Followup-For: Bug #355047
Package: apt
Version: 0.6.44.2
*** Please type your report below this line ***
apt-get and apt-cache segfault at the same program location. In the case
of apt-get, update finishes with a segfault and upgrade segfaults while
reading the package list. In the apt-cache case, just doing a search
triggers the segfault.
I have recompiled the package without optimisation and without
stripping and run it through gdb and strace.
-- Debugging session follows:
$ gdb apt-cache
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This GDB was configured as i486-linux-gnu...Using host libthread_db
library /lib/tls/i686/cmov/libthread_db.so.1.
(gdb) run search apt
Starting program: /usr/bin/apt-cache search apt
Program received signal SIGSEGV, Segmentation fault.
0xa7c60ca3 in strlen () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0xa7c60ca3 in strlen () from /lib/tls/i686/cmov/libc.so.6
#1 0xa7deb5c6 in std::string::compare () from /usr/lib/libstdc++.so.6
#2 0xa7e9ea7a in std::operator!=char, std::char_traitschar,
std::allocatorchar ([EMAIL PROTECTED], __rhs=0x0)
at
/usr/lib/gcc/i486-linux-gnu/4.1.2/../../../../include/c++/4.1.2/bits/basic_string.h:2200
#3 0xa7f037d5 in debPackagesIndex::FindInCache (this=0x805b270,
[EMAIL PROTECTED]) at deb/debindexfile.cc:308
#4 0xa7ecbb30 in CheckValidity ([EMAIL PROTECTED],
Start={_M_current = 0x805c528}, End={_M_current = 0x805c55c},
OutMap=0xafb5afd8)
at pkgcachegen.cc:580
#5 0xa7ece980 in pkgMakeStatusCache ([EMAIL PROTECTED],
[EMAIL PROTECTED], OutMap=0xafb5afd8, AllowMem=true) at
pkgcachegen.cc:715
#6 0x0804d307 in main (argc=3, argv=0xafb5b094) at apt-cache.cc:1791
(gdb) frame 3
#3 0xa7f037d5 in debPackagesIndex::FindInCache (this=0x805b270,
[EMAIL PROTECTED]) at deb/debindexfile.cc:308
308 if (FileName != File.FileName())
(gdb) print FileName
$1 = {static npos = 4294967295, _M_dataplus = {std::allocatorchar =
{__gnu_cxx::new_allocatorchar = {No data fields}, No data fields},
_M_p = 0x805c884
/var/lib/apt/lists/ftp.nl.debian.org_debian_dists_unstable_main_binary-i386_Packages}}
(gdb) print File
$2 = {Owner = 0xafb5aa94, File = 0xa7f44220}
(gdb) print File.Owner
$3 = (class pkgCache *) 0xafb5aa94
(gdb) print *File.Owner
$4 = {_vptr.pkgCache = 0x805a468, CacheFile = {static npos = 4294967295,
_M_dataplus = {std::allocatorchar =
{__gnu_cxx::new_allocatorchar = {No data fields}, No data
fields}, _M_p = 0xa7e395bc }},
Map = @0x805c6c8, HeaderP = 0xa7f42000, PkgP = 0xa7f42000,
VerFileP = 0xa7f42000, PkgFileP = 0xa7f42000, VerP = 0xa7f42000,
ProvideP = 0xa7f42000, DepP = 0xa7f42000, StringItemP = 0xa7f42000,
StrP = 0xa7f42000 \230\004, VS = 0xa7f29ca4}
(gdb) print *File.File
$5 = {FileName = 0, Archive = 0, Component = 0, Version = 0, Origin = 0,
Label = 0, Architecture = 0, Site = 0, IndexType = 0, Size = 0,
Flags = 0, NextFile = 0, ID = 0, mtime = 0}
(gdb) up
#4 0xa7ecbb30 in CheckValidity ([EMAIL PROTECTED],
Start={_M_current = 0x805c528}, End={_M_current = 0x805c55c},
OutMap=0xafb5afd8)
at pkgcachegen.cc:580
580 pkgCache::PkgFileIterator File = (*Start)-FindInCache(Cache);
(gdb) frame 3
#3 0xa7f037d5 in debPackagesIndex::FindInCache (this=0x805b270,
[EMAIL PROTECTED]) at deb/debindexfile.cc:308
308 if (FileName != File.FileName())
(gdb) print *this
$6 = {pkgIndexFile = {_vptr.pkgIndexFile = 0xa7f27048, Trusted =
true}, URI = {static npos = 4294967295,
_M_dataplus = {std::allocatorchar =
{__gnu_cxx::new_allocatorchar = {No data fields}, No data fields},
_M_p = 0x805bb44 http://ftp.nl.debian.org/debian/}}, Dist =
{static npos = 4294967295,
_M_dataplus = {std::allocatorchar =
{__gnu_cxx::new_allocatorchar = {No data fields}, No data fields},
_M_p = 0x805be5c unstable}}, Section = {static npos = 4294967295,
_M_dataplus = {std::allocatorchar =
{__gnu_cxx::new_allocatorchar = {No data fields}, No data
fields}, _M_p = 0x805babc main}}}
(gdb)
-- strace output
$ strace apt-cache search apt
execve(/usr/bin/apt-cache, [apt-cache, search, apt], [/* 31 vars
*/]) = 0
uname({sys=Linux, node=bscig02, ...}) = 0
brk(0) = 0x805b000
access(/etc/ld.so.nohwcap, F_OK) = -1 ENOENT (No such file or
directory)
mmap2(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0xa7fab000
access(/etc/ld.so.preload, R_OK) = -1 ENOENT (No such file or
directory)
open(/etc/ld.so.cache, O_RDONLY) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=108031, ...}) = 0
mmap2(NULL, 108031, PROT_READ, MAP_PRIVATE, 3, 0) = 0xa7f9
close(3)= 0
access(/etc/ld.so.nohwcap, F_OK) = -1
