Re: [PATCH v2 3/4] btrfs: Add zstd support
From: Adam Borowski
Date: Fri Jul 07 2017 - 23:07:35 EST
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" <kilobyte@xxxxxxxxxx> 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? Iâve run the script with 1, 2, and 4 cores.
> > - Which version of gcc are you using to compile the kernel? Iâm 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.
âââââââ A dumb species has no way to open a tuna can.
âââââââ A smart species invents a can opener.
âââââââ A master species delegates.