INFO: task kworker/u4:3:49 blocked for more than 143 seconds.
      Not tainted 6.8.0-rc1-next-20240124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:3    state:D stack:24824 pid:49    tgid:49    ppid:2      flags:0x00004000
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5400 [inline]
 __schedule+0xf15/0x5ce0 kernel/sched/core.c:6727
 __schedule_loop kernel/sched/core.c:6804 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6819
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6876
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752
 jfs_commit_inode+0x233/0x570 fs/jfs/inode.c:102
 jfs_write_inode+0x100/0x240 fs/jfs/inode.c:132
 write_inode fs/fs-writeback.c:1498 [inline]
 __writeback_single_inode+0xa9a/0xe90 fs/fs-writeback.c:1715
 writeback_sb_inodes+0x5a6/0x1090 fs/fs-writeback.c:1941
 __writeback_inodes_wb+0xff/0x2e0 fs/fs-writeback.c:2012
 wb_writeback+0x7fe/0xab0 fs/fs-writeback.c:2119
 wb_check_background_flush fs/fs-writeback.c:2189 [inline]
 wb_do_writeback fs/fs-writeback.c:2277 [inline]
 wb_workfn+0x876/0xfe0 fs/fs-writeback.c:2304
 process_one_work+0x8d5/0x16e0 kernel/workqueue.c:2633
 process_scheduled_works kernel/workqueue.c:2707 [inline]
 worker_thread+0x8b6/0x1290 kernel/workqueue.c:2788
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8d7b0c20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #0: ffffffff8d7b0c20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #0: ffffffff8d7b0c20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
4 locks held by kworker/u4:3/49:
 #0: ffff8880192d9538 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x7ba/0x16e0 kernel/workqueue.c:2608
 #1: ffffc90000b9fd80 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x824/0x16e0 kernel/workqueue.c:2609
 #2: ffff88802449e0e0 (&type->s_umount_key#42){.+.+}-{3:3}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:566
 #3: ffff888077e39448 (&jfs_ip->commit_mutex){+.+.}-{3:3}, at: jfs_commit_inode+0x233/0x570 fs/jfs/inode.c:102
2 locks held by getty/4808:
 #0: ffff88801e0e00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
4 locks held by syz-executor311/5056:

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc1-next-20240124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf86/0x1210 kernel/hung_task.c:379
 kthread+0x2c1/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5056 Comm: syz-executor311 Not tainted 6.8.0-rc1-next-20240124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:get_current arch/x86/include/asm/current.h:49 [inline]
RIP: 0010:write_comp_data+0x9/0x90 kernel/kcov.c:235
Code: 80 f0 15 00 00 c3 cc cc cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 <65> 48 8b 15 5f 9d 77 7e 65 8b 05 60 9d 77 7e a9 00 01 ff 00 74 0f
RSP: 0018:ffffc9000362f580 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802188a000 RCX: ffffffff830a6674
RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff888077e396b0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000006 R11: 006605ff00000020 R12: 0000000000000006
R13: ffff88802188a0c0 R14: 0000000000000080 R15: dffffc0000000000
FS:  0000555555c38380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffff33bccfc CR3: 000000001e6f6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 dtSplitRoot+0x9d4/0x1760 fs/jfs/jfs_dtree.c:1978
 dtSplitUp+0x129c/0x5850 fs/jfs/jfs_dtree.c:990
 dtInsert+0x876/0xb00 fs/jfs/jfs_dtree.c:868
 jfs_mkdir+0x669/0xb30 fs/jfs/namei.c:270
 vfs_mkdir+0x57d/0x820 fs/namei.c:4120
 do_mkdirat+0x301/0x3a0 fs/namei.c:4143
 __do_sys_mkdir fs/namei.c:4163 [inline]
 __se_sys_mkdir fs/namei.c:4161 [inline]
 __x64_sys_mkdir+0xf1/0x140 fs/namei.c:4161
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f9706fedad7
Code: ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 53 00 00 00 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:00007ffcd5e4eb58 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000500 RCX: 00007f9706fedad7
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 0000000020000500
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcd5e4ebf0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.732 msecs