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/0xc0 lib/string.c:281
Read of size 1 at addr ffff88806faa0003 by task syz.1.327/7029

CPU: 0 UID: 0 PID: 7029 Comm: syz.1.327 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 strcmp+0x6b/0xc0 lib/string.c:281
 hpfs_get_ea+0x134/0xee0 fs/hpfs/ea.c:139
 hpfs_read_inode+0x1a6/0x1050 fs/hpfs/inode.c:63
 hpfs_fill_super+0x1275/0x1f90 fs/hpfs/super.c:652
 get_tree_bdev_flags+0x431/0x4f0 fs/super.c:1693
 vfs_get_tree+0x92/0x2a0 fs/super.c:1753
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3763 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3839
 do_mount fs/namespace.c:4172 [inline]
 __do_sys_mount fs/namespace.c:4388 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4365
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f501501e0ca
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:00007f5013275e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5013275ee0 RCX: 00007f501501e0ca
RDX: 0000200000000100 RSI: 0000200000000040 RDI: 00007f5013275ea0
RBP: 0000200000000100 R08: 00007f5013275ee0 R09: 0000000003200041
R10: 0000000003200041 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f5013275ea0 R14: 0000000000009e2a R15: 00002000000000c0
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xba6 pfn:0x6faa0
flags: 0x80000000000000(node=0|zone=1)
page_type: f0(buddy)
raw: 0080000000000000 ffffea0001ba0808 ffffea00010db808 0000000000000000
raw: 0000000000000ba6 0000000000000004 00000000f0000000 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 6995, tgid 6992 (syz.3.317), ts 216638383110, free_ts 223141689678
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1866
 prep_new_page mm/page_alloc.c:1874 [inline]
 get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3953
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5296
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x3b/0x1e0 mm/mempolicy.c:2509
 shmem_alloc_folio mm/shmem.c:1909 [inline]
 shmem_alloc_and_add_folio mm/shmem.c:1951 [inline]
 shmem_get_folio_gfp+0x647/0x1ad0 mm/shmem.c:2504
 shmem_get_folio mm/shmem.c:2610 [inline]
 shmem_write_begin+0x166/0x320 mm/shmem.c:3240
 generic_perform_write+0x2af/0x8b0 mm/filemap.c:4330
 shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3415
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x629/0xba0 fs/read_write.c:688
 ksys_write+0x156/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5620 tgid 5620 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1413 [inline]
 free_unref_folios+0xd64/0x1980 mm/page_alloc.c:3018
 folios_put_refs+0x7dd/0x8f0 mm/swap.c:1047
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x52c/0x1660 mm/shmem.c:1149
 shmem_truncate_range mm/shmem.c:1277 [inline]
 shmem_evict_inode+0x289/0xae0 mm/shmem.c:1407
 evict+0x61e/0xb10 fs/inode.c:825
 __dentry_kill+0x11b/0x5c0 fs/dcache.c:724
 finish_dput+0xc9/0x480 fs/dcache.c:933
 __fput+0x6a3/0xa70 fs/file_table.c:518
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0x560 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88806fa9ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806fa9ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88806faa0000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff88806faa0080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88806faa0100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================