stmt.close cause segv

[kamipo]

• ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin14]
• OS X 10.10.5

require 'mysql2'

client = Mysql2::Client.new(
  host: 'localhost',
  username: 'root',
  database: 'test',
)

client.query("DROP TABLE IF EXISTS t")
client.query("CREATE TABLE t (a int)")

stmt = client.prepare('SELECT * FROM t WHERE a = ?')
stmt.execute(1)

client.query("ALTER TABLE t ADD COLUMN b int")

# begin
#   stmt.execute(1)
# rescue
#   # <Mysql2::Error: The number of columns in the result set differs from the number of bound buffers. You must reset the statement, rebind the result set columns, and execute the statement again>
#   p $!
# end

stmt.close
# Segmentation fault
GC.start

[sodabrew]

Thank you for this bug report. I'm able to reproduce this, but I haven't narrowed down where it's happening.

I've just got this partial backtrace so far:

4   libmysqlclient.18.dylib             0x000000010cd19fd6 reset_stmt_handle + 19
5   ???                                 0x00007f95e515ae28 0x0 + 140281770257960