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Re: [PATCH v2 3/4] btrfs: Add zstd support

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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@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.

-- 
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⢿⡄⠘⠷⠚⠋⠀ A smart species invents a can opener.
⠈⠳⣄⠀⠀⠀⠀ A master species delegates.

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Re: [PATCH v2 3/4] btrfs: Add zstd support Adam Borowski <kilobyte@angband.pl> - 2017-07-06 18:40 +0200
  Re: [PATCH v2 3/4] btrfs: Add zstd support Nick Terrell <terrelln@fb.com> - 2017-07-08 01:20 +0200
    Re: [PATCH v2 3/4] btrfs: Add zstd support Adam Borowski <kilobyte@angband.pl> - 2017-07-08 01:50 +0200
      Re: [PATCH v2 3/4] btrfs: Add zstd support Adam Borowski <kilobyte@angband.pl> - 2017-07-08 05:10 +0200
        Re: [PATCH v2 3/4] btrfs: Add zstd support "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2017-07-10 14:40 +0200
          Re: [PATCH v2 3/4] btrfs: Add zstd support Nick Terrell <terrelln@fb.com> - 2017-07-10 23:00 +0200
          Re: [PATCH v2 3/4] btrfs: Add zstd support Nick Terrell <terrelln@fb.com> - 2017-07-11 07:00 +0200
            Re: [PATCH v2 3/4] btrfs: Add zstd support Nick Terrell <terrelln@fb.com> - 2017-07-11 08:10 +0200
              Re: [PATCH v2 3/4] btrfs: Add zstd support Adam Borowski <kilobyte@angband.pl> - 2017-07-12 05:40 +0200

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