On Sat, Jul 08, 2017 at 01:40:18AM +0200, Adam Borowski wrote: > On Fri, Jul 07, 2017 at 11:17:49PM +0000, Nick Terrell wrote: > > On 7/6/17, 9:32 AM, "Adam Borowski" <kilob...@angband.pl> wrote: > > > Got a reproducible crash on amd64: > > > Thanks for the bug report Adam! I'm looking into the failure, and haven't > > been able to reproduce it yet. I've built my kernel from your tree, and > > I ran your script with the kernel.tar tarball 100 times, but haven't gotten > > a failure yet. > > > I have a few questions to guide my debugging. > > > > - How many cores are you running with? I’ve run the script with 1, 2, and 4 > > cores. > > - Which version of gcc are you using to compile the kernel? I’m using > > gcc-6.2.0-5ubuntu12. > > - Are the failures always in exactly the same place, and does it fail 100% > > of the time or just regularly? > > 6 cores -- all on bare metal. gcc-7.1.0-9. > Lemme try with gcc-6, a different config or in a VM.
I've tried the following: * gcc-6, defconfig (+btrfs obviously) * gcc-7, defconfig * gcc-6, my regular config * gcc-7, my regular config * gcc-7, debug + UBSAN + etc * gcc-7, defconfig, qemu-kvm with only 1 core Every build with gcc-7 reproduces the crash, every with gcc-6 does not. -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ A dumb species has no way to open a tuna can. ⢿⡄⠘⠷⠚⠋⠀ A smart species invents a can opener. ⠈⠳⣄⠀⠀⠀⠀ A master species delegates.
