EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc7-syzkaller-g14f8db1c0f9a #0 Not tainted
------------------------------------------------------
syz-executor.0/12261 is trying to acquire lock:
ffff00012b22a968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x54/0x240 fs/quota/dquot.c:479
but task is already holding lock:
ffff0001313520a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x794/0x1884 fs/ext4/inode.c:644
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_write+0x230/0x54c fs/ext4/super.c:7135
write_blk fs/quota/quota_tree.c:64 [inline]
get_free_dqblk+0x284/0x570 fs/quota/quota_tree.c:130
do_insert_tree+0x200/0x1438 fs/quota/quota_tree.c:340
do_insert_tree+0x534/0x1438 fs/quota/quota_tree.c:375
do_insert_tree+0x534/0x1438 fs/quota/quota_tree.c:375
do_insert_tree+0x534/0x1438 fs/quota/quota_tree.c:375
dq_insert_tree fs/quota/quota_tree.c:401 [inline]
qtree_write_dquot+0x318/0x488 fs/quota/quota_tree.c:420
v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:358
dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:444
ext4_acquire_dquot+0x270/0x398 fs/ext4/super.c:6770
dqget+0x844/0xc48 fs/quota/dquot.c:914
__dquot_initialize+0x344/0xb54 fs/quota/dquot.c:1492
dquot_initialize+0x24/0x34 fs/quota/dquot.c:1550
ext4_mkdir+0x15c/0xa64 fs/ext4/namei.c:2984
vfs_mkdir+0x240/0x3a8 fs/namei.c:4038
do_mkdirat+0x20c/0x610 fs/namei.c:4061
__do_sys_mkdirat fs/namei.c:4076 [inline]
__se_sys_mkdirat fs/namei.c:4074 [inline]
__arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074
__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+0x344/0xb54 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_alloc_space+0x488/0xb00 fs/quota/dquot.c:1722
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+0xed4/0x43dc fs/ext4/mballoc.c:5571
ext4_ext_map_blocks+0x1378/0x5f50 fs/ext4/extents.c:4286
ext4_map_blocks+0x828/0x1884 fs/ext4/inode.c:651
ext4_getblk+0x198/0x6ec fs/ext4/inode.c:863
ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:919
ext4_append+0x260/0x4cc fs/ext4/namei.c:83
ext4_init_new_dir+0x294/0x8e4 fs/ext4/namei.c:2955
ext4_mkdir+0x3d4/0xa64 fs/ext4/namei.c:3001
vfs_mkdir+0x240/0x3a8 fs/namei.c:4038
do_mkdirat+0x20c/0x610 fs/namei.c:4061
__do_sys_mkdirat fs/namei.c:4076 [inline]
__se_sys_mkdirat fs/namei.c:4074 [inline]
__arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074
__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.0/12261:
#0: ffff00012a4ba460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:394
#1: ffff0001313e4a38 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline]
#1: ffff0001313e4a38 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: filename_create+0x200/0x464 fs/namei.c:3808
#2: ffff0001313520a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x794/0x1884 fs/ext4/inode.c:644
#3: ffff80001606fae8 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x10/0x4c include/linux/rcupdate.h:326
stack backtrace:
CPU: 0 PID: 12261 Comm: syz-executor.0 Not tainted 6.3.0-rc7-syzkaller-g14f8db1c0f9a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
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_alloc_space+0x488/0xb00 fs/quota/dquot.c:1722
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+0xed4/0x43dc fs/ext4/mballoc.c:5571
ext4_ext_map_blocks+0x1378/0x5f50 fs/ext4/extents.c:4286
ext4_map_blocks+0x828/0x1884 fs/ext4/inode.c:651
ext4_getblk+0x198/0x6ec fs/ext4/inode.c:863
ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:919
ext4_append+0x260/0x4cc fs/ext4/namei.c:83
ext4_init_new_dir+0x294/0x8e4 fs/ext4/namei.c:2955
ext4_mkdir+0x3d4/0xa64 fs/ext4/namei.c:3001
vfs_mkdir+0x240/0x3a8 fs/namei.c:4038
do_mkdirat+0x20c/0x610 fs/namei.c:4061
__do_sys_mkdirat fs/namei.c:4076 [inline]
__se_sys_mkdirat fs/namei.c:4074 [inline]
__arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4074
__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