sysctl: free(): invalid next size (fast): 0x0804b008

Binary package hint: procps

When running the command 'sysctl net.ipv4.conf.all', glibc detects some problem with memory management:

$ sysctl net.ipv4.conf.all
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.all.mc_forwarding = 0
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 1
net.ipv4.conf.all.shared_media = 0
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.all.proxy_arp = 0
net.ipv4.conf.all.medium_id = 0
net.ipv4.conf.all.bootp_relay = 0
net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.all.tag = 0
net.ipv4.conf.all.arp_filter = 0
net.ipv4.conf.all.arp_announce = 0
net.ipv4.conf.all.arp_ignore = 0
net.ipv4.conf.all.arp_accept = 0
net.ipv4.conf.all.disable_xfrm = 0
net.ipv4.conf.all.disable_policy = 0
net.ipv4.conf.all.force_igmp_version = 0
net.ipv4.conf.all.promote_secondaries = 0
*** glibc detected *** sysctl: free(): invalid next size (fast): 0x0804b008 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7df8d65]
/lib/tls/i686/cmov/libc.so.6(cfree+0x90)[0xb7dfc800]
sysctl[0x8049105]
======= Memory map: ========
08048000-0804a000 r-xp 00000000 fe:01 16397 /sbin/sysctl
0804a000-0804b000 rw-p 00001000 fe:01 16397 /sbin/sysctl
0804b000-0806c000 rw-p 0804b000 00:00 0 [heap]
b7c00000-b7c21000 rw-p b7c00000 00:00 0
b7c21000-b7d00000 ---p b7c21000 00:00 0
b7d8e000-b7d8f000 rw-p b7d8e000 00:00 0
b7d8f000-b7ed3000 r-xp 00000000 fe:01 86310 /lib/tls/i686/cmov/libc-2.6.1.so
b7ed3000-b7ed4000 r--p 00143000 fe:01 86310 /lib/tls/i686/cmov/libc-2.6.1.so
b7ed4000-b7ed6000 rw-p 00144000 fe:01 86310 /lib/tls/i686/cmov/libc-2.6.1.so
b7ed6000-b7ed9000 rw-p b7ed6000 00:00 0
b7ed9000-b7ee5000 r-xp 00000000 fe:01 65659 /lib/libproc-3.2.7.so
b7ee5000-b7ee6000 rw-p 0000b000 fe:01 65659 /lib/libproc-3.2.7.so
b7ee6000-b7efa000 rw-p b7ee6000 00:00 0
b7efc000-b7f06000 r-xp 00000000 fe:01 65553 /lib/libgcc_s.so.1
b7f06000-b7f07000 rw-p 0000a000 fe:01 65553 /lib/libgcc_s.so.1
b7f07000-b7f08000 rw-p b7f07000 00:00 0
b7f0a000-b7f0b000 rw-p b7f0a000 00:00 0
b7f0b000-b7f25000 r-xp 00000000 fe:01 71394 /lib/ld-2.6.1.so
b7f25000-b7f27000 rw-p 00019000 fe:01 71394 /lib/ld-2.6.1.so
bfc0c000-bfc22000 rw-p bfc0c000 00:00 0 [stack]
ffffe000-fffff000 r-xp 00000000 00:00 0 [vdso]
Aborted (core dumped)

Despite the "core dumped" message, there is no core dump neither in the current directory nor in /var/crash. The 0x0804b008 number in the "invalid next size" line is the same each time I execute 'sysctl net.ipv4.conf.all'.

I'm running Ubuntu 7.10 Gutsy with latest security and recommended updates. Relevant package versions are:

procps 1:3.2.7-3ubuntu5
libc6-i686 2.6.1-1ubuntu10
libc6 2.6.1-1ubuntu10
libgcc1 1:4.2.1-5ubuntu4
linux-image-2.6.22-14-generic 2.6.22-14.51

Can anyone reproduce this problem? If not, what can I do to help you debug this?