======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.552/5856 is trying to acquire lock:
ffff888056775f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline]
ffff888056775f48 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: ocfs2_remove_btree_range+0x64f/0x15e0 fs/ocfs2/alloc.c:5742

but task is already holding lock:
ffff8880567eea20 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x365/0x1660 fs/ocfs2/file.c:467

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}:
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ocfs2_create_local_dquot+0x19a/0x1900 fs/ocfs2/quota_local.c:1224
       ocfs2_acquire_dquot+0x7e6/0xb80 fs/ocfs2/quota_global.c:871
       dqget+0x713/0xbb0 fs/quota/dquot.c:1013
       __dquot_initialize+0x3a9/0xd00 fs/quota/dquot.c:1542
       ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202
       ocfs2_mknod+0xbdc/0x2500 fs/ocfs2/namei.c:311
       ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:676
       lookup_open fs/namei.c:3533 [inline]
       open_last_lookups fs/namei.c:3601 [inline]
       path_openat+0x11b9/0x2f10 fs/namei.c:3831
       do_filp_open+0x1ee/0x420 fs/namei.c:3861
       do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_openat fs/open.c:1352 [inline]
       __se_sys_openat fs/open.c:1347 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1347
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #3 (&dquot->dq_lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12d/0xae0 kernel/locking/mutex.c:747
       dquot_commit+0x5a/0x410 fs/quota/dquot.c:535
       ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6817
       mark_dquot_dirty fs/quota/dquot.c:400 [inline]
       mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:440
       __dquot_alloc_space+0x5f6/0xe50 fs/quota/dquot.c:1777
       dquot_alloc_space_nodirty include/linux/quotaops.h:293 [inline]
       dquot_alloc_space include/linux/quotaops.h:306 [inline]
       dquot_alloc_block include/linux/quotaops.h:330 [inline]
       ext4_mb_new_blocks+0xf55/0x44d0 fs/ext4/mballoc.c:5740
       ext4_ext_map_blocks+0x18d1/0x6640 fs/ext4/extents.c:4361
       ext4_map_blocks+0x9d7/0x1a90 fs/ext4/inode.c:681
       ext4_getblk+0x1c5/0x720 fs/ext4/inode.c:892
       ext4_bread+0x26/0x170 fs/ext4/inode.c:948
       ext4_append+0x2bb/0x560 fs/ext4/namei.c:83
       ext4_init_new_dir+0x2b8/0x550 fs/ext4/namei.c:3032
       ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3078
       vfs_mkdir+0x386/0x570 fs/namei.c:4157
       do_mkdirat+0x1d8/0x440 fs/namei.c:4182
       __do_sys_mkdirat fs/namei.c:4197 [inline]
       __se_sys_mkdirat fs/namei.c:4195 [inline]
       __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4195
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #2 (&ei->i_data_sem){++++}-{3:3}:
       down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x338/0x1a90 fs/ext4/inode.c:606
       ext4_append+0x22d/0x560 fs/ext4/namei.c:75
       ext4_init_new_dir+0x2b8/0x550 fs/ext4/namei.c:3032
       ext4_mkdir+0x4c3/0xc90 fs/ext4/namei.c:3078
       vfs_mkdir+0x386/0x570 fs/namei.c:4157
       do_mkdirat+0x1d8/0x440 fs/namei.c:4182
       __do_sys_mkdir fs/namei.c:4202 [inline]
       __se_sys_mkdir fs/namei.c:4200 [inline]
       __x64_sys_mkdir+0x6a/0x80 fs/namei.c:4200
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (jbd2_handle){++++}-{0:0}:
       jbd2_journal_lock_updates+0xa8/0x390 fs/jbd2/transaction.c:880
       __ocfs2_flush_truncate_log+0x2cf/0x1220 fs/ocfs2/alloc.c:6029
       ocfs2_flush_truncate_log+0x4b/0x60 fs/ocfs2/alloc.c:6076
       ocfs2_sync_fs+0x119/0x330 fs/ocfs2/super.c:402
       sync_filesystem+0x1be/0x220 fs/sync.c:66
       generic_shutdown_super+0x6b/0x340 fs/super.c:474
       kill_block_super+0x7c/0xe0 fs/super.c:1481
       deactivate_locked_super+0x93/0xf0 fs/super.c:332
       cleanup_mnt+0x471/0x4f0 fs/namespace.c:1191
       task_work_run+0x1d0/0x260 kernel/task_work.c:203
       resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
       exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:180
       exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:213
       __syscall_exit_to_user_mode_work kernel/entry/common.c:295 [inline]
       syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:306
       do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3162 [inline]
       check_prevs_add kernel/locking/lockdep.c:3281 [inline]
       validate_chain kernel/locking/lockdep.c:3897 [inline]
       __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171
       lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:764 [inline]
       ocfs2_remove_btree_range+0x64f/0x15e0 fs/ocfs2/alloc.c:5742
       ocfs2_commit_truncate+0xba2/0x1e00 fs/ocfs2/alloc.c:7353
       ocfs2_truncate_file+0xdf0/0x1660 fs/ocfs2/file.c:505
       ocfs2_setattr+0x16f8/0x1d90 fs/ocfs2/file.c:1212
       notify_change+0xca0/0xf90 fs/attr.c:499
       do_truncate+0x1ac/0x240 fs/open.c:65
       handle_truncate fs/namei.c:3336 [inline]
       do_open fs/namei.c:3681 [inline]
       path_openat+0x2897/0x2f10 fs/namei.c:3834
       do_filp_open+0x1ee/0x420 fs/namei.c:3861
       do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
       do_sys_open fs/open.c:1336 [inline]
       __do_sys_openat fs/open.c:1352 [inline]
       __se_sys_openat fs/open.c:1347 [inline]
       __x64_sys_openat+0x135/0x160 fs/open.c:1347
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6 --> &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(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6);

 *** DEADLOCK ***

3 locks held by syz.0.552/5856:
 #0: ffff888077302460 (sb_writers#22){.+.+}-{0:0}, at: mnt_want_write+0x3d/0x90 fs/namespace.c:402
 #1: ffff8880567eed88 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:764 [inline]
 #1: ffff8880567eed88 (&sb->s_type->i_mutex_key#28){+.+.}-{3:3}, at: do_truncate+0x198/0x240 fs/open.c:63
 #2: ffff8880567eea20 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_truncate_file+0x365/0x1660 fs/ocfs2/file.c:467

stack backtrace:
CPU: 0 PID: 5856 Comm: syz.0.552 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 check_noncircular+0x2f8/0x400 kernel/locking/lockdep.c:2215
 check_prev_add kernel/locking/lockdep.c:3162 [inline]
 check_prevs_add kernel/locking/lockdep.c:3281 [inline]
 validate_chain kernel/locking/lockdep.c:3897 [inline]
 __lock_acquire+0x3a03/0x7ea0 kernel/locking/lockdep.c:5171
 lock_acquire+0x1bc/0x4a0 kernel/locking/lockdep.c:5790
 down_write+0x36/0x60 kernel/locking/rwsem.c:1573
 inode_lock include/linux/fs.h:764 [inline]
 ocfs2_remove_btree_range+0x64f/0x15e0 fs/ocfs2/alloc.c:5742
 ocfs2_commit_truncate+0xba2/0x1e00 fs/ocfs2/alloc.c:7353
 ocfs2_truncate_file+0xdf0/0x1660 fs/ocfs2/file.c:505
 ocfs2_setattr+0x16f8/0x1d90 fs/ocfs2/file.c:1212
 notify_change+0xca0/0xf90 fs/attr.c:499
 do_truncate+0x1ac/0x240 fs/open.c:65
 handle_truncate fs/namei.c:3336 [inline]
 do_open fs/namei.c:3681 [inline]
 path_openat+0x2897/0x2f10 fs/namei.c:3834
 do_filp_open+0x1ee/0x420 fs/namei.c:3861
 do_sys_openat2+0x14b/0x4f0 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __x64_sys_openat+0x135/0x160 fs/open.c:1347
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f917039e2d9
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:00007f91711af028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f9170626090 RCX: 00007f917039e2d9
RDX: 000000000000275a RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007f9170435888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9170626128 R14: 00007f9170626090 R15: 00007ffd1aeb1198
 </TASK>