title: Error: free(): invalid next size (fast):
body: <p>What is this strange error I'm getting? I'm compiling C++ using g++ on Ubuntu 10.10. It pops up randomly when I run the executable (maybe 2 times in 8 hours, with 10 compiles an hour). However, if I make clean and recompile it goes away most of the time.</p>
  
  <pre><code>*** glibc detected *** ./emailQueue.app: free(): invalid next size (fast): 0x0000000001c40270 ***
  ======= Backtrace: =========
  /lib/libc.so.6(+0x774b6)[0x7f490d95e4b6]
  /lib/libc.so.6(cfree+0x73)[0x7f490d964c83]
  ./emailQueue.app[0x401f47]
  /lib/libc.so.6(__libc_start_main+0xfe)[0x7f490d905d8e]
  ./emailQueue.app[0x401cc9]
  ======= Memory map: ========
  00400000-0040d000 r-xp 00000000 08:01 1311132                            /home/server/Projects/email/emailQueue.app
  0060d000-0060e000 r--p 0000d000 08:01 1311132                            /home/server/Projects/email/emailQueue.app
  0060e000-0060f000 rw-p 0000e000 08:01 1311132                            /home/server/Projects/email/emailQueue.app
  01c40000-01c82000 rw-p 00000000 00:00 0                                  [heap]
  7f4908000000-7f4908021000 rw-p 00000000 00:00 0 
  7f4908021000-7f490c000000 ---p 00000000 00:00 0 
  7f490ce52000-7f490ce5e000 r-xp 00000000 08:01 1051251                    /lib/libnss_files-2.12.1.so
  7f490ce5e000-7f490d05d000 ---p 0000c000 08:01 1051251                    /lib/libnss_files-2.12.1.so
  7f490d05d000-7f490d05e000 r--p 0000b000 08:01 1051251                    /lib/libnss_files-2.12.1.so
  7f490d05e000-7f490d05f000 rw-p 0000c000 08:01 1051251                    /lib/libnss_files-2.12.1.so
  7f490d05f000-7f490d075000 r-xp 00000000 08:01 1048770                    /lib/libz.so.1.2.3.4
  7f490d075000-7f490d275000 ---p 00016000 08:01 1048770                    /lib/libz.so.1.2.3.4
  7f490d275000-7f490d276000 r--p 00016000 08:01 1048770                    /lib/libz.so.1.2.3.4
  7f490d276000-7f490d277000 rw-p 00017000 08:01 1048770                    /lib/libz.so.1.2.3.4
  7f490d277000-7f490d28e000 r-xp 00000000 08:01 1051248                    /lib/libnsl-2.12.1.so
  7f490d28e000-7f490d48d000 ---p 00017000 08:01 1051248                    /lib/libnsl-2.12.1.so
  7f490d48d000-7f490d48e000 r--p 00016000 08:01 1051248                    /lib/libnsl-2.12.1.so
  7f490d48e000-7f490d48f000 rw-p 00017000 08:01 1051248                    /lib/libnsl-2.12.1.so
  7f490d48f000-7f490d491000 rw-p 00000000 00:00 0 
  7f490d491000-7f490d49a000 r-xp 00000000 08:01 1051244                    /lib/libcrypt-2.12.1.so
  7f490d49a000-7f490d69a000 ---p 00009000 08:01 1051244                    /lib/libcrypt-2.12.1.so
  7f490d69a000-7f490d69b000 r--p 00009000 08:01 1051244                    /lib/libcrypt-2.12.1.so
  7f490d69b000-7f490d69c000 rw-p 0000a000 08:01 1051244                    /lib/libcrypt-2.12.1.so
  7f490d69c000-7f490d6ca000 rw-p 00000000 00:00 0 
  7f490d6ca000-7f490d6e2000 r-xp 00000000 08:01 1051256                    /lib/libpthread-2.12.1.so
  7f490d6e2000-7f490d8e1000 ---p 00018000 08:01 1051256                    /lib/libpthread-2.12.1.so
  7f490d8e1000-7f490d8e2000 r--p 00017000 08:01 1051256                    /lib/libpthread-2.12.1.so
  7f490d8e2000-7f490d8e3000 rw-p 00018000 08:01 1051256                    /lib/libpthread-2.12.1.so
  7f490d8e3000-7f490d8e7000 rw-p 00000000 00:00 0 
  7f490d8e7000-7f490da61000 r-xp 00000000 08:01 1048743                    /lib/libc-2.12.1.so
  7f490da61000-7f490dc60000 ---p 0017a000 08:01 1048743                    /lib/libc-2.12.1.so
  7f490dc60000-7f490dc64000 r--p 00179000 08:01 1048743                    /lib/libc-2.12.1.so
  7f490dc64000-7f490dc65000 rw-p 0017d000 08:01 1048743                    /lib/libc-2.12.1.so
  7f490dc65000-7f490dc6a000 rw-p 00000000 00:00 0 
  7f490dc6a000-7f490dc7f000 r-xp 00000000 08:01 1048655                    /lib/libgcc_s.so.1
  7f490dc7f000-7f490de7e000 ---p 00015000 08:01 1048655                    /lib/libgcc_s.so.1
  7f490de7e000-7f490de7f000 r--p 00014000 08:01 1048655                    /lib/libgcc_s.so.1
  7f490de7f000-7f490de80000 rw-p 00015000 08:01 1048655                    /lib/libgcc_s.so.1
  7f490de80000-7f490df02000 r-xp 00000000 08:01 1051246                    /lib/libm-2.12.1.so
  7f490df02000-7f490e101000 ---p 00082000 08:01 1051246                    /lib/libm-2.12.1.so
  7f490e101000-7f490e102000 r--p 00081000 08:01 1051246                    /lib/libm-2.12.1.so
  7f490e102000-7f490e103000 rw-p 00082000 08:01 1051246                    /lib/libm-2.12.1.so
  7f490e103000-7f490e1eb000 r-xp 00000000 08:01 4853329                    /usr/lib/libstdc++.so.6.0.14
  7f490e1eb000-7f490e3ea000 ---p 000e8000 08:01 4853329                    /usr/lib/libstdc++.so.6.0.14
  7f490e3ea000-7f490e3f2000 r--p 000e7000 08:01 4853329                    /usr/lib/libstdc++.so.6.0.14
  7f490e3f2000-7f490e3f4000 rw-p 000ef000 08:01 4853329                    /usr/lib/libstdc++.so.6.0.14
  7f490e3f4000-7f490e409000 rw-p 00000000 00:00 0 
  7f490e409000-7f490e5c7000 r-xp 00000000 08:01 4851315                    /usr/lib/libmysqlclient.so.16.0.0
  7f490e5c7000-7f490e7c7000 ---p 001be000 08:01 4851315                    /usr/lib/libmysqlclient.so.16.0.0
  7f490e7c7000-7f490e7cc000 r--p 001be000 08:01 4851315                    /usr/lib/libmysqlclient.so.16.0.0
  7f490e7cc000-7f490e816000 rw-p 001c3000 08:01 4851315                    /usr/lib/libmysqlclient.so.16.0.0
  7f490e816000-7f490e817000 rw-p 00000000 00:00 0 
  7f490e817000-7f490e837000 r-xp 00000000 08:01 1048597                    /lib/ld-2.12.1.so
  7f490ea15000-7f490ea1c000 rw-p 00000000 00:00 0 
  7f490ea33000-7f490ea37000 rw-p 00000000 00:00 0 
  7f490ea37000-7f490ea38000 r--p 00020000 08:01 1048597                    /lib/ld-2.12.1.so
  7f490ea38000-7f490ea39000 rw-p 00021000 08:01 1048597                    /lib/ld-2.12.1.so
  7f490ea39000-7f490ea3a000 rw-p 00000000 00:00 0 
  7fffb85b9000-7fffb85da000 rw-p 00000000 00:00 0                          [stack]
  7fffb85ff000-7fffb8600000 r-xp 00000000 00:00 0                          [vdso]
  ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0                  [vsyscall]
  Aborted
  </code></pre>