linux-kernel - Re: [PATCH v1] random: block in /dev/urandom

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Date:   Tue, 22 Mar 2022 18:24:19 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        linux-arch@...r.kernel.org, Dinh Nguyen <dinguyen@...nel.org>,
        Nick Hu <nickhu@...estech.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        "David S . Miller" <davem@...emloft.net>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Michal Simek <monstr@...str.eu>,
        Borislav Petkov <bp@...en8.de>, Guo Ren <guoren@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Joshua Kinard <kumba@...too.org>,
        David Laight <David.Laight@...lab.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Eric Biggers <ebiggers@...gle.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Lennart Poettering <mzxreary@...inter.de>,
        Konstantin Ryabitsev <konstantin@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Theodore Ts'o <tytso@....edu>
Subject: Re: [PATCH v1] random: block in /dev/urandom

On Tue, Mar 22, 2022 at 08:58:20AM -0700, Guenter Roeck wrote:

> This patch (or a later version of it) made it into mainline and causes a
> large number of qemu boot test failures for various architectures (arm,
> m68k, microblaze, sparc32, xtensa are the ones I observed). Common
> denominator is that boot hangs at "Saving random seed:". A sample bisect
> log is attached. Reverting this patch fixes the problem.

Just as a datapoint for debugging at least qemu/arm is getting coverage
in CI systems (KernelCI is covering a bunch of different emulated
machines and LKFT has at least one configuration as well, clang's tests
have some wider architecture coverage as well I think) and they don't
seem to be seeing any problems - there's some other variable in there.

For example current basic boot tests for KernelCI are at:

   https://linux.kernelci.org/test/job/mainline/branch/master/kernel/v5.17-1442-gb47d5a4f6b8d/plan/baseline/

for mainline and -next has:

   https://linux.kernelci.org/test/job/next/branch/master/kernel/next-20220322/plan/baseline/

These are with a buildroot based rootfs that has a "Saving random seed: " 
step in the boot process FWIW.

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