REISERFS (device loop0): checking transaction log (loop0)
REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
==================================================================
BUG: KASAN: out-of-bounds in leaf_paste_in_buffer+0x1b8/0xab0 fs/reiserfs/lbalance.c:1017
Read of size 18446744073709551305 at addr ffff888070e1f000 by task syz-executor303/3543

CPU: 1 PID: 3543 Comm: syz-executor303 Not tainted 6.1.53-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15f/0x4f0 mm/kasan/report.c:395
 kasan_report+0x136/0x160 mm/kasan/report.c:495
 kasan_check_range+0x27f/0x290 mm/kasan/generic.c:189
 memmove+0x25/0x60 mm/kasan/shadow.c:54
 leaf_paste_in_buffer+0x1b8/0xab0 fs/reiserfs/lbalance.c:1017
 balance_leaf_new_nodes_paste_whole fs/reiserfs/do_balan.c:1171 [inline]
 balance_leaf_new_nodes_paste fs/reiserfs/do_balan.c:1215 [inline]
 balance_leaf_new_nodes fs/reiserfs/do_balan.c:1246 [inline]
 balance_leaf+0x667c/0x12510 fs/reiserfs/do_balan.c:1450
 do_balance+0x309/0x8f0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x73b/0x880 fs/reiserfs/stree.c:2159
 reiserfs_get_block+0x2259/0x5150 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x544/0x1a30 fs/buffer.c:1991
 reiserfs_write_begin+0x249/0x510 fs/reiserfs/inode.c:2775
 generic_cont_expand_simple+0x187/0x2a0 fs/buffer.c:2347
 reiserfs_setattr+0x606/0x11c0 fs/reiserfs/inode.c:3305
 notify_change+0xdcd/0x1080 fs/attr.c:483
 do_truncate+0x21c/0x300 fs/open.c:65
 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f6bcb068679
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0bedf7f8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f6bcb068679
RDX: 00007f6bcb068679 RSI: 0000000002007fff RDI: 0000000000000005
RBP: 00007f6bcb0dc610 R08: 00007fff0bedf9c8 R09: 00007fff0bedf9c8
R10: 00007fff0bedf9c8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff0bedf9b8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c387c0 refcount:4 mapcount:0 mapping:ffff8880714c1798 index:0x2007 pfn:0x70e1f
memcg:ffff88813fe40000
aops:reiserfs_address_space_operations ino:3 dentry name:"bus"
flags: 0xfff00000002001(locked|private|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000002001 0000000000000000 dead000000000122 ffff8880714c1798
raw: 0000000000002007 ffff8880714842b8 00000004ffffffff ffff88813fe40000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Movable, gfp_mask 0x141cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_WRITE), pid 3543, tgid 3543 (syz-executor303), ts 49604686714, free_ts 12544853611
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533
 prep_new_page mm/page_alloc.c:2540 [inline]
 get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292
 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5559
 folio_alloc+0x1a/0x50 mm/mempolicy.c:2290
 filemap_alloc_folio+0xda/0x4f0 mm/filemap.c:971
 __filemap_get_folio+0x711/0xe30 mm/filemap.c:1965
 pagecache_get_page+0x28/0x250 mm/folio-compat.c:110
 reiserfs_write_begin+0x51/0x510 fs/reiserfs/inode.c:2759
 generic_cont_expand_simple+0x187/0x2a0 fs/buffer.c:2347
 reiserfs_setattr+0x606/0x11c0 fs/reiserfs/inode.c:3305
 notify_change+0xdcd/0x1080 fs/attr.c:483
 do_truncate+0x21c/0x300 fs/open.c:65
 do_sys_ftruncate+0x2e2/0x380 fs/open.c:193
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1460 [inline]
 free_pcp_prepare mm/page_alloc.c:1510 [inline]
 free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388
 free_unref_page+0x98/0x570 mm/page_alloc.c:3484
 free_contig_range+0x9a/0x150 mm/page_alloc.c:9519
 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354
 do_one_initcall+0x265/0x8f0 init/main.c:1292
 do_initcall_level+0x157/0x207 init/main.c:1365
 do_initcalls+0x49/0x86 init/main.c:1381
 kernel_init_freeable+0x473/0x61f init/main.c:1620
 kernel_init+0x19/0x290 init/main.c:1508
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

Memory state around the buggy address:
 ffff888070e1ef00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888070e1ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888070e1f000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff888070e1f080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888070e1f100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================