Re: [f2fs-dev] [syzbot] [f2fs?] INFO: task hung in freeze_super (6)

[Chao Yu via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>]

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/chao/linux.git bugfix/syzbot

On 5/21/25 14:35, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    3c21441eeffc Merge tag 'acpi-6.15-rc7' of git://git.kernel..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=176b22d4580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ea35e429f965296e
> dashboard link: https://syzkaller.appspot.com/bug?extid=aa5bb5f6860e08a60450
> compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=167d2ef4580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13a81f68580000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/57d40aff8cb0/disk-3c21441e.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/9f367fd8bfd5/vmlinux-3c21441e.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/4e70f31a61dc/bzImage-3c21441e.xz
> mounted in repro: https://storage.googleapis.com/syzbot-assets/9e197e7beb8c/mount_0.gz
>   fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=11108ef4580000)
> 
> The issue was bisected to:
> 
> commit 84b5bb8bf0f6a78c232a20c2eecdbb8112ac2703
> Author: Qi Han <hanqi@vivo.com>
> Date:   Fri Oct 25 09:18:23 2024 +0000
> 
>     f2fs: modify f2fs_is_checkpoint_ready logic to allow more data to be written with the CP disable
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10f45ef4580000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12f45ef4580000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14f45ef4580000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+aa5bb5f6860e08a60450@syzkaller.appspotmail.com
> Fixes: 84b5bb8bf0f6 ("f2fs: modify f2fs_is_checkpoint_ready logic to allow more data to be written with the CP disable")
> 
> INFO: task syz-executor328:5836 blocked for more than 143 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:23432 pid:5836  tgid:5832  ppid:5826   task_flags:0x400140 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  percpu_down_write+0x28e/0x330 kernel/locking/percpu-rwsem.c:253
>  sb_wait_write fs/super.c:1855 [inline]
>  freeze_super+0x4c2/0xeb0 fs/super.c:2044
>  fs_bdev_freeze+0x19f/0x310 fs/super.c:1484
>  bdev_freeze+0xd8/0x220 block/bdev.c:298
>  f2fs_do_shutdown+0x23d/0x5c0 fs/f2fs/file.c:2367
>  f2fs_ioc_shutdown fs/f2fs/file.c:2459 [inline]
>  __f2fs_ioctl+0x3de9/0xae80 fs/f2fs/file.c:4558
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:906 [inline]
>  __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b55f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386c8 RCX: 00007f836b5ab109
> RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000005
> RBP: 00007f836b6386c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> INFO: task syz-executor328:5856 blocked for more than 144 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:24392 pid:5856  tgid:5832  ppid:5826   task_flags:0x400040 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  io_schedule+0x81/0xe0 kernel/sched/core.c:7742
>  f2fs_balance_fs+0x4b4/0x780 fs/f2fs/segment.c:444
>  f2fs_map_blocks+0x3af1/0x43b0 fs/f2fs/data.c:1791
>  f2fs_expand_inode_data+0x653/0xaf0 fs/f2fs/file.c:1872
>  f2fs_fallocate+0x4f5/0x990 fs/f2fs/file.c:1975
>  vfs_fallocate+0x6a0/0x830 fs/open.c:338
>  ioctl_preallocate fs/ioctl.c:290 [inline]
>  file_ioctl fs/ioctl.c:-1 [inline]
>  do_vfs_ioctl+0x1b8f/0x1eb0 fs/ioctl.c:885
>  __do_sys_ioctl fs/ioctl.c:904 [inline]
>  __se_sys_ioctl+0x82/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b53e218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386d8 RCX: 00007f836b5ab109
> RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004
> RBP: 00007f836b6386d0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> INFO: task syz-executor328:5894 blocked for more than 145 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:24152 pid:5894  tgid:5892  ppid:5825   task_flags:0x400140 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  percpu_down_write+0x28e/0x330 kernel/locking/percpu-rwsem.c:253
>  sb_wait_write fs/super.c:1855 [inline]
>  freeze_super+0x4c2/0xeb0 fs/super.c:2044
>  fs_bdev_freeze+0x19f/0x310 fs/super.c:1484
>  bdev_freeze+0xd8/0x220 block/bdev.c:298
>  f2fs_do_shutdown+0x23d/0x5c0 fs/f2fs/file.c:2367
>  f2fs_ioc_shutdown fs/f2fs/file.c:2459 [inline]
>  __f2fs_ioctl+0x3de9/0xae80 fs/f2fs/file.c:4558
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:906 [inline]
>  __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b55f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386c8 RCX: 00007f836b5ab109
> RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000005
> RBP: 00007f836b6386c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> INFO: task syz-executor328:5907 blocked for more than 145 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:25432 pid:5907  tgid:5892  ppid:5825   task_flags:0x400040 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  io_schedule+0x81/0xe0 kernel/sched/core.c:7742
>  f2fs_balance_fs+0x4b4/0x780 fs/f2fs/segment.c:444
>  f2fs_map_blocks+0x3af1/0x43b0 fs/f2fs/data.c:1791
>  f2fs_expand_inode_data+0x653/0xaf0 fs/f2fs/file.c:1872
>  f2fs_fallocate+0x4f5/0x990 fs/f2fs/file.c:1975
>  vfs_fallocate+0x6a0/0x830 fs/open.c:338
>  ioctl_preallocate fs/ioctl.c:290 [inline]
>  file_ioctl fs/ioctl.c:-1 [inline]
>  do_vfs_ioctl+0x1b8f/0x1eb0 fs/ioctl.c:885
>  __do_sys_ioctl fs/ioctl.c:904 [inline]
>  __se_sys_ioctl+0x82/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b53e218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386d8 RCX: 00007f836b5ab109
> RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004
> RBP: 00007f836b6386d0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> INFO: task syz-executor328:5896 blocked for more than 147 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:25144 pid:5896  tgid:5893  ppid:5827   task_flags:0x400140 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  percpu_down_write+0x28e/0x330 kernel/locking/percpu-rwsem.c:253
>  sb_wait_write fs/super.c:1855 [inline]
>  freeze_super+0x4c2/0xeb0 fs/super.c:2044
>  fs_bdev_freeze+0x19f/0x310 fs/super.c:1484
>  bdev_freeze+0xd8/0x220 block/bdev.c:298
>  f2fs_do_shutdown+0x23d/0x5c0 fs/f2fs/file.c:2367
>  f2fs_ioc_shutdown fs/f2fs/file.c:2459 [inline]
>  __f2fs_ioctl+0x3de9/0xae80 fs/f2fs/file.c:4558
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:906 [inline]
>  __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b55f218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386c8 RCX: 00007f836b5ab109
> RDX: 0000200000000080 RSI: 000000008004587d RDI: 0000000000000005
> RBP: 00007f836b6386c0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> INFO: task syz-executor328:5908 blocked for more than 147 seconds.
>       Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0
> "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> task:syz-executor328 state:D stack:24984 pid:5908  tgid:5893  ppid:5827   task_flags:0x400040 flags:0x00004006
> Call Trace:
>  <TASK>
>  context_switch kernel/sched/core.c:5382 [inline]
>  __schedule+0x168f/0x4c70 kernel/sched/core.c:6767
>  __schedule_loop kernel/sched/core.c:6845 [inline]
>  schedule+0x165/0x360 kernel/sched/core.c:6860
>  io_schedule+0x81/0xe0 kernel/sched/core.c:7742
>  f2fs_balance_fs+0x4b4/0x780 fs/f2fs/segment.c:444
>  f2fs_map_blocks+0x3af1/0x43b0 fs/f2fs/data.c:1791
>  f2fs_expand_inode_data+0x653/0xaf0 fs/f2fs/file.c:1872
>  f2fs_fallocate+0x4f5/0x990 fs/f2fs/file.c:1975
>  vfs_fallocate+0x6a0/0x830 fs/open.c:338
>  ioctl_preallocate fs/ioctl.c:290 [inline]
>  file_ioctl fs/ioctl.c:-1 [inline]
>  do_vfs_ioctl+0x1b8f/0x1eb0 fs/ioctl.c:885
>  __do_sys_ioctl fs/ioctl.c:904 [inline]
>  __se_sys_ioctl+0x82/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f836b5ab109
> RSP: 002b:00007f836b53e218 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f836b6386d8 RCX: 00007f836b5ab109
> RDX: 00002000000000c0 RSI: 0000000040305828 RDI: 0000000000000004
> RBP: 00007f836b6386d0 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f836b604668
> R13: 00002000000000c0 R14: 0000200000000180 R15: 00002000000000e0
>  </TASK>
> 
> Showing all locks held in the system:
> 3 locks held by kworker/u8:1/13:
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
>  #1: ffffc90000127c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
>  #1: ffffc90000127c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
>  #2: ffff888079b0a0e0 (&type->s_umount_key#43){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
> 1 lock held by khungtaskd/31:
>  #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
>  #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
>  #0: ffffffff8df3dce0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6764
> 5 locks held by kworker/u8:2/36:
> 3 locks held by kworker/u8:3/53:
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
>  #1: ffffc90000be7c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
>  #1: ffffc90000be7c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
>  #2: ffff8880240c40e0 (&type->s_umount_key#43){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
> 3 locks held by kworker/u8:5/969:
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3213 [inline]
>  #0: ffff888143ad3148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b1/0x17a0 kernel/workqueue.c:3319
>  #1: ffffc90003787c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3214 [inline]
>  #1: ffffc90003787c60 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ec/0x17a0 kernel/workqueue.c:3319
>  #2: ffff8880230a20e0 (&type->s_umount_key#43){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:562
> 2 locks held by getty/5576:
>  #0: ffff888030c370a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
>  #1: ffffc900036e32f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
> 2 locks held by syz-executor328/5836:
>  #0: ffff888022856930 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
>  #1: ffff8880230a2420 (sb_writers#9){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline]
>  #1: ffff8880230a2420 (sb_writers#9){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044
> 3 locks held by syz-executor328/5856:
>  #0: ffff8880230a2420 (sb_writers#9){++++}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
>  #0: ffff8880230a2420 (sb_writers#9){++++}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:337
>  #1: ffff888078bcbfd8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
>  #1: ffff888078bcbfd8 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: f2fs_fallocate+0x24e/0x990 fs/f2fs/file.c:1940
>  #2: ffff888033c5d4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
>  #2: ffff888033c5d4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_expand_inode_data+0x430/0xaf0 fs/f2fs/file.c:1839
> 2 locks held by syz-executor328/5894:
>  #0: ffff888022855db0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
>  #1: ffff888079b0a420 (sb_writers#9){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline]
>  #1: ffff888079b0a420 (sb_writers#9){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044
> 3 locks held by syz-executor328/5907:
>  #0: ffff888079b0a420 (sb_writers#9){++++}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
>  #0: ffff888079b0a420 (sb_writers#9){++++}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:337
>  #1: ffff888074156398 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
>  #1: ffff888074156398 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: f2fs_fallocate+0x24e/0x990 fs/f2fs/file.c:1940
>  #2: ffff888079f554f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
>  #2: ffff888079f554f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_expand_inode_data+0x430/0xaf0 fs/f2fs/file.c:1839
> 2 locks held by syz-executor328/5896:
>  #0: ffff8880228574b0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
>  #1: ffff8880240c4420 (sb_writers#9){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline]
>  #1: ffff8880240c4420 (sb_writers#9){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044
> 3 locks held by syz-executor328/5908:
>  #0: ffff8880240c4420 (sb_writers#9){++++}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
>  #0: ffff8880240c4420 (sb_writers#9){++++}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:337
>  #1: ffff888074157578 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
>  #1: ffff888074157578 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: f2fs_fallocate+0x24e/0x990 fs/f2fs/file.c:1940
>  #2: ffff88807f9ad4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
>  #2: ffff88807f9ad4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_expand_inode_data+0x430/0xaf0 fs/f2fs/file.c:1839
> 2 locks held by syz-executor328/6364:
>  #0: ffff8880228546b0 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
>  #1: ffff88807dedc420 (sb_writers#9){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline]
>  #1: ffff88807dedc420 (sb_writers#9){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044
> 3 locks held by syz-executor328/6374:
>  #0: ffff88807dedc420 (sb_writers#9){++++}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
>  #0: ffff88807dedc420 (sb_writers#9){++++}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:337
>  #1: ffff88806d35a508 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
>  #1: ffff88806d35a508 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: f2fs_fallocate+0x24e/0x990 fs/f2fs/file.c:1940
>  #2: ffff888079e4d4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
>  #2: ffff888079e4d4f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_expand_inode_data+0x430/0xaf0 fs/f2fs/file.c:1839
> 2 locks held by syz-executor328/6379:
>  #0: ffff888022855230 (&bdev->bd_fsfreeze_mutex){+.+.}-{4:4}, at: bdev_freeze+0x2a/0x220 block/bdev.c:289
>  #1: ffff888033604420 (sb_writers#9){++++}-{0:0}, at: sb_wait_write fs/super.c:1855 [inline]
>  #1: ffff888033604420 (sb_writers#9){++++}-{0:0}, at: freeze_super+0x4c2/0xeb0 fs/super.c:2044
> 3 locks held by syz-executor328/6382:
>  #0: ffff888033604420 (sb_writers#9){++++}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline]
>  #0: ffff888033604420 (sb_writers#9){++++}-{0:0}, at: vfs_fallocate+0x62a/0x830 fs/open.c:337
>  #1: ffff88806d037578 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
>  #1: ffff88806d037578 (&sb->s_type->i_mutex_key#14){+.+.}-{4:4}, at: f2fs_fallocate+0x24e/0x990 fs/f2fs/file.c:1940
>  #2: ffff8880286b14f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
>  #2: ffff8880286b14f8 (&sbi->pin_sem){+.+.}-{4:4}, at: f2fs_expand_inode_data+0x430/0xaf0 fs/f2fs/file.c:1839
> 
> =============================================
> 
> NMI backtrace for cpu 0
> CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0 PREEMPT(full) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
>  nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
>  nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
>  trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
>  check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
>  watchdog+0xfee/0x1030 kernel/hung_task.c:437
>  kthread+0x70e/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
>  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: 5905 Comm: f2fs_gc-7:4 Not tainted 6.15.0-rc6-syzkaller-00208-g3c21441eeffc #0 PREEMPT(full) 
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
> Code: 89 fb e8 23 00 00 00 48 8b 3d 5c c3 d5 0b 48 89 de 5b e9 33 41 55 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0c 25 08 70 72 92 65 8b 15 18 7f
> RSP: 0018:ffffc90004697b90 EFLAGS: 00000206
> RAX: ffffffff818dcd2c RBX: ffff88802fa49e00 RCX: 0000000000000000
> RDX: ffff88802fa49e00 RSI: 0000000000200000 RDI: 0000000000000000
> RBP: 0000000000200000 R08: ffff88803342a007 R09: 1ffff11006685400
> R10: dffffc0000000000 R11: ffffed1006685401 R12: ffff88807f9ac000
> R13: dffffc0000000000 R14: ffff88802fa49e2c R15: dffffc0000000000
> FS:  0000000000000000(0000) GS:ffff8881261f9000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f836b5fec18 CR3: 000000000dd38000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  to_kthread kernel/kthread.c:84 [inline]
>  kthread_should_stop+0x59/0xf0 kernel/kthread.c:169
>  gc_thread_func+0x344/0x2b30 fs/f2fs/gc.c:49
>  kthread+0x70e/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
> 
> 
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 
> If the report is already addressed, let syzbot know by replying with:
> #syz fix: exact-commit-title
> 
> If you want syzbot to run the reproducer, reply with:
> #syz test: git://repo/address.git branch-or-commit-hash
> If you attach or paste a git patch, syzbot will apply it before testing.
> 
> If you want to overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
> 
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
> 
> If you want to undo deduplication, reply with:
> #syz undup



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