[Bug threads/28375] New: Cannot find user-level thread for LWP: generic error

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28375

            Bug ID: 28375
           Summary: Cannot find user-level thread for LWP: generic error
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: threads
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

With patch:
...
diff --git a/gdb/testsuite/gdb.threads/process-dies-while-detaching.exp
b/gdb/testsuite/gdb
.threads/process-dies-while-detaching.exp
index ac1aad26ec5..3b59afb2fcf 100644
--- a/gdb/testsuite/gdb.threads/process-dies-while-detaching.exp
+++ b/gdb/testsuite/gdb.threads/process-dies-while-detaching.exp
@@ -240,6 +240,7 @@ proc test_detach_watch {multi_process cmd} {
        global binfile decimal

        clean_restart ${binfile}
+       gdb_test_no_output "set can-use-hw-watchpoints 0"

        if ![runto_main] {
            fail "can't run to main"
@@ -255,14 +256,16 @@ proc test_detach_watch {multi_process cmd} {
        }

        # Set a watchpoint in the child.
-       gdb_test "watch globalvar" ".* watchpoint $decimal: globalvar"
+       gdb_test "watch globalvar" "Watchpoint $decimal: globalvar"

        # Continue to the _exit breakpoint.  This arms the watchpoint
        # registers in all threads.  Detaching will thus need to clear
        # them out, and handle the case of the thread disappearing
        # while doing that (on targets that need to detach from each
        # thread individually).
-       continue_to_exit_bp
+       with_timeout_factor 100 {
+           continue_to_exit_bp
+       }

        do_detach $multi_process $cmd "normal"
     }
...
we run into:
...
(gdb) PASS: gdb.threads/process-dies-while-detaching.exp: single-process:
continue: watchpoint: continue to breakpoint: _exit
continue^M
Continuing.^M
Cannot find user-level thread for LWP 10324: generic error^M
(gdb) FAIL: gdb.threads/process-dies-while-detaching.exp: single-process:
continue: watchpoint: continue
...

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