Revert "[d8] Dump stack trace on d8 tests timeouts on posix systems"

This reverts commit 5592bad9.

Reason for revert:
https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux%20-%20arm64%20-%20sim%20-%20MSAN/45109/overview

Original change's description:
> [d8] Dump stack trace on d8 tests timeouts on posix systems
>
> - Add a SIGTERM handler in d8 that dupms the stack trace
> - Send SIGTERM before SIGKILL in the test runner
>
> Bug: v8:13115
> Change-Id: I75285f33caabab61ff6ae83c1fbc6faf45cf595a
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3791906
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Camillo Bruni <cbruni@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#82173}

Bug: v8:13115
Change-Id: I29f72d67036f76f93043f06841e4236864623bbe
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3805885Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Michael Achenbach <machenbach@chromium.org>
Owners-Override: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82176}

src/d8/d8.cc

@@ -70,10 +70,6 @@
 #include "src/utils/utils.h"
 #include "src/web-snapshot/web-snapshot.h"
 
-#if V8_OS_POSIX
-#include <signal.h>
-#endif  // V8_OS_POSIX
-
 #ifdef V8_FUZZILLI
 #include "src/d8/cov.h"
 #endif  // V8_FUZZILLI
@@ -5519,33 +5515,9 @@ bool HasFlagThatRequiresSharedIsolate() {
   return i::FLAG_shared_string_table || i::FLAG_harmony_struct;
 }
 
-#ifdef V8_OS_POSIX
-void d8_sigterm_handler(int signal) {
-  // Dump stacktraces when terminating d8 instances with SIGTERM.
-  // SIGKILL is not intercepted.
-  if (signal == SIGTERM) {
-    FATAL("d8: Received SIGTERM signal (likely due to a TIMEOUT)\n");
-  } else {
-    UNREACHABLE();
-  }
-}
-#endif  // V8_OS_POSIX
-
-void d8_install_sigterm_handler() {
-#ifdef V8_OS_POSIX
-  struct sigaction sa;
-  sa.sa_handler = d8_sigterm_handler;
-  sigemptyset(&sa.sa_mask);
-  if (sigaction(SIGTERM, &sa, NULL) == -1) {
-    FATAL("Could not install SIGTERM handler");
-  }
-#endif  // V8_OS_POSIX
-}
-
 }  // namespace
 
 int Shell::Main(int argc, char* argv[]) {
-  d8_install_sigterm_handler();
   v8::base::EnsureConsoleOutput();
   if (!SetOptions(argc, argv)) return 1;
 

tools/testrunner/local/command.py

@@ -200,11 +200,6 @@ class PosixCommand(BaseCommand):
 
   def _kill_process(self, process):
     # Kill the whole process group (PID == GPID after setsid).
-    # First try a soft term to allow some feedback
-    os.killpg(process.pid, signal.SIGTERM)
-    # Give the process some time to cleanly terminate.
-    time.sleep(0.1)
-    # Forcefully kill processes.
     os.killpg(process.pid, signal.SIGKILL)