lib/PublicInbox/DS.pm         | 4 ++--
 lib/PublicInbox/Gcf2Client.pm | 8 ++++++--
 lib/PublicInbox/Git.pm        | 3 ++-

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 01c9abd4baded2fa7b336398bb98e73417d8392b..4f1558c7c07a36c392c723fbc7c56c5a14608af8 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -624,10 +624,10 @@ 		my $ret = waitpid($pid, 0);
 		if ($ret == $pid) {
 			if ($cb) {
 				eval { $cb->($arg, $pid) };
-				warn "E: dwaitpid($pid) !in_loop: $@" if $@;
+				carp "E: dwaitpid($pid) !in_loop: $@" if $@;
 			}
 		} else {
-			warn "waitpid($pid, 0) = $ret, \$!=$!, \$?=$?";
+			carp "waitpid($pid, 0) = $ret, \$!=$!, \$?=$?";
 		}
 	}
 }
diff --git a/lib/PublicInbox/Gcf2Client.pm b/lib/PublicInbox/Gcf2Client.pm
index 10820852b21d02761a49048b1dc31e8bc9f597cd..54957cf38621ec21e90b4cdb747b8ee2c109119f 100644
--- a/lib/PublicInbox/Gcf2Client.pm
+++ b/lib/PublicInbox/Gcf2Client.pm
@@ -15,6 +15,7 @@ #	async_cat => GitAsyncCat ref (read-only pipe)
 #	sock => writable pipe to Gcf2::loop
 #	in => pipe we read from
 #	pid => PID of Gcf2::loop process
+#	owner_pid => process which spawned {pid}
 sub new  {
 	my ($rdr) = @_;
 	my $self = bless {}, __PACKAGE__;
@@ -25,6 +26,7 @@ 	pipe($out_r, $out_w) or die "pipe failed: $!";
 	$rdr //= {};
 	$rdr->{0} = $out_r;
 	my $cmd = [$^X, qw[-MPublicInbox::Gcf2 -e PublicInbox::Gcf2::loop()]];
+	$self->{owner_pid} = $$;
 	@$self{qw(in pid)} = popen_rd($cmd, $env, $rdr);
 	fcntl($out_w, 1031, 4096) if $^O eq 'linux'; # 1031: F_SETPIPE_SZ
 	$out_w->autoflush(1);
@@ -69,8 +71,10 @@ 	my ($self) = @_;
 	delete $self->{in};
 	# GitAsyncCat::event_step may reap us with WNOHANG, too
 	my $pid = delete $self->{pid} or return;
-	PublicInbox::DS->in_loop ? $self->close : delete($self->{sock});
-	dwaitpid $pid;
+	if ($$ == $self->{owner_pid}) {
+		PublicInbox::DS->in_loop ? $self->close : delete($self->{sock});
+		dwaitpid $pid;
+	}
 }
 
 # used by GitAsyncCat
diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index fdfe126932038fba455ef09e7a9789a8f0796b60..47928c550298eff0d3a604ed96d508466df7f336 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -126,6 +126,7 @@ 		$redir->{2} = $fh;
 	}
 	my ($in_r, $p) = popen_rd(\@cmd, undef, $redir);
 	$self->{$pid} = $p;
+	$self->{"$pid.owner"} = $$;
 	$out_w->autoflush(1);
 	if ($^O eq 'linux') { # 1031: F_SETPIPE_SZ
 		fcntl($out_w, 1031, 4096);
@@ -327,7 +328,7 @@ 	delete $self->{$err} if $err; # `err_c'
 
 	# GitAsyncCat::event_step may delete {pid}
 	my $p = delete $self->{$pid} or return;
-	dwaitpid $p;
+	dwaitpid($p) if $$ == $self->{"$pid.owner"};
 }
 
 sub cat_async_abort ($) {