syz-executor.5: attempt to access beyond end of device
loop162: rw=0, sector=0, nr_sectors = 8 limit=0
EXT4-fs (loop5): couldn't read superblock of external journal
======================================================
WARNING: possible circular locking dependency detected
6.6.0-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.5/7135 is trying to acquire lock:
ffff888076dcf4c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xff/0x770 block/bdev.c:884
but task is already holding lock:
ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_get_journal_blkdev fs/ext4/super.c:5861 [inline]
ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_open_dev_journal fs/ext4/super.c:5933 [inline]
ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_load_journal fs/ext4/super.c:5996 [inline]
ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_load_and_init_journal+0x30f/0x2550 fs/ext4/super.c:4906
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (&type->s_umount_key#31){++++}-{3:3}:
down_read+0xb1/0xa40 kernel/locking/rwsem.c:1520
__super_lock fs/super.c:58 [inline]
super_lock+0x176/0x390 fs/super.c:117
super_lock_shared fs/super.c:146 [inline]
super_lock_shared_active fs/super.c:1431 [inline]
fs_bdev_sync+0xa5/0x170 fs/super.c:1466
blkdev_flushbuf block/ioctl.c:372 [inline]
blkdev_common_ioctl+0x889/0x2860 block/ioctl.c:502
blkdev_ioctl+0x520/0x730 block/ioctl.c:624
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #1 (&bdev->bd_holder_lock){+.+.}-{3:3}:
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747
bdev_mark_dead+0x32/0x1a0 block/bdev.c:961
disk_force_media_change+0x145/0x1c0 block/disk-events.c:302
__loop_clr_fd+0x3df/0x690 drivers/block/loop.c:1174
blkdev_put+0x5d2/0x770
deactivate_locked_super+0xa4/0x110 fs/super.c:481
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254
task_work_run+0x24a/0x300 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296
do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
-> #0 (&disk->open_mutex){+.+.}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5136
lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747
blkdev_put+0xff/0x770 block/bdev.c:884
ext4_get_journal_blkdev fs/ext4/super.c:5920 [inline]
ext4_open_dev_journal fs/ext4/super.c:5933 [inline]
ext4_load_journal fs/ext4/super.c:5996 [inline]
ext4_load_and_init_journal+0xc26/0x2550 fs/ext4/super.c:4906
__ext4_fill_super fs/ext4/super.c:5374 [inline]
ext4_fill_super+0x4863/0x6d10 fs/ext4/super.c:5703
get_tree_bdev+0x416/0x5b0 fs/super.c:1577
vfs_get_tree+0x8c/0x280 fs/super.c:1750
do_new_mount+0x28f/0xae0 fs/namespace.c:3335
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
other info that might help us debug this:
Chain exists of:
&disk->open_mutex --> &bdev->bd_holder_lock --> &type->s_umount_key#31
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&type->s_umount_key#31);
lock(&bdev->bd_holder_lock);
lock(&type->s_umount_key#31);
lock(&disk->open_mutex);
*** DEADLOCK ***
1 lock held by syz-executor.5/7135:
#0: ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_get_journal_blkdev fs/ext4/super.c:5861 [inline]
#0: ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_open_dev_journal fs/ext4/super.c:5933 [inline]
#0: ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_load_journal fs/ext4/super.c:5996 [inline]
#0: ffff88803524e0e0 (&type->s_umount_key#31){++++}-{3:3}, at: ext4_load_and_init_journal+0x30f/0x2550 fs/ext4/super.c:4906
stack backtrace:
CPU: 1 PID: 7135 Comm: syz-executor.5 Not tainted 6.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
check_noncircular+0x375/0x4a0 kernel/locking/lockdep.c:2187
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain kernel/locking/lockdep.c:3868 [inline]
__lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5136
lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753
__mutex_lock_common kernel/locking/mutex.c:603 [inline]
__mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747
blkdev_put+0xff/0x770 block/bdev.c:884
ext4_get_journal_blkdev fs/ext4/super.c:5920 [inline]
ext4_open_dev_journal fs/ext4/super.c:5933 [inline]
ext4_load_journal fs/ext4/super.c:5996 [inline]
ext4_load_and_init_journal+0xc26/0x2550 fs/ext4/super.c:4906
__ext4_fill_super fs/ext4/super.c:5374 [inline]
ext4_fill_super+0x4863/0x6d10 fs/ext4/super.c:5703
get_tree_bdev+0x416/0x5b0 fs/super.c:1577
vfs_get_tree+0x8c/0x280 fs/super.c:1750
do_new_mount+0x28f/0xae0 fs/namespace.c:3335
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fcf7567e1ea
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcf762f4ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf762f4f80 RCX: 00007fcf7567e1ea
RDX: 0000000020000040 RSI: 0000000020000500 RDI: 00007fcf762f4f40
RBP: 0000000020000040 R08: 00007fcf762f4f80 R09: 0000000001400009
R10: 0000000001400009 R11: 0000000000000202 R12: 0000000020000500
R13: 00007fcf762f4f40 R14: 00000000000004d2 R15: 000000000000002c
</TASK>