BTRFS info (device loop1): creating free space tree
BTRFS info (device loop1): setting compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop1): setting compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BUG: MAX_LOCKDEP_CHAINS too low!
turning off the locking correctness validator.
CPU: 0 PID: 12138 Comm: syz.1.1863 Not tainted 5.15.185-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
 local_lock_acquire+0x3c/0x98 include/linux/local_lock_internal.h:29
 put_cpu_partial+0x68/0x218 mm/slub.c:2556
 get_partial_node+0x19c/0x2b8 mm/slub.c:2144
 get_partial mm/slub.c:2232 [inline]
 ___slab_alloc+0x3ac/0xda8 mm/slub.c:3003
 __slab_alloc+0x68/0xc0 mm/slub.c:3095
 slab_alloc_node mm/slub.c:3186 [inline]
 slab_alloc mm/slub.c:3228 [inline]
 __kmalloc+0x2ec/0x44c mm/slub.c:4403
 kmalloc include/linux/slab.h:609 [inline]
 kzalloc include/linux/slab.h:735 [inline]
 alloc_btrfs_io_context fs/btrfs/volumes.c:5984 [inline]
 __btrfs_map_block+0x91c/0x1f68 fs/btrfs/volumes.c:6637
 btrfs_map_bio+0x138/0x10fc fs/btrfs/volumes.c:6862
 btrfs_submit_metadata_bio+0x420/0x590 fs/btrfs/disk-io.c:-1
 submit_one_bio fs/btrfs/extent_io.c:182 [inline]
 flush_write_bio+0x160/0x20c fs/btrfs/extent_io.c:212
 btree_write_cache_pages+0x1280/0x146c fs/btrfs/extent_io.c:4897
 btree_writepages+0x6c/0x190 fs/btrfs/disk-io.c:935
 do_writepages+0x36c/0x578 mm/page-writeback.c:2386
 filemap_fdatawrite_wbc+0x1d4/0x234 mm/filemap.c:400
 __filemap_fdatawrite_range mm/filemap.c:433 [inline]
 filemap_fdatawrite_range+0xac/0xf4 mm/filemap.c:451
 btrfs_write_marked_extents+0x1bc/0x36c fs/btrfs/transaction.c:1101
 btrfs_write_and_wait_transaction+0xec/0x210 fs/btrfs/transaction.c:1213
 btrfs_commit_transaction+0x164c/0x3044 fs/btrfs/transaction.c:2445
 btrfs_create_free_space_tree+0x888/0xde4 fs/btrfs/free-space-tree.c:1175
 btrfs_start_pre_rw_mount+0x438/0x568 fs/btrfs/disk-io.c:3125
 open_ctree+0x1ef0/0x27b8 fs/btrfs/disk-io.c:3634
 btrfs_fill_super+0x1b4/0x2d4 fs/btrfs/super.c:1387
 btrfs_mount_root+0x730/0x780 fs/btrfs/super.c:1751
 legacy_get_tree+0xd4/0x16c fs/fs_context.c:611
 vfs_get_tree+0x90/0x274 fs/super.c:1530
 fc_mount fs/namespace.c:996 [inline]
 vfs_kern_mount+0xdc/0x178 fs/namespace.c:1026
 btrfs_mount+0x2a0/0x8d4 fs/btrfs/super.c:1811
 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:3010
 path_mount+0x5b4/0x1000 fs/namespace.c:3340
 do_mount fs/namespace.c:3353 [inline]
 __do_sys_mount fs/namespace.c:3561 [inline]
 __se_sys_mount fs/namespace.c:3538 [inline]
 __arm64_sys_mount+0x514/0x5e4 fs/namespace.c:3538
 __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