linux-kernel - Re: Meet compiled kernel binaray abnormal issue while enabling generic kasan in kernel 6.12 with some default KBUILD

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Message-ID: <CAGSQo03DH9L7OFZsGXU8gt_4iq2zo6gZbJtw3p2hD6tGp0KTzA@mail.gmail.com>
Date: Wed, 16 Jul 2025 16:19:22 -0700
From: Matthew Maurer <mmaurer@...gle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Carlos Llamas <cmllamas@...gle.com>, 刘海燕 (Haiyan Liu) <haiyan.liu@...soc.com>, 
	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Miguel Ojeda <ojeda@...nel.org>, 
	周平 (Ping Zhou/9032) <Ping.Zhou1@...soc.com>, 
	代子为 (Ziwei Dai) <Ziwei.Dai@...soc.com>, 
	杨丽娜 (Lina Yang) <lina.yang@...soc.com>, 
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"rust-for-linux@...r.kernel.org" <rust-for-linux@...r.kernel.org>, 
	王双 (Shuang Wang) <shuang.wang@...soc.com>, 
	Andrey Ryabinin <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>, 
	Andrey Konovalov <andreyknvl@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Vincenzo Frascino <vincenzo.frascino@....com>, 
	"kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joelagnelf@...dia.com>, Christian Brauner <christian@...uner.io>, 
	Suren Baghdasaryan <surenb@...gle.com>, Jamie Cunliffe <Jamie.Cunliffe@....com>, 
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: Meet compiled kernel binaray abnormal issue while enabling
 generic kasan in kernel 6.12 with some default KBUILD_RUSTFLAGS on

The reason removing that code makes your build "work" is because it
entirely disables pointer authentication in Rust code when you remove
it. That is likely not what you want.

> > We have KASAN builds with android16-6.12 and haven't seen this issue.
> > Can you share your entire config file, so we can try to reproduce?

This - please provide the config file or instructions to reproduce the
build. Since this is an upstream avenue, ideally provide instructions
for reproducing against `linux-next`, or failing that (e.g. if it's
not broken there) against v6.12.38. The default android16-6.12 build
will work fine with ASAN. If you can't provide the entire config file
in a public context, or if you only have instructions for building it
with Kleaf + fragments, or can only reproduce with the Android tree,
please reroute this request to our bug intake system (I am pretty sure
unisoc has access) and cc myself, carlos, and Alice.