hpfs: filesystem error: invalid number of hotfixes: 2066844986, used: 2066844985; already mounted read-only
hpfs: filesystem error: improperly stopped
hpfs: filesystem error: warning: spare dnodes used, try chkdsk
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+0x67/0xb0 lib/string.c:361
Read of size 1 at addr ffff88804cf616a6 by task syz.3.1365/7026

CPU: 1 PID: 7026 Comm: syz.3.1365 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e 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+0x67/0xb0 lib/string.c:361
 hpfs_get_ea+0x134/0xda0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x1a6/0x1050 fs/hpfs/inode.c:63
 hpfs_fill_super+0x12ee/0x1f30 fs/hpfs/super.c:712
 mount_bdev+0x28a/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+0x247/0xa40 fs/namespace.c:3078
 do_mount fs/namespace.c:3421 [inline]
 __do_sys_mount fs/namespace.c:3629 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1f06b9f10a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1f07a7fe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1f07a7fee0 RCX: 00007f1f06b9f10a
RDX: 0000200000002280 RSI: 0000200000000040 RDI: 00007f1f07a7fea0
RBP: 0000200000002280 R08: 00007f1f07a7fee0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f1f07a7fea0 R14: 0000000000009e23 R15: 0000200000000080
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000133d840 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4cf61
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 dead000000000100 dead000000000122 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 0, migratetype Unmovable, gfp_mask 0x100cc0(GFP_USER), pid 6637, tgid 6635 (syz.2.1186), ts 203323103721, free_ts 205048429507
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
 prep_new_page mm/page_alloc.c:2567 [inline]
 get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
 __get_free_pages+0x8/0x30 mm/page_alloc.c:5708
 kasan_populate_vmalloc_pte+0x31/0xf0 mm/kasan/shadow.c:271
 apply_to_pte_range mm/memory.c:2660 [inline]
 apply_to_pmd_range mm/memory.c:2704 [inline]
 apply_to_pud_range mm/memory.c:2740 [inline]
 apply_to_p4d_range mm/memory.c:2776 [inline]
 __apply_to_page_range+0x98d/0xd10 mm/memory.c:2812
 alloc_vmap_area+0x179f/0x18d0 mm/vmalloc.c:1654
 __get_vm_area_node+0x158/0x330 mm/vmalloc.c:2513
 __vmalloc_node_range+0x357/0x1380 mm/vmalloc.c:3203
 __bpf_map_area_alloc kernel/bpf/syscall.c:334 [inline]
 bpf_map_area_alloc+0xd4/0xe0 kernel/bpf/syscall.c:341
 bloom_map_alloc+0x2a5/0x5d0 kernel/bpf/bloom_filter.c:157
 find_and_alloc_map kernel/bpf/syscall.c:133 [inline]
 map_create+0x524/0xff0 kernel/bpf/syscall.c:1149
 __sys_bpf+0x38b/0x780 kernel/bpf/syscall.c:5013
 __do_sys_bpf kernel/bpf/syscall.c:5135 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5133 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5133
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1487 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
 kasan_depopulate_vmalloc_pte+0x67/0x80 mm/kasan/shadow.c:375
 apply_to_pte_range mm/memory.c:2660 [inline]
 apply_to_pmd_range mm/memory.c:2704 [inline]
 apply_to_pud_range mm/memory.c:2740 [inline]
 apply_to_p4d_range mm/memory.c:2776 [inline]
 __apply_to_page_range+0x98d/0xd10 mm/memory.c:2812
 kasan_release_vmalloc+0x93/0xb0 mm/kasan/shadow.c:492
 __purge_vmap_area_lazy+0xf72/0x1920 mm/vmalloc.c:1782
 drain_vmap_area_work+0x3c/0xd0 mm/vmalloc.c:1811
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff88804cf61580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804cf61600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88804cf61680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88804cf61700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804cf61780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================