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+0x6b/0xb0 lib/string.c:288
Read of size 1 at addr ffff88805b6898a6 by task syz.4.338/8031

CPU: 0 PID: 8031 Comm: syz.4.338 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 strcmp+0x6b/0xb0 lib/string.c:288
 hpfs_get_ea+0x138/0xea0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x1aa/0x1050 fs/hpfs/inode.c:63
 hpfs_fill_super+0x12f2/0x1f40 fs/hpfs/super.c:712
 mount_bdev+0x21c/0x2c0 fs/super.c:1643
 legacy_get_tree+0xea/0x180 fs/fs_context.c:662
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24a/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f53f639e0ca
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:00007f53f72e9e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f53f72e9ee0 RCX: 00007f53f639e0ca
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f53f72e9ea0
RBP: 000020000000a000 R08: 00007f53f72e9ee0 R09: 0000000003a04841
R10: 0000000003a04841 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007f53f72e9ea0 R14: 0000000000009e22 R15: 00002000000001c0
 </TASK>

The buggy address belongs to the physical page:
page:ffffea00016da240 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x5b689
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 dead000000000100 dead000000000122 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 5842, tgid 5842 (kworker/1:5), ts 203392190699, free_ts 203569337205
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
 prep_new_page mm/page_alloc.c:1589 [inline]
 get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
 folio_alloc+0x1e/0x30 mm/mempolicy.c:2289
 filemap_alloc_folio+0xdf/0x490 mm/filemap.c:1004
 __filemap_get_folio+0x3fb/0xbe0 mm/filemap.c:1962
 pagecache_get_page+0x2a/0x250 mm/folio-compat.c:99
 find_or_create_page include/linux/pagemap.h:755 [inline]
 grab_cache_page include/linux/pagemap.h:877 [inline]
 gfs2_find_jhead+0x41f/0xdc0 fs/gfs2/lops.c:538
 gfs2_recover_func+0x6cd/0x1c80 fs/gfs2/recovery.c:460
 process_one_work kernel/workqueue.c:2653 [inline]
 process_scheduled_works+0xa60/0x1600 kernel/workqueue.c:2730
 worker_thread+0xa5e/0xfe0 kernel/workqueue.c:2811
 kthread+0x2fa/0x390 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
 release_pages+0x208a/0x2300 mm/swap.c:1022
 __folio_batch_release+0x71/0xe0 mm/swap.c:1042
 folio_batch_release include/linux/pagevec.h:83 [inline]
 truncate_inode_pages_range+0x381/0xea0 mm/truncate.c:396
 inode_go_inval+0x1dc/0x2b0 fs/gfs2/glops.c:384
 gfs2_make_fs_rw+0x151/0x590 fs/gfs2/super.c:140
 gfs2_fill_super+0x1977/0x1f90 fs/gfs2/ops_fstype.c:1291
 get_tree_bdev+0x3e5/0x520 fs/super.c:1591
 gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
 vfs_get_tree+0x8c/0x280 fs/super.c:1764
 do_new_mount+0x24a/0xa40 fs/namespace.c:3386
 do_mount fs/namespace.c:3726 [inline]
 __do_sys_mount fs/namespace.c:3935 [inline]
 __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88805b689780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805b689800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88805b689880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88805b689900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88805b689980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================