======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.4.296/8258 is trying to acquire lock:
ffff88806b4e3a10 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933

but task is already holding lock:
ffff88806b4e3a98 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340 fs/ocfs2/refcounttree.c:932

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1537
       ocfs2_init_acl+0x1c3/0x800 fs/ocfs2/acl.c:367
       ocfs2_mknod+0x1423/0x2210 fs/ocfs2/namei.c:414
       ocfs2_create+0x195/0x440 fs/ocfs2/namei.c:677
       lookup_open fs/namei.c:4483 [inline]
       open_last_lookups fs/namei.c:4583 [inline]
       path_openat+0x13b4/0x38a0 fs/namei.c:4827
       do_file_open+0x23e/0x4a0 fs/namei.c:4859
       do_sys_openat2+0x113/0x200 fs/open.c:1366
       do_sys_open fs/open.c:1372 [inline]
       __do_sys_openat fs/open.c:1388 [inline]
       __se_sys_openat fs/open.c:1383 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1383
       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

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x97/0x200 kernel/locking/rwsem.c:1537
       ocfs2_start_trans+0x3ac/0x700 fs/ocfs2/journal.c:372
       ocfs2_modify_bh+0xe3/0x4d0 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0x1454/0x1810 fs/ocfs2/quota_local.c:767
       dquot_load_quota_sb+0x791/0xbd0 fs/quota/dquot.c:2462
       dquot_load_quota_inode+0x2e1/0x5d0 fs/quota/dquot.c:2499
       ocfs2_enable_quotas+0x1c8/0x4a0 fs/ocfs2/super.c:930
       ocfs2_fill_super+0x5340/0x6920 fs/ocfs2/super.c:1140
       get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1694
       vfs_get_tree+0x92/0x2a0 fs/super.c:1754
       fc_mount fs/namespace.c:1193 [inline]
       do_new_mount_fc fs/namespace.c:3760 [inline]
       do_new_mount+0x341/0xd30 fs/namespace.c:3836
       do_mount fs/namespace.c:4159 [inline]
       __do_sys_mount fs/namespace.c:4348 [inline]
       __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
       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

-> #1 (sb_internal#2){.+.+}-{0:0}:
       percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
       percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
       __sb_start_write include/linux/fs/super.h:19 [inline]
       sb_start_intwrite include/linux/fs/super.h:177 [inline]
       ocfs2_start_trans+0x2ac/0x700 fs/ocfs2/journal.c:370
       ocfs2_acquire_dquot+0x445/0xb20 fs/ocfs2/quota_global.c:860
       dqget+0x7b6/0xf10 fs/quota/dquot.c:980
       dquot_set_dqblk+0x2b/0xfa0 fs/quota/dquot.c:2823
       quota_setquota+0x4e0/0x590 fs/quota/quota.c:310
       __do_sys_quotactl fs/quota/quota.c:960 [inline]
       __se_sys_quotactl+0x2cd/0x9c0 fs/quota/quota.c:916
       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

-> #0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
       lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
       down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
       ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933
       ocfs2_xattr_set+0x61a/0x13e0 fs/ocfs2/xattr.c:3699
       ocfs2_set_acl+0x701/0x7b0 fs/ocfs2/acl.c:255
       ocfs2_iop_set_acl+0x1b1/0x2b0 fs/ocfs2/acl.c:287
       set_posix_acl fs/posix_acl.c:955 [inline]
       vfs_remove_acl+0x54e/0x840 fs/posix_acl.c:1242
       ovl_do_remove_acl fs/overlayfs/overlayfs.h:355 [inline]
       ovl_workdir_create+0x5b3/0x940 fs/overlayfs/super.c:369
       ovl_make_workdir fs/overlayfs/super.c:682 [inline]
       ovl_get_workdir fs/overlayfs/super.c:840 [inline]
       ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
       ovl_fill_super+0x1a1e/0x5e60 fs/overlayfs/super.c:1567
       vfs_get_super fs/super.c:1327 [inline]
       get_tree_nodev+0xbb/0x150 fs/super.c:1346
       vfs_get_tree+0x92/0x2a0 fs/super.c:1754
       fc_mount fs/namespace.c:1193 [inline]
       do_new_mount_fc fs/namespace.c:3760 [inline]
       do_new_mount+0x341/0xd30 fs/namespace.c:3836
       do_mount fs/namespace.c:4159 [inline]
       __do_sys_mount fs/namespace.c:4348 [inline]
       __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
       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

other info that might help us debug this:

Chain exists of:
  &ocfs2_quota_ip_alloc_sem_key --> &journal->j_trans_barrier --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(&journal->j_trans_barrier);
                               lock(&oi->ip_xattr_sem);
  lock(&ocfs2_quota_ip_alloc_sem_key);

 *** DEADLOCK ***

4 locks held by syz.4.296/8258:
 #0: ffff888035d700d0 (&type->s_umount_key#65/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xac0 fs/super.c:345
 #1: ffff888024374480 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
 #2: ffff88806b4e3dc0 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
 #2: ffff88806b4e3dc0 (&sb->s_type->i_mutex_key#24){++++}-{4:4}, at: vfs_remove_acl+0x10b/0x840 fs/posix_acl.c:1223
 #3: ffff88806b4e3a98 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340 fs/ocfs2/refcounttree.c:932

stack backtrace:
CPU: 0 UID: 0 PID: 8258 Comm: syz.4.296 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2043
 check_noncircular+0x12e/0x150 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x15a5/0x2cf0 kernel/locking/lockdep.c:5237
 lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
 down_write+0x3a/0x50 kernel/locking/rwsem.c:1590
 ocfs2_try_remove_refcount_tree+0xb6/0x340 fs/ocfs2/refcounttree.c:933
 ocfs2_xattr_set+0x61a/0x13e0 fs/ocfs2/xattr.c:3699
 ocfs2_set_acl+0x701/0x7b0 fs/ocfs2/acl.c:255
 ocfs2_iop_set_acl+0x1b1/0x2b0 fs/ocfs2/acl.c:287
 set_posix_acl fs/posix_acl.c:955 [inline]
 vfs_remove_acl+0x54e/0x840 fs/posix_acl.c:1242
 ovl_do_remove_acl fs/overlayfs/overlayfs.h:355 [inline]
 ovl_workdir_create+0x5b3/0x940 fs/overlayfs/super.c:369
 ovl_make_workdir fs/overlayfs/super.c:682 [inline]
 ovl_get_workdir fs/overlayfs/super.c:840 [inline]
 ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
 ovl_fill_super+0x1a1e/0x5e60 fs/overlayfs/super.c:1567
 vfs_get_super fs/super.c:1327 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1346
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3760 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3836
 do_mount fs/namespace.c:4159 [inline]
 __do_sys_mount fs/namespace.c:4348 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
 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: 0033:0x7faa234ebf79
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:00007faa2173e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007faa23765fa0 RCX: 00007faa234ebf79
RDX: 0000200000000080 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007faa235827e0 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faa23766038 R14: 00007faa23765fa0 R15: 00007ffd19599e58
 </TASK>
overlayfs: upper fs does not support tmpfile.
overlayfs: upper fs does not support RENAME_WHITEOUT.
------------[ cut here ]------------
UBSAN: array-index-out-of-bounds in fs/ocfs2/xattr.c:1985:3
index 2 is out of range for type 'struct ocfs2_xattr_entry[] __counted_by(xh_count)' (aka 'struct ocfs2_xattr_entry[]')
CPU: 0 UID: 0 PID: 8258 Comm: syz.4.296 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 ubsan_epilogue+0xa/0x30 lib/ubsan.c:233
 __ubsan_handle_out_of_bounds+0xe8/0xf0 lib/ubsan.c:455
 ocfs2_xa_remove_entry+0x49e/0x670 fs/ocfs2/xattr.c:1985
 ocfs2_xa_remove fs/ocfs2/xattr.c:2073 [inline]
 ocfs2_xa_set+0xdb2/0x2ec0 fs/ocfs2/xattr.c:2277
 ocfs2_xattr_block_set+0x3e0/0x3350 fs/ocfs2/xattr.c:3015
 __ocfs2_xattr_set_handle+0x262/0xf50 fs/ocfs2/xattr.c:-1
 ocfs2_xattr_set+0xf3f/0x13e0 fs/ocfs2/xattr.c:3680
 __vfs_removexattr+0x431/0x470 fs/xattr.c:518
 __vfs_removexattr_locked+0xe2/0x280 fs/xattr.c:553
 vfs_removexattr+0x7f/0x230 fs/xattr.c:575
 ovl_do_removexattr fs/overlayfs/overlayfs.h:335 [inline]
 ovl_removexattr fs/overlayfs/overlayfs.h:343 [inline]
 ovl_make_workdir fs/overlayfs/super.c:760 [inline]
 ovl_get_workdir fs/overlayfs/super.c:840 [inline]
 ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline]
 ovl_fill_super+0x4c39/0x5e60 fs/overlayfs/super.c:1567
 vfs_get_super fs/super.c:1327 [inline]
 get_tree_nodev+0xbb/0x150 fs/super.c:1346
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3760 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3836
 do_mount fs/namespace.c:4159 [inline]
 __do_sys_mount fs/namespace.c:4348 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4325
 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: 0033:0x7faa234ebf79
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:00007faa2173e028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007faa23765fa0 RCX: 00007faa234ebf79
RDX: 0000200000000080 RSI: 0000200000000040 RDI: 0000000000000000
RBP: 00007faa235827e0 R08: 0000200000000440 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faa23766038 R14: 00007faa23765fa0 R15: 00007ffd19599e58
 </TASK>
---[ end trace ]---