======================================================
WARNING: possible circular locking dependency detected
5.15.173-syzkaller #0 Not tainted
------------------------------------------------------
syz.8.801/7845 is trying to acquire lock:
ffff0000e941c428 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:507

but task is already holding lock:
ffff0000d214c840 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x830/0x1a44 fs/ext4/inode.c:665

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ei->i_data_sem/2){++++}-{3:3}:
       down_read+0xc0/0x398 kernel/locking/rwsem.c:1498
       ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597
       ext4_getblk+0x160/0x688 fs/ext4/inode.c:869
       ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922
       ext4_quota_write+0x238/0x564 fs/ext4/super.c:6567
       write_blk fs/quota/quota_tree.c:64 [inline]
       get_free_dqblk+0x2dc/0x6a0 fs/quota/quota_tree.c:125
       do_insert_tree+0x238/0x14cc fs/quota/quota_tree.c:335
       do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366
       do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366
       do_insert_tree+0x4b8/0x14cc fs/quota/quota_tree.c:366
       dq_insert_tree fs/quota/quota_tree.c:392 [inline]
       qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:411
       v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
       dquot_acquire+0x2cc/0x5e4 fs/quota/dquot.c:472
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6193
       dqget+0x664/0xd0c fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577
       ext4_setattr+0x228/0x1440 fs/ext4/inode.c:5399
       notify_change+0xa34/0xcf8 fs/attr.c:505
       do_truncate+0x1c0/0x28c fs/open.c:65
       vfs_truncate+0x2e0/0x388 fs/open.c:111
       do_sys_truncate+0xec/0x1b4 fs/open.c:134
       __do_sys_truncate fs/open.c:146 [inline]
       __se_sys_truncate fs/open.c:144 [inline]
       __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0xc0/0x398 kernel/locking/rwsem.c:1498
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332
       dquot_acquire+0x130/0x5e4 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6193
       dqget+0x664/0xd0c fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577
       ext4_setattr+0x228/0x1440 fs/ext4/inode.c:5399
       notify_change+0xa34/0xcf8 fs/attr.c:505
       do_truncate+0x1c0/0x28c fs/open.c:65
       vfs_truncate+0x2e0/0x388 fs/open.c:111
       do_sys_truncate+0xec/0x1b4 fs/open.c:134
       __do_sys_truncate fs/open.c:146 [inline]
       __se_sys_truncate fs/open.c:144 [inline]
       __arm64_sys_truncate+0x5c/0x70 fs/open.c:144
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3053 [inline]
       check_prevs_add kernel/locking/lockdep.c:3172 [inline]
       validate_chain kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
       lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
       __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
       __mutex_lock kernel/locking/mutex.c:729 [inline]
       mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
       dquot_commit+0x54/0x240 fs/quota/dquot.c:507
       ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6173
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6233
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
       __dquot_alloc_space+0xb54/0xf7c fs/quota/dquot.c:1750
       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+0xe78/0x4278 fs/ext4/mballoc.c:5739
       ext4_ext_map_blocks+0x1500/0x6418 fs/ext4/extents.c:4339
       ext4_map_blocks+0x8d0/0x1a44 fs/ext4/inode.c:672
       ext4_getblk+0x160/0x688 fs/ext4/inode.c:869
       ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922
       ext4_append+0x260/0x4cc fs/ext4/namei.c:83
       ext4_init_new_dir+0x294/0x8f4 fs/ext4/namei.c:3030
       ext4_mkdir+0x3d4/0xa74 fs/ext4/namei.c:3076
       vfs_mkdir+0x334/0x4e4 fs/namei.c:4065
       do_mkdirat+0x20c/0x610 fs/namei.c:4090
       __do_sys_mkdirat fs/namei.c:4105 [inline]
       __se_sys_mkdirat fs/namei.c:4103 [inline]
       __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
       el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
       el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

other info that might help us debug this:

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

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

4 locks held by syz.8.801/7845:
 #0: ffff0000e8178460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000d214d3b0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff0000d214d3b0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3835
 #2: ffff0000d214c840 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x830/0x1a44 fs/ext4/inode.c:665
 #3: ffff800014da9b38 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:311

stack backtrace:
CPU: 0 PID: 7845 Comm: syz.8.801 Not tainted 5.15.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2011
 check_noncircular+0x2cc/0x378 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 kernel/locking/lockdep.c:3788 [inline]
 __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
 __mutex_lock_common+0x194/0x2154 kernel/locking/mutex.c:596
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0xa4/0xf8 kernel/locking/mutex.c:743
 dquot_commit+0x54/0x240 fs/quota/dquot.c:507
 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6173
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6233
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
 __dquot_alloc_space+0xb54/0xf7c fs/quota/dquot.c:1750
 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+0xe78/0x4278 fs/ext4/mballoc.c:5739
 ext4_ext_map_blocks+0x1500/0x6418 fs/ext4/extents.c:4339
 ext4_map_blocks+0x8d0/0x1a44 fs/ext4/inode.c:672
 ext4_getblk+0x160/0x688 fs/ext4/inode.c:869
 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:922
 ext4_append+0x260/0x4cc fs/ext4/namei.c:83
 ext4_init_new_dir+0x294/0x8f4 fs/ext4/namei.c:3030
 ext4_mkdir+0x3d4/0xa74 fs/ext4/namei.c:3076
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4065
 do_mkdirat+0x20c/0x610 fs/namei.c:4090
 __do_sys_mkdirat fs/namei.c:4105 [inline]
 __se_sys_mkdirat fs/namei.c:4103 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4103
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584