Focal old
$ sudo apt install --reinstall qemu-user-static=1:4.2-3ubuntu6.18 Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded. Need to get 21.3 MB of archives. After this operation, 0 B of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 qemu-user-static amd64 1:4.2-3ubuntu6.18 [21.3 MB] Fetched 21.3 MB in 1s (16.4 MB/s) (Reading database ... 126154 files and directories currently installed.) Preparing to unpack .../qemu-user-static_1%3a4.2-3ubuntu6.18_amd64.deb ... Unpacking qemu-user-static (1:4.2-3ubuntu6.18) over (1:4.2-3ubuntu6.18) ... Setting up qemu-user-static (1:4.2-3ubuntu6.18) ... Processing triggers for man-db (2.9.1-1) ... ubuntu@f-1928075-qemuuserstatic:~$ sudo chroot /home/ubuntu/bullseye-arm64 /bin/sh /debootstrap/debootstrap --second-stage W: Failure trying to run: /sbin/ldconfig W: See //debootstrap/debootstrap.log for details ubuntu@f-1928075-qemuuserstatic:~$ tail -n 2 bullseye-arm64/debootstrap/debootstrap.log qemu: uncaught target signal 11 (Segmentation fault) - core dumped Segmentation fault (core dumped) Upgrade ubuntu@f-1928075-qemuuserstatic:~$ apt-cache policy qemu-user-static qemu-user-static: Installed: 1:4.2-3ubuntu6.18 Candidate: 1:4.2-3ubuntu6.19 Version table: 1:4.2-3ubuntu6.19 500 500 http://archive.ubuntu.com/ubuntu focal-proposed/universe amd64 Packages *** 1:4.2-3ubuntu6.18 500 500 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages 100 /var/lib/dpkg/status 1:4.2-3ubuntu6.17 500 500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages 1:4.2-3ubuntu6 500 500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages ubuntu@f-1928075-qemuuserstatic:~$ sudo apt install qemu-user-static Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be upgraded: qemu-user-static 1 upgraded, 0 newly installed, 0 to remove and 65 not upgraded. Need to get 21.3 MB of archives. After this operation, 0 B of additional disk space will be used. Get:1 http://archive.ubuntu.com/ubuntu focal-proposed/universe amd64 qemu-user-static amd64 1:4.2-3ubuntu6.19 [21.3 MB] Fetched 21.3 MB in 2s (9092 kB/s) (Reading database ... 126160 files and directories currently installed.) Preparing to unpack .../qemu-user-static_1%3a4.2-3ubuntu6.19_amd64.deb ... Unpacking qemu-user-static (1:4.2-3ubuntu6.19) over (1:4.2-3ubuntu6.18) ... Setting up qemu-user-static (1:4.2-3ubuntu6.19) ... Processing triggers for man-db (2.9.1-1) ... ubuntu@f-1928075-qemuuserstatic:~$ sudo update-binfmts --test --display qemu-aarch64 qemu-aarch64 (enabled): package = qemu-user-static type = magic offset = 0 magic = \x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00 mask = \xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff interpreter = /usr/bin/qemu-aarch64-static detector = Test with new versio ubuntu@f-1928075-qemuuserstatic:~$ sudo chroot /home/ubuntu/bullseye-arm64 /bin/sh /debootstrap/debootstrap --second-stage I: Installing core packages... W: Failure trying to run: dpkg --force-depends --install /var/cache/apt/archives/base-passwd_3.5.51_arm64.deb W: See //debootstrap/debootstrap.log for details ubuntu@f-1928075-qemuuserstatic:~$ tail -n 2 bullseye-arm64/debootstrap/debootstrap.log dpkg: error: parsing file '/var/lib/dpkg/status' near line 5 package 'dpkg': duplicate value for 'Package' field That is the good case and also a full run now completes. $ sudo rm -rf bullseye-arm64; sudo qemu-debootstrap --arch=arm64 bullseye bullseye-arm64 http://ftp.debian.org/debian I: Running command: debootstrap --arch arm64 --foreign bullseye bullseye-arm64 http://ftp.debian.org/debian W: Cannot check Release signature; keyring file not available /usr/share/keyrings/debian-archive-keyring.gpg I: Retrieving InRelease I: Retrieving Packages ... I: Configuring tasksel... I: Configuring libc-bin... I: Base system installed successfully. I can't run the docker test due to networking restrictions, but it was the same fault and the same fix - so that should be ok. If anyone else can test -proposed with docker please feel free to do so. ** Tags removed: verification-needed verification-needed-focal ** Tags added: verification-done verification-done-focal -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1749393 Title: sbrk() not working under qemu-user with a PIE-compiled binary? Status in QEMU: Fix Released Status in qemu package in Ubuntu: Fix Released Status in qemu source package in Focal: Fix Committed Bug description: [Impact] * The current space reserved can be too small and we can end up with no space at all for BRK. It can happen to any case, but is much more likely with the now common PIE binaries. * Backport the upstream fix which reserves a bit more space while loading and giving it back after interpreter and stack is loaded. [Test Plan] * On x86 run: sudo apt install -y qemu-user-static docker.io sudo docker run --rm arm64v8/debian:bullseye bash -c 'apt update && apt install -y wget' ... Running hooks in /etc/ca-certificates/update.d... done. Errors were encountered while processing: libc-bin E: Sub-process /usr/bin/dpkg returned an error code (1) Second test from bug 1928075 $ sudo qemu-debootstrap --arch=arm64 bullseye bullseye-arm64 http://ftp.debian.org/debian In the bad case this is failing like W: Failure trying to run: /sbin/ldconfig W: See //debootstrap/debootstrap.log for detail And in that log file you'll see the segfault $ tail -n 2 bullseye-arm64/debootstrap/debootstrap.log qemu: uncaught target signal 11 (Segmentation fault) - core dumped Segmentation fault (core dumped) [Where problems could occur] * Regressions would be around use-cases of linux-user that is emulation not of a system but of binaries. Commonly uses for cross-tests and cross-builds so that is the space to watch for regressions [Other Info] * n/a --- In Debian unstable, we recently switched bash to be a PIE-compiled binary (for hardening). Unfortunately this resulted in bash being broken when run under qemu-user (for all target architectures, host being amd64 for me). $ sudo chroot /srv/chroots/sid-i386/ qemu-i386-static /bin/bash bash: xmalloc: .././shell.c:1709: cannot allocate 10 bytes (0 bytes allocated) bash has its own malloc implementation based on sbrk(): https://git.savannah.gnu.org/cgit/bash.git/tree/lib/malloc/malloc.c When we disable this internal implementation and rely on glibc's malloc, then everything is fine. But it might be that glibc has a fallback when sbrk() is not working properly and it might hide the underlying problem in qemu-user. This issue has also been reported to the bash upstream author and he suggested that the issue might be in qemu-user so I'm opening a ticket here. Here's the discussion with the bash upstream author: https://lists.gnu.org/archive/html/bug-bash/2018-02/threads.html#00080 You can find the problematic bash binary in that .deb file: http://snapshot.debian.org/archive/debian/20180206T154716Z/pool/main/b/bash/bash_4.4.18-1_i386.deb The version of qemu I have been using is 2.11 (Debian package qemu- user-static version 1:2.11+dfsg-1) but I have had reports that the problem is reproducible with older versions (back to 2.8 at least). Here are the related Debian bug reports: https://bugs.debian.org/889869 https://bugs.debian.org/865599 It's worth noting that bash used to have this problem (when compiled as a PIE binary) even when run directly but then something got fixed in the kernel and now the problem only appears when run under qemu-user: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1518483 To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1749393/+subscriptions
