erofs: (device loop5): mounted with root inode @ nid 36.
overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 7159 Comm: syz.5.831 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c 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:3772 [inline]
 validate_chain kernel/locking/lockdep.c:3793 [inline]
 __lock_acquire+0x1864/0x6800 kernel/locking/lockdep.c:5049
 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x54/0x6c kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:351 [inline]
 unlock_new_inode+0x13c/0x258 fs/inode.c:1129
 ovl_get_inode+0xb18/0xb90 fs/overlayfs/inode.c:1282
 ovl_lookup+0x1024/0x13c8 fs/overlayfs/namei.c:1111
 __lookup_slow+0x25c/0x38c fs/namei.c:1698
 lookup_slow fs/namei.c:1715 [inline]
 lookup_one_unlocked+0x144/0x264 fs/namei.c:2809
 ovl_lookup_positive_unlocked fs/overlayfs/namei.c:207 [inline]
 ovl_lookup_single+0x10c/0x850 fs/overlayfs/namei.c:233
 ovl_lookup_layer+0x2e0/0x3a4 fs/overlayfs/namei.c:320
 ovl_lookup+0x640/0x13c8 fs/overlayfs/namei.c:923
 lookup_open fs/namei.c:3468 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0xc98/0x26bc fs/namei.c:3788
 do_filp_open+0x194/0x384 fs/namei.c:3818
 do_sys_openat2+0x134/0x3f4 fs/open.c:1320
 do_sys_open fs/open.c:1336 [inline]
 __do_sys_openat fs/open.c:1352 [inline]
 __se_sys_openat fs/open.c:1347 [inline]
 __arm64_sys_openat+0x118/0x14c fs/open.c:1347
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
erofs: (device loop5): z_erofs_lz4_decompress_mem: failed to decompress -26 in[46, 4050] out[4096]