netlink: 512 bytes leftover after parsing attributes in process `syz.7.1980'.
======================================================
WARNING: possible circular locking dependency detected
6.13.0-rc6-next-20250107-syzkaller #0 Not tainted
------------------------------------------------------
syz.7.1980/13005 is trying to acquire lock:
ffff8880566535a0 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:865 [inline]
ffff8880566535a0 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: __generic_file_fsync+0x97/0x1a0 fs/libfs.c:1529
but task is already holding lock:
ffff88802564d8b0 (&q->q_usage_counter(io)#23){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&q->q_usage_counter(io)#23){++++}-{0:0}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
bio_queue_enter block/blk.h:75 [inline]
blk_mq_submit_bio+0x1546/0x23a0 block/blk-mq.c:3094
__submit_bio+0x2c6/0x560 block/blk-core.c:629
__submit_bio_noacct_mq block/blk-core.c:710 [inline]
submit_bio_noacct_nocheck+0x4d3/0xe30 block/blk-core.c:739
submit_bh fs/buffer.c:2819 [inline]
__sync_dirty_buffer+0x23d/0x390 fs/buffer.c:2857
udf_update_inode+0x1d21/0x2e80 fs/udf/inode.c:1935
udf_sync_inode fs/udf/inode.c:1709 [inline]
inode_getblk fs/udf/inode.c:934 [inline]
udf_map_block+0x432f/0x5340 fs/udf/inode.c:447
udf_bread+0x14c/0x620 fs/udf/inode.c:1242
udf_fiiter_append_blk+0x3aa/0x9f0 fs/udf/directory.c:477
udf_fiiter_add_entry+0xcb6/0x1ff0 fs/udf/namei.c:284
udf_mkdir+0x135/0x710 fs/udf/namei.c:438
vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311
do_mkdirat+0x264/0x3a0 fs/namei.c:4334
__do_sys_mkdirat fs/namei.c:4349 [inline]
__se_sys_mkdirat fs/namei.c:4347 [inline]
__x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #1 (&ei->i_data_sem#2){+.+.}-{4:4}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
udf_release_file+0xb1/0x120 fs/udf/file.c:183
__fput+0x3e9/0x9f0 fs/file_table.c:450
task_work_run+0x24f/0x310 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa2a/0x28e0 kernel/exit.c:938
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x16b2/0x1750 kernel/signal.c:3017
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:865 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1529
generic_file_fsync+0x70/0xf0 fs/libfs.c:1566
__loop_update_dio+0x1a4/0x500 drivers/block/loop.c:204
loop_set_status+0x62b/0x8f0 drivers/block/loop.c:1289
lo_ioctl+0xcbc/0x1f50
blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&sb->s_type->i_mutex_key#30 --> &ei->i_data_sem#2 --> &q->q_usage_counter(io)#23
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&q->q_usage_counter(io)#23);
lock(&ei->i_data_sem#2);
lock(&q->q_usage_counter(io)#23);
lock(&sb->s_type->i_mutex_key#30);
*** DEADLOCK ***
3 locks held by syz.7.1980/13005:
#0: ffff88802573b360 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_set_status+0x2a/0x8f0 drivers/block/loop.c:1251
#1: ffff88802564d8b0 (&q->q_usage_counter(io)#23){++++}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
#2: ffff88802564d8e8 (&q->q_usage_counter(queue)#7){+.+.}-{0:0}, at: loop_set_status+0x1e4/0x8f0 drivers/block/loop.c:1267
stack backtrace:
CPU: 0 UID: 0 PID: 13005 Comm: syz.7.1980 Not tainted 6.13.0-rc6-next-20250107-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2076
check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2208
check_prev_add kernel/locking/lockdep.c:3163 [inline]
check_prevs_add kernel/locking/lockdep.c:3282 [inline]
validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3906
__lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5228
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
down_write+0x99/0x220 kernel/locking/rwsem.c:1577
inode_lock include/linux/fs.h:865 [inline]
__generic_file_fsync+0x97/0x1a0 fs/libfs.c:1529
generic_file_fsync+0x70/0xf0 fs/libfs.c:1566
__loop_update_dio+0x1a4/0x500 drivers/block/loop.c:204
loop_set_status+0x62b/0x8f0 drivers/block/loop.c:1289
lo_ioctl+0xcbc/0x1f50
blkdev_ioctl+0x57d/0x6a0 block/ioctl.c:693
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:906 [inline]
__se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5c62785d29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5c63548038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5c62975fa0 RCX: 00007f5c62785d29
RDX: 00000000200002c0 RSI: 0000000000004c02 RDI: 0000000000000008
RBP: 00007f5c62801b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5c62975fa0 R15: 00007ffc8e02aeb8
</TASK>