======================================================
WARNING: possible circular locking dependency detected
5.15.167-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor/5324 is trying to acquire lock:
ffff888071c5d238 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597

but task is already holding lock:
ffff88801c1e0208 (&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_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:4974
       mount_bdev+0x2c9/0x3f0 fs/super.c:1398
       legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1528
       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+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
       ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
       ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4974
       mount_bdev+0x2c9/0x3f0 fs/super.c:1398
       legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
       vfs_get_tree+0x88/0x270 fs/super.c:1528
       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+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
       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_unlink+0x12e/0x530 fs/ext4/namei.c:3361
       vfs_unlink+0x359/0x5f0 fs/namei.c:4280
       do_unlinkat+0x4a3/0x950 fs/namei.c:4348
       __do_sys_unlink fs/namei.c:4396 [inline]
       __se_sys_unlink fs/namei.c:4394 [inline]
       __x64_sys_unlink+0x45/0x50 fs/namei.c:4394
       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 ***

5 locks held by syz-executor/5324:
 #0: ffff88801c1e0460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
 #1: ffff88805b805da8 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff88805b805da8 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: do_unlinkat+0x266/0x950 fs/namei.c:4331
 #2: ffff88805b875da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #2: ffff88805b875da8 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xe0/0x5f0 fs/namei.c:4269
 #3: ffff8880608a0428 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:460
 #4: ffff88801c1e0208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 1 PID: 5324 Comm: syz-executor Not tainted 5.15.167-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
 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_unlink+0x12e/0x530 fs/ext4/namei.c:3361
 vfs_unlink+0x359/0x5f0 fs/namei.c:4280
 do_unlinkat+0x4a3/0x950 fs/namei.c:4348
 __do_sys_unlink fs/namei.c:4396 [inline]
 __se_sys_unlink fs/namei.c:4394 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4394
 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: 0033:0x7fd872d454a7
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 57 00 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:00007fff6d8c2728 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd872d454a7
RDX: 00007fff6d8c2750 RSI: 00007fff6d8c27e0 RDI: 00007fff6d8c27e0
RBP: 00007fff6d8c27e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007fff6d8c38d0
R13: 00007fd872db8a14 R14: 000000000006e3ac R15: 00007fff6d8c5a80
 </TASK>
Quota error (device loop0): do_check_range: Getting dqdh_next_free 4294967294 out of range 0-8
Quota error (device loop0): qtree_write_dquot: Error -117 occurred while creating quota
EXT4-fs error (device loop0): ext4_acquire_dquot:6196: comm syz-executor: Failed to acquire dquot type 0