bcachefs (loop0): error validating btree node at btree extents level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c6c25c03258c59c5 written 48 min_key 0:36028797018963968:0 durability: 1 ptr: 0:27:0 gen 0  
  node offset 8/48 bset u64s 2097 bset byte offset 40: bad k->u64s 0 (min 3 max 253), fixing
invalid bkey in btree_node btree=extents level=0: u64s 10 type deleted 8825211592396076079:4100:0 len 0 ver 0: 
  snapshot == 0: delete?, fixing
bcachefs (loop0): error validating btree node at btree extents level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c6c25c03258c59c5 written 48 min_key 0:36028797018963968:0 durability: 1 ptr: 0:27:0 gen 0  
  node offset 8/48 bset u64s 2088 bset byte offset 360: bad k->u64s 0 (min 3 max 253), fixing
==================================================================
BUG: KASAN: slab-out-of-bounds in bkey_packed_valid+0x488/0x6c0 fs/bcachefs/btree_io.c:865
Read of size 1 at addr ffff88804470c4d0 by task kworker/0:1H/38

CPU: 0 UID: 0 PID: 38 Comm: kworker/0:1H Not tainted 6.14.0-rc5-syzkaller-00013-g99fa936e8e4f #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bcachefs_btree_read_complete btree_node_read_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 bkey_packed_valid+0x488/0x6c0 fs/bcachefs/btree_io.c:865
 validate_bset_keys+0xeb5/0x1af0 fs/bcachefs/btree_io.c:987
 bch2_btree_node_read_done+0x2298/0x6180 fs/bcachefs/btree_io.c:1164
 btree_node_read_work+0x6dc/0x1380 fs/bcachefs/btree_io.c:1358
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xabe/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

The buggy address belongs to the object at ffff88804470c000
 which belongs to the cache proc_inode_cache of size 1232
The buggy address is located 0 bytes to the right of
 allocated 1232-byte region [ffff88804470c000, ffff88804470c4d0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4470c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888045a3e181
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801c6f0780 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800c000c 00000000f5000000 ffff888045a3e181
head: 04fff00000000040 ffff88801c6f0780 dead000000000122 0000000000000000
head: 0000000000000000 00000000800c000c 00000000f5000000 ffff888045a3e181
head: 04fff00000000002 ffffea000111c301 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5321, tgid 5321 (udevd), ts 82693524559, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183
 proc_alloc_inode+0x2a/0xc0 fs/proc/inode.c:57
 alloc_inode+0x65/0x1a0 fs/inode.c:336
 new_inode_pseudo fs/inode.c:1174 [inline]
 new_inode+0x22/0x1d0 fs/inode.c:1193
 proc_pid_make_inode+0x1f/0x130 fs/proc/base.c:1950
 proc_pid_make_base_inode fs/proc/base.c:2001 [inline]
 proc_pid_instantiate+0x54/0x2b0 fs/proc/base.c:3499
 proc_pid_lookup+0x31f/0x480 fs/proc/base.c:3543
 proc_root_lookup+0x1f/0x50 fs/proc/root.c:325
 __lookup_slow+0x296/0x400 fs/namei.c:1793
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88804470c380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804470c400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88804470c480: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff88804470c500: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00
 ffff88804470c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================