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 ffff888042f748a6 by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: 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 ffff888042f748a3 by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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 ffff888042f748a4 by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xae2/0xc20 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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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+0xafa/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff888042f748a5 by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xafa/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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                               ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:265
Read of size 1 at addr ffff888042f748ab by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: 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 ffff888042f748a8 by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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 ffff888042f748a9 by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xae2/0xc20 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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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+0xafa/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff888042f748aa by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xafa/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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:265
Read of size 1 at addr ffff888042f748b0 by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                     ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: 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 ffff888042f748ad by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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 ffff888042f748ae by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xae2/0xc20 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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
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+0xafa/0xc20 fs/hpfs/ea.c:138
Read of size 1 at addr ffff888042f748af by task syz.1.1180/9604

CPU: 0 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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
 ea_valuelen fs/hpfs/hpfs_fn.h:147 [inline]
 next_ea fs/hpfs/hpfs_fn.h:152 [inline]
 hpfs_get_ea+0xafa/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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304
 alloc_pages_mpol+0x1fb/0x540 mm/mempolicy.c:2490
 folio_alloc_mpol_noprof+0x36/0x260 mm/mempolicy.c:2509
 shmem_alloc_folio+0x135/0x160 mm/shmem.c:1917
 shmem_alloc_and_add_folio+0x371/0xd40 mm/shmem.c:1959
 shmem_get_folio_gfp+0x6ad/0x1910 mm/shmem.c:2512
 shmem_get_folio mm/shmem.c:2618 [inline]
 shmem_write_begin+0x1a4/0x420 mm/shmem.c:3249
 generic_perform_write+0x292/0xa40 mm/filemap.c:4358
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3424
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5640 tgid 5640 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1406 [inline]
 free_unref_folios+0xa44/0x1710 mm/page_alloc.c:3011
 folios_put_refs+0x585/0xaa0 mm/swap.c:1057
 folio_batch_release include/linux/folio_batch.h:101 [inline]
 shmem_undo_range+0x5e5/0x1570 mm/shmem.c:1159
 shmem_truncate_range mm/shmem.c:1287 [inline]
 shmem_evict_inode+0x3a5/0xbe0 mm/shmem.c:1417
 evict+0x3c2/0xad0 fs/inode.c:825
 iput_final fs/inode.c:2019 [inline]
 iput.part.0+0x989/0x1050 fs/inode.c:2068
 iput+0x35/0x40 fs/inode.c:2034
 dentry_unlink_inode+0x284/0x470 fs/dcache.c:479
 dentry_kill+0x25d/0xc20 fs/dcache.c:826
 finish_dput fs/dcache.c:1001 [inline]
 dput.part.0+0xd7/0x240 fs/dcache.c:1042
 dput+0x1f/0x30 fs/dcache.c:1037
 __fput+0x519/0xb50 fs/file_table.c:520
 task_work_run+0x150/0x240 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:70 [inline]
 exit_to_user_mode_loop+0x1d8/0x6f0 kernel/entry/common.c:101
 __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+0x666/0x870 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff888042f74780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042f74880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                  ^
 ffff888042f74900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042f74980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
==================================================================
BUG: KASAN: use-after-free in strcmp+0xa7/0xb0 lib/string.c:265
Read of size 1 at addr ffff888042f748b5 by task syz.1.1180/9604

CPU: 1 UID: 0 PID: 9604 Comm: syz.1.1180 Tainted: G    B               syzkaller #0 PREEMPT(full) 
Tainted: [B]=BAD_PAGE
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
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:1640
 vfs_get_tree+0x92/0x320 fs/super.c:1700
 fc_mount fs/namespace.c:1198 [inline]
 do_new_mount_fc fs/namespace.c:3765 [inline]
 do_new_mount fs/namespace.c:3841 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4161
 do_mount fs/namespace.c:4174 [inline]
 __do_sys_mount fs/namespace.c:4390 [inline]
 __se_sys_mount fs/namespace.c:4367 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4367
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcf56f9f28a
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:00007fcf57dbfe58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcf57dbfee0 RCX: 00007fcf56f9f28a
RDX: 0000200000000080 RSI: 0000200000009ec0 RDI: 00007fcf57dbfea0
RBP: 0000200000000080 R08: 00007fcf57dbfee0 R09: 0000000003a00041
R10: 0000000003a00041 R11: 0000000000000246 R12: 0000200000009ec0
R13: 00007fcf57dbfea0 R14: 0000000000009e3c R15: 0000200000000000
 </TASK>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x228 pfn:0x42f74
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f0(buddy)
raw: 00fff00000000000 ffffea00019c5608 ffffea00013b0e08 0000000000000000
raw: 0000000000000228 0000000000000002 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 9517, tgid 9516 (syz.2.1161), ts 370770546370, free_ts 373939268422
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0xf48/0x3530 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x299/0x2dc0 mm/page_alloc.c:5304