Re: qemu-riscv32 usermode still broken?

[Andreas K. Huettel]

Am Donnerstag, 14. September 2023, 03:22:49 CEST schrieb Andreas K. Huettel:
> > > https://lists.gnu.org/archive/html/bug-bash/2023-09/msg00119.html
> > > ^ Here I'm trying to find out more.
> > >
> > > Bash tests apparently indicate that argv[0] is overwritten, and that
> > > reading through a pipe or from /dev/tty fails or loses data.
> > >
> > > Apart from the bash testsuite failing, symptoms are as follows:
> > >
> > > * Something seems wrong in the signal handling (?):
> > 
> > If it is wrong for signal handling and for 32-bit, I guess it may be 
> > fixed by this patch
> > 
> > https://www.mail-archive.com/qemu-devel@nongnu.org/msg981238.html
> > 
> > And this patch has been merged into master branch yesterday.
> > 
> > May be you can have a try based on the master branch.
> 
> I added the patch to 8.0.3 (easier for the moment), and this did
> unfortunately *not* lead to any improvements. 

Also with the patch on top of 8.1.0 no improvement or change.

> However, in the meantime on the GNU Make tracker Alejandro Colomar
> pointed me to another detail based on my oddities [1]:
> 
> > I think [make] it's failing here:
> > 
> > <https://git.savannah.gnu.org/cgit/make.git/tree/src/job.c#n757>
> > 
> > But it's failing with ENOENT, which is not one of the documented
> > errors for wait(2):
> 
> So maybe another point to look at would be the origin of the return
> values of wait, and whether that's wired correctly for rv32...
> 
> [1] https://savannah.gnu.org/bugs/?64664

In the meantime I tried to nail down a reproducible hang in bash on this 
frankensystem with qemu's gdb interface. This also pointed towards
child handling and wait [2].

[2] https://lists.gnu.org/archive/html/bug-bash/2023-09/msg00128.html

Some time ago we already debugged that corner, and Alistair Francis
came up with a fix that improved the riscv32 situation back then [3]. 
Maybe that fix was somehow incomplete? Just speculating...

[3] https://bugs.launchpad.net/qemu/+bug/1906193


-- 
Andreas K. Hüttel
dilfridge@gentoo.org
Gentoo Linux developer
(council, toolchain, base-system, perl, libreoffice)

signature.asc
Description: This is a digitally signed message part.