loop4: detected capacity change from 0 to 2048
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 8202 Comm: syz.4.1330 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 dump_stack+0x1c/0x5c lib/dump_stack.c:113
 add_chain_cache kernel/locking/lockdep.c:-1 [inline]
 lookup_chain_cache_add kernel/locking/lockdep.c:3735 [inline]
 validate_chain kernel/locking/lockdep.c:3756 [inline]
 __lock_acquire+0x1b30/0x651c kernel/locking/lockdep.c:5012
 lock_acquire+0x1f4/0x620 kernel/locking/lockdep.c:5623
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162
 lock_timer_base+0x11c/0x224 kernel/time/timer.c:946
 __mod_timer+0x100/0xb44 kernel/time/timer.c:1019
 mod_timer+0x2c/0x3c kernel/time/timer.c:1113
 blk_add_timer+0x208/0x2b0 block/blk-timeout.c:164
 blk_mq_start_request+0x1e4/0x4d4 block/blk-mq.c:737
 loop_queue_rq+0x88/0xac0 drivers/block/loop.c:2173
 __blk_mq_issue_directly block/blk-mq.c:2014 [inline]
 __blk_mq_try_issue_directly+0x3e8/0x69c block/blk-mq.c:2070
 blk_mq_try_issue_directly+0xb8/0x270 block/blk-mq.c:2101
 blk_mq_submit_bio+0xcf8/0x1698 block/blk-mq.c:-1
 __submit_bio+0x5ec/0x624 block/blk-core.c:917
 __submit_bio_noacct_mq block/blk-core.c:997 [inline]
 submit_bio_noacct+0x52c/0x624 block/blk-core.c:1027
 submit_bio+0x374/0x5e0 block/blk-core.c:1089
 submit_bh_wbc+0x4a8/0x5f8 fs/buffer.c:3056
 submit_bh fs/buffer.c:3062 [inline]
 __bread_slow fs/buffer.c:1180 [inline]
 __bread_gfp+0xf4/0x33c fs/buffer.c:1384
 sb_bread include/linux/buffer_head.h:337 [inline]
 hpfs_map_sector+0x110/0x2cc fs/hpfs/buffer.c:82
 hpfs_fill_super+0x26c/0x1800 fs/hpfs/super.c:589
 mount_bdev+0x264/0x358 fs/super.c:1400
 hpfs_mount+0x44/0x58 fs/hpfs/super.c:758
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
 vfs_get_tree+0x90/0x274 fs/super.c:1530
 do_new_mount+0x228/0x810 fs/namespace.c:3014
 path_mount+0x5b4/0x1000 fs/namespace.c:3344
 do_mount fs/namespace.c:3357 [inline]
 __do_sys_mount fs/namespace.c:3565 [inline]
 __se_sys_mount fs/namespace.c:3542 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3542
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
hpfs: hpfs_map_sector(): read error