INFO: task syz-executor155:5674 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor155 state:D stack:25736 pid:5674  tgid:5674  ppid:5669   task_flags:0x400140 flags:0x00080801
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
 lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
 jfs_umount+0x2da/0x3b0 fs/jfs/jfs_umount.c:124
 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x140/0x2d0 fs/super.c:723
 kill_block_super+0x44/0xa0 fs/super.c:1852
 deactivate_locked_super+0xbe/0x110 fs/super.c:558
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396
 task_work_run+0x1d9/0x260 kernel/task_work.c:233
 ptrace_notify+0x258/0x290 kernel/signal.c:2598
 ptrace_report_syscall include/linux/ptrace.h:416 [inline]
 ptrace_report_syscall_exit+0x2d/0x50 include/linux/ptrace.h:477
 arch_ptrace_report_syscall_exit include/linux/entry-common.h:240 [inline]
 syscall_exit_work include/linux/entry-common.h:273 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:304 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:341 [inline]
 do_syscall_64+0x4a0/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7888be7627
RSP: 002b:00007ffc90ce7f08 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000032e92 RCX: 00007f7888be7627
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc90ce7fc0
RBP: 00007ffc90ce7fc0 R08: 00007ffc90ce8fc0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc90ce9030
R13: 0000555589d02830 R14: 431bde82d7b634db R15: 00007ffc90ce9050
 </TASK>
INFO: task syz-executor155:5675 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor155 state:D stack:26696 pid:5675  tgid:5675  ppid:5669   task_flags:0x400140 flags:0x00080801
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
 lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
 jfs_umount+0x2da/0x3b0 fs/jfs/jfs_umount.c:124
 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x140/0x2d0 fs/super.c:723
 kill_block_super+0x44/0xa0 fs/super.c:1852
 deactivate_locked_super+0xbe/0x110 fs/super.c:558
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396
 task_work_run+0x1d9/0x260 kernel/task_work.c:233
 ptrace_notify+0x258/0x290 kernel/signal.c:2598
 ptrace_report_syscall include/linux/ptrace.h:416 [inline]
 ptrace_report_syscall_exit+0x2d/0x50 include/linux/ptrace.h:477
 arch_ptrace_report_syscall_exit include/linux/entry-common.h:240 [inline]
 syscall_exit_work include/linux/entry-common.h:273 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:304 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:341 [inline]
 do_syscall_64+0x4a0/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7888be7627
RSP: 002b:00007ffc90ce7f08 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000032e9b RCX: 00007f7888be7627
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc90ce7fc0
RBP: 00007ffc90ce7fc0 R08: 00007ffc90ce8fc0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc90ce9030
R13: 0000555589d02830 R14: 431bde82d7b634db R15: 00007ffc90ce9050
 </TASK>
INFO: task syz-executor155:5677 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor155 state:D stack:26008 pid:5677  tgid:5677  ppid:5669   task_flags:0x400140 flags:0x00080801
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x17dd/0x5830 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
 lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
 jfs_umount+0x2da/0x3b0 fs/jfs/jfs_umount.c:124
 jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
 generic_shutdown_super+0x140/0x2d0 fs/super.c:723
 kill_block_super+0x44/0xa0 fs/super.c:1852
 deactivate_locked_super+0xbe/0x110 fs/super.c:558
 cleanup_mnt+0x204/0x2a0 fs/namespace.c:1396
 task_work_run+0x1d9/0x260 kernel/task_work.c:233
 ptrace_notify+0x258/0x290 kernel/signal.c:2598
 ptrace_report_syscall include/linux/ptrace.h:416 [inline]
 ptrace_report_syscall_exit+0x2d/0x50 include/linux/ptrace.h:477
 arch_ptrace_report_syscall_exit include/linux/entry-common.h:240 [inline]
 syscall_exit_work include/linux/entry-common.h:273 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:304 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:341 [inline]
 do_syscall_64+0x4a0/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7888be7627
RSP: 002b:00007ffc90ce7f08 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000032ea7 RCX: 00007f7888be7627
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc90ce7fc0
RBP: 00007ffc90ce7fc0 R08: 00007ffc90ce8fc0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000202 R12: 00007ffc90ce9030
R13: 0000555589d02830 R14: 431bde82d7b634db R15: 00007ffc90ce9050
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/33: 1, last CPU#0:
 #0: ffffffff9015a2a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff9015a2a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff9015a2a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by kworker/u8:3/50: 2, on CPU#1:
 #0: ffff88813fe4c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88813fe4c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88813fe4c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #0: ffff88813fe4c148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
 #1: ffffc90000bb7c40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc90000bb7c40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc90000bb7c40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3460 [inline]
 #1: ffffc90000bb7c40 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3578
locks held by getty/5383: 2, on CPU#1:
 #0: ffff8880333840a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322e2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor155/5671: 2, on CPU#0:
 #0: ffff88807e110100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807e110100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807e110100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
 #1: ffffffff90625a20 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
locks held by syz-executor155/5672: 2, on CPU#0:
 #0: ffff88807c440100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807c440100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807c440100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
 #1: ffffffff90625a20 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
locks held by syz-executor155/5673: 1, on CPU#1:
 #0: ffff88807c284100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807c284100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807c284100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
locks held by syz-executor155/5674: 2, on CPU#0:
 #0: ffff88807e6c2100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807e6c2100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807e6c2100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
 #1: ffffffff90625a20 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
locks held by syz-executor155/5675: 2, on CPU#0:
 #0: ffff888078fe6100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff888078fe6100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff888078fe6100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
 #1: ffffffff90625a20 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441
locks held by syz-executor155/5677: 2, on CPU#0:
 #0: ffff88807dc5c100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88807dc5c100 (&type->s_umount_key#44){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88807dc5c100 (&type->s_umount_key#44){+.+.}-{4:4}, at: deactivate_super+0xac/0xe0 fs/super.c:585
 #1: ffffffff90625a20 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1441

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:377 [inline]
 watchdog+0x1073/0x10f0 kernel/hung_task.c:598
 kthread+0x38b/0x480 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: fb 93 02 e9 0e 5f 0c f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 aa 25 00 fb f4 <e9> e7 5e 0c f5 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e40 EFLAGS: 00000242
RAX: 000000000006d86b RBX: ffffffff819c9880 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e6a814b RDI: ffffffff8c8e9e80
RBP: ffffc90000197f10 R08: ffff8880b8333d9b R09: 1ffff110170667b3
R10: dffffc0000000000 R11: ffffed10170667b4 R12: 0000000000000000
R13: 1ffff11003dd5000 R14: 1ffff92000032fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888123511000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000564ea6b95660 CR3: 0000000035389000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:458
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>