Dear Petr,
After a sudden power outage I can't connect to my DB anymore.
Here are the last 20 lines of mysql.err
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 = 0x0 thread_stack 0x48400
/usr/sbin/mysqld(my_print_stacktrace+0x2e)[0x55a2ffe8936e]
/usr/sbin/mysqld(handle_fatal_signal+0x3bd)[0x55a2ff9cea4d]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x110c0)[0x7f2e460b20c0]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xcf)[0x7f2e449acfcf]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x16a)[0x7f2e449ae3fa]
/usr/sbin/mysqld(+0x9d4653)[0x55a2ffe00653]
/usr/sbin/mysqld(+0x87c280)[0x55a2ffca8280]
/usr/sbin/mysqld(+0x90ac0e)[0x55a2ffd36c0e]
/usr/sbin/mysqld(+0x8214ef)[0x55a2ffc4d4ef]
/usr/sbin/mysqld(_Z24ha_initialize_handlertonP13st_plugin_int+0x66)[0x55a2ff9d0b86]
/usr/sbin/mysqld(+0x422e55)[0x55a2ff84ee55]
/usr/sbin/mysqld(_Z11plugin_initPiPPci+0x7da)[0x55a2ff85048a]
/usr/sbin/mysqld(+0x37afa3)[0x55a2ff7a6fa3]
/usr/sbin/mysqld(_Z11mysqld_mainiPPc+0x1a0d)[0x55a2ff7aa78d]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf1)[0x7f2e4499a2b1]
/usr/sbin/mysqld(_start+0x2a)[0x55a2ff79ec4a]
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.

Thanks & 73