INFO: task kworker/0:0:7 blocked for more than 146 seconds.
      Not tainted 6.3.0-next-20230505-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:25144 pid:7     ppid:2      flags:0x00004000
Workqueue: events_long flush_old_commits
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5343 [inline]
 __schedule+0x1d15/0x5790 kernel/sched/core.c:6669
 schedule+0xde/0x1a0 kernel/sched/core.c:6745
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6804
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747
 reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
 reiserfs_sync_fs+0x81/0x130 fs/reiserfs/super.c:76
 flush_old_commits+0xfb/0x200 fs/reiserfs/super.c:111
 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/0:0/7:
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline]
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline]
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline]
 #0: ffff888012471538 ((wq_completion)events_long){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376
 #1: ffffc900000c7db0 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380
 #2: ffff8880210740e0 (&type->s_umount_key#59){++++}-{3:3}, at: flush_old_commits+0x7c/0x200 fs/reiserfs/super.c:97
 #3: ffff88803d43d090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
1 lock held by rcu_tasks_kthre/13:
 #0: ffffffff8c798e30 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518
1 lock held by rcu_tasks_trace/14:
 #0: ffffffff8c798b30 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:518
1 lock held by khungtaskd/28:
 #0: ffffffff8c799a40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x390 kernel/locking/lockdep.c:6559
3 locks held by kworker/1:2/1028:
2 locks held by getty/4763:
 #0: ffff88802c8aa098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900015b02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2176
4 locks held by kworker/1:3/5094:
 #0: ffff888012471538 (
(wq_completion)events_long){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
(wq_completion)events_long){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline]
(wq_completion)events_long){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1324 [inline]
(wq_completion)events_long){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:643 [inline]
(wq_completion)events_long){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:670 [inline]
(wq_completion)events_long){+.+.}-{0:0}, at: process_one_work+0x883/0x15e0 kernel/workqueue.c:2376
 #1: ffffc90004bdfdb0 ((work_completion)(&(&sbi->old_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8b7/0x15e0 kernel/workqueue.c:2380
 #2: ffff8880396d20e0 (&type->s_umount_key#59){++++}-{3:3}, at: flush_old_commits+0x7c/0x200 fs/reiserfs/super.c:97
 #3: ffff88803ec0a090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
3 locks held by kworker/1:7/5115:
3 locks held by kworker/u4:16/6104:
3 locks held by syz-executor.4/7359:
3 locks held by syz-executor.1/7503:
2 locks held by syz-executor.0/7915:
 #0: ffffffff8e102810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4cb/0x8e0 net/core/net_namespace.c:487
 #1: ffffffff8c7a4eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
 #1: ffffffff8c7a4eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3e8/0x770 kernel/rcu/tree_exp.h:992
1 lock held by syz-executor.3/7928:
 #0: ffffffff8e102810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4cb/0x8e0 net/core/net_namespace.c:487
2 locks held by syz-executor.5/7914:
 #0: ffffffff8e102810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4cb/0x8e0 net/core/net_namespace.c:487
 #1: ffffffff8c7a4eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:325 [inline]
 #1: ffffffff8c7a4eb8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3e8/0x770 kernel/rcu/tree_exp.h:992
2 locks held by syz-executor.2/7929:
 #0: ffffffff8e102810 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4cb/0x8e0 net/core/net_namespace.c:487
 #1: ffffffff8c7a4d80 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x6a0 kernel/rcu/tree.c:3961

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.3.0-next-20230505-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x29c/0x350 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x2a4/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xe16/0x1090 kernel/hung_task.c:379
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7359 Comm: syz-executor.4 Not tainted 6.3.0-next-20230505-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
RIP: 0010:__sanitizer_cov_trace_switch+0x40/0x90 kernel/kcov.c:340
Code: 48 83 f8 20 74 63 77 44 48 83 f8 08 74 53 48 83 f8 10 75 2f 41 bd 03 00 00 00 4c 8b 75 00 31 db 4d 85 f6 74 1e 48 8b 74 dd 10 <4c> 89 e2 4c 89 ef 48 83 c3 01 48 8b 4c 24 28 e8 1c fe ff ff 49 39
RSP: 0018:ffffc9000394e830 EFLAGS: 00000202
RAX: 0000000000000002 RBX: 0000000000000006 RCX: ffffffff8a01a9bf
RDX: ffff88802646bb80 RSI: 0000000000000070 RDI: 0000000000000001
RBP: ffffffff8b8c23e0 R08: 0000000000000001 R09: 000000000000006f
R10: 0000000000000075 R11: 000000000028ebe8 R12: 0000000000000075
R13: 0000000000000001 R14: 000000000000000a R15: 0000000000000001
FS:  00007f99ef3fe700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97111d2440 CR3: 0000000015329000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 format_decode+0x3df/0xb50 lib/vsprintf.c:2627
 vsnprintf+0x161/0x1710 lib/vsprintf.c:2769
 sprintf+0xc4/0x100 lib/vsprintf.c:3021
 print_time kernel/printk/printk.c:1327 [inline]
 info_print_prefix+0x248/0x340 kernel/printk/printk.c:1353
 record_print_text+0x14d/0x3f0 kernel/printk/printk.c:1402
 printk_get_next_message+0x267/0x710 kernel/printk/printk.c:2809
 console_emit_next_record kernel/printk/printk.c:2844 [inline]
 console_flush_all+0x371/0xcc0 kernel/printk/printk.c:2933
 console_unlock+0xb8/0x1f0 kernel/printk/printk.c:3007
 vprintk_emit+0x1bd/0x600 kernel/printk/printk.c:2307
 vprintk+0x84/0xa0 kernel/printk/printk_safe.c:50
 _printk+0xbf/0xf0 kernel/printk/printk.c:2328
 __reiserfs_warning+0xf9/0x190 fs/reiserfs/prints.c:290
 reiserfs_read_bitmap_block+0x196/0x520 fs/reiserfs/bitmap.c:1434
 scan_bitmap_block.constprop.0+0x1dc/0xfd0 fs/reiserfs/bitmap.c:164
 scan_bitmap fs/reiserfs/bitmap.c:402 [inline]
 allocate_without_wrapping_disk fs/reiserfs/bitmap.c:1161 [inline]
 blocknrs_and_prealloc_arrays_from_search_start fs/reiserfs/bitmap.c:1274 [inline]
 reiserfs_allocate_blocknrs+0x2c9c/0x5790 fs/reiserfs/bitmap.c:1375
 reiserfs_new_unf_blocknrs fs/reiserfs/reiserfs.h:3361 [inline]
 _allocate_block fs/reiserfs/inode.c:645 [inline]
 reiserfs_get_block+0x9da/0x4100 fs/reiserfs/inode.c:756
 __block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064
 reiserfs_write_begin+0x36e/0xa60 fs/reiserfs/inode.c:2773
 generic_perform_write+0x256/0x570 mm/filemap.c:3926
 __generic_file_write_iter+0x2ae/0x500 mm/filemap.c:4054
 generic_file_write_iter+0xe3/0x350 mm/filemap.c:4086
 call_write_iter include/linux/fs.h:1868 [inline]
 do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735
 do_iter_write+0x185/0x7e0 fs/read_write.c:860
 vfs_writev+0x1aa/0x670 fs/read_write.c:933
 do_pwritev+0x1b6/0x270 fs/read_write.c:1030
 __do_sys_pwritev2 fs/read_write.c:1089 [inline]
 __se_sys_pwritev2 fs/read_write.c:1080 [inline]
 __x64_sys_pwritev2+0xef/0x150 fs/read_write.c:1080
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f99f088c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f99ef3fe168 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f99f09abf80 RCX: 00007f99f088c169
RDX: 0000000000000001 RSI: 0000000020001f80 RDI: 0000000000000004
RBP: 00007f99f08e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3c16698f R14: 00007f99ef3fe300 R15: 0000000000022000
 </TASK>