EXT4-fs (loop5): mounted filesystem without journal. Quota mode: writeback.
ext4 filesystem being mounted at /115/file0 supports timestamps until 2038-01-19 (0x7fffffff)
======================================================
WARNING: possible circular locking dependency detected
6.1.118-syzkaller #0 Not tainted
------------------------------------------------------
syz.5.1326/8474 is trying to acquire lock:
ffff0000f5825228 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:507

but task is already holding lock:
ffff0000def65cd0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671

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+0x64/0x308 kernel/locking/rwsem.c:1520
       ext4_map_blocks+0x2ac/0x1810 fs/ext4/inode.c:603
       ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889
       ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945
       ext4_quota_read+0x178/0x294 fs/ext4/super.c:7125
       read_blk fs/quota/quota_tree.c:61 [inline]
       find_tree_dqentry+0x170/0xc4c fs/quota/quota_tree.c:671
       find_tree_dqentry+0x530/0xc4c fs/quota/quota_tree.c:698
       find_tree_dqentry+0x530/0xc4c fs/quota/quota_tree.c:698
       find_tree_dqentry+0x530/0xc4c fs/quota/quota_tree.c:698
       find_dqentry fs/quota/quota_tree.c:716 [inline]
       qtree_read_dquot+0x460/0x73c fs/quota/quota_tree.c:736
       v2_read_dquot+0xc0/0x11c fs/quota/quota_v2.c:336
       dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6797
       dqget+0x660/0xcec fs/quota/dquot.c:986
       __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1515
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577
       ext4_process_orphan+0x5c/0x2b8 fs/ext4/orphan.c:329
       ext4_orphan_cleanup+0x974/0x1134 fs/ext4/orphan.c:474
       __ext4_fill_super fs/ext4/super.c:5534 [inline]
       ext4_fill_super+0x6f04/0x7570 fs/ext4/super.c:5665
       get_tree_bdev+0x360/0x54c fs/super.c:1366
       ext4_get_tree+0x28/0x38 fs/ext4/super.c:5695
       vfs_get_tree+0x90/0x274 fs/super.c:1573
       do_new_mount+0x278/0x8fc fs/namespace.c:3056
       path_mount+0x590/0xe5c fs/namespace.c:3386
       do_mount fs/namespace.c:3399 [inline]
       __do_sys_mount fs/namespace.c:3607 [inline]
       __se_sys_mount fs/namespace.c:3584 [inline]
       __arm64_sys_mount+0x45c/0x594 fs/namespace.c:3584
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
       down_read+0x64/0x308 kernel/locking/rwsem.c:1520
       v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:335
       dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463
       ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6797
       dqget+0x660/0xcec fs/quota/dquot.c:986
       __dquot_initialize+0x344/0xc04 fs/quota/dquot.c:1515
       dquot_initialize+0x24/0x34 fs/quota/dquot.c:1577
       ext4_set_acl+0x184/0x624 fs/ext4/acl.c:237
       set_posix_acl fs/posix_acl.c:1160 [inline]
       posix_acl_xattr_set+0x2f8/0x398 fs/posix_acl.c:1189
       __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
       __vfs_setxattr_noperm+0x110/0x528 fs/xattr.c:216
       __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
       vfs_setxattr+0x1a8/0x344 fs/xattr.c:309
       do_setxattr fs/xattr.c:594 [inline]
       setxattr+0x230/0x294 fs/xattr.c:617
       path_setxattr+0x17c/0x258 fs/xattr.c:636
       __do_sys_lsetxattr fs/xattr.c:659 [inline]
       __se_sys_lsetxattr fs/xattr.c:655 [inline]
       __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:655
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3090 [inline]
       check_prevs_add kernel/locking/lockdep.c:3209 [inline]
       validate_chain kernel/locking/lockdep.c:3825 [inline]
       __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
       lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
       __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
       dquot_commit+0x54/0x240 fs/quota/dquot.c:507
       ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6777
       ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6837
       mark_dquot_dirty fs/quota/dquot.c:372 [inline]
       mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
       __dquot_alloc_space+0xb28/0xf50 fs/quota/dquot.c:1750
       dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline]
       dquot_alloc_space include/linux/quotaops.h:313 [inline]
       dquot_alloc_block include/linux/quotaops.h:337 [inline]
       ext4_mb_new_blocks+0xe8c/0x4680 fs/ext4/mballoc.c:5727
       ext4_ext_map_blocks+0x15a8/0x6638 fs/ext4/extents.c:4339
       ext4_map_blocks+0x810/0x1810 fs/ext4/inode.c:678
       ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889
       ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945
       ext4_append+0x260/0x4cc fs/ext4/namei.c:83
       ext4_init_new_dir+0x294/0x8e4 fs/ext4/namei.c:3030
       ext4_mkdir+0x3d4/0xa64 fs/ext4/namei.c:3076
       vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
       do_mkdirat+0x220/0x510 fs/namei.c:4131
       __do_sys_mkdirat fs/namei.c:4146 [inline]
       __se_sys_mkdirat fs/namei.c:4144 [inline]
       __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
       __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
       invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
       el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
       do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
       el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
       el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
       el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

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.5.1326/8474:
 #0: ffff0000e4964460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:393
 #1: ffff0000f5aa0400 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
 #1: ffff0000f5aa0400 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x204/0x468 fs/namei.c:3876
 #2: ffff0000def65cd0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671
 #3: ffff800015cd8a48 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:349

stack backtrace:
CPU: 1 PID: 8474 Comm: syz.5.1326 Not tainted 6.1.118-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048
 check_noncircular+0x2cc/0x378 kernel/locking/lockdep.c:2170
 check_prev_add kernel/locking/lockdep.c:3090 [inline]
 check_prevs_add kernel/locking/lockdep.c:3209 [inline]
 validate_chain kernel/locking/lockdep.c:3825 [inline]
 __lock_acquire+0x3338/0x7680 kernel/locking/lockdep.c:5049
 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662
 __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799
 dquot_commit+0x54/0x240 fs/quota/dquot.c:507
 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6777
 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6837
 mark_dquot_dirty fs/quota/dquot.c:372 [inline]
 mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412
 __dquot_alloc_space+0xb28/0xf50 fs/quota/dquot.c:1750
 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline]
 dquot_alloc_space include/linux/quotaops.h:313 [inline]
 dquot_alloc_block include/linux/quotaops.h:337 [inline]
 ext4_mb_new_blocks+0xe8c/0x4680 fs/ext4/mballoc.c:5727
 ext4_ext_map_blocks+0x15a8/0x6638 fs/ext4/extents.c:4339
 ext4_map_blocks+0x810/0x1810 fs/ext4/inode.c:678
 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889
 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945
 ext4_append+0x260/0x4cc fs/ext4/namei.c:83
 ext4_init_new_dir+0x294/0x8e4 fs/ext4/namei.c:3030
 ext4_mkdir+0x3d4/0xa64 fs/ext4/namei.c:3076
 vfs_mkdir+0x334/0x4e4 fs/namei.c:4106
 do_mkdirat+0x220/0x510 fs/namei.c:4131
 __do_sys_mkdirat fs/namei.c:4146 [inline]
 __se_sys_mkdirat fs/namei.c:4144 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4144
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585