======================================================
WARNING: possible circular locking dependency detected
5.15.167-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.295/5830 is trying to acquire lock:
ffff0000e6772a58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2bc/0x1a44 fs/ext4/inode.c:597

but task is already holding lock:
ffff0000da1fa208 (&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:6192
       dqget+0x664/0xd0c fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515
       dquot_initialize fs/quota/dquot.c:1577 [inline]
       dquot_file_open+0x90/0xc8 fs/quota/dquot.c:2219
       ext4_file_open+0x200/0x540 fs/ext4/file.c:876
       do_dentry_open+0x780/0xed8 fs/open.c:826
       vfs_open+0x7c/0x90 fs/open.c:956
       do_open fs/namei.c:3608 [inline]
       path_openat+0x1ea0/0x26cc fs/namei.c:3742
       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:6172
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6232
       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:5742
       ext4_ext_map_blocks+0x1500/0x6418 fs/ext4/extents.c:4318
       ext4_map_blocks+0x8d0/0x1a44 fs/ext4/inode.c:672
       ext4_alloc_file_blocks+0x308/0xa84 fs/ext4/extents.c:4505
       ext4_fallocate+0xa88/0x1cb4 fs/ext4/extents.c:4792
       vfs_fallocate+0x478/0x5b4 fs/open.c:308
       ksys_fallocate fs/open.c:331 [inline]
       __do_sys_fallocate fs/open.c:339 [inline]
       __se_sys_fallocate fs/open.c:337 [inline]
       __arm64_sys_fallocate+0xc0/0x110 fs/open.c:337
       __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:6566
       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:6192
       dqget+0x664/0xd0c fs/quota/dquot.c:986
       dquot_transfer+0x24c/0x438 fs/quota/dquot.c:2155
       ext4_setattr+0x72c/0x1440 fs/ext4/inode.c:5419
       notify_change+0xa34/0xcf8 fs/attr.c:505
       chown_common+0x4ac/0x74c fs/open.c:680
       vfs_fchown fs/open.c:748 [inline]
       ksys_fchown+0xe0/0x158 fs/open.c:759
       __do_sys_fchown fs/open.c:767 [inline]
       __se_sys_fchown fs/open.c:765 [inline]
       __arm64_sys_fchown+0x7c/0x94 fs/open.c:765
       __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.0.295/5830:
 #0: ffff0000da1fa460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:421
 #1: ffff0000dbf149b8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline]
 #1: ffff0000dbf149b8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chown_common+0x3f8/0x74c fs/open.c:674
 #2: ffff0000dbf14690 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x720/0x1440 fs/ext4/inode.c:5418
 #3: ffff0000ddbd2b28 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5e4 fs/quota/dquot.c:460
 #4: ffff0000da1fa208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 1 PID: 5830 Comm: syz.0.295 Not tainted 5.15.167-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
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:6566
 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:6192
 dqget+0x664/0xd0c fs/quota/dquot.c:986
 dquot_transfer+0x24c/0x438 fs/quota/dquot.c:2155
 ext4_setattr+0x72c/0x1440 fs/ext4/inode.c:5419
 notify_change+0xa34/0xcf8 fs/attr.c:505
 chown_common+0x4ac/0x74c fs/open.c:680
 vfs_fchown fs/open.c:748 [inline]
 ksys_fchown+0xe0/0x158 fs/open.c:759
 __do_sys_fchown fs/open.c:767 [inline]
 __se_sys_fchown fs/open.c:765 [inline]
 __arm64_sys_fchown+0x7c/0x94 fs/open.c:765
 __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