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SubjectKASAN: slab-out-of-bounds Read in corrupted (2)

syzbot found the following crash on:

HEAD commit: 156c0591 Merge tag 'linux-kselftest-5.2-rc4' of git://git...
git tree: upstream
console output:
kernel config:
dashboard link:
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:

IMPORTANT: if you fix the bug, please add the following tag to the commit:

BUG: KASAN: slab-out-of-bounds in vsnprintf+0x1727/0x19a0
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:
------------[ cut here ]------------
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
Kernel panic - not syncing: panic_on_warn set ...
Shutting down cpus with NMI
Kernel Offset: disabled

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