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Testing with: $ make check-read1 TESTS="gdb.asm/asm-source.exp" Exposes a testcase bug that can result in racy fails: (gdb) PASS: gdb.asm/asm-source.exp: next over foo3 return Make selected stack frame return now? (y or n) y n #0 main () at /home/pedro/gdb/mygit/src/gdb/testsuite/gdb.asm/asmsrc1.s:53 53 gdbasm_exit0 (gdb) FAIL: gdb.asm/asm-source.exp: return from foo2 (got interactive prompt) n The problem is that the "return now\?.*" regex can match partial output like this: "Make selected stack frame return no" and then we send the 'y' too early, and then the next time around we hit gdb_test_multiple's internal "got interactive prompt" regex. Also, note we match "return no" instead of "return now" because the regex is missing one quote level. gdb/testsuite/ChangeLog: 2017-11-09 Pedro Alves <palves@redhat.com> * gdb.asm/asm-source.exp ("kill" test): Match the whole query output. Fix '?' match.