[Bug mi/22999] New: 'set debug lin-lwp 1' is broken with MI

["simon.marchi at ericsson dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22999

            Bug ID: 22999
           Summary: 'set debug lin-lwp 1' is broken with MI
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mi
          Assignee: unassigned at sourceware dot org
          Reporter: simon.marchi at ericsson dot com
  Target Milestone: ---

As reported here:

https://sourceware.org/ml/gdb/2018-03/msg00032.html

This crashes:

  gdb -ex "set debug lin-lwp 1" -ex start program

Our sigchld_handler wants to write some debug output using
ui_file::write_async_safe, but mi_console_file doesn't implement that method,
so it reaches the default implementation:

  virtual void write_async_safe (const char *buf, long length_buf)
  { gdb_assert_not_reached ("write_async_safe"); }

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