[Bug dap/34548] New: gdb.dap/pause.exp hangs on Solaris

https://sourceware.org/bugzilla/show_bug.cgi?id=34548

            Bug ID: 34548
           Summary: gdb.dap/pause.exp hangs on Solaris
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dap
          Assignee: unassigned at sourceware dot org
          Reporter: ro at gcc dot gnu.org
  Target Milestone: ---
            Target: *-*-solaris2.11

The gdb.dap/pause.exp hangs on Solaris, stopping make check until the pause
process is killed manually, which is pretty much an annoyance.

According to the log, thelast PASS is

PASS: gdb.dap/pause.exp: pause success

followed by

Content-Length: 196

{"type": "event", "event": "module", "body": {"reason": "removed", "module":
{"id": "/usr/lib/sparcv9/ld.so.1", "name": "/usr/lib/sparcv9/ld.so.1", "path":
"/usr/lib/sparcv9/ld.so.1"}}, "seq": 15}Content-Length: 171

{"type": "event", "event": "module", "body": {"reason": "new", "module": {"id":
"/lib/64/libm.so.2", "name": "/lib/64/libm.so.2", "path":
"/lib/64/libm.so.2"}}, "seq": 16}Content-Length: 171

{"type": "event", "event": "module", "body": {"reason": "new", "module": {"id":
"/lib/64/libc.so.1", "name": "/lib/64/libc.so.1", "path":
"/lib/64/libc.so.1"}}, "seq": 17}Content-Length: 180

{"type": "event", "event": "module", "body": {"reason": "new", "module": {"id":
"/lib/sparcv9/ld.so.1", "name": "/lib/sparcv9/ld.so.1", "path":
"/lib/sparcv9/ld.so.1"}}, "seq": 18}Content-Length: 93

{"type": "event", "event": "thread", "body": {"reason": "started", "threadId":
2}, "seq": 19}Content-Length: 104
M
{"type": "event", "event": "continued", "body": {"threadId": 2,
"allThreadsContinued": true}, "seq": 20}Content-Length: 104

{"type": "event", "event": "continued", "body": {"threadId": 2,
"allThreadsContinued": true}, "seq": 21}Content-Length: 104

[... many instances of the same ...]

"type": "event", "event": "continued", "body": {"threadId": 2,
"allThreadsContinued": true}, "seq": 1160}Content-Length: 122

{"type": "event", "event": "stopped", "body": {"threadId": 2,
"allThreadsStopped": true, "reason": "signal"}, "seq": 1161}FAIL:
gdb.dap/pause.exp: stopped by pause (checking body reason)
>>> {"seq": 7, "type": "request", "command": "evaluate", "arguments": {"expression": "do_nothing()"}}
Content-Length: 106

{"type": "event", "event": "continued", "body": {"threadId": 2,
"allThreadsContinued": true}, "seq": 1162}Content-Length: 106


{"type": "event", "event": "continued", "body": {"threadId": 2,
"allThreadsContinued": true}, "seq": 1163}ERROR: tcl error
sourcinggdb.dap/pause.exp.
ERROR: tcl error code NONE
ERROR: timeout reading json header
    while executing
"error "timeout reading json header""
    (procedure "_dap_read_json" line 26)
    invoked from within
"_dap_read_json"
    (procedure "dap_read_response" line 4)
    invoked from within
"dap_read_response $command $seq"
    (procedure "dap_request_and_response" line 3)
    invoked from within
"dap_request_and_response evaluate {o expression [s do_nothing()]}"
    (file "gdb.dap/pause.exp" line 67)
    invoked from within
"sourcegdb.dap/pause.exp"
    ("uplevel" body line 1)
    invoked from within
"uplevel #0 sourcegdb.dap/pause.exp"
    invoked from within
"catch "uplevel #0 source $test_file_name" msg"
UNRESOLVED: gdb.dap/pause.exp: testcase 'gdb.dap/pause.exp' aborted due to Tcl
error
PATH: gdb.dap/pause.exp: testcase 'gdb.dap/pause.exp' aborted due to Tcl error

I've no idea if there's an easy fix.  Otherwise all we can do right now seems
to be skip the test on Solaris: having to intervene manually is a no-go.

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