REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
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BUG: KASAN: use-after-free in leaf_paste_in_buffer+0x739/0xca0
Write of size 408 at addr ffff8880720e7e68 by task syz-executor156/5082

CPU: 1 PID: 5082 Comm: syz-executor156 Not tainted 6.1.0-syzkaller-14587-g51094a24b85e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:306
 print_report+0x107/0x1f0 mm/kasan/report.c:417
 kasan_report+0xcd/0x100 mm/kasan/report.c:517
 kasan_check_range+0x2a7/0x2e0 mm/kasan/generic.c:189
 memcpy+0x3c/0x60 mm/kasan/shadow.c:66
 leaf_paste_in_buffer+0x739/0xca0
 leaf_copy_boundary_item+0xc76/0x20f0 fs/reiserfs/lbalance.c:199
 leaf_copy_items fs/reiserfs/lbalance.c:551 [inline]
 leaf_move_items+0xc74/0x1330 fs/reiserfs/lbalance.c:726
 leaf_shift_left+0xb7/0x420 fs/reiserfs/lbalance.c:750
 balance_leaf_paste_left_shift fs/reiserfs/do_balan.c:458 [inline]
 balance_leaf_paste_left fs/reiserfs/do_balan.c:592 [inline]
 balance_leaf_left fs/reiserfs/do_balan.c:613 [inline]
 balance_leaf+0x2f2f/0x123a0 fs/reiserfs/do_balan.c:1409
 do_balance+0x2d6/0x8d0 fs/reiserfs/do_balan.c:1888
 reiserfs_paste_into_item+0x740/0x880 fs/reiserfs/stree.c:2159
 reiserfs_get_block+0x223f/0x5180 fs/reiserfs/inode.c:1069
 __block_write_begin_int+0x54c/0x1a80 fs/buffer.c:1991
 reiserfs_write_begin+0x247/0x510 fs/reiserfs/inode.c:2775
 generic_cont_expand_simple+0x151/0x250 fs/buffer.c:2347
 reiserfs_setattr+0x642/0x1200 fs/reiserfs/inode.c:3305
 notify_change+0xe50/0x1100 fs/attr.c:482
 do_truncate+0x200/0x2f0 fs/open.c:65
 do_sys_ftruncate+0x2b0/0x350 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: 0033:0x7f19ed164e89
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe266616d8 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 00007f19ed1d3ed0 RCX: 00007f19ed164e89
RDX: 00007f19ed164e89 RSI: 0000000002007ffb RDI: 0000000000000004
RBP: 00007ffe266616e8 R08: 00007f19ed1d3e40 R09: 00007f19ed1d3e40
R10: 00000000000010f8 R11: 0000000000000246 R12: 00007ffe266616f0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea0001c839c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x720e7
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001c83a08 ffffea0001c83988 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, tgid 1 (swapper/0), ts 11676057789, free_ts 12809195847
 split_map_pages+0x25b/0x540 mm/compaction.c:97
 isolate_freepages_range+0x4ac/0x510 mm/compaction.c:735
 alloc_contig_range+0x6a9/0x980 mm/page_alloc.c:9363
 __alloc_contig_pages mm/page_alloc.c:9386 [inline]
 alloc_contig_pages+0x3c8/0x4e0 mm/page_alloc.c:9463
 debug_vm_pgtable_alloc_huge_page+0xcd/0x120 mm/debug_vm_pgtable.c:1065
 init_args+0xa3a/0xdc0 mm/debug_vm_pgtable.c:1188
 debug_vm_pgtable+0x9a/0x4a0 mm/debug_vm_pgtable.c:1226
 do_one_initcall+0x1d1/0x410 init/main.c:1306
 do_initcall_level+0x168/0x220 init/main.c:1379
 do_initcalls+0x43/0x90 init/main.c:1395
 kernel_init_freeable+0x428/0x5e0 init/main.c:1634
 kernel_init+0x19/0x2b0 init/main.c:1522
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1446 [inline]
 free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496
 free_unref_page_prepare mm/page_alloc.c:3369 [inline]
 free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464
 free_contig_range+0xa3/0x160 mm/page_alloc.c:9485
 destroy_args+0xfe/0x940 mm/debug_vm_pgtable.c:998
 debug_vm_pgtable+0x43d/0x4a0 mm/debug_vm_pgtable.c:1318
 do_one_initcall+0x1d1/0x410 init/main.c:1306
 do_initcall_level+0x168/0x220 init/main.c:1379
 do_initcalls+0x43/0x90 init/main.c:1395
 kernel_init_freeable+0x428/0x5e0 init/main.c:1634
 kernel_init+0x19/0x2b0 init/main.c:1522
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffff8880720e7d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880720e7d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8880720e7e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                                          ^
 ffff8880720e7e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8880720e7f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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