======================================================
WARNING: possible circular locking dependency detected
5.15.169-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor/4503 is trying to acquire lock:
ffff0000e5d02060 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597

but task is already holding lock:
ffff0000e9488208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 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}:
       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_create+0xb4/0x480 fs/ext4/namei.c:2876
       lookup_open fs/namei.c:3462 [inline]
       open_last_lookups fs/namei.c:3532 [inline]
       path_openat+0xf18/0x26cc fs/namei.c:3739
       do_filp_open+0x1a8/0x3b4 fs/namei.c:3769
       do_sys_openat2+0x128/0x3e0 fs/open.c:1253
       do_sys_open fs/open.c:1269 [inline]
       __do_sys_openat fs/open.c:1285 [inline]
       __se_sys_openat fs/open.c:1280 [inline]
       __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280
       __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 (&dquot->dq_lock){+.+.}-{3:3}:
       __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_free_space+0x878/0xce8 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:6156 [inline]
       ext4_free_blocks+0x1bf8/0x2bdc fs/ext4/mballoc.c:6286
       ext4_remove_blocks fs/ext4/extents.c:2523 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2689 [inline]
       ext4_ext_remove_space+0x1c48/0x4254 fs/ext4/extents.c:2937
       ext4_ext_truncate+0x188/0x250 fs/ext4/extents.c:4471
       ext4_truncate+0x9c4/0x1058 fs/ext4/inode.c:4249
       ext4_evict_inode+0xc30/0x124c fs/ext4/inode.c:289
       evict+0x418/0x894 fs/inode.c:622
       iput_final fs/inode.c:1744 [inline]
       iput+0x744/0x824 fs/inode.c:1770
       d_delete_notify include/linux/fsnotify.h:267 [inline]
       vfs_rmdir+0x2f8/0x3f0 fs/namei.c:4162
       do_rmdir+0x2e8/0x84c fs/namei.c:4210
       __do_sys_unlinkat fs/namei.c:4390 [inline]
       __se_sys_unlinkat fs/namei.c:4384 [inline]
       __arm64_sys_unlinkat+0xe0/0xfc fs/namei.c:4384
       __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 (&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 kernel/locking/lockdep.c:3788 [inline]
       __lock_acquire+0x32d4/0x7638 kernel/locking/lockdep.c:5012
       lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623
       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
       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_unlink+0x134/0x6a0 fs/ext4/namei.c:3363
       vfs_unlink+0x2f0/0x508 fs/namei.c:4280
       do_unlinkat+0x4cc/0x830 fs/namei.c:4348
       __do_sys_unlinkat fs/namei.c:4391 [inline]
       __se_sys_unlinkat fs/namei.c:4384 [inline]
       __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
       __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:
  &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/4503:
 #0: ffff0000e9488460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:377
 #1: ffff0000ddc5d3b0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:824 [inline]
 #1: ffff0000ddc5d3b0 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x2d0/0x830 fs/namei.c:4331
 #2: ffff0000ddcfe7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #2: ffff0000ddcfe7a0 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: vfs_unlink+0xd8/0x508 fs/namei.c:4269
 #3: ffff0000e5f5a5e8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5e4 fs/quota/dquot.c:460
 #4: ffff0000e9488208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 1 PID: 4503 Comm: syz-executor Not tainted 5.15.169-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
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
 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
 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_unlink+0x134/0x6a0 fs/ext4/namei.c:3363
 vfs_unlink+0x2f0/0x508 fs/namei.c:4280
 do_unlinkat+0x4cc/0x830 fs/namei.c:4348
 __do_sys_unlinkat fs/namei.c:4391 [inline]
 __se_sys_unlinkat fs/namei.c:4384 [inline]
 __arm64_sys_unlinkat+0xcc/0xfc fs/namei.c:4384
 __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