Re: loongson2f: 2.02-beta3 hangs, caused by memory coherence fixes

[Andrei Borzenkov]

12.08.2016 21:16, Mark H Weaver пишет:
> On my Lemote YeeLoong 8101B (Loongson 2F), loading GRUB 2.02-beta3 from
> PMON hangs early before displaying any messages.  Usually the screen is
> black, but occasionally there are some non-black pixels sprayed on the
> screen.
> 
> Git bisect and followup investigation shows that the following two
> commits, which insert calls to 'grub_arch_sync_dma_caches', cause the
> problem:
> 
> * ca028db..: Vladimir Serbinenko 2016-02-23 usbtrans: Fix memory coherence 
> and use-after-free.
> * 0f076d7..: Vladimir Serbinenko 2016-02-23 ehci: Fix memory coherence
> 
> Either one of these commits is sufficient to cause the problem.
> Reverting both of them fixes it.
> 
> To be more concrete: here are the relevant commits that I tested, with
> the results in the left column.  The top two revert commits are local to
> me, of course:
> 
> [WORKS] *  (mhw)7225f8a..: Mark H Weaver 2016-08-12 Revert "usbtrans: Fix 
> memory coherence and use-after-free."
> [HANGS] * b32f5a8..: Mark H Weaver 2016-08-12 Revert "ehci: Fix memory 
> coherence"
>         *  (origin/master)c831d20..: Andrei Borzenkov 2016-07-27 at_keyboard: 
> fix numpad "0" and "." mapping
> [...]
> [HANGS] *  (tag: grub-2.02-beta3, tag: 2.02-beta3)8207874..: Vladimir 
> Serbinenko 2016-02-28 Release 2.02~beta3
>         * 102e435..: Vladimir Serbinenko 2016-02-28 
> grub_arch_sync_dma_caches: Accept volatile address
>         * 51f375d..: Leif Lindholm 2016-02-27 efidisk: Respect 
> block_io_protocol buffer alignment
> [HANGS] * ca028db..: Vladimir Serbinenko 2016-02-23 usbtrans: Fix memory 
> coherence and use-after-free.
> [HANGS] * 0f076d7..: Vladimir Serbinenko 2016-02-23 ehci: Fix memory coherence
> [WORKS] * 86ef66d..: Vladimir Serbinenko 2016-02-19 arm-uboot: Make 
> self-relocatable to allow loading at any address
> 
> For each commit tested, I built it natively within an isolated container
> using GNU Guix from a pristine git checkout, bootstrapped using
> automake-1.15 and autoconf-2.69, and built using gcc-4.9.3,
> binutils-2.25.1, and the following configure flags:
> 
>   
> CONFIG_SHELL=/gnu/store/n847hk4c1hiiyhk3z7k6kmm8dp96m7f4-bash-4.3.42/bin/bash
>   SHELL=/gnu/store/n847hk4c1hiiyhk3z7k6kmm8dp96m7f4-bash-4.3.42/bin/bash
>   --prefix=/gnu/store/4rrig6mzndi49yjg586a7nwkqkr7mc0z-grub-2.02beta2-g7225f8a
>   --enable-fast-install
>   --build=mips64el-unknown-linux-gnu
>   --disable-werror
> 
>   (although the hash components of the --prefix varied)
> 
> I've attached the complete build log for commit 7225f8a below.  If it
> would be helpful, I can provide the build outputs for any of these
> commits, or describe how to reproduce the exact same builds on your MIPS
> or Loongson-based machine using GNU Guix.
> 

Without knowing anything about MIPS - can this somehow be related?

https://lists.gnu.org/archive/html/grub-devel/2015-06/msg00060.html


>      Thanks,
>        Mark
> 
> 
> 
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