Re: [ID 20001009.004] SEGV from sprintf in a thread

Message-Id: <200010101310.OAA00953@hugo.hybyte.com>

p4raw-id: //depot/perl@7186

2 files changed, 17 insertions, 2 deletions

diff --git a/t/lib/thr5005.t b/t/lib/thr5005.t
index 057a08fe7d..680e1af3e7 100755
--- a/t/lib/thr5005.t
+++ b/t/lib/thr5005.t
@@ -13,7 +13,7 @@ BEGIN {
     $ENV{PERL_DESTRUCT_LEVEL} = 0 unless $ENV{PERL_DESTRUCT_LEVEL} > 3;
 }
 $| = 1;
-print "1..21\n";
+print "1..22\n";
 use Thread 'yield';
 print "ok 1\n";
 
@@ -89,6 +89,18 @@ my $long  = "This is short.";
 my $longe  = " short.";
 my $thr1 = new Thread \&threaded, $short, $shorte, "19";
 my $thr2 = new Thread \&threaded, $long, $longe, "20";
+my $thr3 = new Thread \&testsprintf, "21";
+
+sub testsprintf {
+  my $testno = shift;
+  # this may coredump if thread vars are not properly initialised
+  my $same = sprintf "%.0f", $testno;
+  if ($testno eq $same) {
+    print "ok $testno\n";
+  } else {
+    print "not ok $testno\t# '$testno' ne '$same'\n";
+  }
+}
 
 sub threaded {
   my ($string, $string_end, $testno) = @_;
@@ -115,4 +127,5 @@ EOT
 }
 $thr1->join;
 $thr2->join;
-print "ok 21\n";
+$thr3->join;
+print "ok 22\n";
diff --git a/util.c b/util.c
index 0c26f8310b..6c949c7da0 100644
--- a/util.c
+++ b/util.c
@@ -3589,6 +3589,8 @@ Perl_new_struct_thread(pTHX_ struct perl_thread *t)
     PL_dirty = 0;
     PL_localizing = 0;
     Zero(&PL_hv_fetch_ent_mh, 1, HE);
+    PL_efloatbuf = (char*)NULL;
+    PL_efloatsize = 0;
 #else
     Zero(thr, 1, struct perl_thread);
 #endif