[Bug 1818122] Re: QEMU 3.1 makes libxslt to crash on ppc64

[Thomas Huth]

QEMU, like most open source projects, relies on contributors who have
motivation, skills and available time to work on implementing particular
features. They naturally tend to focus on features that result in the
greatest benefit to their own use cases. Thus simply declaring that an
open source project, must support something won't magically make it
happen.

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Title:
  QEMU 3.1 makes libxslt to crash on ppc64

Status in QEMU:
  Incomplete

Bug description:
  Host: clean Ubuntu Disco with QEMU 3.1

  Guest: Alpine Linux edge with xmlto

  Steps to set up guest:
  curl -O 
http://dl-cdn.alpinelinux.org/alpine/edge/releases/ppc64le/netboot/vmlinuz-vanilla
  curl -O 
http://dl-cdn.alpinelinux.org/alpine/edge/releases/ppc64le/netboot/initramfs-vanilla
  qemu-system-ppc64 -m 1G -kernel vmlinuz-vanilla -initrd initramfs-vanilla 
-append "console=hvc0 ip=dhcp 
alpine_repo=http://dl-cdn.alpinelinux.org/alpine/edge/main/ 
modloop=http://dl-cdn.alpinelinux.org/alpine/edge/releases/ppc64le/netboot/modloop-vanilla";
 -device virtio-rng-pci -nographic
  This brings up an VM with an in-memory Alpine Linux.

  Steps to reproduce:
  Login as root and execute the following commands.
  apk add xmlto
  ntpd -nqp time.google.com // For TLS OCSP
  wget https://ddosolitary.org/manpage-base.xsl
  wget https://ddosolitary.org/shadowsocks-libev.xml
  xmlto -m manpage-base.xsl man shadowsocks-libev.xml
  The downloaded files are from this project: 
https://github.com/shadowsocks/shadowsocks-libev The former is directly taken 
from the "doc" directory and the latter is an intermediate build output 
generated by asciidoc from doc/shadowsocks-libev.asciidoc

  Expected behavior: The command silently succeeds producing
  shadowsocks-libev.8

  Actual behavior: 
  runtime error: file 
file:///usr/share/xml/docbook/xsl-stylesheets-1.79.1/manpages/tbl.xsl line 450 
element text
  xsltApplySequenceConstructor: A potential infinite template recursion was 
detected.
  You can adjust xsltMaxDepth (--maxdepth) in order to raise the maximum number 
of nested template calls and variables/params (currently set to 3000).
  Templates:
  #0 name process.colspan
  #1 name process.colspan
  #2 name process.colspan
  #3 name process.colspan
  #4 name process.colspan
  #5 name process.colspan
  #6 name process.colspan
  #7 name process.colspan
  #8 name process.colspan
  #9 name process.colspan
  #10 name process.colspan
  #11 name process.colspan
  #12 name process.colspan
  #13 name process.colspan
  #14 name process.colspan
  Variables:
  #0
  type
  colspan
  #1
  colspan
  #2
  type
  colspan
  #3
  colspan
  #4
  type
  colspan
  #5
  colspan
  #6
  type
  colspan
  #7
  colspan
  #8
  type
  colspan
  #9
  colspan
  #10
  type
  colspan
  #11
  colspan
  #12
  type
  colspan
  #13
  colspan
  #14
  type
  colspan
  error: file /root/shadowsocks-libev.xml
  xsltRunStylesheet : run failed

  Note:
  I tried increasing --maxdepth as suggested in the error output but that will 
result in a segfault.
  This error doesn't occur with an older QEMU (I tested QEMU 2.12 on Ubuntu 
Cosmic) or different architectures on QEMU 3.1 (I tested x86, x86_64, arm, 
aarch64, s390x). Also it didn't help to use an older Alpine Linux (I tested 
v3.8). So I think it is caused by a bug in QEMU rather than the distro/package.

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