rsync sst causes donor crash

[Seppo Jaakola]

In wsrep-5.5, it can happen that rsync SST causes a crash in donor node:

0x00000036a9d2686f in __strlen_sse42 () from /lib64/libc.so.6
(gdb) bt
#0 0x00000036a9d2686f in __strlen_sse42 () from /lib64/libc.so.6
#1 0x000000000067900a in ErrConvString (yythd=0x7ef464000a40)
    at /data/opt/data/vadim/src/codership-mysql/sql/sql_error.h:514
#2 my_parse_error (yythd=0x7ef464000a40) at /data/opt/data/vadim/src/codership-mysql/sql/sql_yacc.yy:152
#3 MYSQLerror (yythd=0x7ef464000a40) at /data/opt/data/vadim/src/codership-mysql/sql/sql_yacc.yy:191
#4 MYSQLparse (yythd=0x7ef464000a40) at /data/opt/data/vadim/src/codership-mysql/sql/sql_yacc.cc:38126
#5 0x00000000005905c4 in parse_sql (thd=0x7ef464000a40, parser_state=<value optimized out>, creation_ctx=0x0)
    at /data/opt/data/vadim/src/codership-mysql/sql/sql_parse.cc:8154
#6 0x000000000059bbef in mysql_parse (thd=0x7ef464000a40, rawbuf=<value optimized out>, length=35,
    parser_state=0x7f0fc1f788b0) at /data/opt/data/vadim/src/codership-mysql/sql/sql_parse.cc:5908
#7 0x00000000006731cf in sst_disallow_writes (thd=0x7ef464000a40, yes=<value optimized out>)
    at /data/opt/data/vadim/src/codership-mysql/sql/wsrep_sst.cc:629
#8 0x0000000000673cbb in sst_donor_thread (a=0x7f0fd0282c20)
    at /data/opt/data/vadim/src/codership-mysql/sql/wsrep_sst.cc:684
#9 0x00000036aa0077e1 in start_thread () from /lib64/libpthread.so.0
#10 0x00000036a9ce68ed in clone () from /lib64/libc.so.6

[Seppo Jaakola (seppo-jaakola)]

so far could not reproduce this issue. But, parser state was not initialized in sst_disallow_writes, this isisue is fixed in push #3543