syzbot

======================================================
WARNING: possible circular locking dependency detected
6.1.28-syzkaller #0 Not tainted
------------------------------------------------------
kworker/u4:39/5457 is trying to acquire lock:
ffff888039d40120 (&wnd->rw_lock/1){+.+.}-{3:3}, at: ntfs_mark_rec_free+0x3b/0x2b0 fs/ntfs3/fsntfs.c:713

but task is already holding lock:
ffff888072fa6840 (&ni->ni_lock){+.+.}-{3:3}, at: ni_trylock fs/ntfs3/ntfs_fs.h:1124 [inline]
ffff888072fa6840 (&ni->ni_lock){+.+.}-{3:3}, at: ni_write_inode+0x151/0x1240 fs/ntfs3/frecord.c:3240

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ni->ni_lock){+.+.}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669
       __mutex_lock_common+0x1d4/0x2520 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:799
       ntfs_set_state+0x217/0x6f0 fs/ntfs3/fsntfs.c:920
       attr_set_size+0x32e5/0x42f0 fs/ntfs3/attrib.c:880
       ntfs_extend_mft+0x2f6/0x4b0 fs/ntfs3/fsntfs.c:498
       ntfs_look_free_mft+0x439/0x10c0 fs/ntfs3/fsntfs.c:561
       ni_create_attr_list+0x9d0/0x1510 fs/ntfs3/frecord.c:873
       ni_ins_attr_ext+0x330/0xbf0 fs/ntfs3/frecord.c:968
       ni_insert_attr+0x354/0x900 fs/ntfs3/frecord.c:1135
       ni_insert_resident+0xf4/0x3c0 fs/ntfs3/frecord.c:1519
       ntfs_set_ea+0xa70/0x16b0 fs/ntfs3/xattr.c:398
       ntfs_save_wsl_perm+0x139/0x490 fs/ntfs3/xattr.c:929
       ntfs3_setattr+0x961/0xb70 fs/ntfs3/file.c:817
       notify_change+0xdcd/0x1080 fs/attr.c:482
       chown_common+0x5aa/0x900 fs/open.c:736
       do_fchownat+0x169/0x240 fs/open.c:767
       __do_sys_lchown fs/open.c:792 [inline]
       __se_sys_lchown fs/open.c:790 [inline]
       __x64_sys_lchown+0x81/0x90 fs/open.c:790
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #1 (&ni->file.run_lock#2){++++}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ntfs_extend_mft+0x15c/0x4b0 fs/ntfs3/fsntfs.c:482
       ntfs_look_free_mft+0x439/0x10c0 fs/ntfs3/fsntfs.c:561
       ni_create_attr_list+0x9d0/0x1510 fs/ntfs3/frecord.c:873
       ni_ins_attr_ext+0x330/0xbf0 fs/ntfs3/frecord.c:968
       ni_insert_attr+0x354/0x900 fs/ntfs3/frecord.c:1135
       ni_insert_resident+0xf4/0x3c0 fs/ntfs3/frecord.c:1519
       ntfs_set_ea+0xa70/0x16b0 fs/ntfs3/xattr.c:398
       ntfs_save_wsl_perm+0x139/0x490 fs/ntfs3/xattr.c:929
       ntfs3_setattr+0x961/0xb70 fs/ntfs3/file.c:817
       notify_change+0xdcd/0x1080 fs/attr.c:482
       chown_common+0x5aa/0x900 fs/open.c:736
       do_fchownat+0x169/0x240 fs/open.c:767
       __do_sys_lchown fs/open.c:792 [inline]
       __se_sys_lchown fs/open.c:790 [inline]
       __x64_sys_lchown+0x81/0x90 fs/open.c:790
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&wnd->rw_lock/1){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3832
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669
       down_write_nested+0x39/0x60 kernel/locking/rwsem.c:1689
       ntfs_mark_rec_free+0x3b/0x2b0 fs/ntfs3/fsntfs.c:713
       ni_write_inode+0x433/0x1240 fs/ntfs3/frecord.c:3332
       write_inode fs/fs-writeback.c:1443 [inline]
       __writeback_single_inode+0x67d/0x11e0 fs/fs-writeback.c:1655
       writeback_sb_inodes+0xc21/0x1ac0 fs/fs-writeback.c:1881
       wb_writeback+0x49d/0xe10 fs/fs-writeback.c:2055
       wb_do_writeback fs/fs-writeback.c:2198 [inline]
       wb_workfn+0x427/0x1020 fs/fs-writeback.c:2238
       process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2289
       worker_thread+0xa5f/0x1210 kernel/workqueue.c:2436
       kthread+0x26e/0x300 kernel/kthread.c:376
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

other info that might help us debug this:

Chain exists of:
  &wnd->rw_lock/1 --> &ni->file.run_lock#2 --> &ni->ni_lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ni->ni_lock);
                               lock(&ni->file.run_lock#2);
                               lock(&ni->ni_lock);
  lock(&wnd->rw_lock/1);

 *** DEADLOCK ***

3 locks held by kworker/u4:39/5457:
 #0: ffff888015aa6938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x77a/0x11f0
 #1: ffffc900061b7d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x7bd/0x11f0 kernel/workqueue.c:2264
 #2: ffff888072fa6840 (&ni->ni_lock){+.+.}-{3:3}, at: ni_trylock fs/ntfs3/ntfs_fs.h:1124 [inline]
 #2: ffff888072fa6840 (&ni->ni_lock){+.+.}-{3:3}, at: ni_write_inode+0x151/0x1240 fs/ntfs3/frecord.c:3240

stack backtrace:
CPU: 0 PID: 5457 Comm: kworker/u4:39 Not tainted 6.1.28-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023
Workqueue: writeback wb_workfn (flush-7:5)
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3832
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669
 down_write_nested+0x39/0x60 kernel/locking/rwsem.c:1689
 ntfs_mark_rec_free+0x3b/0x2b0 fs/ntfs3/fsntfs.c:713
 ni_write_inode+0x433/0x1240 fs/ntfs3/frecord.c:3332
 write_inode fs/fs-writeback.c:1443 [inline]
 __writeback_single_inode+0x67d/0x11e0 fs/fs-writeback.c:1655
 writeback_sb_inodes+0xc21/0x1ac0 fs/fs-writeback.c:1881
 wb_writeback+0x49d/0xe10 fs/fs-writeback.c:2055
 wb_do_writeback fs/fs-writeback.c:2198 [inline]
 wb_workfn+0x427/0x1020 fs/fs-writeback.c:2238
 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2289
 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2436
 kthread+0x26e/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>