On Sat, Apr 23, 2022 at 02:52:51AM +0200, Jason A. Donenfeld wrote: > On Wed, Mar 23, 2022 at 4:53 PM Arnd Bergmann <arnd@xxxxxxxx> wrote: > > Maybe kernelci has a virtio-rng device assigned to the machine > > and you don't? That would clearly avoid the issue here. > Indeed it's probably something like that. Or maybe they're networked > with something that has a steady stream of interrupts. I say this > because I was able to reproduce Guenter's findings using the > versatilepb machine with the versatile_defconfig config and the > versatile-pb.dtb file. Indeed this board doesn't have a cycle counter. > However, I did have success using the fallback timer and the other > patches in the jd/for-guenter branch, so at least for versatile's > nuances, I think (hope?) there's a reasonable success story here. There's no virtio-rng device being instantiated, unless qemu is doing that by default (I can't see anything in the logs that suggests it did). There is networking though. A sample command for invoking qemu for versatilepb is: qemu-system-arm -cpu arm926 -machine versatilepb -nographic -net nic,model=smc91c111,macaddr=52:54:00:12:34:58 -net user -m 256 -monitor none -dtb /var/lib/lava/dispatcher/tmp/85180/deployimages-hitd6sn_/dtb/versatile-pb.dtb -kernel /var/lib/lava/dispatcher/tmp/85180/deployimages-hitd6sn_/kernel/zImage -append "console=ttyAMA0,115200 root=/dev/ram0 debug verbose console_msg_format=syslog earlycon" -initrd /var/lib/lava/dispatcher/tmp/85180/deployimages-hitd6sn_/ramdisk/rootfs.cpio.gz -drive format=qcow2,file=/var/lib/lava/dispatcher/tmp/85180/apply-overlay-guest-l9_f_lxl/lava-guest.qcow2,media=disk,if=scsi,id=lavatest
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