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BUG: KASAN: slab-out-of-bounds in dtSplitPage+0x1bce/0x36a0
Write of size 1 at addr ffff888103691060 by task 
Write of size 1 at addr ffff888103691060 by task syz.1.2282/19617

CPU: 0 UID: 0 PID: 19617 Comm: syz.1.2282 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_address_description+0x55/0x1e0
 print_report+0x58/0x70
 kasan_report+0x117/0x150
 dtSplitPage+0x1bce/0x36a0
 dtInsert+0x1080/0x5cb0
 jfs_symlink+0x8a1/0xfb0
 vfs_symlink+0x18b/0x330
 filename_symlinkat+0x1cd/0x410
 __se_sys_symlinkat+0x4e/0x2b0
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f513659e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f51373a7028 EFLAGS: 00000246 ORIG_RAX: 000000000000010a
RAX: ffffffffffffffda RBX: 00007f5136825fa0 RCX: 00007f513659e159
RDX: 00002000000005c0 RSI: ffffffffffffff9c RDI: 0000200000000700
RBP: 00007f513663506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5136826038 R14: 00007f5136825fa0 R15: 00007ffd39d83318
 </TASK>

Allocated by task 2:
 kasan_save_track+0x3e/0x80
 __kasan_slab_alloc+0x6c/0x80
 kmem_cache_alloc_node_noprof+0x354/0x610
 alloc_vmap_area+0x21c/0x1420
 __get_vm_area_node+0x200/0x2f0
 __vmalloc_node_range_noprof+0x343/0x1540
 __vmalloc_node_noprof+0xc2/0x100
 dup_task_struct+0x2c6/0xa00
 copy_process+0x7e0/0x4400
 kernel_clone+0x2d7/0x940
 kernel_thread+0x13f/0x1b0
 kthreadd+0x4ec/0x6e0
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30

The buggy address belongs to the object at ffff888103691000
 which belongs to the cache vmap_area of size 72
The buggy address is located 24 bytes to the right of
 allocated 72-byte region [ffff888103691000, ffff888103691048)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x103691
flags: 0x17ff00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 017ff00000000000 ffff88810004ba00 dead000000000100 dead000000000122
raw: 0000000000000000 0000000200270027 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 2976672835
 post_alloc_hook+0x1f9/0x250
 get_page_from_freelist+0x2209/0x2280
 __alloc_frozen_pages_noprof+0x217/0x5a0
 allocate_slab+0x7d/0x620
 refill_objects+0x2d5/0x350
 __pcs_replace_empty_main+0x2c8/0x6c0
 kmem_cache_alloc_node_noprof+0x437/0x610
 alloc_vmap_area+0x21c/0x1420
 __get_vm_area_node+0x200/0x2f0
 vmap+0x158/0x300
 irq_init_percpu_irqstack+0x3ac/0x530
 native_kick_ap+0x2ce/0x12b0
 cpuhp_kick_ap_alive+0x197/0x230
 cpuhp_invoke_callback+0x434/0x810
 _cpu_up+0x2ce/0x5b0
 cpu_up+0x1d2/0x220
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888103690f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888103690f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888103691000: 00 00 00 00 00 00 00 00 00 fc fc fc fc 00 00 00
                                                       ^
 ffff888103691080: 00 00 00 00 00 00 fc fc fc fc 00 00 00 00 00 00
 ffff888103691100: 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00 00
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