hud-service crashed with signal 7 in Columbus::Trie::append()

[Jon Champagne]

Random bug. Not aware of what caused it past heavy workload.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: hud 13.10.1+14.04.20140218.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-88.8-mptcp
Uname: Linux 3.11.0-88-mptcp x86_64
NonfreeKernelModules: ufsd
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Feb 19 15:39:52 2014
ExecutablePath: /usr/lib/x86_64-linux-gnu/hud/hud-service
InstallationDate: Installed on 2014-02-12 (7 days ago)
InstallationMedia: It
ProcCmdline: /usr/lib/x86_64-linux-gnu/hud/hud-service
ProcEnviron:
 PATH=(custom, no user)
 LANGUAGE=en_CA:en
 XDG_RUNTIME_DIR=<set>
 LANG=en_CA.UTF-8
 SHELL=/bin/bash
Signal: 7
SourcePackage: hud
StacktraceTop:
 Columbus::Trie::append(char const*, int) () from /usr/lib/x86_64-linux-gnu/libcolumbus.so.1
 Columbus::Trie::addNewNode(unsigned int) () from /usr/lib/x86_64-linux-gnu/libcolumbus.so.1
 Columbus::Trie::addNewSibling(unsigned int, unsigned int, unsigned short) () from /usr/lib/x86_64-linux-gnu/libcolumbus.so.1
 Columbus::Trie::insertWord(Columbus::Word const&, unsigned int) () from /usr/lib/x86_64-linux-gnu/libcolumbus.so.1
 Columbus::WordStore::getID(Columbus::Word const&) () from /usr/lib/x86_64-linux-gnu/libcolumbus.so.1
Title: hud-service crashed with signal 7 in Columbus::Trie::append()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm bumblebee cdrom dip fuse lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 Columbus::Trie::append (this=0xdbee40, data=0x7fff352135e0 "\377\377\377\377\244\023", size=<optimized out>) at /build/buildd/libcolumbus-1.0.0+14.04.20140120/src/Trie.cc:137
 Columbus::Trie::addNewNode (this=this@entry=0xdbee40, parent=parent@entry=5028) at /build/buildd/libcolumbus-1.0.0+14.04.20140120/src/Trie.cc:149
 Columbus::Trie::addNewSibling (this=this@entry=0xdbee40, node=node@entry=5028, sibling=5912, l=<optimized out>) at /build/buildd/libcolumbus-1.0.0+14.04.20140120/src/Trie.cc:160
 Columbus::Trie::insertWord (this=0xdbee40, word=..., wordID=78) at /build/buildd/libcolumbus-1.0.0+14.04.20140120/src/Trie.cc:186
 Columbus::WordStore::getID (this=0x18e9938, w=...) at /build/buildd/libcolumbus-1.0.0+14.04.20140120/src/WordStore.cc:59

[Jussi Pakkanen (jpakkane)]

That piece of libcolumbus stores dictionary info to a mmap backed temporary file. The error happens when the system expands the size of the backing store. Signal 7 is SIGBUS so there may be some problems with the way the mmap segment is set up.

The only explanation I can think of offhand is that temp space is filled up for whatever reason and the ftruncate call succeeds but when trying to use the allocated space, the kernel decides not to give the space to us and instead kills the process with the signal.