INFO: task syz-executor:6956 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22216 pid:6956 tgid:6956 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7289
rt_mutex_slowlock_block+0x508/0x680 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2dc/0x7b0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:552
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 include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9d1a21d9d7
RSP: 002b:00007ffe574715c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f9d1a2b2050 RCX: 00007f9d1a21d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe57471680
RBP: 00007ffe57471680 R08: 00007ffe57472680 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe57472710
R13: 00007f9d1a2b2050 R14: 0000000000043f96 R15: 00007ffe57472750
INFO: task syz-executor:7123 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22528 pid:7123 tgid:7123 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7289
rt_mutex_slowlock_block+0x508/0x680 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2dc/0x7b0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:552
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 include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd7d1f0d9d7
RSP: 002b:00007ffe4380a4f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fd7d1fa2050 RCX: 00007fd7d1f0d9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffe4380a5b0
RBP: 00007ffe4380a5b0 R08: 00007ffe4380b5b0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe4380b640
R13: 00007fd7d1fa2050 R14: 0000000000041b83 R15: 00007ffe4380b680
INFO: task syz-executor:7510 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22520 pid:7510 tgid:7510 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7289
rt_mutex_slowlock_block+0x508/0x680 kernel/locking/rtmutex.c:1647
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked kernel/locking/rtmutex.c:1760 [inline]
rt_mutex_slowlock+0x2dc/0x7b0 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:534 [inline]
mutex_lock_nested+0x168/0x1d0 kernel/locking/rtmutex_api.c:552
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 include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f50363ad9d7
RSP: 002b:00007ffc85fb11b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f5036442050 RCX: 00007f50363ad9d7
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc85fb1270
RBP: 00007ffc85fb1270 R08: 00007ffc85fb2270 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc85fb2300
R13: 00007f5036442050 R14: 0000000000042836 R15: 00007ffc85fb2340
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
6 locks held by kworker/u8:4/68:
6 locks held by kworker/u8:10/1310:
2 locks held by getty/5560:
#0: ffff8880294300a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e7e2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz-executor/6665:
#0: ffff8880379780d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880379780d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880379780d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/6956:
#0: ffff88803c6520d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88803c6520d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88803c6520d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7123:
#0: ffff8880352300d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880352300d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880352300d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7302:
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/7510:
#0: ffff888039a060d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888039a060d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888039a060d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8002:
#0: ffff8880655180d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff8880655180d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff8880655180d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8011:
#0: ffff888039b7c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888039b7c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888039b7c0d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
2 locks held by syz-executor/8315:
#0: ffff888063d660d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888063d660d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888063d660d0 (&type->s_umount_key#88){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffffffff8e24dad8 (jfs_log_mutex){+.+.}-{4:4}, at: lmLogClose+0xb4/0x520 fs/jfs/jfs_logmgr.c:1443
1 lock held by syz.0.395/8907:
#0: ffff8880379780d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880379780d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.6.453/9483:
#0: ffff88803c6520d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff88803c6520d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.9.477/9642:
#0: ffff8880352300d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880352300d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by udevd/9652:
#0: ffff8880226b6ea8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1043 [inline]
#0: ffff8880226b6ea8 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x2ff/0x440 block/fops.c:854
8 locks held by syz-executor/9689:
1 lock held by syz.5.490/9715:
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
1 lock held by syz.5.490/9754:
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880613220d0 (&type->s_umount_key#88){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
2 locks held by syz.7.494/9768:
1 lock held by syz.3.492/9771:
2 locks held by rm/9795:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1310 Comm: kworker/u8:10 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: btrfs-endio-meta simple_end_io_work
RIP: 0010:__bfs kernel/locking/lockdep.c:1815 [inline]
RIP: 0010:__bfs_backwards kernel/locking/lockdep.c:1860 [inline]
RIP: 0010:check_irq_usage kernel/locking/lockdep.c:2796 [inline]
RIP: 0010:check_prev_add kernel/locking/lockdep.c:3169 [inline]
RIP: 0010:check_prevs_add kernel/locking/lockdep.c:3284 [inline]
RIP: 0010:validate_chain kernel/locking/lockdep.c:3908 [inline]
RIP: 0010:__lock_acquire+0x197b/0x2cf0 kernel/locking/lockdep.c:5237
Code: 13 25 ff 0f 00 00 39 05 ef b5 b5 11 73 06 89 05 e7 b5 b5 11 48 8b 02 48 89 df 4c 39 e8 0f 84 2c fe ff ff 4c 89 60 30 48 8b 00 <4c> 39 e8 75 f4 48 89 df e9 18 fe ff ff 48 89 fb 48 c7 c7 10 8c c9
RSP: 0018:ffffc9000614f3e0 EFLAGS: 00000002
RAX: ffffffff95e4e478 RBX: 00000000000003cd RCX: 0000000000000426
RDX: ffffffff95d9b738 RSI: ffff8880296ce800 RDI: 00000000000003cd
RBP: 5733f1d507faf35c R08: ffffc9000614f3a8 R09: 0000000000000020
R10: dffffc0000000000 R11: ffffffff81a0a3c0 R12: ffffffff95da6398
R13: ffffffff92f75a10 R14: ffff8880296cdb80 R15: 0000000000000425
FS: 0000000000000000(0000) GS:ffff88812633c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca6bd3c000 CR3: 000000007d952000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
do_write_seqcount_begin_nested include/linux/seqlock.h:478 [inline]
do_write_seqcount_begin include/linux/seqlock.h:504 [inline]
psi_write_begin+0xab/0x160 kernel/sched/psi.c:183
psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
psi_sched_switch kernel/sched/stats.h:225 [inline]
__schedule+0x2632/0x5240 kernel/sched/core.c:6905
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7095
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
class_preempt_destructor include/linux/preempt.h:468 [inline]
try_to_wake_up+0x832/0x1380 kernel/sched/core.c:4249
autoremove_wake_function kernel/sched/wait.c:403 [inline]
wake_bit_function+0xe5/0x210 kernel/sched/wait_bit.c:34
__wake_up_common kernel/sched/wait.c:108 [inline]
__wake_up_common_lock+0x136/0x1e0 kernel/sched/wait.c:125
__wake_up kernel/sched/wait.c:146 [inline]
__wake_up_bit kernel/sched/wait_bit.c:129 [inline]
wake_up_bit+0xfb/0x150 kernel/sched/wait_bit.c:160
clear_and_wake_up_bit include/linux/wait_bit.h:555 [inline]
clear_extent_buffer_reading fs/btrfs/extent_io.c:3836 [inline]
end_bbio_meta_read+0x158/0x1f0 fs/btrfs/extent_io.c:3862
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245