INFO: task syz-executor:7548 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:20328 pid:7548 tgid:7548 ppid:1 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x153e/0x4fe0 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7061
__mutex_lock_common kernel/locking/mutex.c:692 [inline]
__mutex_lock+0x7fe/0x1300 kernel/locking/mutex.c:776
lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
jfs_umount+0x2ef/0x3c0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
kill_block_super+0x44/0x90 fs/super.c:1725
deactivate_locked_super+0xbc/0x130 fs/super.c:476
cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
task_work_run+0x1d9/0x270 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2b7/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcccd59bf17
RSP: 002b:00007ffd43d0e8c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fcccd60471f RCX: 00007fcccd59bf17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd43d0e980
RBP: 00007ffd43d0e980 R08: 00007ffd43d0f980 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd43d0fa10
R13: 00007fcccd60471f R14: 000000000003d0af R15: 00007ffd43d0fa50
Showing all locks held in the system:
1 lock held by khungtaskd/30:
#0: ffffffff8e55dd60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8e55dd60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8e55dd60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5582:
#0: ffff888032b010a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/5823:
#0: ffff888028bc80e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888028bc80e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888028bc80e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7548:
#0: ffff8880372720e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880372720e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880372720e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8327:
#0: ffff88807f6f00e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88807f6f00e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88807f6f00e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8492:
#0: ffff8880363840e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880363840e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880363840e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz.0.433/8607:
#0: ffff8880358420e0 (&type->s_umount_key#57/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xab0 fs/super.c:345
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by kworker/u8:33/9019:
#0: ffff88801d72f148 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x855/0x15a0 kernel/workqueue.c:3254
#1: ffffc9000b61fc40 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x87c/0x15a0 kernel/workqueue.c:3255
2 locks held by syz-executor/9888:
#0: ffff88804cf380e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88804cf380e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88804cf380e0 (&type->s_umount_key#63){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e9e4008 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
3 locks held by kworker/1:18/10513:
1 lock held by syz.8.802/10613:
#0: ffff8880372720e0 (&type->s_umount_key#63){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880372720e0 (&type->s_umount_key#63){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xf90/0xfe0 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:pick_task_fair+0x24c/0x2a0 kernel/sched/fair.c:8912
Code: 74 12 44 89 e1 80 e1 07 38 c1 7c 08 4c 89 e7 e8 ca 5a 95 00 40 b5 01 41 f6 04 24 01 0f 85 7a fe ff ff eb a1 31 c0 48 83 c4 18 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 83 c0 80 f6 c3
RSP: 0018:ffffc90000197be8 EFLAGS: 00000086
RAX: ffff88802f623c80 RBX: 0000000000000000 RCX: 1ffff11005ec47b6
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff88802bf08850
RBP: 0000000000000000 R08: ffffffff8fefddb7 R09: 1ffffffff1fdfbb6
R10: dffffc0000000000 R11: ffffffff819592d0 R12: 0000000000000000
R13: dffffc0000000000 R14: 1ffff110170e758a R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8881257ef000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002c000 CR3: 000000002b6d8000 CR4: 00000000003526f0
Call Trace:
pick_task kernel/sched/core.c:5994 [inline]
pick_next_task kernel/sched/core.c:6096 [inline]
__schedule+0x30fd/0x4fe0 kernel/sched/core.c:6848
schedule_idle+0x51/0x90 kernel/sched/core.c:7030
do_idle+0x499/0x500 kernel/sched/idle.c:360
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147