======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.8.677/8588 is trying to acquire lock:
ffff888051edf658 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_reflink+0x596/0xbb0 fs/ocfs2/refcounttree.c:4272

but task is already holding lock:
ffff888051edf6e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_reflink+0x582/0xbb0 fs/ocfs2/refcounttree.c:4271

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
       down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
       ocfs2_init_acl+0x35b/0x840 fs/ocfs2/acl.c:367
       ocfs2_mknod+0x173c/0x2770 fs/ocfs2/namei.c:414
       ocfs2_create+0xf4/0x430 fs/ocfs2/namei.c:677
       lookup_open fs/namei.c:4508 [inline]
       open_last_lookups fs/namei.c:4608 [inline]
       path_openat+0x341f/0x4280 fs/namei.c:4860
       do_file_open+0x20e/0x430 fs/namei.c:4892
       do_sys_openat2+0x10f/0x1e0 fs/open.c:1368
       do_sys_open fs/open.c:1374 [inline]
       __do_sys_creat fs/open.c:1452 [inline]
       __se_sys_creat fs/open.c:1446 [inline]
       __x64_sys_creat+0xcc/0x120 fs/open.c:1446
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
       down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
       ocfs2_start_trans+0x5cc/0x8f0 fs/ocfs2/journal.c:369
       ocfs2_modify_bh+0xbe/0x440 fs/ocfs2/quota_local.c:101
       ocfs2_local_read_info+0xd5c/0x1640 fs/ocfs2/quota_local.c:767
       dquot_load_quota_sb+0x7c1/0x11d0 fs/quota/dquot.c:2484
       dquot_load_quota_inode fs/quota/dquot.c:2521 [inline]
       dquot_load_quota_inode+0x2a3/0x470 fs/quota/dquot.c:2513
       ocfs2_enable_quotas+0x28a/0x5a0 fs/ocfs2/super.c:930
       ocfs2_fill_super.cold+0x1cd/0x3ae fs/ocfs2/super.c:1140
       get_tree_bdev_flags+0x38c/0x620 fs/super.c:1640
       vfs_get_tree+0x92/0x320 fs/super.c:1700
       fc_mount fs/namespace.c:1198 [inline]
       do_new_mount_fc fs/namespace.c:3765 [inline]
       do_new_mount fs/namespace.c:3841 [inline]
       path_mount+0x7d0/0x23d0 fs/namespace.c:4161
       do_mount fs/namespace.c:4174 [inline]
       __do_sys_mount fs/namespace.c:4390 [inline]
       __se_sys_mount fs/namespace.c:4367 [inline]
       __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
       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+0x4bb/0x8f0 fs/ocfs2/journal.c:367
       ocfs2_write_begin_inline fs/ocfs2/aops.c:1460 [inline]
       ocfs2_try_to_write_inline_data fs/ocfs2/aops.c:1564 [inline]
       ocfs2_write_begin_nolock+0x1b4f/0x6be0 fs/ocfs2/aops.c:1650
       ocfs2_write_begin+0x1cb/0x340 fs/ocfs2/aops.c:1885
       generic_perform_write+0x292/0xa40 mm/filemap.c:4358
       __generic_file_write_iter+0x1f7/0x240 mm/filemap.c:4475
       ocfs2_file_write_iter+0xda5/0x2200 fs/ocfs2/file.c:2481
       new_sync_write fs/read_write.c:595 [inline]
       vfs_write+0x6ac/0x1050 fs/read_write.c:687
       ksys_write+0x12a/0x250 fs/read_write.c:739
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){++++}-{4:4}:
       check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
       down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631
       ocfs2_reflink+0x596/0xbb0 fs/ocfs2/refcounttree.c:4272
       ocfs2_vfs_reflink fs/ocfs2/refcounttree.c:4399 [inline]
       ocfs2_reflink_ioctl+0x7cd/0xa60 fs/ocfs2/refcounttree.c:4439
       ocfs2_ioctl+0x5e8/0x6e0 fs/ocfs2/ioctl.c:920
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:597 [inline]
       __se_sys_ioctl fs/ioctl.c:583 [inline]
       __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x115/0x870 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:
  &oi->ip_alloc_sem --> &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(&oi->ip_alloc_sem);

 *** DEADLOCK ***

4 locks held by syz.8.677/8588:
 #0: ffff888050436450 (sb_writers#22){.+.+}-{0:0}, at: filename_create+0x10d/0x400 fs/namei.c:4948
 #1: ffff88806a2717a0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
 #1: ffff88806a2717a0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
 #1: ffff88806a2717a0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
 #1: ffff88806a2717a0 (&type->i_mutex_dir_key#13/1){+.+.}-{4:4}, at: filename_create+0x1c0/0x400 fs/namei.c:4955
 #2: ffff888051edf9a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #2: ffff888051edf9a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ocfs2_vfs_reflink fs/ocfs2/refcounttree.c:4396 [inline]
 #2: ffff888051edf9a0 (&sb->s_type->i_mutex_key#32){+.+.}-{4:4}, at: ocfs2_reflink_ioctl+0x689/0xa60 fs/ocfs2/refcounttree.c:4439
 #3: ffff888051edf6e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_reflink+0x582/0xbb0 fs/ocfs2/refcounttree.c:4271

stack backtrace:
CPU: 0 UID: 0 PID: 8588 Comm: syz.8.677 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3165
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x136c/0x1a40 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1631
 ocfs2_reflink+0x596/0xbb0 fs/ocfs2/refcounttree.c:4272
 ocfs2_vfs_reflink fs/ocfs2/refcounttree.c:4399 [inline]
 ocfs2_reflink_ioctl+0x7cd/0xa60 fs/ocfs2/refcounttree.c:4439
 ocfs2_ioctl+0x5e8/0x6e0 fs/ocfs2/ioctl.c:920
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f074979e019
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:00007f074a66c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0749a25fa0 RCX: 00007f074979e019
RDX: 00002000000001c0 RSI: 0000000040186f04 RDI: 0000000000000005
RBP: 00007f074983500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0749a26038 R14: 00007f0749a25fa0 R15: 00007ffe59399388
 </TASK>