Re: [Bug 1883560] [NEW] mips linux-user builds occasionly crash randomly only to be fixed by a full clean re-build

[Cornelia Huck]

On Mon, 15 Jun 2020 15:18:48 -0000
Alex Bennée <1883560@bugs.launchpad.net> wrote:

> Public bug reported:
> 
> >From time to time I find check-tcg crashes with a one of the MIPS  
> binaries. The last time it crashed was running the test:
> 
>   ./mips64el-linux-user/qemu-mips64el ./tests/tcg/mips64el-linux-
> user/threadcount
> 
> Inevitably after some time noodling around wondering what could be
> causing this weird behaviour I wonder if it is a build issue. I wipe all
> the mips* build directories, re-run configure and re-build and voila
> problem goes away.
> 
> It seems there must be some sort of build artefact which isn't being
> properly re-generated on a build update which causes weird problems.
> Additional data point if I:
> 
>   rm -rf mips64el-linux-user
>   ../../configure
>   make
> 
> then I see failures in mip32 builds - eg:
> 
>     GEN     mipsn32el-linux-user/config-target.h
>   In file included from /home/alex/lsrc/qemu.git/linux-user/syscall_defs.h:10,
>                    from /home/alex/lsrc/qemu.git/linux-user/qemu.h:16,
>                    from /home/alex/lsrc/qemu.git/linux-user/linuxload.c:5:
>   /home/alex/lsrc/qemu.git/linux-user/mips64/syscall_nr.h:1: error: 
> unterminated #ifndef
>    #ifndef LINUX_USER_MIPS64_SYSCALL_NR_H
> 
>   make[1]: *** [/home/alex/lsrc/qemu.git/rules.mak:69: 
> linux-user/linuxload.o] Error 1
>   make[1]: *** Waiting for unfinished jobs....
> 
> which implies there is a cross dependency between different targets
> somewhere. If I executed:
> 
>   rm -rf mips*
> 
> before re-configuring and re-building then everything works again.
> 
> ** Affects: qemu
>      Importance: Undecided
>          Status: New
> 
> 
> ** Tags: build linux-user mips
> 

FWIW, this does not seem to be a mips-only issue: I'm seeing the
threadcount test fail with s390x-linux-user as well, and it also goes
away (only) if I purge the build directory, re-configure, and re-build.