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Bug#1040981: klibc-utils: Segmentation fault while executin klibc binaries in armhf architecture under qemu-user

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On Thu, 2023-07-13 at 22:27 +0000, Thorsten Glaser wrote:
> retitle 1040981 klibc-utils: segfault executing armhf binaries under qemu-user
> thanks
> 
> Venkata.Pyla@toshiba-tsip.com dixit:
> 
> > Follow below steps to reproduce this issue
> > ```
> > $ sudo debootstrap --arch=arm bookworm arm-bookworm-rootfs/ http://deb.debian.org/debian/
> > $ sudo chroot arm-bookworm/ apt-update && apt install -y klibc-utils
> > $ sudo chroot arm-bookworm/ /usr/lib/klibc/bin/fstype --help
> > qemu: uncaught target signal 11 (Segmentation fault) - core dumped
> > Segmentation fault
> > ```
> 
> Same when just copying klibc-m13AniKHUCMUNN8mXSUhIi8CUSA.so out
> of libklibc_2.0.12-1_armhf.deb into /lib/ and extracting fstype
> from klibc-utils_2.0.12-1_armhf.deb… however it works both on a
> real-metal ARM box (amdahl.d.o) and a statically(!) linked mksh
> against klibc :/
> 
> My guess here is that it’s, as usual, the fault of qemu-user,
> which has multiple outstanding emulation bugs, some of which
> affecting klibc-built binaries especially, though this, since
> a statically linked mksh works, is probably an issue with how
> qemu-user handles .interp *shrug*
[...]

I use QEMU to test klibc changes on as many architectures as possible.
For a long time I used QEMU 3.1 with some cherry-picked bug fixes.  
All the GNU-built binaries would run successfully on that, but Clang-
built binaries for some architectures did not.

Switching klibc to the time64 kernel API forced me to update to QEMU
7.2.  This introduced regressions for shared-library executables for
armhf and riscv64.

There is some more detail on this at
<https://git.kernel.org/pub/scm/linux/kernel/git/bwh/klibc-maint.git/plain/status.md>

Ben.

-- 
Ben Hutchings
Hoare's Law of Large Problems:
   Inside every large problem is a small problem struggling to get out.

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Bug#1040981: klibc-utils: Segmentation fault while executin klibc binaries in armhf architecture under qemu-user Thorsten Glaser <tg@debian.org> - 2023-07-14 00:50 +0200
  Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Thorsten Glaser <tg@debian.org> - 2023-07-14 02:20 +0200
    Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Helge Deller <deller@gmx.de> - 2023-07-14 06:20 +0200
  Bug#1040981: klibc-utils: Segmentation fault while executin klibc binaries in armhf architecture under qemu-user Ben Hutchings <ben@decadent.org.uk> - 2023-07-14 15:30 +0200
    Bug#1040981: klibc-utils: Segmentation fault while executin klibc binaries in armhf architecture under qemu-user Michael Tokarev <mjt@tls.msk.ru> - 2023-07-14 15:40 +0200
    Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Thorsten Glaser <tg@debian.org> - 2023-07-14 20:50 +0200
      Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Michael Tokarev <mjt@tls.msk.ru> - 2023-07-14 21:40 +0200
        Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Thorsten Glaser <tg@debian.org> - 2023-07-14 22:20 +0200
          Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Michael Tokarev <mjt@tls.msk.ru> - 2023-07-14 22:30 +0200
            Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Thorsten Glaser <tg@debian.org> - 2023-07-15 00:20 +0200
              Bug#1040981: klibc-utils: segfault executing armhf binaries under qemu-user Ben Hutchings <ben@decadent.org.uk> - 2023-07-15 23:50 +0200

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