======================================================
WARNING: possible circular locking dependency detected
5.15.151-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/23762 is trying to acquire lock:
ffff88803ca35238 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568

but task is already holding lock:
ffff88803733a208 (&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:1488
       v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332
       dquot_acquire+0x188/0x680 fs/quota/dquot.c:461
       ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180
       dqget+0x74e/0xe30 fs/quota/dquot.c:984
       __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562
       ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
       ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4966
       mount_bdev+0x2c9/0x3f0 fs/super.c:1387
       legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1517
       do_new_mount+0x2ba/0xb40 fs/namespace.c:3005
       do_mount fs/namespace.c:3348 [inline]
       __do_sys_mount fs/namespace.c:3556 [inline]
       __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x61/0xcb

-> #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:505
       ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6164
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:410 [inline]
       __dquot_alloc_space+0x53a/0xf30 fs/quota/dquot.c:1792
       dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline]
       dquot_alloc_space include/linux/quotaops.h:310 [inline]
       dquot_alloc_block include/linux/quotaops.h:334 [inline]
       ext4_mb_new_blocks+0x12bb/0x4d50 fs/ext4/mballoc.c:5670
       ext4_ext_map_blocks+0x1b0a/0x7690 fs/ext4/extents.c:4316
       ext4_map_blocks+0xaad/0x1e00 fs/ext4/inode.c:645
       ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846
       ext4_bread+0x2a/0x170 fs/ext4/inode.c:899
       ext4_append+0x31f/0x5c0 fs/ext4/namei.c:83
       ext4_init_new_dir+0x33a/0xa20 fs/ext4/namei.c:2981
       ext4_mkdir+0x4f2/0xce0 fs/ext4/namei.c:3027
       vfs_mkdir+0x419/0x640 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+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x61/0xcb

-> #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:1488
       ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568
       ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846
       ext4_bread+0x2a/0x170 fs/ext4/inode.c:899
       ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6546
       write_blk fs/quota/quota_tree.c:64 [inline]
       get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125
       find_free_dqentry fs/quota/quota_tree.c:271 [inline]
       do_insert_tree+0xa2c/0x1c20 fs/quota/quota_tree.c:364
       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:470
       ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180
       dqget+0x74e/0xe30 fs/quota/dquot.c:984
       __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1562
       __ext4_new_inode+0x890/0x4430 fs/ext4/ialloc.c:993
       ext4_create+0x275/0x550 fs/ext4/namei.c:2834
       lookup_open fs/namei.c:3462 [inline]
       open_last_lookups fs/namei.c:3532 [inline]
       path_openat+0x12f6/0x2f20 fs/namei.c:3739
       do_filp_open+0x21c/0x460 fs/namei.c:3769
       do_sys_openat2+0x13b/0x500 fs/open.c:1211
       do_sys_open fs/open.c:1227 [inline]
       __do_sys_creat fs/open.c:1301 [inline]
       __se_sys_creat fs/open.c:1295 [inline]
       __x64_sys_creat+0x11f/0x160 fs/open.c:1295
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x61/0xcb

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-executor.4/23762:
 #0: ffff88803733a460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
 #1: ffff88808ae53fc0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #1: ffff88808ae53fc0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: open_last_lookups fs/namei.c:3529 [inline]
 #1: ffff88808ae53fc0 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: path_openat+0x824/0x2f20 fs/namei.c:3739
 #2: ffff88803ca705e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:458
 #3: ffff88803733a208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 0 PID: 23762 Comm: syz-executor.4 Not tainted 5.15.151-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb 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:1488
 ext4_map_blocks+0x3a6/0x1e00 fs/ext4/inode.c:568
 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:846
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:899
 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6546
 write_blk fs/quota/quota_tree.c:64 [inline]
 get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125
 find_free_dqentry fs/quota/quota_tree.c:271 [inline]
 do_insert_tree+0xa2c/0x1c20 fs/quota/quota_tree.c:364
 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:470
 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6180
 dqget+0x74e/0xe30 fs/quota/dquot.c:984
 __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1562
 __ext4_new_inode+0x890/0x4430 fs/ext4/ialloc.c:993
 ext4_create+0x275/0x550 fs/ext4/namei.c:2834
 lookup_open fs/namei.c:3462 [inline]
 open_last_lookups fs/namei.c:3532 [inline]
 path_openat+0x12f6/0x2f20 fs/namei.c:3739
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13b/0x500 fs/open.c:1211
 do_sys_open fs/open.c:1227 [inline]
 __do_sys_creat fs/open.c:1301 [inline]
 __se_sys_creat fs/open.c:1295 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1295
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9335712da9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9333c930c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f9335840f80 RCX: 00007f9335712da9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 00007f933575f47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f9335840f80 R15: 00007ffe360e42a8
 </TASK>