150424 10:44:37 [Note] Plugin 'FEDERATED' is disabled.
150424 10:44:37 InnoDB: The InnoDB memory heap is disabled
150424 10:44:37 InnoDB: Mutexes and rw_locks use GCC atomic builtins
150424 10:44:37 InnoDB: Compressed tables use zlib 1.2.8
150424 10:44:37 InnoDB: Using Linux native AIO
150424 10:44:37 InnoDB: Initializing buffer pool, size = 80.0M
150424 10:44:37 InnoDB: Completed initialization of buffer pool
150424 10:44:37 InnoDB: highest supported file format is Barracuda.
InnoDB: The log sequence number in ibdata files does not match
InnoDB: the log sequence number in the ib_logfiles!
150424 10:44:38  InnoDB: Database was not shut down normally!
InnoDB: Starting crash recovery.
InnoDB: Reading tablespace information from the .ibd files...
InnoDB: Restoring possible half-written data pages from the doublewrite
InnoDB: buffer...
150424 10:44:45  InnoDB: Waiting for the background threads to start
150424 10:44:46 InnoDB: 5.5.43 started; log sequence number 2011740020
150424 10:44:47 [Note] /usr/sbin/mysqld: ready for connections.
Version: '5.5.43-0ubuntu0.14.10.1'  socket: '/tmp/akonadi-christoph.rnVdQK/mysql.socket'  port: 0  (Ubuntu)
150424 14:20:01 [Note] /usr/sbin/mysqld: Normal shutdown

2015-04-24 15:44:14 1772 [Note] Plugin 'FEDERATED' is disabled.
2015-04-24 15:44:14 b7353700 InnoDB: Warning: Using innodb_additional_mem_pool_size is DEPRECATED. This option may be removed in future releases, together with the option innodb_use_sys_malloc and with the InnoDB's internal memory allocator.
2015-04-24 15:44:14 1772 [Note] InnoDB: Using atomics to ref count buffer pool pages
2015-04-24 15:44:14 1772 [Note] InnoDB: The InnoDB memory heap is disabled
2015-04-24 15:44:14 1772 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2015-04-24 15:44:14 1772 [Note] InnoDB: Memory barrier is not used
2015-04-24 15:44:14 1772 [Note] InnoDB: Compressed tables use zlib 1.2.8
2015-04-24 15:44:14 1772 [Note] InnoDB: Using Linux native AIO
2015-04-24 15:44:14 1772 [Note] InnoDB: Not using CPU crc32 instructions
2015-04-24 15:44:14 1772 [Note] InnoDB: Initializing buffer pool, size = 80.0M
2015-04-24 15:44:14 1772 [Note] InnoDB: Completed initialization of buffer pool
2015-04-24 15:44:14 1772 [Note] InnoDB: Highest supported file format is Barracuda.
2015-04-24 15:44:14 1772 [Note] InnoDB: The log sequence numbers 2000136075 and 2000136075 in ibdata files do not match the log sequence number 2013835742 in the ib_logfiles!
2015-04-24 15:44:14 1772 [Note] InnoDB: Database was not shutdown normally!
2015-04-24 15:44:14 1772 [Note] InnoDB: Starting crash recovery.
2015-04-24 15:44:14 1772 [Note] InnoDB: Reading tablespace information from the .ibd files...
2015-04-24 15:44:14 1772 [Note] InnoDB: Restoring possible half-written data pages 
2015-04-24 15:44:14 1772 [Note] InnoDB: from the doublewrite buffer...
13:44:16 UTC - mysqld got signal 11 ;
This could be because you hit a bug. It is also possible that this binary
or one of the libraries it was linked against is corrupt, improperly built,
or misconfigured. This error can also be caused by malfunctioning hardware.
We will try our best to scrape up some info that will hopefully help
diagnose the problem, but since we have already crashed, 
something is definitely wrong and this may fail.

key_buffer_size=16384
read_buffer_size=131072
max_used_connections=0
max_threads=256
thread_count=0
connection_count=0
It is possible that mysqld could use up to 
key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 100483 K  bytes of memory
Hope that's ok; if not, decrease some variables in the equation.

Thread pointer: 0x0
Attempting backtrace. You can use the following information to find out
where mysqld died. If you see no messages after this, something went
terribly wrong...
stack_bottom = 0 thread_stack 0x30000
/usr/sbin/mysqld(my_print_stacktrace+0x3c)[0x84e1c3c]
/usr/sbin/mysqld(handle_fatal_signal+0x346)[0x8259d96]
[0xb7737bbc]
/usr/sbin/mysqld[0x86e7479]
/usr/sbin/mysqld[0x86e8c51]
/usr/sbin/mysqld[0x86614fd]
/usr/sbin/mysqld[0x85a6ff7]
/usr/sbin/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x3f)[0x819c25f]
/usr/sbin/mysqld[0x82e45c1]
/usr/sbin/mysqld(_Z11plugin_initPiPPci+0x7e7)[0x82eabb7]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0x912)[0x8195412]
/usr/sbin/mysqld(main+0x1b)[0x817b2ab]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xde)[0xb738872e]
/usr/sbin/mysqld[0x818a220]
The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains
information that should help you find out what is causing the crash.