======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.1285/9036 is trying to acquire lock:
ffff8880602e8098 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:455 [inline]
ffff8880602e8098 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x1aa/0x9d0 fs/ocfs2/refcounttree.c:490

but task is already holding lock:
ffff88807b544da0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x3d4/0x740 fs/ocfs2/file.c:2696

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #5 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       ocfs2_create_local_dquot+0x199/0x18d0 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x822/0xb30 fs/ocfs2/quota_global.c:871
       dqget+0x713/0xbb0 fs/quota/dquot.c:1010
       __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1539
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0x90e/0x2460 fs/ocfs2/namei.c:311
       ocfs2_create+0x192/0x420 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3513 [inline]
       open_last_lookups fs/namei.c:3583 [inline]
       path_openat+0x120a/0x2fb0 fs/namei.c:3790
       do_filp_open+0x1df/0x400 fs/namei.c:3820
       do_sys_openat2+0x14b/0x500 fs/open.c:1255
       do_sys_open fs/open.c:1271 [inline]
       __do_sys_creat fs/open.c:1347 [inline]
       __se_sys_creat fs/open.c:1341 [inline]
       __x64_sys_creat+0x8c/0xb0 fs/open.c:1341
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #4 (&dquot->dq_lock){+.+.}-{3:3}
:
       __mutex_lock_common+0x1e5/0x2400 kernel/locking/mutex.c:596
       __mutex_lock kernel/locking/mutex.c:729 [inline]
       mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
       dquot_commit+0x5a/0x410 fs/quota/dquot.c:532
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6212
       mark_dquot_dirty fs/quota/dquot.c:397 [inline]
       mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:437
       __dquot_alloc_space+0x5cb/0xe10 fs/quota/dquot.c:1774
       dquot_alloc_space_nodirty include/linux/quotaops.h:290 [inline]
       dquot_alloc_space include/linux/quotaops.h:303 [inline]
       dquot_alloc_block include/linux/quotaops.h:327 [inline]
       ext4_mb_new_blocks+0xf80/0x47c0 fs/ext4/mballoc.c:5750
       ext4_ext_map_blocks+0x17d1/0x63d0 fs/ext4/extents.c:4372
       ext4_map_blocks+0x97f/0x1a50 fs/ext4/inode.c:675
       ext4_getblk+0x176/0x670 fs/ext4/inode.c:872
       ext4_bread+0x26/0x180 fs/ext4/inode.c:925
       ext4_append+0x2bb/0x560 fs/ext4/namei.c:83
       ext4_init_new_dir+0x2a7/0x910 fs/ext4/namei.c:3032
       ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3078
       vfs_mkdir+0x386/0x570 fs/namei.c:4116
       do_mkdirat+0x1dd/0x5c0 fs/namei.c:4141
       __do_sys_mkdirat fs/namei.c:4156 [inline]
       __se_sys_mkdirat fs/namei.c:4154 [inline]
       __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4154
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #3 (
&ei->i_data_sem){++++}-{3:3}:
       down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
       ext4_map_blocks+0x350/0x1a50 fs/ext4/inode.c:600
       ext4_append+0x22d/0x560 fs/ext4/namei.c:75
       ext4_init_new_dir+0x2a7/0x910 fs/ext4/namei.c:3032
       ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3078
       vfs_mkdir+0x386/0x570 fs/namei.c:4116
       do_mkdirat+0x1dd/0x5c0 fs/namei.c:4141
       __do_sys_mkdir fs/namei.c:4161 [inline]
       __se_sys_mkdir fs/namei.c:4159 [inline]
       __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4159
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #2 (
jbd2_handle){++++}-{0:0}:
       jbd2_journal_lock_updates+0xa4/0x390 fs/jbd2/transaction.c:881
       __ocfs2_flush_truncate_log+0x2b4/0x1110 fs/ocfs2/alloc.c:6027
       ocfs2_flush_truncate_log+0x4b/0x60 fs/ocfs2/alloc.c:6074
       ocfs2_sync_fs+0x119/0x330 fs/ocfs2/super.c:403
       sync_filesystem+0x1be/0x220 fs/sync.c:66
       generic_shutdown_super+0x6b/0x300 fs/super.c:448
       kill_block_super+0x7c/0xe0 fs/super.c:1438
       deactivate_locked_super+0x93/0xf0 fs/super.c:335
       cleanup_mnt+0x426/0x4d0 fs/namespace.c:1148
       task_work_run+0x125/0x1a0 kernel/task_work.c:188
       tracehook_notify_resume include/linux/tracehook.h:189 [inline]
       exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:184
       exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
       __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
       syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
       do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}:
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       inode_lock include/linux/fs.h:793 [inline]
       ocfs2_remove_btree_range+0x64f/0x15e0 fs/ocfs2/alloc.c:5742
       ocfs2_commit_truncate+0xb62/0x1d30 fs/ocfs2/alloc.c:7346
       ocfs2_truncate_file+0xd89/0x1540 fs/ocfs2/file.c:505
       ocfs2_setattr+0x1545/0x1b40 fs/ocfs2/file.c:1215
       notify_change+0xbc6/0xee0 fs/attr.c:505
       do_truncate+0x1ac/0x240 fs/open.c:65
       do_sys_ftruncate+0x31b/0x3d0 fs/open.c:193
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #0 (&new->rf_sem){+.+.}-{3:3}
:
       check_prev_add kernel/locking/lockdep.c:3120 [inline]
       check_prevs_add kernel/locking/lockdep.c:3239 [inline]
       validate_chain kernel/locking/lockdep.c:3855 [inline]
       __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120
       lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
       down_write+0x38/0x60 kernel/locking/rwsem.c:1551
       __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:455 [inline]
       ocfs2_lock_refcount_tree+0x1aa/0x9d0 fs/ocfs2/refcounttree.c:490
       ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4605 [inline]
       ocfs2_reflink_remap_blocks+0xcec/0x1ab0 fs/ocfs2/refcounttree.c:4742
       ocfs2_remap_file_range+0x4a7/0x740 fs/ocfs2/file.c:2706
       do_clone_file_range+0x265/0x2d0 fs/remap_range.c:395
       vfs_clone_file_range+0x1ee/0x4f0 fs/remap_range.c:413
       ioctl_file_clone fs/ioctl.c:242 [inline]
       ioctl_file_clone_range fs/ioctl.c:262 [inline]
       do_vfs_ioctl+0x16de/0x1f40 fs/ioctl.c:827
       __do_sys_ioctl fs/ioctl.c:872 [inline]
       __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

other info that might help us debug this:

Chain exists of:
  
&new->rf_sem --> &dquot->dq_lock --> &ocfs2_quota_ip_alloc_sem_key

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_quota_ip_alloc_sem_key);
                               lock(&dquot->dq_lock);
                               lock(
&ocfs2_quota_ip_alloc_sem_key);
  lock(&new->rf_sem);

 *** DEADLOCK ***

3 locks held by syz.7.1285/9036:
 #0: ffff88806827c460 (sb_writers#22
){.+.+}-{0:0}
, at: ioctl_file_clone fs/ioctl.c:242 [inline]
, at: ioctl_file_clone_range fs/ioctl.c:262 [inline]
, at: do_vfs_ioctl+0x16de/0x1f40 fs/ioctl.c:827
 #1: ffff88807b545108
 (&sb->s_type->i_mutex_key
#29){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#29){+.+.}-{3:3}, at: lock_two_nondirectories+0xf7/0x150 fs/inode.c:1147
 #2: ffff88807b544da0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_remap_file_range+0x3d4/0x740 fs/ocfs2/file.c:2696

stack backtrace:
CPU: 1 PID: 9036 Comm: syz.7.1285 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3120 [inline]
 check_prevs_add kernel/locking/lockdep.c:3239 [inline]
 validate_chain kernel/locking/lockdep.c:3855 [inline]
 __lock_acquire+0x38f7/0x7d40 kernel/locking/lockdep.c:5120
 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737
 down_write+0x38/0x60 kernel/locking/rwsem.c:1551
 __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:455 [inline]
 ocfs2_lock_refcount_tree+0x1aa/0x9d0 fs/ocfs2/refcounttree.c:490
 ocfs2_reflink_remap_extent fs/ocfs2/refcounttree.c:4605 [inline]
 ocfs2_reflink_remap_blocks+0xcec/0x1ab0 fs/ocfs2/refcounttree.c:4742
 ocfs2_remap_file_range+0x4a7/0x740 fs/ocfs2/file.c:2706
 do_clone_file_range+0x265/0x2d0 fs/remap_range.c:395
 vfs_clone_file_range+0x1ee/0x4f0 fs/remap_range.c:413
 ioctl_file_clone fs/ioctl.c:242 [inline]
 ioctl_file_clone_range fs/ioctl.c:262 [inline]
 do_vfs_ioctl+0x16de/0x1f40 fs/ioctl.c:827
 __do_sys_ioctl fs/ioctl.c:872 [inline]
 __se_sys_ioctl+0x83/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3f1ce97559
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:00007f3f1b0ee028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3f1d11dfa0 RCX: 00007f3f1ce97559
RDX: 00002000000000c0 RSI: 000000004020940d RDI: 0000000000000004
RBP: 00007f3f1cf2eb20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3f1d11e038 R14: 00007f3f1d11dfa0 R15: 00007ffda23e72d8
 </TASK>
kcov: kcov_task_exit: t = ffff88802b730000, kcov->t = ffff88802b730000