EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.
ext4 filesystem being mounted at /29/file0 supports timestamps until 2038 (0x7fffffff)
======================================================
WARNING: possible circular locking dependency detected
5.15.166-syzkaller #0 Not tainted
------------------------------------------------------
syz.3.685/6096 is trying to acquire lock:
ffff88805f110278 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597

but task is already holding lock:
ffff888077964208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
       v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332
       dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192
       dqget+0x762/0xe90 fs/quota/dquot.c:986
       __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515
       ext4_create+0xb1/0x550 fs/ext4/namei.c:2874
       lookup_open fs/namei.c:3462 [inline]
       open_last_lookups fs/namei.c:3532 [inline]
       path_openat+0x130a/0x2f20 fs/namei.c:3739
       do_filp_open+0x21c/0x460 fs/namei.c:3769
       do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
       do_sys_open fs/open.c:1269 [inline]
       __do_sys_open fs/open.c:1277 [inline]
       __se_sys_open fs/open.c:1273 [inline]
       __x64_sys_open+0x221/0x270 fs/open.c:1273
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #1 (&dquot->dq_lock){+.+.}-{3:3}:
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       __mutex_lock_common+0x1da/0x25a0 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+0x57/0x510 fs/quota/dquot.c:507
       ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6172
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
       __dquot_free_space+0x932/0xe40 fs/quota/dquot.c:1940
       dquot_free_space_nodirty include/linux/quotaops.h:376 [inline]
       dquot_free_space include/linux/quotaops.h:381 [inline]
       dquot_free_block include/linux/quotaops.h:392 [inline]
       ext4_mb_clear_bb fs/ext4/mballoc.c:6158 [inline]
       ext4_free_blocks+0x1f6e/0x2ea0 fs/ext4/mballoc.c:6288
       ext4_remove_blocks fs/ext4/extents.c:2519 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2685 [inline]
       ext4_ext_remove_space+0x24da/0x4db0 fs/ext4/extents.c:2933
       ext4_ext_truncate+0x191/0x250 fs/ext4/extents.c:4450
       ext4_truncate+0x9fd/0x1130 fs/ext4/inode.c:4249
       ext4_evict_inode+0xba1/0x1100 fs/ext4/inode.c:289
       evict+0x529/0x930 fs/inode.c:622
       d_delete_notify include/linux/fsnotify.h:267 [inline]
       vfs_rmdir+0x33c/0x460 fs/namei.c:4162
       do_rmdir+0x368/0x670 fs/namei.c:4210
       __do_sys_unlinkat fs/namei.c:4390 [inline]
       __se_sys_unlinkat fs/namei.c:4384 [inline]
       __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4384
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

-> #0 (&ei->i_data_sem/2){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
       __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
       lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
       down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
       ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597
       ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
       ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
       ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6566
       write_blk fs/quota/quota_tree.c:64 [inline]
       get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125
       do_insert_tree+0x2b4/0x1c20 fs/quota/quota_tree.c:335
       do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
       do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
       do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
       dq_insert_tree fs/quota/quota_tree.c:392 [inline]
       qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411
       v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358
       dquot_acquire+0x34d/0x680 fs/quota/dquot.c:472
       ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192
       dqget+0x762/0xe90 fs/quota/dquot.c:986
       __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515
       ext4_mkdir+0x197/0xce0 fs/ext4/namei.c:3057
       vfs_mkdir+0x3b6/0x590 fs/namei.c:4065
       do_mkdirat+0x260/0x520 fs/namei.c:4090
       __do_sys_mkdirat fs/namei.c:4105 [inline]
       __se_sys_mkdirat fs/namei.c:4103 [inline]
       __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x66/0xd0

other info that might help us debug this:

Chain exists of:
  &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&s->s_dquot.dqio_sem);
                               lock(&dquot->dq_lock);
                               lock(&s->s_dquot.dqio_sem);
  lock(&ei->i_data_sem/2);

 *** DEADLOCK ***

4 locks held by syz.3.685/6096:
 #0: ffff888077964460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
 #1: ffff88805f113fc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff88805f113fc0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x25c/0x530 fs/namei.c:3835
 #2: ffff888062788268 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:460
 #3: ffff888077964208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 1 PID: 6096 Comm: syz.3.685 Not tainted 5.15.166-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
 check_prev_add kernel/locking/lockdep.c:3053 [inline]
 check_prevs_add kernel/locking/lockdep.c:3172 [inline]
 validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
 ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597
 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6566
 write_blk fs/quota/quota_tree.c:64 [inline]
 get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125
 do_insert_tree+0x2b4/0x1c20 fs/quota/quota_tree.c:335
 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366
 dq_insert_tree fs/quota/quota_tree.c:392 [inline]
 qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411
 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358
 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:472
 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192
 dqget+0x762/0xe90 fs/quota/dquot.c:986
 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515
 ext4_mkdir+0x197/0xce0 fs/ext4/namei.c:3057
 vfs_mkdir+0x3b6/0x590 fs/namei.c:4065
 do_mkdirat+0x260/0x520 fs/namei.c:4090
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4103
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fea54354797
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fea527cee68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fea527ceef0 RCX: 00007fea54354797
RDX: 00000000000001ff RSI: 0000000020000040 RDI: 00000000ffffff9c
RBP: 0000000020000140 R08: 00000000200000c0 R09: 0000000000000000
R10: 0000000020000140 R11: 0000000000000246 R12: 0000000020000040
R13: 00007fea527ceeb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
EXT4-fs error (device loop3): ext4_add_entry:2484: inode #2: comm syz.3.685: Directory hole found for htree leaf block 0
EXT4-fs (loop3): re-mounted. Opts: (null). Quota mode: writeback.