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Bug#166306: marked as done ([libapt-pkg] apt-get segfaults on corrupt /var/cache/apt/*.bin)



Your message dated Fri, 19 Aug 2011 12:05:22 +0200
with message-id <20110819115258.GA4040@debian.org>
and subject line Re: Bug#81829: "Segmentation faulty tree" (#270147) still present in Lenny, broken /var/cache/apt/*.bin available for download
has caused the Debian Bug report #81829,
regarding [libapt-pkg] apt-get segfaults on corrupt /var/cache/apt/*.bin
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
81829: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=81829
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: apt
Version: 0.5.4

I'm using linux 2.4.18, with libc6 2.2.5-15 installed.

Here's the strace log for upgrade.

gh
execve("/usr/bin/apt-get", ["apt-get", "upgrade"], [/* 34 vars */]) = 0
uname({sys="Linux", node="lsd", ...})   = 0
brk(0)                                  = 0x806e2f8
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40013000
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=60964, ...}) = 0
old_mmap(NULL, 60964, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40014000
close(3)                                = 0
open("/usr/lib/libapt-pkg-libc6.2-3-2.so.3.2", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\220\307"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0644, st_size=880300, ...}) = 0
old_mmap(NULL, 883900, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40023000
mprotect(0x400e1000, 105660, PROT_NONE) = 0
old_mmap(0x400e1000, 106496, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xbd000) = 0x400e1000
close(3)                                = 0
open("/usr/lib/libstdc++-libc6.2-2.so.3", O_RDONLY) = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0P\233\1"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0644, st_size=288444, ...}) = 0
old_mmap(NULL, 296584, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x400fb000
mprotect(0x40131000, 75400, PROT_NONE)  = 0
old_mmap(0x40131000, 69632, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x36000) = 0x40131000
old_mmap(0x40142000, 5768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x40142000
close(3)                                = 0
open("/lib/libm.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\2007\0"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0644, st_size=129768, ...}) = 0
old_mmap(NULL, 132400, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40144000
mprotect(0x40164000, 1328, PROT_NONE)   = 0
old_mmap(0x40164000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x1f000) = 0x40164000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\204\221"..., 1024) = 1024
fstat64(3, {st_mode=S_IFREG|0755, st_size=1145456, ...}) = 0
old_mmap(NULL, 1157888, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x40165000
mprotect(0x40276000, 39680, PROT_NONE)  = 0
old_mmap(0x40276000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x111000) = 0x40276000
old_mmap(0x4027c000, 15104, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4027c000
close(3)                                = 0
munmap(0x40014000, 60964)               = 0
brk(0)                                  = 0x806e2f8
brk(0x806e318)                          = 0x806e318
brk(0x806f000)                          = 0x806f000
open("/dev/null", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0664) = 3
stat64("/var/lib/apt/.", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
brk(0x8070000)                          = 0x8070000
stat64("/etc/apt/apt.conf.d/", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
open("/dev/null", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = -1 ENOTDIR (Not a directory)
open("/etc/apt/apt.conf.d/", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 4
fstat64(4, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
brk(0x8072000)                          = 0x8072000
getdents64(0x4, 0x806f220, 0x1000, 0)   = 80
stat64("/etc/apt/apt.conf.d/70debconf", {st_mode=S_IFREG|0644, st_size=182, ...}) = 0
getdents64(0x4, 0x806f220, 0x1000, 0)   = 0
close(4)                                = 0
open("/etc/apt/apt.conf.d/70debconf", O_RDONLY|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=182, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
read(4, "// Pre-configure all packages wi"..., 4096) = 182
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x40014000, 4096)                = 0
stat64("/etc/apt/apt.conf", {st_mode=S_IFREG|0644, st_size=42, ...}) = 0
open("/etc/apt/apt.conf", O_RDONLY|O_LARGEFILE) = 4
fstat64(4, {st_mode=S_IFREG|0644, st_size=42, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
read(4, "Acquire::http::Proxy \"http://pro";..., 4096) = 42
read(4, "", 4096)                       = 0
close(4)                                = 0
munmap(0x40014000, 4096)                = 0
stat64("/var/lib/dpkg/status", {st_mode=S_IFREG|0644, st_size=1843022, ...}) = 0
stat64("/usr/bin/dpkg", {st_mode=S_IFREG|0755, st_size=158184, ...}) = 0
stat64("/etc/debian_version", {st_mode=S_IFREG|0644, st_size=17, ...}) = 0
ioctl(1, SNDCTL_TMR_TIMEBASE, 0xbffff608) = -1 ENOTTY (Inappropriate ioctl for device)
rt_sigaction(SIGPIPE, {SIG_IGN}, {SIG_DFL}, 8) = 0
rt_sigaction(SIGWINCH, {0x80632dc, [WINCH], SA_RESTART|0x4000000}, {SIG_DFL}, 8) = 0
ioctl(1, 0x5413, 0xbffff7d4)            = -1 ENOTTY (Inappropriate ioctl for device)
open("/var/lib/dpkg/lock", O_RDWR|O_CREAT|O_TRUNC, 0640) = 4
fcntl64(4, F_SETFD, FD_CLOEXEC)         = 0
fcntl64(4, F_SETLK, {type=F_WRLCK, whence=SEEK_SET, start=0, len=0}) = 0
open("/var/lib/dpkg/updates/", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 5
fstat64(5, {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
fcntl64(5, F_SETFD, FD_CLOEXEC)         = 0
getdents64(0x5, 0x806f908, 0x1000, 0x19) = 48
getdents64(0x5, 0x806f908, 0x1000, 0x19) = 0
close(5)                                = 0
stat64("/etc/apt/vendors.list.d/", 0xbffff47c) = -1 ENOENT (No such file or directory)
stat64("/etc/apt/vendors.list", 0xbffff47c) = -1 ENOENT (No such file or directory)
open("/etc/apt/sources.list", O_RDONLY|O_LARGEFILE) = 5
fstat64(5, {st_mode=S_IFREG|0644, st_size=820, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
read(5, "deb http://shakti.ath.cx/debian/";..., 4096) = 820
read(5, "", 4096)                       = 0
close(5)                                = 0
munmap(0x40014000, 4096)                = 0
access("/var/cache/apt/", W_OK)         = 0
fstat64(1, {st_mode=S_IFREG|0644, st_size=6106, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40014000
write(1, "Reading Package Lists...", 24Reading Package Lists...) = 24
stat64("/var/cache/apt/pkgcache.bin", {st_mode=S_IFREG|0644, st_size=4024291, ...}) = 0
open("/var/cache/apt/pkgcache.bin", O_RDONLY) = 5
fcntl64(5, F_SETFD, FD_CLOEXEC)         = 0
fstat64(5, {st_mode=S_IFREG|0644, st_size=4024291, ...}) = 0
old_mmap(NULL, 4024291, PROT_READ, MAP_SHARED, 5, 0) = 0x40280000
stat64("/var/lib/apt/lists/shakti.ath.cx_debian_kde3.1-beta2_._Packages", {st_mode=S_IFREG|0644, st_size=354706, ...}) = 0
stat64("/var/lib/apt/lists/shakti.ath.cx_debian_kde3.1-beta2_._Packages", {st_mode=S_IFREG|0644, st_size=354706, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_coda_debian_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8677, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_coda_debian_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8677, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8252965, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8252965, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_contrib_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=233360, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_contrib_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=233360, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=257874, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_main_dists_unstable_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=257874, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=98055, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=98055, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_contrib_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=1111, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_contrib_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=1111, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=7587, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_non-US_dists_unstable_non-US_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=7587, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_wine_dists_wine_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=7150, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_wine_dists_wine_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=7150, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_audio%5fvideo_dists_unstable_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=48303, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_audio%5fvideo_dists_unstable_main_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=48303, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_java_dists_woody_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8757, ...}) = 0
stat64("/var/lib/apt/lists/proxy:9999_java_dists_woody_non-free_binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8757, ...}) = 0
stat64("/var/lib/apt/lists/people.debian.org_%7eblade_testing_._Packages", {st_mode=S_IFREG|0644, st_size=23109, ...}) = 0
stat64("/var/lib/apt/lists/people.debian.org_%7eblade_testing_._Packages", {st_mode=S_IFREG|0644, st_size=23109, ...}) = 0
stat64("/var/lib/apt/lists/arachni.kiwi.uni-hamburg.de_%7eharlekin_._binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8524, ...}) = 0
stat64("/var/lib/apt/lists/arachni.kiwi.uni-hamburg.de_%7eharlekin_._binary-i386_Packages", {st_mode=S_IFREG|0644, st_size=8524, ...}) = 0
stat64("/var/lib/dpkg/status", {st_mode=S_IFREG|0644, st_size=1843022, ...}) = 0
close(5)                                = 0
write(1, "\n", 1
)                       = 1
old_mmap(NULL, 176128, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40657000
stat64("/etc/apt/preferences", 0xbffff08c) = -1 ENOENT (No such file or directory)
old_mmap(NULL, 348160, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x40682000
brk(0x8083000)                          = 0x8083000
write(1, "Building Dependency Tree...", 27Building Dependency Tree...) = 27
--- SIGSEGV (Segmentation fault) ---
+++ killed by SIGSEGV +++

--- End Message ---
--- Begin Message ---
Source: apt
Source-Version: 0.8.16~exp4

apt (0.8.16~exp4) experimental; urgency=low

   [ Julian Andres Klode ]
   * apt-pkg/pkgcache.h:
     - [ABI break] Add pkgCache::Header::CacheFileSize, storing the cache size
   * apt-pkg/pkgcachegen.cc:
     - Write the file size to the cache
   * apt-pkg/pkgcache.cc:
     - Check that cache is at least CacheFileSize bytes large (LP: #16467)

On Thu, Aug 18, 2011 at 04:16:05PM -0500, Jonathan Nieder wrote:
> tags 81829 - moreinfo
> quit
> 
> Axel Beckert wrote:
> 
> > I occasionally ran into this bug on Lenny, can't remember on which
> > platform, but never deterministically.
> >
> > But today I reproducibly ran into this bug with both, apt-get and
> > aptitude. Independent of what I did: aptitude; aptitude -u; aptitude
> > upgrade; apt-get upgrade, I always get the "Segmentation faulty
> > tree... 50%" ("Building dependency tree... 50%^MSegmentation fault").
> >
> > Moving /var/lib/apt/extended_states away didn't help.
> >
> > Couldn't even do an apt-get install gdb for generating a backtrace.
> >
> > Moving away pkgcache.bin and srcpkgcache.bin from /var/cache/apt/
> > finally did help (thanks to waldi for that hint), but copying them
> > back after upgrading two packages didn't reproduce the segfault --
> > they always got recreated.
> 
> Thanks!  No promises about being able to take a look soon, but I've
> downloaded them.
I closed the Launchpad bug in 0.8.16~exp4, but forgot to close that 
one. We still cannot detect invalid caches where data changes, but we
can now detect all truncated caches, and reject them.

I could have included a CRC checksum in the header of the remaining
cache, but our experience so far is that 

 (a) most (all?) of these bugs are the result of truncated cache files
 (b) checksumming the cache on opening is much slower than we want,
     especially on ARM systems (200 ms on abel.d.o, 500 ms on an N900,
     12 ms on my Intel Core i5)

That said, if future shows us cases where there are problems with
correctly-sized caches, we can still add a checksum when we break
ABI again, and enable it by default only on amd64 and other fast
architectures.

-- 
Julian Andres Klode  - Debian Developer, Ubuntu Member

See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.

Attachment: pgpUS_pqQBwMu.pgp
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