runtime: TestGdbPython fails with GDB 8.2 on FreeBSD

[paulzhol]

FreeBSD updated the binary GDB packages to 8.2. The test is now failing on the arm builder (recently updated to FreeBSD 12.0):

Example:
https://build.golang.org/log/f262478ed3c90cf506b7e45e4735624266814b61

        BEGIN info goroutines
        * 1 running  syscall.Syscall
          2 waiting  runtime.gopark
          3 waiting  runtime.gopark
          17 runnable runtime.runfinq
        END

        BEGIN goroutine 1 bt
        No such goroutine:  1
        END

    runtime-gdb_test.go:277: goroutine 1 bt failed: No such goroutine:  1
FAIL
FAIL	runtime	283.007s

[katiehockman]

Thanks for reporting. This is a duplicate of #28679. Closing this issue.