BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 1 PID: 7271 Comm: syz.7.544 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
 seqcount_lockdep_reader_access include/linux/seqlock.h:102 [inline]
 read_seqbegin include/linux/seqlock.h:893 [inline]
 btrfs_get_alloc_profile+0x14c/0xad4 fs/btrfs/block-group.c:125
 get_alloc_profile_by_root fs/btrfs/extent-tree.c:2510 [inline]
 btrfs_reserve_extent+0x1b8/0x520 fs/btrfs/extent-tree.c:4607
 btrfs_alloc_tree_block+0x19c/0x1164 fs/btrfs/extent-tree.c:5034
 btrfs_force_cow_block+0x3ac/0x188c fs/btrfs/ctree.c:450
 btrfs_cow_block+0x2d0/0x708 fs/btrfs/ctree.c:623
 btrfs_search_slot+0xa50/0x237c fs/btrfs/ctree.c:-1
 btrfs_insert_empty_items+0xa4/0x178 fs/btrfs/ctree.c:4185
 btrfs_create_new_inode+0xc64/0x20bc fs/btrfs/inode.c:6587
 btrfs_create_common+0x16c/0x240 fs/btrfs/inode.c:6818
 btrfs_create+0x104/0x128 fs/btrfs/inode.c:6858
 lookup_open fs/namei.c:3490 [inline]
 open_last_lookups fs/namei.c:3558 [inline]
 path_openat+0xe18/0x26bc 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+0x98/0x2b4 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
BTRFS info (device loop7): last unmount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf