linux-kernel - Re: [PATCH] lib/crypto: tests: Annotate worker to be on stack

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Message-ID: <b4bdb833-5fdd-48e6-989a-1d4059e9cd81@roeck-us.net>
Date: Thu, 24 Jul 2025 11:29:58 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Eric Biggers <ebiggers@...nel.org>
Cc: "Jason A . Donenfeld" <Jason@...c4.com>,
	Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lib/crypto: tests: Annotate worker to be on stack

On Thu, Jul 24, 2025 at 10:36:57AM -0700, Eric Biggers wrote:
> > 
> > Configuration file and decoded stacktrace are at
> > 
> > http://server.roeck-us.net/qemu/crypto/
> > 
> > Please let me know if you need anything else.
> 
> Thanks!  It seems the kconfig is actually unrelated; what matters is how
> the kernel is being run.  It reproduces only in QEMU with KVM disabled.
> It doesn't reproduce with KVM enabled or on bare metal.
> 
> The crashed instruction is 'vinserti128 $0x1,0x30(%rsi),%ymm8,%ymm8'.
> 
> I think it's a QEMU bug: its implementation of vinserti128 reads 32
> bytes from memory instead of 16.  I'll report it to qemu-devel once I
> have a bit more information.
> 
> It will be the second QEMU bug found by the crypto tests this month....
> https://lore.kernel.org/r/20250710052824.GA608727@sol/ was the first.
> 

Oh well :-(. Thanks for tracking it down. I'll disable this test
for the time being for x86 tests. I'll let you know if I see it
or something similar for other architectures.

Thanks,
Guenter