[Qemu-devel] [Bug 1254672] Re: ps segfaults with qemu-arm-static

[Peter Maydell]

I suspect this is a NULL pointer access that happens in procps where it
isn't handling an error path that it's not expecting somehow (either a
syscall we're not implementing, or perhaps something like /proc not
being mounted in your chroot environment, or something about qemu's
emulation of some file in /proc isn't right). The next stage would be to
debug where exactly ps is crashing (attaching a debugger to the qemu
gdbstub is probably easiest, or good old printfs...)

-- 
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1254672

Title:
  ps segfaults with qemu-arm-static

Status in QEMU:
  New
Status in Linaro QEMU:
  New
Status in “qemu-linaro” package in Ubuntu:
  New

Bug description:
  Host: Ubuntu Precise AMD64
  Guest: Debian Testing armhf (or armel)

  After running a debootstrap for Debian testing/armhf and entering the
  chroot, simply running "ps" causes a segmentation fault.

  $ sudo qemu-debootstrap --arch=armhf testing armhf 
http://ftp.uk.debian.org/debian/
  [...]
  $ sudo chroot armhf
  # ps
  Signal 11 (SEGV) caught by ps (procps-ng version 3.3.4).
  /bin/ps:display.c:59: please report this bug

  I couldn't find a bug report for procps, which would be unusual if
  such a bug existed, so I'm assuming the bug is in qemu.

  Unfortunately trying to run debootstrap for an Ubuntu variant fails to
  find the release file.

  ps is used a lot, as you can imagine, but specifically it fails when
  trying to install some packages via "apt-get install" and no attempt
  is made to recover.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: qemu-user-static 1.0.50-2012.03-0ubuntu2.1
  ProcVersionSignature: Ubuntu 3.8.0-33.48~precise1-generic 3.8.13.11
  Uname: Linux 3.8.0-33-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Mon Nov 25 10:43:12 2013
  Dependencies:

  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 
(20130820.1)
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: qemu-linaro
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1254672/+subscriptions