mount with iocharset=utf8 to access
UFO tlock:0xffffc900028b2318
==================================================================
BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x19ca/0x2050 fs/jfs/jfs_dtree.c:785
Read of size 4 at addr ffff888077243fe0 by task syz-executor/4181

CPU: 1 PID: 4181 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 print_address_description+0x60/0x2d0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xdf/0x130 mm/kasan/report.c:451
 addressPXD fs/jfs/jfs_types.h:80 [inline]
 dtSearch+0x19ca/0x2050 fs/jfs/jfs_dtree.c:785
 dtDelete+0xe2/0x29a0 fs/jfs/jfs_dtree.c:2102
 jfs_unlink+0x299/0xa40 fs/jfs/namei.c:502
 vfs_unlink+0x385/0x600 fs/namei.c:4288
 do_unlinkat+0x382/0x6f0 fs/namei.c:4356
 __do_sys_unlink fs/namei.c:4404 [inline]
 __se_sys_unlink fs/namei.c:4402 [inline]
 __x64_sys_unlink+0x45/0x50 fs/namei.c:4402
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f39d8ff2cf7
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffd8eb37fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f39d8ff2cf7
RDX: 00007ffd8eb38010 RSI: 00007ffd8eb380a0 RDI: 00007ffd8eb380a0
RBP: 00007ffd8eb380a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000206 R12: 00007ffd8eb39190
R13: 00007f39d9077d7d R14: 000000000001a84a R15: 00007ffd8eb3a260
 </TASK>

Allocated by task 0:
(stack is not available)

The buggy address belongs to the object at ffff888077243e88
 which belongs to the cache jfs_mp of size 184
The buggy address is located 160 bytes to the right of
 184-byte region [ffff888077243e88, ffff888077243f40)
The buggy address belongs to the page:
page:ffffea0001dc90c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x77243
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000122 ffff88801da58780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x192800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4807, ts 108593128067, free_ts 108376382367
 prep_new_page mm/page_alloc.c:2426 [inline]
 get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
 alloc_slab_page mm/slub.c:1780 [inline]
 allocate_slab mm/slub.c:1917 [inline]
 new_slab+0xc0/0x4b0 mm/slub.c:1980
 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
 __slab_alloc mm/slub.c:3100 [inline]
 slab_alloc_node mm/slub.c:3191 [inline]
 slab_alloc mm/slub.c:3233 [inline]
 kmem_cache_alloc+0x195/0x290 mm/slub.c:3238
 mempool_alloc+0x18f/0x4e0 mm/mempool.c:393
 alloc_metapage fs/jfs/jfs_metapage.c:175 [inline]
 __get_metapage+0x5e8/0x1060 fs/jfs/jfs_metapage.c:652
 diReadSpecial+0x257/0x700 fs/jfs/jfs_imap.c:447
 duplicateIXtree+0x10a/0x480 fs/jfs/jfs_imap.c:2993
 diNewIAG fs/jfs/jfs_imap.c:2597 [inline]
 diAllocExt fs/jfs/jfs_imap.c:1905 [inline]
 diAllocAG+0x16a7/0x1c20 fs/jfs/jfs_imap.c:1669
 diAlloc+0x1c9/0x1910 fs/jfs/jfs_imap.c:1590
 ialloc+0x89/0x940 fs/jfs/jfs_inode.c:56
 jfs_mkdir+0x190/0xa70 fs/jfs/namei.c:225
 vfs_mkdir+0x387/0x570 fs/namei.c:4073
 do_mkdirat+0x1d7/0x5a0 fs/namei.c:4098
 __do_sys_mkdirat fs/namei.c:4113 [inline]
 __se_sys_mkdirat fs/namei.c:4111 [inline]
 __x64_sys_mkdirat+0x85/0x90 fs/namei.c:4111
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1340 [inline]
 free_pcp_prepare mm/page_alloc.c:1391 [inline]
 free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
 free_unref_page+0x94/0x280 mm/page_alloc.c:3396
 free_slab mm/slub.c:2020 [inline]
 discard_slab mm/slub.c:2026 [inline]
 __unfreeze_partials+0x1a5/0x200 mm/slub.c:2512
 put_cpu_partial+0x12d/0x190 mm/slub.c:2592
 qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
 slab_alloc_node mm/slub.c:3225 [inline]
 kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
 alloc_task_struct_node kernel/fork.c:172 [inline]
 dup_task_struct+0x57/0xb30 kernel/fork.c:895
 copy_process+0x5b3/0x3e00 kernel/fork.c:2121
 kernel_clone+0x219/0x930 kernel/fork.c:2679
 __do_sys_clone3 kernel/fork.c:2954 [inline]
 __se_sys_clone3+0x2d5/0x360 kernel/fork.c:2938
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Memory state around the buggy address:
 ffff888077243e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888077243f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888077243f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff888077244000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888077244080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================