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Bug#832425: apache2-bin: Apache segfault when ltrace is attached to it



Package: apache2-bin
Version: 2.4.10-10+deb8u5
Severity: normal


hello, we found that apache occasionally segfault if a ltrace is running on it.
I managed to reproduce this with default config.
A simple way to reproduce :
start apache with /usr/sbin/apache2 -X
attach a ltrace on it : ltrace -p <pid> -o <file>
do some request (I run ab -c 1 -n 100 http://hostname/)
After a few seconds, a segfault occurs.

Let me know if you need any additional information.

-- Package-specific info:

-- System Information:
Debian Release: 8.5
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages apache2-bin depends on:
ii  libapr1                  1.5.1-3
ii  libaprutil1              1.5.4-1
ii  libaprutil1-dbd-sqlite3  1.5.4-1
ii  libaprutil1-ldap         1.5.4-1
ii  libc6                    2.19-18+deb8u4
ii  libldap-2.4-2            2.4.40+dfsg-1+deb8u2
ii  liblua5.1-0              5.1.5-7.1
ii  libpcre3                 2:8.35-3.3+deb8u4
ii  libssl1.0.0              1.0.1t-1+deb8u2
ii  libxml2                  2.9.1+dfsg1-5+deb8u2
ii  perl                     5.20.2-3+deb8u5
ii  zlib1g                   1:1.2.8.dfsg-2+b1

apache2-bin recommends no packages.

Versions of packages apache2-bin suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  lynx-cur [www-browser]                           2.8.9dev1-2+deb8u1
ii  w3m [www-browser]                                0.5.3-19

Versions of packages apache2 depends on:
ii  apache2-data   2.4.10-10+deb8u5
ii  apache2-utils  2.4.10-10+deb8u5
ii  dpkg           1.17.27
ii  lsb-base       4.1+Debian13+nmu1
ii  mime-support   3.58
ii  perl           5.20.2-3+deb8u5
ii  procps         2:3.3.9-9

Versions of packages apache2 recommends:
pn  ssl-cert  <none>

Versions of packages apache2 suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  lynx-cur [www-browser]                           2.8.9dev1-2+deb8u1
ii  w3m [www-browser]                                0.5.3-19

Versions of packages apache2-bin is related to:
ii  apache2      2.4.10-10+deb8u5
ii  apache2-bin  2.4.10-10+deb8u5

-- no debconf information

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