Hey Guenter, On Tue, Mar 22, 2022 at 6:56 PM Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > > On 3/22/22 10:09, Jason A. Donenfeld wrote: > > Hey Guenter, > > > > On Tue, Mar 22, 2022 at 08:58:20AM -0700, Guenter Roeck wrote: > >> On Thu, Feb 17, 2022 at 05:28:48PM +0100, Jason A. Donenfeld wrote: > >>> This topic has come up countless times, and usually doesn't go anywhere. > >>> This time I thought I'd bring it up with a slightly narrower focus, > >>> updated for some developments over the last three years: we finally can > >>> make /dev/urandom always secure, in light of the fact that our RNG is > >>> now always seeded. > >>> > >> > >> [ ... ] > >> > >> 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. > > > > As Linus said, it was worth a try, but I guess it just didn't work. For > > my own curiosity, though, do you have a link to those QEMU VMs you could > > share? I'd sort of like to poke around, and if we do ever reattempt this > > sometime down the road, it seems like understanding everything about why > > the previous time failed might be a good idea. > > > > Everything - including the various root file systems - is at > git@xxxxxxxxxx:groeck/linux-build-test.git. Look into rootfs/ for the > various boot tests. I'll be happy to provide some qemu command lines > if needed. I've been playing with a few things, and I'm wondering how close I am to making this problem go away. I just made this branch: https://git.kernel.org/pub/scm/linux/kernel/git/crng/random.git/log/?h=jd/for-guenter Any interest in setting your tests on that and seeing if it still breaks? Or, perhaps better, do you have a single script that runs all your various tests and does all the toolchain things right, so I can just point it at that tree and iterate? Jason
