Package: debootstrap
Version: 1.0.128+nmu2
Severity: normal
Control: affects -1 xen-tools
Running "debootstrap --verbose --arch amd64
--keyring=/usr/share/keyrings/debian-archive-removed-keys.gpg wheezy
/tmp/hH11H2NR4o http://archive.debian.org/debian"; (or Debian or Ubuntu
releases older than that) on Sid/Bookworm ends up like this:
[…]
I: Extracting tar...
I: Extracting tzdata...
I: Extracting util-linux...
I: Extracting xz-utils...
I: Extracting zlib1g...
I: Installing core packages...
W: Failure trying to run: chroot "/tmp/hH11H2NR4o" dpkg --force-depends --install /var/cache/apt/archives/base-passwd_3.5.26_amd64.deb
W: See /tmp/hH11H2NR4o/debootstrap/debootstrap.log for details
Looking into /tmp/hH11H2NR4o/debootstrap/debootstrap.log I find this
dpkg segfault at the end:
[…]
2023-02-05 21:13:42 (1.72 MB/s) - '/tmp/hH11H2NR4o//var/cache/apt/archives/partial/zlib1g_1%3a1.2.7.dfsg-13_amd64.deb' saved [87392/87392]
dpkg: warning: parsing file '/var/lib/dpkg/status' near line 5 package 'dpkg':
missing description
dpkg: warning: parsing file '/var/lib/dpkg/status' near line 5 package 'dpkg':
missing architecture
Segmentation fault (core dumped)
The segfault seems to have beein in the dpkg inside the chroot, not in
debootstrap:
[1395173.551147] dpkg[17643] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffcc14c1118 ax:ffffffffff600400 si:428720 di:7ffcc14c1130
[1395173.551155] dpkg[17643]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffcc14c1118 error 15 likely on CPU 6 (core 6, socket 0)
[1395173.551160] Code: Unable to access opcode bytes at 0xffffffffff6003d6.
/tmp/hH11H2NR4o/var/lib/dpkg/status looks like this afterwards:
Package: dpkg
Status: install ok installed
Maintainer: unknown
Version: 1.16.18
This file seems to have been generated by scripts/debian-common.
Not sure if something changed in the way debootstrap generates initial
files like this, but to me this seems a regression in deboostrap
compared to Bullseye where this still worked. Could have other reasons,
though, too.
Here's end of an "strace -f" of that chrooted dpkg call:
9440 stat("/sbin/start-stop-daemon", {st_mode=S_IFREG|0755, st_size=28152, ...}) = 0
9440 open("/var/lib/dpkg/info/format", O_RDONLY) = 6
9440 fstat(6, {st_mode=S_IFREG|0644, st_size=2, ...}) = 0
9440 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbf38160000
9440 read(6, "1\n", 4096) = 2
9440 close(6) = 0
9440 munmap(0x7fbf38160000, 4096) = 0
9440 stat("/var/lib/dpkg/info/format-new", 0x7ffe47838f90) = -1 ENOENT (No such file or directory)
9440 open("/var/log/dpkg.log", O_WRONLY|O_CREAT|O_APPEND, 0666) = 6
9440 fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
9440 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fbf38160000
9440 fstat(6, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
9440 lseek(6, 0, SEEK_SET) = 0
9440 fcntl(6, F_GETFD) = 0
9440 fcntl(6, F_SETFD, FD_CLOEXEC) = 0
9440 --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0xffffffffff600400} ---
9440 +++ killed by SIGSEGV (core dumped) +++
I must admit, I currently don't see which system call caused the
segfault. Full strace log attached.
Attachment:
dpkg-segfault-inside-wheezy-chroot.xz
Description: Result of 'strace -f -o dpkg-segfault-inside-wheezy-chroot -s 65536 chroot /tmp/hH11H2NR4o dpkg --force-depends --install /var/cache/apt/archives/base-passwd_3.5.26_amd64.deb'
This issue seems to affect these Debian and Ubuntu releases: precise, oneiric, natty, maverick, lucid, karmic, jaunty, intrepid, hardy, gutsy, feisty, edgy, dapper, wheezy, squeeze, lenny, etch and sarge. As wheezy was the most recent Debian release of them, I looked into that closer as an example to what went wrong. This issue has been found by running https://github.com/xen-tools/xen-tools/blob/master/examples/release-testing on a Bookworm amd64 host with LVM as storage. It bootstraps all releases listed in https://github.com/xen-tools/xen-tools/blob/master/etc/distributions.conf without the "dont-test" tag. (Bug report written on a different host.) -- System Information: Debian Release: bookworm/sid APT prefers unstable APT policy: (990, 'unstable'), (600, 'testing'), (500, 'unstable-debug'), (500, 'buildd-unstable'), (110, 'experimental'), (1, 'experimental-debug'), (1, 'buildd-experimental') merged-usr: no Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.1.0-1-amd64 (SMP w/8 CPU threads; PREEMPT) Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /bin/dash Init: sysvinit (via /sbin/init) LSM: AppArmor: enabled Versions of packages debootstrap depends on: ii wget 1.21.3-1+b2 Versions of packages debootstrap recommends: ii arch-test 0.20-1 ii debian-archive-keyring 2021.1.1 ii gnupg 2.2.40-1 Versions of packages debootstrap suggests: ii binutils 2.40-2 pn squid-deb-proxy-client <none> ii ubuntu-archive-keyring 2020.06.17.1-1 ii ubuntu-keyring [ubuntu-archive-keyring] 2020.06.17.1-1 ii xz-utils 5.4.1-0.1 ii zstd 1.5.2+dfsg2-3 -- no debconf information