INFO: task syz.8.593:12213 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.593 state:D stack:25208 pid:12213 tgid:12212 ppid:12075 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5260 [inline]
__schedule+0x1472/0x4fe0 kernel/sched/core.c:6867
__schedule_loop kernel/sched/core.c:6949 [inline]
schedule+0x164/0x360 kernel/sched/core.c:6964
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1847 [inline]
freeze_super+0x535/0x1190 fs/super.c:2111
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1539
bdev_freeze+0xd8/0x220 block/bdev.c:315
ntfs_force_shutdown fs/ntfs3/file.c:94 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:112 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:136
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2bab70acb9
RSP: 002b:00007f2ba9966028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f2bab985fa0 RCX: 00007f2bab70acb9
RDX: 0000200000000140 RSI: 000000008004587d RDI: 000000000000000b
RBP: 00007f2bab778bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2bab986038 R14: 00007f2bab985fa0 R15: 00007ffcd687f008
Showing all locks held in the system:
4 locks held by pr/legacy/17:
1 lock held by khungtaskd/38:
#0: ffffffff8dbc77c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8dbc77c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8dbc77c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
1 lock held by udevd/5165:
#0: ffff888037526a08 (&ep->lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:93 [inline]
#0: ffff888037526a08 (&ep->lock){+.+.}-{3:3}, at: ep_poll fs/eventpoll.c:2040 [inline]
#0: ffff888037526a08 (&ep->lock){+.+.}-{3:3}, at: do_epoll_wait+0x851/0xbd0 fs/eventpoll.c:2461
2 locks held by getty/5556:
#0: ffff88814ebe80a0 (&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
3 locks held by syz-executor/12098:
2 locks held by syz.8.593/12213:
#0: ffff888148dd1b50 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:306
#1: ffff88803a024480 (sb_writers#19){++++}-{0:0}, at: sb_wait_write fs/super.c:1847 [inline]
#1: ffff88803a024480 (sb_writers#19){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2111
4 locks held by syz.8.593/12214:
1 lock held by udevd/12277:
1 lock held by udevd/12380:
4 locks held by syz.4.794/13349:
9 locks held by syz.0.795/13351:
1 lock held by syz.9.791/13353:
3 locks held by udevd/13382:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
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+0x726/0x8b0 kernel/kthread.c:463
ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 13353 Comm: syz.9.791 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/13/2026
RIP: 0010:mark_held_locks kernel/locking/lockdep.c:4313 [inline]
RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:4343 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0xb1/0x260 kernel/locking/lockdep.c:4410
Code: 00 65 48 8b 1d 98 a4 86 10 48 8b 83 80 0b 00 00 48 89 83 68 0b 00 00 48 c7 c7 83 3b 35 8d e8 d6 9e 6e 09 65 ff 05 1f eb 86 10 <83> bb 88 0b 00 00 00 0f 8e d1 00 00 00 49 89 de 49 81 c6 90 0b 00
RSP: 0000:ffffc9001f6b7a98 EFLAGS: 00000002
RAX: 0000000000000001 RBX: ffff88802c42bc80 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8d353b83 RDI: ffffffff8b85e800
RBP: ffffc9001f6b7bd8 R08: ffffffff8f47de77 R09: 1ffffffff1e8fbce
R10: dffffc0000000000 R11: fffffbfff1e8fbcf R12: dffffc0000000000
R13: 1ffff92003ed6f64 R14: ffff888031430600 R15: ffff888031430600
FS: 00007f4403c866c0(0000) GS:ffff8881266c9000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f43ff43e000 CR3: 000000002886c000 CR4: 00000000003526f0
Call Trace:
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x30/0x80 kernel/locking/spinlock.c:194
unlock_rt_mutex_safe kernel/locking/rtmutex.c:344 [inline]
rt_mutex_slowunlock+0x4a7/0x8b0 kernel/locking/rtmutex.c:1454
spin_unlock include/linux/spinlock_rt.h:105 [inline]
do_anonymous_page mm/memory.c:5282 [inline]
do_pte_missing+0x1022/0x2e60 mm/memory.c:4402
handle_pte_fault mm/memory.c:6276 [inline]
__handle_mm_fault mm/memory.c:6414 [inline]
handle_mm_fault+0xd0a/0x13c0 mm/memory.c:6583
do_user_addr_fault+0xa73/0x1360 arch/x86/mm/fault.c:1334
handle_page_fault arch/x86/mm/fault.c:1474 [inline]
exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1527
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f44058e288e
Code: c1 49 39 4f 08 72 54 8d 4d ff 85 ed 74 3b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 <47> 0f b6 0c 08 45 84 c9 74 08 45 88 0c 00 49 8b 47 10 48 83 c0 01
RSP: 002b:00007f4403c85470 EFLAGS: 00010206
RAX: 0000000003bd8001 RBX: 00007f4403c85530 RCX: 00000000000000dd
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f4403c855d0
RBP: 0000000000000102 R08: 00007f43fb866000 R09: 0000000003bd8000
R10: 0000000000000000 R11: 00007f4403c85540 R12: 0000000000000001
R13: 00007f4405ad7880 R14: 0000000000000000 R15: 00007f4403c855d0