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BUG: KASAN: slab-out-of-bounds in vsnprintf+0x1727/0x19a0 lib/vsprintf.c:2503
Read of size 8 at addr ffff8880a91c7d00 by task syz-executor.0/9821

CPU: 0 PID: 9821 Comm: syz-executor.0 Not tainted 5.2.0-rc3+ #13
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:

Allocated by task 1024:
(stack is not available)

Freed by task 2310999008:
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Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected to SLAB object 'skbuff_head_cache' (offset 24, size 1)!
WARNING: CPU: 0 PID: 9821 at mm/usercopy.c:78 usercopy_warn+0xeb/0x110 mm/usercopy.c:78
Kernel panic - not syncing: panic_on_warn set ...
Shutting down cpus with NMI
Kernel Offset: disabled