======================================================
WARNING: possible circular locking dependency detected
5.15.133-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.2/22702 is trying to acquire lock:
ffff000120425c30 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x2b4/0x19ac fs/ext4/inode.c:568

but task is already holding lock:
ffff0000c226c208 (&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:1488
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332
       dquot_acquire+0x130/0x5e4 fs/quota/dquot.c:459
       ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6180
       dqget+0x664/0xcac fs/quota/dquot.c:972
       dquot_set_dqblk+0x40/0xfec fs/quota/dquot.c:2823
       quota_setquota+0x5f4/0x728 fs/quota/quota.c:309
       do_quotactl+0x508/0x698 fs/quota/quota.c:801
       __do_sys_quotactl fs/quota/quota.c:959 [inline]
       __se_sys_quotactl fs/quota/quota.c:915 [inline]
       __arm64_sys_quotactl+0x2d8/0x7a4 fs/quota/quota.c:915
       __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:596
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
       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:503
       ext4_write_dquot+0x1b0/0x284 fs/ext4/super.c:6164
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6212
       mark_dquot_dirty fs/quota/dquot.c:370 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:408 [inline]
       __dquot_alloc_space+0x47c/0xd34 fs/quota/dquot.c:1780
       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+0xf34/0x4318 fs/ext4/mballoc.c:5646
       ext4_ext_map_blocks+0x1368/0x5ff4 fs/ext4/extents.c:4287
       ext4_map_blocks+0x8c4/0x19ac fs/ext4/inode.c:645
       _ext4_get_block+0x1c0/0x5c0 fs/ext4/inode.c:792
       ext4_get_block+0x4c/0x60 fs/ext4/inode.c:809
       ext4_block_write_begin+0x520/0x1130 fs/ext4/inode.c:1077
       ext4_write_begin+0x5e4/0xe84
       generic_perform_write+0x24c/0x520 mm/filemap.c:3776
       ext4_buffered_write_iter+0x3fc/0x528 fs/ext4/file.c:268
       ext4_file_write_iter+0x688/0x162c
       do_iter_readv_writev+0x420/0x5f8
       do_iter_write+0x1b8/0x664 fs/read_write.c:855
       vfs_writev fs/read_write.c:928 [inline]
       do_pwritev+0x1ec/0x334 fs/read_write.c:1025
       __do_sys_pwritev2 fs/read_write.c:1084 [inline]
       __se_sys_pwritev2 fs/read_write.c:1075 [inline]
       __arm64_sys_pwritev2+0xd4/0x108 fs/read_write.c:1075
       __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:596
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
       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:3787 [inline]
       __lock_acquire+0x32cc/0x7620 kernel/locking/lockdep.c:5011
       lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
       down_read+0xc0/0x398 kernel/locking/rwsem.c:1488
       ext4_map_blocks+0x2b4/0x19ac fs/ext4/inode.c:568
       ext4_getblk+0x160/0x688 fs/ext4/inode.c:846
       ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:899
       ext4_quota_write+0x238/0x564 fs/ext4/super.c:6546
       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:468
       ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6180
       dqget+0x664/0xcac fs/quota/dquot.c:972
       dquot_transfer+0x24c/0x438 fs/quota/dquot.c:2168
       ext4_setattr+0x72c/0x1440 fs/ext4/inode.c:5405
       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:596
       el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
       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.2/22702:
 #0: ffff0000c226c460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:421
 #1: ffff0001205a5da8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
 #1: ffff0001205a5da8 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chown_common+0x3f8/0x74c fs/open.c:674
 #2: ffff0001205a5a80 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x720/0x1440 fs/ext4/inode.c:5404
 #3: ffff0001205b9e68 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x5e4 fs/quota/dquot.c:456
 #4: ffff0000c226c208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x11c/0x188 fs/quota/quota_v2.c:354

stack backtrace:
CPU: 0 PID: 22702 Comm: syz-executor.2 Not tainted 5.15.133-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
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:3787 [inline]
 __lock_acquire+0x32cc/0x7620 kernel/locking/lockdep.c:5011
 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5622
 down_read+0xc0/0x398 kernel/locking/rwsem.c:1488
 ext4_map_blocks+0x2b4/0x19ac fs/ext4/inode.c:568
 ext4_getblk+0x160/0x688 fs/ext4/inode.c:846
 ext4_bread+0x3c/0x1d4 fs/ext4/inode.c:899
 ext4_quota_write+0x238/0x564 fs/ext4/super.c:6546
 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:468
 ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6180
 dqget+0x664/0xcac fs/quota/dquot.c:972
 dquot_transfer+0x24c/0x438 fs/quota/dquot.c:2168
 ext4_setattr+0x72c/0x1440 fs/ext4/inode.c:5405
 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:596
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:614
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584