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

[Mark Brown]

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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