maroilles# gdb /usr/local/dovecot/sbin/dovecot dovecot.core 
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This GDB was configured as "amd64-marcel-freebsd"...
Core was generated by `dovecot'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/local/lib/libldap-2.4.so.7...done.
Loaded symbols for /usr/local/lib/libldap-2.4.so.7
Reading symbols from /usr/local/lib/liblber-2.4.so.7...done.
Loaded symbols for /usr/local/lib/liblber-2.4.so.7
Reading symbols from /usr/lib/libssl.so.5...done.
Loaded symbols for /usr/lib/libssl.so.5
Reading symbols from /lib/libcrypto.so.5...done.
Loaded symbols for /lib/libcrypto.so.5
Reading symbols from /usr/lib/librt.so.1...done.
Loaded symbols for /usr/lib/librt.so.1
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x0000000800df74a9 in realloc () from /lib/libc.so.7
(gdb) bt full
#0  0x0000000800df74a9 in realloc () from /lib/libc.so.7
No symbol table info available.
#1  0x0000000000416f1b in pool_system_realloc (pool=Variable "pool" is not available.
) at mempool-system.c:109
        __PRETTY_FUNCTION__ = "pool_system_realloc"
#2  0x00000000004141f3 in i_stream_grow_buffer (stream=0x8012f08a0, bytes=Variable "bytes" is not available.
) at istream.c:416
        old_size = 0
#3  0x00000000004142e5 in i_stream_get_buffer_space (stream=0x8012f08a0, wanted_size=Variable "wanted_size" is not available.
) at istream.c:432
        __PRETTY_FUNCTION__ = "i_stream_get_buffer_space"
#4  0x0000000000414848 in i_stream_file_read (stream=0x8012f08a0) at istream-file.c:49
        size = Variable "size" is not available.
(gdb)