======================================================
WARNING: possible circular locking dependency detected
6.0.0-rc6-syzkaller-00281-g1707c39ae309 #0 Not tainted
------------------------------------------------------
kswapd0/129 is trying to acquire lock:
ffff88801aa9e990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14a0 fs/jbd2/transaction.c:461

but task is already holding lock:
ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze_unsafe include/linux/freezer.h:58 [inline]
ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze include/linux/freezer.h:67 [inline]
ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xd1e/0x1580 mm/vmscan.c:4291

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:4674 [inline]
       fs_reclaim_acquire+0x115/0x160 mm/page_alloc.c:4688
       might_alloc include/linux/sched/mm.h:271 [inline]
       slab_pre_alloc_hook mm/slab.h:700 [inline]
       slab_alloc_node mm/slub.c:3162 [inline]
       __kmalloc_node+0x5b/0x380 mm/slub.c:4473
       kmalloc_node include/linux/slab.h:623 [inline]
       kvmalloc_node+0x3e/0x190 mm/util.c:613
       kvmalloc include/linux/slab.h:750 [inline]
       ext4_xattr_inode_cache_find fs/ext4/xattr.c:1481 [inline]
       ext4_xattr_inode_lookup_create fs/ext4/xattr.c:1524 [inline]
       ext4_xattr_set_entry+0x1d94/0x3980 fs/ext4/xattr.c:1665
       ext4_xattr_ibody_set+0x12d/0x3a0 fs/ext4/xattr.c:2225
       ext4_xattr_set_handle+0x964/0x1500 fs/ext4/xattr.c:2382
       ext4_xattr_set+0x13a/0x340 fs/ext4/xattr.c:2495
       __vfs_setxattr+0x115/0x180 fs/xattr.c:182
       __vfs_setxattr_noperm+0x125/0x5f0 fs/xattr.c:216
       __vfs_setxattr_locked+0x1cf/0x260 fs/xattr.c:277
       vfs_setxattr+0x11e/0x3c0 fs/xattr.c:313
       setxattr+0x146/0x160 fs/xattr.c:623
       path_setxattr+0x197/0x1c0 fs/xattr.c:642
       __do_sys_setxattr fs/xattr.c:658 [inline]
       __se_sys_setxattr fs/xattr.c:654 [inline]
       __ia32_sys_setxattr+0xbc/0x150 fs/xattr.c:654
       do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
       __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
       do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
       entry_SYSENTER_compat_after_hwframe+0x70/0x82

-> #1 (&ei->xattr_sem){++++}-{3:3}:
       down_write+0x90/0x150 kernel/locking/rwsem.c:1552
       ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
       ext4_xattr_set_handle+0x15c/0x1500 fs/ext4/xattr.c:2309
       __ext4_set_acl+0x338/0x570 fs/ext4/acl.c:217
       ext4_set_acl+0x443/0x580 fs/ext4/acl.c:258
       set_posix_acl+0x22d/0x2e0 fs/posix_acl.c:1015
       posix_acl_xattr_set+0x135/0x1a0 fs/posix_acl.c:1034
       __vfs_removexattr+0xfe/0x170 fs/xattr.c:483
       __vfs_removexattr_locked+0x1ac/0x440 fs/xattr.c:518
       vfs_removexattr+0xcb/0x250 fs/xattr.c:540
       ovl_do_removexattr fs/overlayfs/overlayfs.h:270 [inline]
       ovl_workdir_create+0x486/0x930 fs/overlayfs/super.c:815
       ovl_make_workdir fs/overlayfs/super.c:1369 [inline]
       ovl_get_workdir fs/overlayfs/super.c:1519 [inline]
       ovl_fill_super+0x1950/0x62b0 fs/overlayfs/super.c:2075
       mount_nodev+0x60/0x110 fs/super.c:1446
       legacy_get_tree+0x105/0x220 fs/fs_context.c:610
       vfs_get_tree+0x89/0x2f0 fs/super.c:1530
       do_new_mount fs/namespace.c:3040 [inline]
       path_mount+0x1326/0x1e20 fs/namespace.c:3370
       do_mount fs/namespace.c:3383 [inline]
       __do_sys_mount fs/namespace.c:3591 [inline]
       __se_sys_mount fs/namespace.c:3568 [inline]
       __ia32_sys_mount+0x27e/0x300 fs/namespace.c:3568
       do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
       __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
       do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
       entry_SYSENTER_compat_after_hwframe+0x70/0x82

-> #0 (jbd2_handle){++++}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3095 [inline]
       check_prevs_add kernel/locking/lockdep.c:3214 [inline]
       validate_chain kernel/locking/lockdep.c:3829 [inline]
       __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053
       lock_acquire kernel/locking/lockdep.c:5666 [inline]
       lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
       start_this_handle+0xfe7/0x14a0 fs/jbd2/transaction.c:463
       jbd2__journal_start+0x38c/0x910 fs/jbd2/transaction.c:520
       __ext4_journal_start_sb+0x3a3/0x490 fs/ext4/ext4_jbd2.c:105
       __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
       ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5963
       __mark_inode_dirty+0x48b/0x1040 fs/fs-writeback.c:2381
       mark_inode_dirty_sync include/linux/fs.h:2467 [inline]
       iput.part.0+0x57/0x810 fs/inode.c:1771
       iput+0x58/0x70 fs/inode.c:1764
       dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
       __dentry_kill+0x3c0/0x640 fs/dcache.c:607
       shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201
       prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282
       super_cache_scan+0x336/0x590 fs/super.c:104
       do_shrink_slab+0x428/0xbd0 mm/vmscan.c:831
       shrink_slab+0x17c/0x6f0 mm/vmscan.c:991
       shrink_node_memcgs mm/vmscan.c:3182 [inline]
       shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304
       kswapd_shrink_node mm/vmscan.c:4086 [inline]
       balance_pgdat+0x8ef/0x1580 mm/vmscan.c:4277
       kswapd+0x79b/0xf80 mm/vmscan.c:4537
       kthread+0x2e4/0x3a0 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:
  jbd2_handle --> &ei->xattr_sem --> fs_reclaim

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(fs_reclaim);
                               lock(&ei->xattr_sem);
                               lock(fs_reclaim);
  lock(jbd2_handle);

 *** DEADLOCK ***

3 locks held by kswapd0/129:
 #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze_unsafe include/linux/freezer.h:58 [inline]
 #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: try_to_freeze include/linux/freezer.h:67 [inline]
 #0: ffffffff8c0c4480 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xd1e/0x1580 mm/vmscan.c:4291
 #1: ffffffff8c084490 (shrinker_rwsem){++++}-{3:3}, at: shrink_slab+0xc9/0x6f0 mm/vmscan.c:981
 #2: ffff88801ad6c0e0 (&type->s_umount_key#31){++++}-{3:3}, at: trylock_super fs/super.c:415 [inline]
 #2: ffff88801ad6c0e0 (&type->s_umount_key#31){++++}-{3:3}, at: super_cache_scan+0x6c/0x590 fs/super.c:79

stack backtrace:
CPU: 3 PID: 129 Comm: kswapd0 Not tainted 6.0.0-rc6-syzkaller-00281-g1707c39ae309 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3095 [inline]
 check_prevs_add kernel/locking/lockdep.c:3214 [inline]
 validate_chain kernel/locking/lockdep.c:3829 [inline]
 __lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5053
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 start_this_handle+0xfe7/0x14a0 fs/jbd2/transaction.c:463
 jbd2__journal_start+0x38c/0x910 fs/jbd2/transaction.c:520
 __ext4_journal_start_sb+0x3a3/0x490 fs/ext4/ext4_jbd2.c:105
 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
 ext4_dirty_inode+0x9d/0x110 fs/ext4/inode.c:5963
 __mark_inode_dirty+0x48b/0x1040 fs/fs-writeback.c:2381
 mark_inode_dirty_sync include/linux/fs.h:2467 [inline]
 iput.part.0+0x57/0x810 fs/inode.c:1771
 iput+0x58/0x70 fs/inode.c:1764
 dentry_unlink_inode+0x2b1/0x460 fs/dcache.c:401
 __dentry_kill+0x3c0/0x640 fs/dcache.c:607
 shrink_dentry_list+0x23c/0x800 fs/dcache.c:1201
 prune_dcache_sb+0xe7/0x140 fs/dcache.c:1282
 super_cache_scan+0x336/0x590 fs/super.c:104
 do_shrink_slab+0x428/0xbd0 mm/vmscan.c:831
 shrink_slab+0x17c/0x6f0 mm/vmscan.c:991
 shrink_node_memcgs mm/vmscan.c:3182 [inline]
 shrink_node+0x8c9/0x1e80 mm/vmscan.c:3304
 kswapd_shrink_node mm/vmscan.c:4086 [inline]
 balance_pgdat+0x8ef/0x1580 mm/vmscan.c:4277
 kswapd+0x79b/0xf80 mm/vmscan.c:4537
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>