loop0: detected capacity change from 0 to 4096
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: writeback.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.60/4452 is trying to acquire lock:
ffff88805cac0278 (&ei->i_data_sem/1){+.+.}-{3:3}, at: swap_inode_boot_loader+0x542/0x10b0 fs/ext4/ioctl.c:176
but task is already holding lock:
ffff88805c8ff020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x28/0x40 fs/ext4/move_extent.c:-1
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&ei->i_data_sem/2){++++}-{3:3}:
down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
ext4_map_blocks+0x33c/0x1b30 fs/ext4/inode.c:598
ext4_getblk+0x176/0x670 fs/ext4/inode.c:870
ext4_bread+0x26/0x180 fs/ext4/inode.c:923
ext4_quota_read+0x1b3/0x3a0 fs/ext4/super.c:6575
read_blk fs/quota/quota_tree.c:55 [inline]
find_tree_dqentry+0x188/0xb30 fs/quota/quota_tree.c:617
find_tree_dqentry+0x3eb/0xb30 fs/quota/quota_tree.c:635
find_dqentry fs/quota/quota_tree.c:647 [inline]
qtree_read_dquot+0x13c/0x680 fs/quota/quota_tree.c:667
v2_read_dquot+0xc0/0x110 fs/quota/quota_v2.c:333
dquot_acquire+0x152/0x520 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2d9/0x4a0 fs/ext4/super.c:6230
dqget+0x778/0xeb0 fs/quota/dquot.c:988
__dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517
ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:327
ext4_orphan_cleanup+0xad2/0x1320 fs/ext4/orphan.c:472
ext4_fill_super+0x8e25/0x95a0 fs/ext4/super.c:5000
mount_bdev+0x287/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}:
down_read+0x44/0x2e0 kernel/locking/rwsem.c:1498
v2_read_dquot+0x4a/0x110 fs/quota/quota_v2.c:332
dquot_acquire+0x152/0x520 fs/quota/dquot.c:463
ext4_acquire_dquot+0x2d9/0x4a0 fs/ext4/super.c:6230
dqget+0x778/0xeb0 fs/quota/dquot.c:988
__dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517
ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:327
ext4_orphan_cleanup+0xad2/0x1320 fs/ext4/orphan.c:472
ext4_fill_super+0x8e25/0x95a0 fs/ext4/super.c:5000
mount_bdev+0x287/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3034
do_mount fs/namespace.c:3377 [inline]
__do_sys_mount fs/namespace.c:3585 [inline]
__se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3562
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #1 (&dquot->dq_lock){+.+.}-{3:3}:
__mutex_lock_common+0x1e3/0x2400 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+0x5a/0x410 fs/quota/dquot.c:507
ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6210
mark_dquot_dirty fs/quota/dquot.c:372 [inline]
mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412
__dquot_alloc_space+0x5d0/0xe20 fs/quota/dquot.c:1752
dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline]
dquot_alloc_space+0x1e/0x50 include/linux/quotaops.h:310
swap_inode_boot_loader+0xe43/0x10b0 fs/ext4/ioctl.c:243
__ext4_ioctl fs/ext4/ioctl.c:1056 [inline]
ext4_ioctl+0x1ad2/0x3820 fs/ext4/ioctl.c:1282
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (&ei->i_data_sem/1){+.+.}-{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:3788 [inline]
__lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
down_write_nested+0x3b/0x60 kernel/locking/rwsem.c:1667
swap_inode_boot_loader+0x542/0x10b0 fs/ext4/ioctl.c:176
__ext4_ioctl fs/ext4/ioctl.c:1056 [inline]
ext4_ioctl+0x1ad2/0x3820 fs/ext4/ioctl.c:1282
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
&ei->i_data_sem/1 --> &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(&ei->i_data_sem/1);
*** DEADLOCK ***
5 locks held by syz.0.60/4452:
#0: ffff88807c156460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write_file+0x5c/0x200 fs/namespace.c:430
#1: ffff88805c8ff198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:787 [inline]
#1: ffff88805c8ff198 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: lock_two_nondirectories+0xd5/0x150 fs/inode.c:1147
#2: ffff88805cac03f0 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: swap_inode_boot_loader+0x70/0x10b0 fs/ext4/ioctl.c:135
#3: ffff88805cac0590 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:832 [inline]
#3: ffff88805cac0590 (mapping.invalidate_lock){++++}-{3:3}, at: swap_inode_boot_loader+0x371/0x10b0 fs/ext4/ioctl.c:152
#4: ffff88805c8ff020 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x28/0x40 fs/ext4/move_extent.c:-1
stack backtrace:
CPU: 0 PID: 4452 Comm: syz.0.60 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
check_noncircular+0x296/0x330 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:3788 [inline]
__lock_acquire+0x2c42/0x7d10 kernel/locking/lockdep.c:5012
lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
down_write_nested+0x3b/0x60 kernel/locking/rwsem.c:1667
swap_inode_boot_loader+0x542/0x10b0 fs/ext4/ioctl.c:176
__ext4_ioctl fs/ext4/ioctl.c:1056 [inline]
ext4_ioctl+0x1ad2/0x3820 fs/ext4/ioctl.c:1282
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc1cfe6a629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffcc4611e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc1d00e3fa0 RCX: 00007fc1cfe6a629
RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004
RBP: 00007fc1cff00b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fc1d00e3fac R14: 00007fc1d00e3fa0 R15: 00007fc1d00e3fa0
</TASK>