[syzbot] [ntfs3?] INFO: task hung in freeze_super (7)

syzbot
2026-04-03T17:50:26Z

Hello,

syzbot found the following issue on:

HEAD commit: 9147566d8016 Merge tag 'sched_ext-for-7.0-rc6-fixes' of gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=104799f6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=45cb3c58fd963c27
dashboard link: https://syzkaller.appspot.com/bug?extid=5f6ca38579a76e303c1c
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1770e5da580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/1e94b6070465/disk-9147566d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/17cff0253e7d/vmlinux-9147566d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/093d634539c7/bzImage-9147566d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/13739019b74d/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5f6ca38579a76e303c1c@syzkaller.appspotmail.com

INFO: task syz.0.27:6095 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_time[ 319.060152][ T38] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.27 state:D stack:23808 pid:6095 tgid:6094 ppid:5930 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1850 [inline]
freeze_super+0x535/0x1190 fs/super.c:2114
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1542
bdev_freeze+0xd8/0x220 block/bdev.c:314
ntfs_force_shutdown fs/ntfs3/file.c:128 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:146 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:170
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f156ecac819
RSP: 002b:00007f156e30e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f156ef25fa0 RCX: 00007f156ecac819
RDX: 00002000000001c0 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007f156ed42c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f156ef26038 R14: 00007f156ef25fa0 R15: 00007ffd1a50d098
</TASK>
INFO: task syz.4.21:6103 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.21 state:D stack:24864 pid:6103 tgid:6099 ppid:5943 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1850 [inline]
freeze_super+0x535/0x1190 fs/super.c:2114
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1542
bdev_freeze+0xd8/0x220 block/bdev.c:314
ntfs_force_shutdown fs/ntfs3/file.c:128 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:146 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:170
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fdbab55c819
RSP: 002b:00007fdbaabb6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fdbab7d5fa0 RCX: 00007fdbab55c819
RDX: 00002000000001c0 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007fdbab5f2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fdbab7d6038 R14: 00007fdbab7d5fa0 R15: 00007ffcf6319cd8
</TASK>
INFO: task syz.1.34:6120 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.34 state:D stack:25152 pid:6120 tgid:6119 ppid:5933 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1850 [inline]
freeze_super+0x535/0x1190 fs/super.c:2114
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1542
bdev_freeze+0xd8/0x220 block/bdev.c:314
ntfs_force_shutdown fs/ntfs3/file.c:128 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:146 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:170
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3da66dc819
RSP: 002b:00007f3da5d3e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3da6955fa0 RCX: 00007f3da66dc819
RDX: 00002000000001c0 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007f3da6772c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3da6956038 R14: 00007f3da6955fa0 R15: 00007ffc419a2278
</TASK>
INFO: task syz.3.33:6122 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.33 state:D stack:25152 pid:6122 tgid:6121 ppid:5941 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1850 [inline]
freeze_super+0x535/0x1190 fs/super.c:2114
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1542
bdev_freeze+0xd8/0x220 block/bdev.c:314
ntfs_force_shutdown fs/ntfs3/file.c:128 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:146 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:170
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa88583c819
RSP: 002b:00007fa884e9e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa885ab5fa0 RCX: 00007fa88583c819
RDX: 00002000000001c0 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007fa8858d2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa885ab6038 R14: 00007fa885ab5fa0 R15: 00007ffc67496b08
</TASK>
INFO: task syz.2.37:6134 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.37 state:D stack:24928 pid:6134 tgid:6133 ppid:5937 task_flags:0x400140 flags:0x00080002
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
percpu_down_write+0x298/0x330 kernel/locking/percpu-rwsem.c:256
sb_wait_write fs/super.c:1850 [inline]
freeze_super+0x535/0x1190 fs/super.c:2114
fs_bdev_freeze+0x1a3/0x310 fs/super.c:1542
bdev_freeze+0xd8/0x220 block/bdev.c:314
ntfs_force_shutdown fs/ntfs3/file.c:128 [inline]
ntfs_ioctl_shutdown fs/ntfs3/file.c:146 [inline]
ntfs_ioctl+0x53d/0x790 fs/ntfs3/file.c:170
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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbb6228c819
RSP: 002b:00007fbb618ee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb62505fa0 RCX: 00007fbb6228c819
RDX: 00002000000001c0 RSI: 000000008004587d RDI: 0000000000000005
RBP: 00007fbb62322c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbb62506038 R14: 00007fbb62505fa0 R15: 00007ffe46c7d938
</TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8ddcb9c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcb9c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcb9c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5552:
#0: ffff8880289d90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz.0.27/6095:
#0: ffff888022458f10 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff88802ad46480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff88802ad46480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.0.27/6110:
2 locks held by syz.4.21/6103:
#0: ffff888022455150 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff8880319d6480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff8880319d6480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.4.21/6113:
2 locks held by syz.1.34/6120:
#0: ffff8880224581d0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff888035e7c480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff888035e7c480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
4 locks held by syz.1.34/6127:
2 locks held by syz.3.33/6122:
#0: ffff888022455e90 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff888036956480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff888036956480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.3.33/6128:
2 locks held by syz.2.37/6134:
#0: ffff888022456bd0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff8880386d0480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff8880386d0480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.2.37/6135:
2 locks held by syz.5.43/6282:
#0: ffff888022454410 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff888029018480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff888029018480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.5.43/6285:
2 locks held by syz.8.41/6294:
#0: ffff888022451c50 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff8880268e8480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff8880268e8480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.8.41/6302:
2 locks held by syz.9.42/6300:
#0: ffff888022450f10 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff88803bab4480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff88803bab4480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.9.42/6308:
2 locks held by syz.7.46/6305:
#0: ffff888022452990 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff88802ada4480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff88802ada4480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
4 locks held by syz.7.46/6309:
2 locks held by syz.6.47/6307:
#0: ffff8880224536d0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:305
#1: ffff88805fcbe480 (sb_writers#12){++++}-{0:0}, at: sb_wait_write fs/super.c:1850 [inline]
#1: ffff88805fcbe480 (sb_writers#12){++++}-{0:0}, at: freeze_super+0x535/0x1190 fs/super.c:2114
3 locks held by syz.6.47/6311:
1 lock held by syz.1.253/6870:
2 locks held by syz.0.254/6874:
3 locks held by syz.2.255/6877:

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

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 03/18/2026
Call Trace:
<TASK>
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
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6311 Comm: syz.6.47 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:__lock_acquire+0xd4e/0x2cf0 kernel/locking/lockdep.c:-1
Code: ae a8 0b 00 00 41 8b 86 b0 0b 00 00 ff c0 41 89 86 b0 0b 00 00 83 f8 30 0f 83 51 18 00 00 3b 05 f0 1f b6 11 0f 87 a4 18 00 00 <bd> 01 00 00 00 e9 d4 06 00 00 41 83 fe 03 ba 02 00 00 00 41 0f 43
RSP: 0018:ffffc900050ef7a0 EFLAGS: 00000093
RAX: 0000000000000004 RBX: 0000000000047586 RCX: dbcc2cbf40afc457
RDX: 0000000039254800 RSI: 0000000098d7158f RDI: ffff888026179e80
RBP: dbcc2cbf40afc457 R08: ffffffff831455b5 R09: ffff88805ad08948
R10: dffffc0000000000 R11: ffffed100b5a111e R12: ffff88802617aab0
R13: ffff88802617aab0 R14: ffff888026179e80 R15: 0000000000000003
FS: 00007fb0549e56c0(0000) GS:ffff888126436000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000004340 CR3: 000000002a7ba000 CR4: 00000000003526f0
Call Trace:
<TASK>
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
down_read+0x97/0x200 kernel/locking/rwsem.c:1537
attr_data_get_block+0xc5/0x310 fs/ntfs3/attrib.c:964
ntfs_compress_write+0x5a9/0x1c80 fs/ntfs3/file.c:1029
ntfs_file_write_iter+0x517/0x990 fs/ntfs3/file.c:1275
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x629/0xba0 fs/read_write.c:688
ksys_write+0x156/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb0553ac819
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb0549e5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb055626090 RCX: 00007fb0553ac819
RDX: 0000000000000078 RSI: 0000200000004340 RDI: 0000000000000004
RBP: 00007fb055442c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb055626128 R14: 00007fb055626090 R15: 00007fff2faa9a28
</TASK>

---
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