======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted
------------------------------------------------------
syz-executor.5/6976 is trying to acquire lock:
ffff000135404428 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:479

but task is already holding lock:
ffff0000dff4a0a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x7c0/0x104c fs/ext4/inode.c:4337

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+0x50/0x6c kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x2ac/0x1884 fs/ext4/inode.c:574
       ext4_getblk+0x198/0x6ec fs/ext4/inode.c:863
       ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:919
       ext4_quota_read+0x178/0x294 fs/ext4/super.c:7089
       read_blk fs/quota/quota_tree.c:55 [inline]
       find_tree_dqentry+0x164/0xa08 fs/quota/quota_tree.c:624
       find_tree_dqentry+0x394/0xa08 fs/quota/quota_tree.c:640
       find_tree_dqentry+0x394/0xa08 fs/quota/quota_tree.c:640
       find_tree_dqentry+0x394/0xa08 fs/quota/quota_tree.c:640
       find_dqentry fs/quota/quota_tree.c:652 [inline]
       qtree_read_dquot+0x12c/0x634 fs/quota/quota_tree.c:672
       v2_read_dquot+0xc0/0x11c fs/quota/quota_v2.c:333
       dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:435
       ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770
       dqget+0x844/0xc48 fs/quota/dquot.c:914
       __dquot_initialize+0x2cc/0xb54 fs/quota/dquot.c:1492
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550
       ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x968/0x1140 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5509 [inline]
       ext4_fill_super+0x644c/0x6a30 fs/ext4/super.c:5637
       get_tree_bdev+0x360/0x54c fs/super.c:1303
       ext4_get_tree+0x28/0x38 fs/ext4/super.c:5668
       vfs_get_tree+0x90/0x274 fs/super.c:1510
       do_new_mount+0x25c/0x8c8 fs/namespace.c:3042
       path_mount+0x590/0xe04 fs/namespace.c:3372
       do_mount fs/namespace.c:3385 [inline]
       __do_sys_mount fs/namespace.c:3594 [inline]
       __se_sys_mount fs/namespace.c:3571 [inline]
       __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
       el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x50/0x6c kernel/locking/rwsem.c:1520
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:332
       dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:435
       ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770
       dqget+0x844/0xc48 fs/quota/dquot.c:914
       __dquot_initialize+0x2cc/0xb54 fs/quota/dquot.c:1492
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550
       ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x968/0x1140 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5509 [inline]
       ext4_fill_super+0x644c/0x6a30 fs/ext4/super.c:5637
       get_tree_bdev+0x360/0x54c fs/super.c:1303
       ext4_get_tree+0x28/0x38 fs/ext4/super.c:5668
       vfs_get_tree+0x90/0x274 fs/super.c:1510
       do_new_mount+0x25c/0x8c8 fs/namespace.c:3042
       path_mount+0x590/0xe04 fs/namespace.c:3372
       do_mount fs/namespace.c:3385 [inline]
       __do_sys_mount fs/namespace.c:3594 [inline]
       __se_sys_mount fs/namespace.c:3571 [inline]
       __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
       el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain kernel/locking/lockdep.c:3832 [inline]
       __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056
       lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
       dquot_commit+0x54/0x240 fs/quota/dquot.c:479
       ext4_write_dquot+0x1b4/0x288 fs/ext4/super.c:6754
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6802
       mark_dquot_dirty fs/quota/dquot.c:346 [inline]
       mark_all_dquot_dirty fs/quota/dquot.c:384 [inline]
       __dquot_free_space+0x7cc/0xd68 fs/quota/dquot.c:1907
       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:6044 [inline]
       ext4_free_blocks+0x1a14/0x2904 fs/ext4/mballoc.c:6173
       ext4_remove_blocks fs/ext4/extents.c:2545 [inline]
       ext4_ext_rm_leaf fs/ext4/extents.c:2710 [inline]
       ext4_ext_remove_space+0x1cc0/0x42a8 fs/ext4/extents.c:2958
       ext4_ext_truncate+0x168/0x210 fs/ext4/extents.c:4416
       ext4_truncate+0x9c4/0x104c fs/ext4/inode.c:4342
       ext4_evict_inode+0xc24/0x1254 fs/ext4/inode.c:286
       evict+0x260/0x68c fs/inode.c:665
       iput_final fs/inode.c:1748 [inline]
       iput+0x734/0x818 fs/inode.c:1774
       ext4_process_orphan+0x244/0x2b8 fs/ext4/orphan.c:360
       ext4_orphan_cleanup+0x968/0x1140 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5509 [inline]
       ext4_fill_super+0x644c/0x6a30 fs/ext4/super.c:5637
       get_tree_bdev+0x360/0x54c fs/super.c:1303
       ext4_get_tree+0x28/0x38 fs/ext4/super.c:5668
       vfs_get_tree+0x90/0x274 fs/super.c:1510
       do_new_mount+0x25c/0x8c8 fs/namespace.c:3042
       path_mount+0x590/0xe04 fs/namespace.c:3372
       do_mount fs/namespace.c:3385 [inline]
       __do_sys_mount fs/namespace.c:3594 [inline]
       __se_sys_mount fs/namespace.c:3571 [inline]
       __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
       do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
       el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591

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-executor.5/6976:
 #0: ffff0000f364a0e0 (&type->s_umount_key#25/1){+.+.}-{3:3}, at: alloc_super+0x1b4/0x824 fs/super.c:228
 #1: ffff0000f364a650 (sb_internal){.+.+}-{0:0}, at: __sb_start_write include/linux/fs.h:1477 [inline]
 #1: ffff0000f364a650 (sb_internal){.+.+}-{0:0}, at: sb_start_intwrite include/linux/fs.h:1599 [inline]
 #1: ffff0000f364a650 (sb_internal){.+.+}-{0:0}, at: ext4_evict_inode+0x3e4/0x1254 fs/ext4/inode.c:240
 #2: ffff0000dff4a0a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0x7c0/0x104c fs/ext4/inode.c:4337
 #3: ffff800015f7f5a8 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:326

stack backtrace:
CPU: 1 PID: 6976 Comm: syz-executor.5 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233
 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106
 dump_stack+0x1c/0x28 lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2056
 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain kernel/locking/lockdep.c:3832 [inline]
 __lock_acquire+0x3338/0x764c kernel/locking/lockdep.c:5056
 lock_acquire+0x238/0x718 kernel/locking/lockdep.c:5669
 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:799
 dquot_commit+0x54/0x240 fs/quota/dquot.c:479
 ext4_write_dquot+0x1b4/0x288 fs/ext4/super.c:6754
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6802
 mark_dquot_dirty fs/quota/dquot.c:346 [inline]
 mark_all_dquot_dirty fs/quota/dquot.c:384 [inline]
 __dquot_free_space+0x7cc/0xd68 fs/quota/dquot.c:1907
 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:6044 [inline]
 ext4_free_blocks+0x1a14/0x2904 fs/ext4/mballoc.c:6173
 ext4_remove_blocks fs/ext4/extents.c:2545 [inline]
 ext4_ext_rm_leaf fs/ext4/extents.c:2710 [inline]
 ext4_ext_remove_space+0x1cc0/0x42a8 fs/ext4/extents.c:2958
 ext4_ext_truncate+0x168/0x210 fs/ext4/extents.c:4416
 ext4_truncate+0x9c4/0x104c fs/ext4/inode.c:4342
 ext4_evict_inode+0xc24/0x1254 fs/ext4/inode.c:286
 evict+0x260/0x68c fs/inode.c:665
 iput_final fs/inode.c:1748 [inline]
 iput+0x734/0x818 fs/inode.c:1774
 ext4_process_orphan+0x244/0x2b8 fs/ext4/orphan.c:360
 ext4_orphan_cleanup+0x968/0x1140 fs/ext4/orphan.c:474
 __ext4_fill_super fs/ext4/super.c:5509 [inline]
 ext4_fill_super+0x644c/0x6a30 fs/ext4/super.c:5637
 get_tree_bdev+0x360/0x54c fs/super.c:1303
 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5668
 vfs_get_tree+0x90/0x274 fs/super.c:1510
 do_new_mount+0x25c/0x8c8 fs/namespace.c:3042
 path_mount+0x590/0xe04 fs/namespace.c:3372
 do_mount fs/namespace.c:3385 [inline]
 __do_sys_mount fs/namespace.c:3594 [inline]
 __se_sys_mount fs/namespace.c:3571 [inline]
 __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3571
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x64/0x198 arch/arm64/kernel/syscall.c:193
 el0_svc+0x4c/0x15c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:591
Quota error (device loop5): do_check_range: Getting dqdh_entries 15 out of range 0-14
EXT4-fs (loop5): 1 orphan inode deleted
EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback.