Debugging memory leak which depends on CPU topology

[Dmitry Antipov <dmantipov@xxxxxxxxx>]

Hello,

are there any hints for debugging kernel memory leak which seems
depends on CPU topology? There is a syzbot reproducer which causes
an OOM killer invocation nearly in a minute when running in a QEMU
VM with '-m 8G -smp 4,sockets=4,cores=1' but not with
'-m 8G -smp 8,sockets=4,cores=2'. To whom it may be interesting,
the one is https://syzkaller.appspot.com/text?tag=ReproC&x=10b60342980000,
and it produces an extremely high pressure on 'net_hotdata.skbuff_cache'
and 'net_hotdata.skb_small_head_cache'.

Thanks in advance,
Dmitry