hpfs: filesystem error: warning: spare dnodes used, try chkdsk
hpfs: Proceeding, but your filesystem could be corrupted if you delete files or directories
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+0xa7/0xb0 lib/string.c:265
Read of size 1 at addr ffff88802b82b8a6 by task syz.5.3676/22055

CPU: 1 UID: 0 PID: 22055 Comm: syz.5.3676 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 strcmp+0xa7/0xb0 lib/string.c:265
 hpfs_get_ea+0x1fa/0xc20 fs/hpfs/ea.c:139
 hpfs_read_inode+0x706/0x11c0 fs/hpfs/inode.c:63
 hpfs_fill_super+0x121c/0x1f40 fs/hpfs/super.c:652
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1873
 vfs_get_tree+0x92/0x320 fs/super.c:1933
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount fs/namespace.c:3848 [inline]
 path_mount+0x7d0/0x24c0 fs/namespace.c:4168
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount fs/namespace.c:4374 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4374
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c62f9f3ca
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:00007f8c611f5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8c611f5ee0 RCX: 00007f8c62f9f3ca
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f8c611f5ea0
RBP: 000020000000a000 R08: 00007f8c611f5ee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007f8c611f5ea0 R14: 0000000000009e22 R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802b82b000 pfn:0x2b82b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d9eac8 ffffea0001e40ac8 0000000000000000
raw: ffff88802b82b000 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 0xcc0(GFP_KERNEL), pid 21192, tgid 21192 (syz-executor), ts 1328799732774
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 __alloc_pages_noprof mm/page_alloc.c:5471 [inline]
 alloc_pages_bulk_noprof+0x5e1/0x13c0 mm/page_alloc.c:5295
 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline]
 __kasan_populate_vmalloc+0xf0/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2145
 __get_vm_area_node+0x1ed/0x350 mm/vmalloc.c:3248
 __vmalloc_node_range_noprof+0x268/0x1420 mm/vmalloc.c:4064
 vmalloc_user_noprof+0x9e/0xe0 mm/vmalloc.c:4259
 kcov_ioctl+0x4d/0x760 kernel/kcov.c:738
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5739 tgid 5739 ts 1395098979468 stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
 kasan_depopulate_vmalloc_pte+0x5d/0x80 mm/kasan/shadow.c:484
 apply_to_pte_range mm/memory.c:3470 [inline]
 apply_to_pmd_range mm/memory.c:3514 [inline]
 apply_to_pud_range mm/memory.c:3550 [inline]
 apply_to_p4d_range mm/memory.c:3586 [inline]
 __apply_to_page_range+0xb1d/0x1520 mm/memory.c:3622
 __kasan_release_vmalloc+0xd7/0xe0 mm/kasan/shadow.c:602
 kasan_release_vmalloc include/linux/kasan.h:593 [inline]
 kasan_release_vmalloc_node mm/vmalloc.c:2306 [inline]
 purge_vmap_node+0x210/0xb40 mm/vmalloc.c:2328
 __purge_vmap_area_lazy+0x90a/0xc00 mm/vmalloc.c:2418
 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2452
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Memory state around the buggy address:
 ffff88802b82b780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802b82b800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff88802b82b880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff88802b82b900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88802b82b980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb0d/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88802b82b8a3 by task syz.5.3676/22055

CPU: 1 UID: 0 PID: 22055 Comm: syz.5.3676 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0x13d/0x4b0 mm/kasan/report.c:482
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xb0d/0xc20 fs/hpfs/ea.c:138
 hpfs_read_inode+0x706/0x11c0 fs/hpfs/inode.c:63
 hpfs_fill_super+0x121c/0x1f40 fs/hpfs/super.c:652
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1873
 vfs_get_tree+0x92/0x320 fs/super.c:1933
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3772 [inline]
 do_new_mount fs/namespace.c:3848 [inline]
 path_mount+0x7d0/0x24c0 fs/namespace.c:4168
 do_mount fs/namespace.c:4181 [inline]
 __do_sys_mount fs/namespace.c:4397 [inline]
 __se_sys_mount fs/namespace.c:4374 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4374
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8c62f9f3ca
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:00007f8c611f5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8c611f5ee0 RCX: 00007f8c62f9f3ca
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f8c611f5ea0
RBP: 000020000000a000 R08: 00007f8c611f5ee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007f8c611f5ea0 R14: 0000000000009e22 R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802b82b000 pfn:0x2b82b
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0001d9eac8 ffffea0001e40ac8 0000000000000000
raw: ffff88802b82b000 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 0xcc0(GFP_KERNEL), pid 21192, tgid 21192 (syz-executor), ts 1328799732774
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 prep_new_page mm/page_alloc.c:1879 [inline]
 get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
 __alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
 __alloc_pages_noprof mm/page_alloc.c:5471 [inline]
 alloc_pages_bulk_noprof+0x5e1/0x13c0 mm/page_alloc.c:5295
 ___alloc_pages_bulk mm/kasan/shadow.c:345 [inline]
 __kasan_populate_vmalloc_do mm/kasan/shadow.c:370 [inline]
 __kasan_populate_vmalloc+0xf0/0x210 mm/kasan/shadow.c:424
 kasan_populate_vmalloc include/linux/kasan.h:580 [inline]
 alloc_vmap_area+0x95d/0x2bb0 mm/vmalloc.c:2145
 __get_vm_area_node+0x1ed/0x350 mm/vmalloc.c:3248
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
RBP: 000020000000a000 R08: 00007f8c611f5ee0 R09: 0000000003a00041
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1873
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
 <TASK>
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
Read of size 1 at addr ffff88802b82b8a4 by task syz.5.3676/22055
RSP: 002b:00007f8c611f5e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
 kcov_ioctl+0x4d/0x760 kernel/kcov.c:738
Read of size 1 at addr ffff88802b82b8a5 by task syz.5.3676/22055
                               ^
RDX: 000020000000a000 RSI: 0000200000009ec0 RDI: 00007f8c611f5ea0
==================================================================
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xb0d/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88802b82b8a3 by task syz.5.3676/22055
Memory state around the buggy address:
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802b82b000 pfn:0x2b82b
CPU: 1 UID: 0 PID: 22055 Comm: syz.5.3676 Tainted: G    B               syzkaller #0 PREEMPT(full) 
 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xcc0(GFP_KERNEL), pid 21192, tgid 21192 (syz-executor), ts 1328799732774
 kthread+0x373/0x450 kernel/kthread.c:436
==================================================================
BUG: KASAN: use-after-free in ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
BUG: KASAN: use-after-free in next_ea fs/hpfs/hpfs_fn.h:152 [inline]
BUG: KASAN: use-after-free in hpfs_get_ea+0xae2/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff88802b82b8a4 by task syz.5.3676/22055

CPU: 1 UID: 0 PID: 22055 Comm: syz.5.3676 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
 vfs_get_tree+0x92/0x320 fs/super.c:1933
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xcc0(GFP_KERNEL), pid 21192, tgid 21192 (syz-executor), ts 1328799732774
Tainted: [B]=BAD_PAGE
 kcov_ioctl+0x4d/0x760 kernel/kcov.c:738
hpfs: hpfs_map_sector(): read error
hpfs: hpfs_map_4sectors(): unaligned read