hpfs: filesystem error: invalid number of hotfixes: 2066844986, used: 2066844985; going on - but anything won't be destroyed because it's read-only
hpfs: filesystem error: improperly stopped
hpfs: You really don't want any checks? You are crazy...
hpfs: hpfs_map_sector(): read error
hpfs: code page support is disabled
==================================================================
BUG: KASAN: use-after-free in strcmp+0x6b/0xb0 lib/string.c:361
Read of size 1 at addr ffff888051f828a6 by task syz.3.7/4414

CPU: 0 PID: 4414 Comm: syz.3.7 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 strcmp+0x6b/0xb0 lib/string.c:361
 hpfs_get_ea+0x111/0xc80 fs/hpfs/ea.c:139
 hpfs_read_inode+0x19a/0x1000 fs/hpfs/inode.c:63
 hpfs_fill_super+0x12d1/0x1eb0 fs/hpfs/super.c:712
 mount_bdev+0x287/0x3c0 fs/super.c:1443
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632
 vfs_get_tree+0x88/0x270 fs/super.c:1573
 do_new_mount+0x24a/0xa40 fs/namespace.c:3069
 do_mount fs/namespace.c:3412 [inline]
 __do_sys_mount fs/namespace.c:3620 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3597
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f73b2f9038a
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:00007f73b3db2e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f73b3db2ef0 RCX: 00007f73b2f9038a
RDX: 000020000000a000 RSI: 0000200000000000 RDI: 00007f73b3db2eb0
RBP: 000020000000a000 R08: 00007f73b3db2ef0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f73b3db2eb0 R14: 0000000000009e15 R15: 0000200000000040
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000147e080 refcount:0 mapcount:-128 mapping:0000000000000000 index:0x1 pfn:0x51f82
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffff88813fffa8b8 ffff88813fffa8b8 0000000000000000
raw: 0000000000000001 0000000000000001 00000000ffffff7f 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 10696643144, free_ts 11482172188
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
 split_map_pages+0x277/0x4c0 mm/compaction.c:97
 isolate_freepages_range+0x3dd/0x430 mm/compaction.c:735
 alloc_contig_range+0x5ae/0x850 mm/page_alloc.c:9449
 __alloc_contig_pages mm/page_alloc.c:9472 [inline]
 alloc_contig_pages+0x396/0x490 mm/page_alloc.c:9552
 debug_vm_pgtable_alloc_huge_page+0xbf/0x10f mm/debug_vm_pgtable.c:1103
 init_args+0xb94/0xeda mm/debug_vm_pgtable.c:1226
 debug_vm_pgtable+0x56/0x37e mm/debug_vm_pgtable.c:1264
 do_one_initcall+0x214/0x7a0 init/main.c:1298
 do_initcall_level+0x137/0x1e4 init/main.c:1371
 do_initcalls+0x4b/0x8a init/main.c:1387
 kernel_init_freeable+0x3fa/0x5ac init/main.c:1626
 kernel_init+0x19/0x1b0 init/main.c:1514
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1459 [inline]
 free_pcp_prepare mm/page_alloc.c:1509 [inline]
 free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
 free_contig_range+0x9d/0x150 mm/page_alloc.c:9574
 destroy_args+0x100/0xa31 mm/debug_vm_pgtable.c:1031
 debug_vm_pgtable+0x32a/0x37e mm/debug_vm_pgtable.c:1359
 do_one_initcall+0x214/0x7a0 init/main.c:1298
 do_initcall_level+0x137/0x1e4 init/main.c:1371
 do_initcalls+0x4b/0x8a init/main.c:1387
 kernel_init_freeable+0x3fa/0x5ac init/main.c:1626
 kernel_init+0x19/0x1b0 init/main.c:1514
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff888051f82780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888051f82800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888051f82880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888051f82900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888051f82980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================