Hi! On 12/13/22 10:52, John Paul Adrian Glaubitz wrote:
You could cross-compile glibc. That's most likely what I am going to do.
For the record, here's how I am doing it. 1. Create an alpha chroot on an x86_64 host system using debootstrap on a system with qemu-user-static installed. # debootstrap --no-check-gpg --arch=alpha unstable /srv/sid-alpha-sbuild http://ftp.ports.debian.org/debian-ports (See below for schroot configuration). 2. Install cross-compiler for alpha as well as build dependencies for glibc: # apt install g++-alpha-linux-gnu # apt build-dep --arch-only glibc 3. Cross-compile glibc on x86_64 on host system: $ cd /path/to/glibc/ $ mkdir build && cd build $ ../configure --host=alpha-linux-gnu --disable-werror --prefix=/usr --disable-sanity-checks && make -j8 4. Enter alpha schroot and run the the following command from the build directory: (sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$ LD_LIBRARY_PATH=/home/glaubitz/glibc-git/build /bin/bash If the bug is present, this command will segfault: Segmentation fault Otherwise it will just spawn another bash which can be exited with "exit": (sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$ LD_LIBRARY_PATH=/home/glaubitz/glibc-git/build /bin/bash (sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$ exit (sid-alpha-sbuild)glaubitz@z6:~/glibc-git/build$ The trick is to share the glibc source directory into the schroot. This is achieved by the following two configuration files: root@z6:~> cat /etc/schroot/chroot.d/sid-alpha-sbuild [sid-alpha-sbuild] description=Debian sid chroot for alpha type=directory directory=/local_scratch/sid-alpha-sbuild profile=sbuild #aliases=sid groups=root,sbuild,glaubitz,buildd root-groups=root,sbuild,glaubitz,buildd root@z6:~> root@z6:~> cat /etc/schroot/sbuild/fstab # fstab: static file system information for chroots. # Note that the mount point will be prefixed by the chroot path # (CHROOT_PATH) # # <file system> <mount point> <type> <options> <dump> <pass> /proc /proc none rw,bind 0 0 /sys /sys none rw,bind 0 0 /dev/pts /dev/pts none rw,bind 0 0 tmpfs /dev/shm tmpfs defaults 0 0 # Mount a large scratch space for the build, so we don't use up # space on an LVM snapshot of the chroot itself. /home/glaubitz /home/glaubitz none rw,bind 0 0 root@z6:~> To bisect, just run the normal git bisect process from the and just run the test command in the emulated schroot from a second terminal. Adrian -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer `. `' Physicist `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
