78
3 locks held by syz.2.40/6822:
4 locks held by syz.2.40/6824:
#0: ffff88807a450418 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:412
#1: ffff8880732d02f0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
#1: ffff8880732d02f0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3561 [inline]
#1: ffff8880732d02f0 (&type->i_mutex_dir_key#8){+.+.}-{3:3}, at: path_openat+0x7dc/0x3230 fs/namei.c:3794
#2: ffffc900049390f0 (&journal->j_mutex){+.+.}-{3:3}, at: reiserfs_mutex_lock_safe fs/reiserfs/reiserfs.h:813 [inline]
#2: ffffc900049390f0 (&journal->j_mutex){+.+.}-{3:3}, at: lock_journal fs/reiserfs/journal.c:534 [inline]
#2: ffffc900049390f0 (&journal->j_mutex){+.+.}-{3:3}, at: do_journal_end+0x3bc/0x4890 fs/reiserfs/journal.c:4032
#3: ffff88802f968090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock_nested+0x60/0xd0 fs/reiserfs/lock.c:78
4 locks held by kworker/0:6/6847:
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#0: ffff888017c71138 ((wq_completion)events_long){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#1: ffffc90004b6fd00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2609 [inline]
#1: ffffc90004b6fd00 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2711
#2: ffff88807d90a0e0 (&type->s_umount_key#26){++++}-{3:3}, at: flush_old_commits+0xd2/0x320 fs/reiserfs/super.c:97
#3: ffff888079d6f090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0xd0 fs/reiserfs/lock.c:27
3 locks held by syz.3.58/6923:
1 lock held by syz-executor/6928:
#0: ffffffff8d1359b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#0: ffffffff8d1359b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3da/0x880 kernel/rcu/tree_exp.h:1004
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf3d/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6744 Comm: syz.1.27 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x90 kernel/kcov.c:314
Code: c0 4c 89 01 48 c7 44 11 08 03 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1e fa 48 8b 04 24 65 48 8b 15 e0 be 7c 7e 65 8b 0d e1 be 7c
RSP: 0018:ffffc900042feb58 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000001014 RCX: 0000000000000000
RDX: ffff8880287f0000 RSI: 0000000000000000 RDI: 0000000000000010
RBP: ffffc900042feca0 R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000070 R11: 0000000000000000 R12: ffff88805f64c030
R13: 0000000000000000 R14: ffff88805f64c030 R15: 1ffff1100bec9806
FS: 00007f6a1302a6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f72ce7a6000 CR3: 0000000063dd8000 CR4: 00000000003506f0
Call Trace:
get_num_ver+0x3bd/0xff0 fs/reiserfs/fix_node.c:471
ip_check_balance fs/reiserfs/fix_node.c:1523 [inline]
check_balance fs/reiserfs/fix_node.c:2083 [inline]
fix_nodes+0x28bc/0x8350 fs/reiserfs/fix_node.c:2636
reiserfs_paste_into_item+0x624/0x800 fs/reiserfs/stree.c:2128
reiserfs_get_block+0x1c37/0x4060 fs/reiserfs/inode.c:1069
__block_write_begin_int+0x57f/0x1af0 fs/buffer.c:2124
reiserfs_write_begin+0x20a/0x4c0 fs/reiserfs/inode.c:2771
generic_perform_write+0x2fe/0x5c0 mm/filemap.c:4031
generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4152
call_write_iter include/linux/fs.h:2018 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x46c/0x990 fs/read_write.c:584
ksys_pwrite64 fs/read_write.c:699 [inline]
__do_sys_pwrite64 fs/read_write.c:709 [inline]
__se_sys_pwrite64 fs/read_write.c:706 [inline]
__x64_sys_pwrite64+0x19b/0x230 fs/read_write.c:706
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6a1219aef9
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:00007f6a1302a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f6a12405fa0 RCX: 00007f6a1219aef9
RDX: 0000000000000001 RSI: 000020000001f900 RDI: 0000000000000005
RBP: 00007f6a1222fee0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000008000c63 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6a12406038 R14: 00007f6a12405fa0 R15: 00007fff817f7008