syzbot

======================================================
WARNING: possible circular locking dependency detected
6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0 Not tainted
------------------------------------------------------
kswapd0/87 is trying to acquire lock:
ffff888084010100 (&rl->lock){++++}-{3:3}, at: __ntfs_clear_inode+0x24/0x260 fs/ntfs/inode.c:2189

but task is already holding lock:
ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6771

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:3692 [inline]
       fs_reclaim_acquire+0x100/0x150 mm/page_alloc.c:3706
       might_alloc include/linux/sched/mm.h:303 [inline]
       prepare_alloc_pages.constprop.0+0x155/0x550 mm/page_alloc.c:4338
       __alloc_pages+0x193/0x2440 mm/page_alloc.c:4556
       alloc_pages_mpol+0x258/0x5f0 mm/mempolicy.c:2133
       folio_alloc+0x1e/0xe0 mm/mempolicy.c:2211
       filemap_alloc_folio+0x3bb/0x490 mm/filemap.c:975
       do_read_cache_folio+0x1b8/0x540 mm/filemap.c:3667
       do_read_cache_page mm/filemap.c:3769 [inline]
       read_cache_page+0x5b/0x160 mm/filemap.c:3778
       read_mapping_page include/linux/pagemap.h:888 [inline]
       ntfs_map_page fs/ntfs/aops.h:75 [inline]
       map_mft_record_page fs/ntfs/mft.c:73 [inline]
       map_mft_record+0x1dd/0x730 fs/ntfs/mft.c:156
       ntfs_read_locked_inode+0x19b/0x5860 fs/ntfs/inode.c:550
       ntfs_iget+0x130/0x180 fs/ntfs/inode.c:177
       ntfs_lookup+0x312/0xc30 fs/ntfs/namei.c:117
       __lookup_slow+0x24d/0x450 fs/namei.c:1693
       lookup_slow fs/namei.c:1710 [inline]
       walk_component+0x349/0x5a0 fs/namei.c:2001
       lookup_last fs/namei.c:2458 [inline]
       path_lookupat+0x17f/0x770 fs/namei.c:2482
       filename_lookup+0x1e7/0x5b0 fs/namei.c:2511
       vfs_statx+0x13e/0x550 fs/stat.c:244
       vfs_fstatat+0xb3/0x140 fs/stat.c:304
       __do_sys_newfstatat+0x98/0x110 fs/stat.c:468
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x63/0x6b

-> #1 (&ni->mrec_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x175/0x9d0 kernel/locking/mutex.c:752
       map_mft_record+0x4a/0x730 fs/ntfs/mft.c:154
       ntfs_truncate+0x263/0x2a20 fs/ntfs/inode.c:2383
       ntfs_truncate_vfs fs/ntfs/inode.c:2864 [inline]
       ntfs_setattr+0x44d/0x640 fs/ntfs/inode.c:2916
       notify_change+0x742/0x11c0 fs/attr.c:499
       do_truncate+0x15c/0x220 fs/open.c:66
       handle_truncate fs/namei.c:3299 [inline]
       do_open fs/namei.c:3645 [inline]
       path_openat+0x24b6/0x2990 fs/namei.c:3798
       do_filp_open+0x1de/0x430 fs/namei.c:3825
       do_sys_openat2+0x176/0x1e0 fs/open.c:1404
       do_sys_open fs/open.c:1419 [inline]
       __do_sys_openat fs/open.c:1435 [inline]
       __se_sys_openat fs/open.c:1430 [inline]
       __x64_sys_openat+0x175/0x210 fs/open.c:1430
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x63/0x6b

-> #0 (&rl->lock){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2445/0x3b30 kernel/locking/lockdep.c:5137
       lock_acquire kernel/locking/lockdep.c:5754 [inline]
       lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
       __ntfs_clear_inode+0x24/0x260 fs/ntfs/inode.c:2189
       ntfs_evict_big_inode+0x29e/0x530 fs/ntfs/inode.c:2278
       evict+0x2ed/0x6b0 fs/inode.c:665
       dispose_list+0x117/0x1e0 fs/inode.c:698
       prune_icache_sb+0xeb/0x150 fs/inode.c:883
       super_cache_scan+0x372/0x540 fs/super.c:223
       do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
       shrink_slab_memcg mm/shrinker.c:548 [inline]
       shrink_slab+0xa83/0x1310 mm/shrinker.c:626
       shrink_one+0x48f/0x7b0 mm/vmscan.c:4767
       shrink_many mm/vmscan.c:4828 [inline]
       lru_gen_shrink_node mm/vmscan.c:4929 [inline]
       shrink_node+0x2149/0x3740 mm/vmscan.c:5888
       kswapd_shrink_node mm/vmscan.c:6693 [inline]
       balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883
       kswapd+0x5be/0xbf0 mm/vmscan.c:7143
       kthread+0x2c6/0x3a0 kernel/kthread.c:388
       ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

other info that might help us debug this:

Chain exists of:
  &rl->lock --> &ni->mrec_lock --> fs_reclaim

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&ni->mrec_lock);
                               lock(fs_reclaim);
  lock(&rl->lock);

 *** DEADLOCK ***

2 locks held by kswapd0/87:
 #0: ffffffff8d320a00 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0x160/0x1a90 mm/vmscan.c:6771
 #1: ffff88802ddbe0e0 (&type->s_umount_key#71){++++}-{3:3}, at: super_trylock_shared fs/super.c:566 [inline]
 #1: ffff88802ddbe0e0 (&type->s_umount_key#71){++++}-{3:3}, at: super_cache_scan+0x96/0x540 fs/super.c:196

stack backtrace:
CPU: 1 PID: 87 Comm: kswapd0 Not tainted 6.8.0-rc1-syzkaller-00026-g7ed2632ec7d7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 check_noncircular+0x317/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2445/0x3b30 kernel/locking/lockdep.c:5137
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1579
 __ntfs_clear_inode+0x24/0x260 fs/ntfs/inode.c:2189
 ntfs_evict_big_inode+0x29e/0x530 fs/ntfs/inode.c:2278
 evict+0x2ed/0x6b0 fs/inode.c:665
 dispose_list+0x117/0x1e0 fs/inode.c:698
 prune_icache_sb+0xeb/0x150 fs/inode.c:883
 super_cache_scan+0x372/0x540 fs/super.c:223
 do_shrink_slab+0x428/0x1120 mm/shrinker.c:435
 shrink_slab_memcg mm/shrinker.c:548 [inline]
 shrink_slab+0xa83/0x1310 mm/shrinker.c:626
 shrink_one+0x48f/0x7b0 mm/vmscan.c:4767
 shrink_many mm/vmscan.c:4828 [inline]
 lru_gen_shrink_node mm/vmscan.c:4929 [inline]
 shrink_node+0x2149/0x3740 mm/vmscan.c:5888
 kswapd_shrink_node mm/vmscan.c:6693 [inline]
 balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883
 kswapd+0x5be/0xbf0 mm/vmscan.c:7143
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>