ERROR: (device loop4): txAbort: 
read_mapping_page failed!
ERROR: (device loop4): txAbort: 
==================================================================
BUG: KASAN: slab-out-of-bounds in dtInsertEntry+0xb08/0xf5c fs/jfs/jfs_dtree.c:3753
Read of size 4 at addr ffff0000f6f8c04c by task syz.4.122/5190

CPU: 0 PID: 5190 Comm: syz.4.122 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026
Call trace:
 dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 __asan_report_load4_noabort+0x2c/0x38 mm/kasan/report_generic.c:350
 dtInsertEntry+0xb08/0xf5c fs/jfs/jfs_dtree.c:3753
 dtSplitPage+0x1cf0/0x2874 fs/jfs/jfs_dtree.c:1596
 dtSplitUp fs/jfs/jfs_dtree.c:1092 [inline]
 dtInsert+0xc94/0x5720 fs/jfs/jfs_dtree.c:871
 jfs_mkdir+0x600/0x910 fs/jfs/namei.c:270
 vfs_mkdir+0x314/0x4d4 fs/namei.c:4114
 do_mkdirat+0x1b8/0x3ec fs/namei.c:4139
 __do_sys_mkdirat fs/namei.c:4154 [inline]
 __se_sys_mkdirat fs/namei.c:4152 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4152
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Allocated by task 5190:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x430 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc_lru+0x1a4/0x280 mm/slub.c:3390
 alloc_inode_sb include/linux/fs.h:3245 [inline]
 jfs_alloc_inode+0x2c/0x68 fs/jfs/super.c:105
 alloc_inode fs/inode.c:261 [inline]
 iget_locked+0x178/0x7c4 fs/inode.c:1373
 jfs_iget+0x30/0x3e4 fs/jfs/inode.c:29
 jfs_lookup+0x1c0/0x378 fs/jfs/namei.c:1469
 __lookup_slow+0x25c/0x38c fs/namei.c:1698
 lookup_slow+0x5c/0x80 fs/namei.c:1715
 walk_component+0x270/0x364 fs/namei.c:2006
 lookup_last fs/namei.c:2463 [inline]
 path_lookupat+0x13c/0x3d0 fs/namei.c:2487
 filename_lookup+0x1c4/0x480 fs/namei.c:2516
 user_path_at_empty+0x5c/0x84 fs/namei.c:2913
 user_path_at include/linux/namei.h:57 [inline]
 __do_sys_chdir fs/open.c:514 [inline]
 __se_sys_chdir fs/open.c:508 [inline]
 __arm64_sys_chdir+0xb8/0x278 fs/open.c:508
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000f6f8b780
 which belongs to the cache jfs_ip of size 2240
The buggy address is located 12 bytes to the right of
 2240-byte region [ffff0000f6f8b780, ffff0000f6f8c040)

The buggy address belongs to the physical page:
page:000000004aceabc9 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x136f88
head:000000004aceabc9 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff0000f5e72c01
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c4f32f00
raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff0000f5e72c01
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000f6f8bf00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000f6f8bf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000f6f8c000: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
                                              ^
 ffff0000f6f8c080: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
 ffff0000f6f8c100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
find_entry called with index >= next_index
read_mapping_page failed!
ERROR: (device loop4): txAbort: