w.procps crashed with SIGSEGV in stat2proc()

[Jakuje]

Some time after system started, this appeared ...

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: procps 1:3.2.8-11ubuntu6.2
Uname: Linux 3.3.6-030306-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu17.5
Architecture: amd64
CrashCounter: 1
Date: Sun Oct 20 20:19:54 2013
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-precise-amd64-20120703-2
ExecutablePath: /usr/bin/w.procps
InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
MarkForUpload: True
ProcCmdline: w
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
SegvAnalysis:
 Segfault happened at: 0x7f71a353ebe5 <__strrchr_sse42+53>: movdqa (%r8),%xmm0
 PC (0x7f71a353ebe5) ok
 source "(%r8)" (0x00000000) not located in a known VMA region (needed readable region)!
 destination "%xmm0" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: procps
StacktraceTop:
 ?? () from /lib/libproc-3.2.8.so
 ?? () from /lib/libproc-3.2.8.so
 readproc () from /lib/libproc-3.2.8.so
 readproctab () from /lib/libproc-3.2.8.so
 ?? ()
Title: w.procps crashed with SIGSEGV in readproc()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

StacktraceTop:
 stat2proc (S=0x1 <Address 0x1 out of bounds>, P=0x1549120) at proc/readproc.c:388
 simple_readproc (PT=0x1515010, p=0x1549120) at proc/readproc.c:604
 readproc (PT=0x1515010, p=0x1549120) at proc/readproc.c:863
 readproctab (flags=74) at proc/readproc.c:1049
 main (argc=1, argv=0x7fff061a0ac8) at w.c:311

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Matthias Klose (doko)]

seen in resolute:

$ gdb /usr/bin/w
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Reading symbols from /usr/bin/w...
(No debugging symbols found in /usr/bin/w)
(gdb) run
Starting program: /usr/bin/w
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
 08:00:47 up 14 days, 17:31, 0 users, load average: 0.28, 0.48, 0.68
USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT

Program received signal SIGSEGV, Segmentation fault.
0x0000555555556d86 in ?? ()
(gdb) bt
#0 0x0000555555556d86 in ?? ()
#1 0x00007ffff7c4d575 in __libc_start_call_main (main=main@entry=0x555555556820,
    argc=argc@entry=1, argv=argv@entry=0x7fffffffe4b8) at ../sysdeps/nptl/libc_start_call_main.h:58
#2 0x00007ffff7c4d628 in __libc_start_main_impl (main=0x555555556820, argc=1,
    argv=0x7fffffffe4b8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7fffffffe4a8) at ../csu/libc-start.c:360
#3 0x0000555555557085 in ?? ()
(gdb)