EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
ext4 filesystem being mounted at /65/file0 supports timestamps until 2038 (0x7fffffff)
======================================================
WARNING: possible circular locking dependency detected
6.1.102-syzkaller #0 Not tainted
------------------------------------------------------
syz.4.905/8043 is trying to acquire lock:
ffff8880581852c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644

but task is already holding lock:
ffff8880725a2208 (&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+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       down_read+0xad/0xa30 kernel/locking/rwsem.c:1520
       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:6773
       dqget+0x74e/0xe30 fs/quota/dquot.c:986
       __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1516
       ext4_mkdir+0x197/0xce0 fs/ext4/namei.c:3010
       vfs_mkdir+0x3b6/0x590 fs/namei.c:4108
       do_mkdirat+0x225/0x360 fs/namei.c:4133
       __do_sys_mkdirat fs/namei.c:4148 [inline]
       __se_sys_mkdirat fs/namei.c:4146 [inline]
       __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4146
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&dquot->dq_lock){+.+.}-{3:3}:
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747
       dquot_commit+0x57/0x510 fs/quota/dquot.c:507
       ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6753
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
       __dquot_free_space+0x956/0xe70 fs/quota/dquot.c:1941
       dquot_free_space_nodirty include/linux/quotaops.h:379 [inline]
       dquot_free_space include/linux/quotaops.h:384 [inline]
       dquot_free_block include/linux/quotaops.h:395 [inline]
       ext4_mb_clear_bb fs/ext4/mballoc.c:6146 [inline]
       ext4_free_blocks+0x1fb8/0x3020 fs/ext4/mballoc.c:6276
       ext4_remove_blocks fs/ext4/extents.c:2521 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2687 [inline]
       ext4_ext_remove_space+0x22bb/0x4f30 fs/ext4/extents.c:2935
       ext4_ext_truncate+0x201/0x360 fs/ext4/extents.c:4446
       ext4_truncate+0xa1d/0x1290 fs/ext4/inode.c:4277
       ext4_evict_inode+0xb68/0x1150 fs/ext4/inode.c:286
       evict+0x2a4/0x620 fs/inode.c:666
       ext4_orphan_cleanup+0xb70/0x1400 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5533 [inline]
       ext4_fill_super+0x83ff/0x8b50 fs/ext4/super.c:5664
       get_tree_bdev+0x3fe/0x620 fs/super.c:1355
       vfs_get_tree+0x88/0x270 fs/super.c:1562
       do_new_mount+0x2ba/0xb40 fs/namespace.c:3051
       do_mount fs/namespace.c:3394 [inline]
       __do_sys_mount fs/namespace.c:3602 [inline]
       __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3579
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ei->i_data_sem/2){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
       lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
       down_write+0x36/0x60 kernel/locking/rwsem.c:1573
       ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644
       ext4_getblk+0x1eb/0x7c0 fs/ext4/inode.c:866
       ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
       ext4_quota_write+0x21e/0x570 fs/ext4/super.c:7147
       write_blk fs/quota/quota_tree.c:64 [inline]
       find_free_dqentry fs/quota/quota_tree.c:312 [inline]
       do_insert_tree+0xe16/0x1ae0 fs/quota/quota_tree.c:373
       do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
       do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
       do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
       dq_insert_tree fs/quota/quota_tree.c:401 [inline]
       qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:420
       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:6773
       dqget+0x74e/0xe30 fs/quota/dquot.c:986
       __dquot_initialize+0x45e/0xea0 fs/quota/dquot.c:1516
       ext4_create+0xb1/0x550 fs/ext4/namei.c:2827
       lookup_open fs/namei.c:3484 [inline]
       open_last_lookups fs/namei.c:3552 [inline]
       path_openat+0x12f1/0x2e60 fs/namei.c:3782
       do_filp_open+0x230/0x480 fs/namei.c:3812
       do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
       do_sys_open fs/open.c:1334 [inline]
       __do_sys_open fs/open.c:1342 [inline]
       __se_sys_open fs/open.c:1338 [inline]
       __x64_sys_open+0x221/0x270 fs/open.c:1338
       do_syscall_x64 arch/x86/entry/common.c:51 [inline]
       do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

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.4.905/8043:
 #0: ffff8880725a2460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
 #1: ffff888058180400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
 #1: ffff888058180400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: open_last_lookups fs/namei.c:3549 [inline]
 #1: ffff888058180400 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: path_openat+0x7b6/0x2e60 fs/namei.c:3782
 #2: ffff8880733cb3e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:460
 #3: ffff8880725a2208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 0 PID: 8043 Comm: syz.4.905 Not tainted 6.1.102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 check_noncircular+0x2fa/0x3b0 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain+0x1661/0x5950 kernel/locking/lockdep.c:3825
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5049
 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5662
 down_write+0x36/0x60 kernel/locking/rwsem.c:1573
 ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644
 ext4_getblk+0x1eb/0x7c0 fs/ext4/inode.c:866
 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
 ext4_quota_write+0x21e/0x570 fs/ext4/super.c:7147
 write_blk fs/quota/quota_tree.c:64 [inline]
 find_free_dqentry fs/quota/quota_tree.c:312 [inline]
 do_insert_tree+0xe16/0x1ae0 fs/quota/quota_tree.c:373
 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375
 dq_insert_tree fs/quota/quota_tree.c:401 [inline]
 qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:420
 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:6773
 dqget+0x74e/0xe30 fs/quota/dquot.c:986
 __dquot_initialize+0x45e/0xea0 fs/quota/dquot.c:1516
 ext4_create+0xb1/0x550 fs/ext4/namei.c:2827
 lookup_open fs/namei.c:3484 [inline]
 open_last_lookups fs/namei.c:3552 [inline]
 path_openat+0x12f1/0x2e60 fs/namei.c:3782
 do_filp_open+0x230/0x480 fs/namei.c:3812
 do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_open fs/open.c:1342 [inline]
 __se_sys_open fs/open.c:1338 [inline]
 __x64_sys_open+0x221/0x270 fs/open.c:1338
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fa0827773b9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa0834f5048 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fa082905f80 RCX: 00007fa0827773b9
RDX: 0000000000000000 RSI: 0000000000064842 RDI: 00000000200005c0
RBP: 00007fa0827e48e6 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa082905f80 R15: 00007fffcba608e8
 </TASK>