loop0: detected capacity change from 0 to 512
ext4 filesystem being mounted at /root/syzkaller.DscHSK/227/bus supports timestamps until 2038-01-19 (0x7fffffff)
======================================================
WARNING: possible circular locking dependency detected
5.15.180-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor293/4651 is trying to acquire lock:
ffff88806f0e1928 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x57/0x510 fs/quota/dquot.c:507
but task is already holding lock:
ffff88806f0af020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9a2/0x1c70 fs/ext4/inode.c:665
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&ei->i_data_sem/2){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597
ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
ext4_quota_read+0x1a1/0x2c0 fs/ext4/super.c:6528
read_blk fs/quota/quota_tree.c:55 [inline]
find_tree_dqentry+0x192/0xb60 fs/quota/quota_tree.c:617
find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635
find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635
find_tree_dqentry+0x41a/0xb60 fs/quota/quota_tree.c:635
find_dqentry fs/quota/quota_tree.c:647 [inline]
qtree_read_dquot+0x13f/0x650 fs/quota/quota_tree.c:667
v2_read_dquot+0xbe/0x100 fs/quota/quota_v2.c:333
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6200
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x45e/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498
v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332
dquot_acquire+0x188/0x680 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6200
dqget+0x762/0xe90 fs/quota/dquot.c:988
__dquot_initialize+0x45e/0xea0 fs/quota/dquot.c:1517
ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329
ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474
ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4975
mount_bdev+0x2c9/0x3f0 fs/super.c:1400
legacy_get_tree+0xeb/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x2ba/0xb40 fs/namespace.c:3012
do_mount fs/namespace.c:3355 [inline]
__do_sys_mount fs/namespace.c:3563 [inline]
__se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (&dquot->dq_lock){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6180
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_alloc_space+0xdd8/0x1090 fs/quota/dquot.c:1752
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+0x12d8/0x4d60 fs/ext4/mballoc.c:5739
ext4_ext_map_blocks+0x1b01/0x7630 fs/ext4/extents.c:4339
ext4_map_blocks+0xa66/0x1c70 fs/ext4/inode.c:672
ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
ext4_append+0x31f/0x5c0 fs/ext4/namei.c:83
ext4_init_new_dir+0x33a/0xa20 fs/ext4/namei.c:3030
ext4_mkdir+0x4f2/0xce0 fs/ext4/namei.c:3076
vfs_mkdir+0x3b6/0x590 fs/namei.c:4065
do_mkdirat+0x260/0x520 fs/namei.c:4090
__do_sys_mkdir fs/namei.c:4110 [inline]
__se_sys_mkdir fs/namei.c:4108 [inline]
__x64_sys_mkdir+0x6a/0x80 fs/namei.c:4108
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
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-executor293/4651:
#0: ffff888074414460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377
#1: ffff88806f07d3b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:822 [inline]
#1: ffff88806f07d3b0 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x25c/0x530 fs/namei.c:3835
#2: ffff88806f0af020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x9a2/0x1c70 fs/ext4/inode.c:665
#3: ffffffff8cc44738 (dquot_srcu){....}-{0:0}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
stack backtrace:
CPU: 1 PID: 4651 Comm: syz-executor293 Not tainted 5.15.180-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 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+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
dquot_commit+0x57/0x510 fs/quota/dquot.c:507
ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6180
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412
__dquot_alloc_space+0xdd8/0x1090 fs/quota/dquot.c:1752
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+0x12d8/0x4d60 fs/ext4/mballoc.c:5739
ext4_ext_map_blocks+0x1b01/0x7630 fs/ext4/extents.c:4339
ext4_map_blocks+0xa66/0x1c70 fs/ext4/inode.c:672
ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869
ext4_bread+0x2a/0x170 fs/ext4/inode.c:922
ext4_append+0x31f/0x5c0 fs/ext4/namei.c:83
ext4_init_new_dir+0x33a/0xa20 fs/ext4/namei.c:3030
ext4_mkdir+0x4f2/0xce0 fs/ext4/namei.c:3076
vfs_mkdir+0x3b6/0x590 fs/namei.c:4065
do_mkdirat+0x260/0x520 fs/namei.c:4090
__do_sys_mkdir fs/namei.c:4110 [inline]
__se_sys_mkdir fs/namei.c:4108 [inline]
__x64_sys_mkdir+0x6a/0x80 fs/namei.c:4108
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc08f71b267
Code: 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffebf937c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc08f71b267
RDX: 0000000000000800 RSI: 00000000000001ff RDI: 0000200000000440
RBP: 0000200000000440 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffebf937ce0 R14: 0000000000000000 R15: 0000000000000000
EXT4-fs error (device loop0): ext4_do_update_inode:5174: inode #2: comm syz-executor293: corrupted inode contents
EXT4-fs error (device loop0): ext4_dirty_inode:6010: inode #2: comm syz-executor293: mark_inode_dirty error
EXT4-fs error (device loop0): ext4_do_update_inode:5174: inode #2: comm syz-executor293: corrupted inode contents
EXT4-fs error (device loop0): __ext4_ext_dirty:183: inode #2: comm syz-executor293: mark_inode_dirty error
show_signal_msg: 59 callbacks suppressed
syz-executor293[4651]: segfault at 0 ip 00007fc08f71659e sp 00007ffebf937c48 error 4 in syz-executor2930249106[7fc08f6e6000+7f000]
Code: fd d7 c9 0f bc d1 c5 fe 7f 27 c5 fe 7f 6f 20 c5 fe 7f 77 40 c5 fe 7f 7f 60 49 83 c0 1f 49 29 d0 48 8d 7c 17 61 e9 d2 04 00 00 fe 6f 1e c5 fe 6f 56 20 c5 fd 74 cb c5 fd d7 d1 49 83 f8 21 0f
----------------
Code disassembly (best guess):
0: fd std
1: d7 xlat %ds:(%rbx)
2: c9 leave
3: 0f bc d1 bsf %ecx,%edx
6: c5 fe 7f 27 vmovdqu %ymm4,(%rdi)
a: c5 fe 7f 6f 20 vmovdqu %ymm5,0x20(%rdi)
f: c5 fe 7f 77 40 vmovdqu %ymm6,0x40(%rdi)
14: c5 fe 7f 7f 60 vmovdqu %ymm7,0x60(%rdi)
19: 49 83 c0 1f add $0x1f,%r8
1d: 49 29 d0 sub %rdx,%r8
20: 48 8d 7c 17 61 lea 0x61(%rdi,%rdx,1),%rdi
25: e9 d2 04 00 00 jmp 0x4fc
* 2a: c5 fe 6f 1e vmovdqu (%rsi),%ymm3 <-- trapping instruction
2e: c5 fe 6f 56 20 vmovdqu 0x20(%rsi),%ymm2
33: c5 fd 74 cb vpcmpeqb %ymm3,%ymm0,%ymm1
37: c5 fd d7 d1 vpmovmskb %ymm1,%edx
3b: 49 83 f8 21 cmp $0x21,%r8
3f: 0f .byte 0xf