loop0: detected capacity change from 0 to 32768
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=ro,errors=continue,metadata_checksum=none,data_checksum=none,compression=lz4,nojournal_transaction_names,read_only
invalid bkey in superblock btree=extents level=0: u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 4e0410879b0c2f04 written 16 min_key POS_MIN durability: 1 ptr: 0:27:0 gen 0
  size == 0: delete?, fixing
bcachefs (loop0): recovering from clean shutdown, journal seq 13
bcachefs (loop0): Version upgrade from 1.19: autofix_errors to 1.7: mi_btree_bitmap incomplete
Doing compatible version upgrade from 1.19: autofix_errors to 1.20: directory_size
bcachefs (loop0): error validating btree node on loop0 at btree alloc level 0/0
  u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 1818ce08861e3527 written 40 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0  
  node offset 8/40 bset u64s 375: checksum error, type chacha20_poly1305_128: got af0f645665eba7125b1d43a878a892b7 should be 61ec379a8789477e76ff1a5280fd6dbd, fixing
==================================================================
BUG: KASAN: use-after-free in crypto_poly1305_update+0x28/0x40 arch/x86/crypto/poly1305_glue.c:230
Read of size 8 at addr ffff888055472070 by task syz.0.0/5315

CPU: 0 UID: 0 PID: 5315 Comm: syz.0.0 Not tainted 6.14.0-syzkaller-03565-gf6e0150b2003 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
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
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x28f/0x2a0 mm/kasan/generic.c:189
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 crypto_poly1305_update+0x28/0x40 arch/x86/crypto/poly1305_glue.c:230
 bch2_checksum+0x5fc/0x780 fs/bcachefs/checksum.c:239
 bch2_btree_node_read_done+0x145e/0x62b0 fs/bcachefs/btree_io.c:1130
 btree_node_read_work+0x6e1/0x1380 fs/bcachefs/btree_io.c:1358
 bch2_btree_node_read+0x2446/0x2a10 fs/bcachefs/btree_io.c:-1
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1789 [inline]
 bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1811
 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581
 bch2_fs_recovery+0x28b1/0x3de0 fs/bcachefs/recovery.c:928
 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041
 bch2_fs_get_tree+0xdc0/0x17b0 fs/bcachefs/fs.c:2203
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f03f758e90a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f03f833de68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f03f833def0 RCX: 00007f03f758e90a
RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007f03f833deb0
RBP: 00002000000000c0 R08: 00007f03f833def0 R09: 0000000003218411
R10: 0000000003218411 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f03f833deb0 R14: 000000000000f63d R15: 0000200000000080
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x55472
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 0000000000000000 ffffea0001551c88 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 5, migratetype Reclaimable, gfp_mask 0x452cd0(GFP_KERNEL_ACCOUNT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_RECLAIMABLE), pid 5315, tgid 5314 (syz.0.0), ts 59431205954, free_ts 59547392327
 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+0x3695/0x37e0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740
 __alloc_pages_noprof+0xa/0x30 mm/page_alloc.c:4774
 __alloc_pages_node_noprof include/linux/gfp.h:265 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:292 [inline]
 ___kmalloc_large_node+0x92/0x210 mm/slub.c:4262
 __kmalloc_large_node_noprof+0x1a/0x80 mm/slub.c:4290
 __do_kmalloc_node mm/slub.c:4306 [inline]
 __kvmalloc_node_noprof+0x7c/0x5a0 mm/slub.c:5003
 btree_node_data_alloc+0xdb/0x260 fs/bcachefs/btree_cache.c:156
 __bch2_btree_node_mem_alloc+0x201/0x420 fs/bcachefs/btree_cache.c:201
 bch2_fs_btree_cache_init+0x27a/0x630 fs/bcachefs/btree_cache.c:655
 bch2_fs_alloc fs/bcachefs/super.c:919 [inline]
 bch2_fs_open+0x2d3d/0x31f0 fs/bcachefs/super.c:2065
 bch2_fs_get_tree+0x740/0x17b0 fs/bcachefs/fs.c:2190
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94
page last free pid 5315 tgid 5314 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 __free_pages_ok+0xbc8/0xe40 mm/page_alloc.c:1271
 __folio_put+0x2b5/0x360 mm/swap.c:112
 folio_put include/linux/mm.h:1492 [inline]
 free_large_kmalloc+0x143/0x1e0 mm/slub.c:4758
 kfree+0x216/0x430 mm/slub.c:4826
 btree_bounce_free fs/bcachefs/btree_io.c:111 [inline]
 bch2_btree_node_read_done+0x3dcd/0x62b0 fs/bcachefs/btree_io.c:1243
 btree_node_read_work+0x6e1/0x1380 fs/bcachefs/btree_io.c:1358
 bch2_btree_node_read+0x2446/0x2a10 fs/bcachefs/btree_io.c:-1
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1789 [inline]
 bch2_btree_root_read+0x656/0x7e0 fs/bcachefs/btree_io.c:1811
 read_btree_roots+0x3d7/0xa80 fs/bcachefs/recovery.c:581
 bch2_fs_recovery+0x28b1/0x3de0 fs/bcachefs/recovery.c:928
 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041
 bch2_fs_get_tree+0xdc0/0x17b0 fs/bcachefs/fs.c:2203
 vfs_get_tree+0x90/0x2b0 fs/super.c:1759
 do_new_mount+0x2cf/0xb70 fs/namespace.c:3878
 do_mount fs/namespace.c:4218 [inline]
 __do_sys_mount fs/namespace.c:4429 [inline]
 __se_sys_mount+0x38c/0x400 fs/namespace.c:4406
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94

Memory state around the buggy address:
 ffff888055471f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888055471f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888055472000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                             ^
 ffff888055472080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888055472100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================