loop0: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-out-of-bounds in dtCompare fs/jfs/jfs_dtree.c:3345 [inline]
BUG: KASAN: slab-out-of-bounds in dtSearch+0x1683/0x21b0 fs/jfs/jfs_dtree.c:650
Read of size 1 at addr ffff88805f3069e8 by task syz.0.377/9819

CPU: 1 UID: 0 PID: 9819 Comm: syz.0.377 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 dtCompare fs/jfs/jfs_dtree.c:3345 [inline]
 dtSearch+0x1683/0x21b0 fs/jfs/jfs_dtree.c:650
 jfs_lookup+0x1b0/0x420 fs/jfs/namei.c:1462
 lookup_one_qstr_excl+0x131/0x360 fs/namei.c:1805
 __start_dirop fs/namei.c:2925 [inline]
 start_dirop fs/namei.c:2934 [inline]
 filename_create+0x20e/0x370 fs/namei.c:4922
 filename_mkdirat+0xd2/0x520 fs/namei.c:5259
 __do_sys_mkdirat fs/namei.c:5287 [inline]
 __se_sys_mkdirat+0x35/0x150 fs/namei.c:5284
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fda4aa2ae57
Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 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:00007fda48c85e58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fda48c85ee0 RCX: 00007fda4aa2ae57
RDX: 00000000000001ff RSI: 0000200000000180 RDI: 00000000ffffff9c
RBP: 0000200000002140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000002140 R11: 0000000000000246 R12: 0000200000000180
R13: 00007fda48c85ea0 R14: 0000000000000000 R15: 0000200000002140
 </TASK>

The buggy address belongs to the object at ffff88805f306180
 which belongs to the cache jfs_ip of size 2368
The buggy address is located 2152 bytes inside of
 allocated 2368-byte region [ffff88805f306180, ffff88805f306ac0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805f3009c0 pfn:0x5f300
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff888060332c01
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff8881432d9140 dead000000000122 0000000000000000
raw: ffff88805f3009c0 00000000800d000c 00000000f5000000 ffff888060332c01
head: 0080000000000040 ffff8881432d9140 dead000000000122 0000000000000000
head: ffff88805f3009c0 00000000800d000c 00000000f5000000 ffff888060332c01
head: 0080000000000003 ffffea00017cc001 00000000ffffffff 00000000ffffffff
head: ffff88805f301000 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8129, tgid 8128 (syz.5.277), ts 264161114151, free_ts 261558439682
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x228/0x280 mm/page_alloc.c:1884
 prep_new_page mm/page_alloc.c:1892 [inline]
 get_page_from_freelist+0x28bb/0x2950 mm/page_alloc.c:3945
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5240
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab+0x86/0x3a0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xb06/0x13f0 mm/slub.c:4656
 __slab_alloc+0xc5/0x1f0 mm/slub.c:4779
 __slab_alloc_node mm/slub.c:4855 [inline]
 slab_alloc_node mm/slub.c:5251 [inline]
 kmem_cache_alloc_lru_noprof+0x103/0x6a0 mm/slub.c:5282
 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105
 alloc_inode+0x6a/0x1b0 fs/inode.c:346
 iget_locked+0x131/0x6a0 fs/inode.c:1471
 jfs_iget+0x24/0x470 fs/jfs/inode.c:29
 jfs_lookup+0x220/0x420 fs/jfs/namei.c:1470
 lookup_open fs/namei.c:4456 [inline]
 open_last_lookups fs/namei.c:4583 [inline]
 path_openat+0x11cb/0x38a0 fs/namei.c:4827
 do_file_open+0x23e/0x4a0 fs/namei.c:4859
 do_sys_openat2+0x113/0x200 fs/open.c:1366
page last free pid 6904 tgid 6904 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xfd0/0x1160 mm/page_alloc.c:2973
 discard_slab mm/slub.c:3346 [inline]
 __put_partials+0x149/0x170 mm/slub.c:3886
 __slab_free+0x2af/0x330 mm/slub.c:5956
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4953 [inline]
 slab_alloc_node mm/slub.c:5263 [inline]
 kmem_cache_alloc_noprof+0x188/0x6a0 mm/slub.c:5270
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x2e/0x250 fs/namei.c:182
 getname_flags fs/namei.c:225 [inline]
 class_filename_flags_constructor include/linux/fs.h:2541 [inline]
 user_path_at+0x2a/0x160 fs/namei.c:3611
 ksys_umount fs/namespace.c:2052 [inline]
 __do_sys_umount fs/namespace.c:2060 [inline]
 __se_sys_umount fs/namespace.c:2058 [inline]
 __x64_sys_umount+0xf6/0x170 fs/namespace.c:2058
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88805f306880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805f306900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805f306980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                          ^
 ffff88805f306a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805f306a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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