Private bug reported:

while closing mutt that had been processing a mailbox and was started
like this:

mutt -f imaps://lo...@hermes.example.org/INBOX.lists

Mutt crashed after doubly freeing memory() (according to glibc's
report). Traces attached.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: mutt 1.5.21-5ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
AssertionMessage: *** glibc detected *** mutt: double free or corruption 
(fasttop): 0x00000000057aae20 ***
CrashCounter: 1
Date: Sat Jul 21 00:09:07 2012
ExecutablePath: /usr/bin/mutt-org
ProcCmdline: mutt -f imaps://lo...@hermes.example.org/INBOX.lists
ProcCwd: /home/mandree
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 LANGUAGE=de_DE:en
Signal: 6
SourcePackage: mutt
StacktraceTop:
 __libc_message (do_abort=2, fmt=0x7f09d26ed0d0 "*** glibc detected *** %s: %s: 
0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:201
 malloc_printerr (action=3, str=0x7f09d26ed2c0 "double free or corruption 
(fasttop)", ptr=<optimized out>) at malloc.c:5007
 safe_free (ptr=<optimized out>) at ../lib.c:198
 imap_close_mailbox (ctx=0x1b9a990) at ../../imap/imap.c:1368
 mx_fastclose_mailbox (ctx=0x1b9a990) at ../mx.c:733
Title: mutt-org assert failure: *** glibc detected *** mutt: double free or 
corruption (fasttop): 0x00000000057aae20 ***
UpgradeStatus: Upgraded to precise on 2012-05-13 (68 days ago)
UserGroups: adm admin audio cdrom dialout dip disk fax floppy fuse libvirtd 
lpadmin netdev plugdev pulse pulse-access sambashare saned tape vboxusers video

** Affects: mutt (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash precise regression-release

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https://bugs.launchpad.net/bugs/1027279

Title:
  mutt corrupts memory while closing IMAP mailbox

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