[ARVADOS] updated: ad48bb33bf49e3fec668a0ccf788ad9b2ffcaa80

Git user git at public.curoverse.com
Sat Feb 20 04:26:16 EST 2016


Summary of changes:
 sdk/cli/bin/crunch-job | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

  discards  b1484741b1f386baef94af4f879ff5209af98e04 (commit)
       via  ad48bb33bf49e3fec668a0ccf788ad9b2ffcaa80 (commit)

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commit ad48bb33bf49e3fec668a0ccf788ad9b2ffcaa80
Author: Tom Clegg <tom at curoverse.com>
Date:   Sat Feb 20 04:17:48 2016 -0500

    8099: When invoking setup tasks via srun, check slurm queue and propagate stderr to logs.

diff --git a/sdk/cli/bin/crunch-job b/sdk/cli/bin/crunch-job
index ae210a6..b63886e 100755
--- a/sdk/cli/bin/crunch-job
+++ b/sdk/cli/bin/crunch-job
@@ -183,11 +183,12 @@ if (($Job || $local_job)->{docker_image_locator}) {
   $cmd = [$docker_bin, 'ps', '-q'];
 }
 Log(undef, "Sanity check is `@$cmd`");
-srun(["srun", "--nodes=\Q$ENV{SLURM_NNODES}\E", "--ntasks-per-node=1"],
-     $cmd,
-     {fork => 1});
-if ($? != 0) {
-  Log(undef, "Sanity check failed: ".exit_status_s($?));
+my ($exited, $stdout, $stderr) = srun_sync(
+  ["srun", "--nodes=\Q$ENV{SLURM_NNODES}\E", "--ntasks-per-node=1"],
+  $cmd,
+  {label => "sanity check"});
+if ($exited != 0) {
+  Log(undef, "Sanity check failed: ".exit_status_s($exited));
   exit EX_TEMPFAIL;
 }
 Log(undef, "Sanity check OK");
@@ -386,28 +387,17 @@ my $nodelist = join(",", @node);
 my $git_tar_count = 0;
 
 if (!defined $no_clear_tmp) {
-  # Clean out crunch_tmp/work, crunch_tmp/opt, crunch_tmp/src*
-  Log (undef, "Clean work dirs");
-
-  my $cleanpid = fork();
-  if ($cleanpid == 0)
-  {
-    # Find FUSE mounts under $CRUNCH_TMP and unmount them.
-    # Then clean up work directories.
-    # TODO: When #5036 is done and widely deployed, we can limit mount's
-    # -t option to simply fuse.keep.
-    srun (["srun", "--nodelist=$nodelist", "-D", $ENV{'TMPDIR'}],
-          ['bash', '-ec', '-o', 'pipefail', 'mount -t fuse,fuse.keep | awk "(index(\$3, \"$CRUNCH_TMP\") == 1){print \$3}" | xargs -r -n 1 fusermount -u -z; sleep 1; rm -rf $JOB_WORK $CRUNCH_INSTALL $CRUNCH_TMP/task $CRUNCH_TMP/src* $CRUNCH_TMP/*.cid']);
-    exit (1);
-  }
-  while (1)
-  {
-    last if $cleanpid == waitpid (-1, WNOHANG);
-    freeze_if_want_freeze ($cleanpid);
-    select (undef, undef, undef, 0.1);
-  }
-  if ($?) {
-    Log(undef, "Clean work dirs: exit ".exit_status_s($?));
+  # Find FUSE mounts under $CRUNCH_TMP and unmount them.  Then clean
+  # up work directories crunch_tmp/work, crunch_tmp/opt,
+  # crunch_tmp/src*.
+  #
+  # TODO: When #5036 is done and widely deployed, we can limit mount's
+  # -t option to simply fuse.keep.
+  my ($exited, $stdout, $stderr) = srun_sync(
+    ["srun", "--nodelist=$nodelist", "-D", $ENV{'TMPDIR'}],
+    ['bash', '-ec', '-o', 'pipefail', 'mount -t fuse,fuse.keep | awk "(index(\$3, \"$CRUNCH_TMP\") == 1){print \$3}" | xargs -r -n 1 fusermount -u -z; sleep 1; rm -rf $JOB_WORK $CRUNCH_INSTALL $CRUNCH_TMP/task $CRUNCH_TMP/src* $CRUNCH_TMP/*.cid'],
+    {label => "clean work dirs"});
+  if ($exited != 0) {
     exit(EX_RETRY_UNLOCKED);
   }
 }
@@ -428,30 +418,22 @@ if ! $docker_bin images -q --no-trunc --all | grep -qxF \Q$docker_hash\E; then
     arv-get \Q$docker_locator$docker_stream/$docker_hash.tar\E | $docker_bin load
 fi
 };
-  my $docker_pid = fork();
-  if ($docker_pid == 0)
-  {
-    srun (["srun", "--nodelist=" . join(',', @node)],
-          ["/bin/bash", "-o", "pipefail", "-ec", $docker_install_script]);
-    exit ($?);
-  }
-  while (1)
-  {
-    last if $docker_pid == waitpid (-1, WNOHANG);
-    freeze_if_want_freeze ($docker_pid);
-    select (undef, undef, undef, 0.1);
-  }
-  if ($? != 0)
+
+  my ($exited, $stdout, $stderr) = srun_sync(
+    ["srun", "--nodelist=" . join(',', @node)],
+    ["/bin/bash", "-o", "pipefail", "-ec", $docker_install_script],
+    {label => "load docker image"});
+  if ($exited != 0)
   {
-    Log(undef, "Installing Docker image from $docker_locator exited " . exit_status_s($?));
     exit(EX_RETRY_UNLOCKED);
   }
 
   # Determine whether this version of Docker supports memory+swap limits.
-  srun(["srun", "--nodelist=" . $node[0]],
-       ["/bin/sh", "-ec", "$docker_bin run --help | grep -qe --memory-swap="],
-      {fork => 1});
-  $docker_limitmem = ($? == 0);
+  ($exited, $stdout, $stderr) = srun_sync(
+    ["srun", "--nodelist=" . $node[0]],
+    [$docker_bin, 'run', '--help'],
+    {label => "check --memory-swap feature"});
+  $docker_limitmem = ($stdout =~ /--memory-swap/);
 
   # Find a non-root Docker user to use.
   # Tries the default user for the container, then 'crunch', then 'nobody',
@@ -461,20 +443,22 @@ fi
   # Docker containers.
   my @tryusers = ("", "crunch", "nobody");
   foreach my $try_user (@tryusers) {
+    my $label;
     my $try_user_arg;
     if ($try_user eq "") {
-      Log(undef, "Checking if container default user is not UID 0");
+      $label = "check whether default user is UID 0";
       $try_user_arg = "";
     } else {
-      Log(undef, "Checking if user '$try_user' is not UID 0");
+      $label = "check whether user '$try_user' is UID 0";
       $try_user_arg = "--user=$try_user";
     }
-    srun(["srun", "--nodelist=" . $node[0]],
-         ["/bin/sh", "-ec",
-          "a=`$docker_bin run $docker_run_args $try_user_arg $docker_hash id --user` && " .
-          " test \$a -ne 0"],
-         {fork => 1});
-    if ($? == 0) {
+    my ($exited, $stdout, $stderr) = srun_sync(
+      ["srun", "--nodelist=" . $node[0]],
+      ["/bin/sh", "-ec",
+       "$docker_bin run $docker_run_args $try_user_arg $docker_hash id --user"],
+      {label => $label});
+    chomp($stdout);
+    if ($exited == 0 && $stdout =~ /^\d+$/ && $stdout > 0) {
       $dockeruserarg = $try_user_arg;
       if ($try_user eq "") {
         Log(undef, "Container will run with default user");
@@ -664,11 +648,9 @@ if (!defined $git_archive) {
   }
 }
 else {
-  my $install_exited;
+  my $exited;
   my $install_script_tries_left = 3;
   for (my $attempts = 0; $attempts < 3; $attempts++) {
-    Log(undef, "Run install script on all workers");
-
     my @srunargs = ("srun",
                     "--nodelist=$nodelist",
                     "-D", $ENV{'TMPDIR'}, "--job-name=$job_id");
@@ -676,59 +658,21 @@ else {
                     "mkdir -p $ENV{CRUNCH_INSTALL} && cd $ENV{CRUNCH_TMP} && perl -");
 
     $ENV{"CRUNCH_GIT_ARCHIVE_HASH"} = md5_hex($git_archive);
-    my ($install_stderr_r, $install_stderr_w);
-    pipe $install_stderr_r, $install_stderr_w or croak("pipe() failed: $!");
-    set_nonblocking($install_stderr_r);
-    my $installpid = fork();
-    if ($installpid == 0)
-    {
-      close($install_stderr_r);
-      fcntl($install_stderr_w, F_SETFL, 0) or croak($!); # no close-on-exec
-      open(STDOUT, ">&", $install_stderr_w);
-      open(STDERR, ">&", $install_stderr_w);
-      srun (\@srunargs, \@execargs, {}, $build_script . $git_archive);
-      exit (1);
-    }
-    close($install_stderr_w);
-    # Tell freeze_if_want_freeze how to kill the child, otherwise the
-    # "waitpid(installpid)" loop won't get interrupted by a freeze:
-    $proc{$installpid} = {};
-    my $stderr_buf = '';
-    # Track whether anything appears on stderr other than slurm errors
-    # ("srun: ...") and the "starting: ..." message printed by the
-    # srun subroutine itself:
+    my ($stdout, $stderr);
+    ($exited, $stdout, $stderr) = srun_sync(
+      \@srunargs, \@execargs,
+      {label => "run install script on all workers"},
+      $build_script . $git_archive);
+
     my $stderr_anything_from_script = 0;
-    my $match_our_own_errors = '^(srun: error: |starting: \[)';
-    while ($installpid != waitpid(-1, WNOHANG)) {
-      freeze_if_want_freeze ($installpid);
-      # Wait up to 0.1 seconds for something to appear on stderr, then
-      # do a non-blocking read.
-      my $bits = fhbits($install_stderr_r);
-      select ($bits, undef, $bits, 0.1);
-      if (0 < sysread ($install_stderr_r, $stderr_buf, 8192, length($stderr_buf)))
-      {
-        while ($stderr_buf =~ /^(.*?)\n/) {
-          my $line = $1;
-          substr $stderr_buf, 0, 1+length($line), "";
-          Log(undef, "stderr $line");
-          if ($line !~ /$match_our_own_errors/) {
-            $stderr_anything_from_script = 1;
-          }
-        }
-      }
-    }
-    delete $proc{$installpid};
-    $install_exited = $?;
-    close($install_stderr_r);
-    if (length($stderr_buf) > 0) {
-      if ($stderr_buf !~ /$match_our_own_errors/) {
+    for my $line (split(/\n/, $stderr)) {
+      if ($line !~ /^(srun: error: |starting: \[)/) {
         $stderr_anything_from_script = 1;
       }
-      Log(undef, "stderr $stderr_buf")
     }
 
-    Log (undef, "Install script exited ".exit_status_s($install_exited));
-    last if $install_exited == 0 || $main::please_freeze;
+    last if $exited == 0 || $main::please_freeze;
+
     # If the install script fails but doesn't print an error message,
     # the next thing anyone is likely to do is just run it again in
     # case it was a transient problem like "slurm communication fails
@@ -744,7 +688,7 @@ else {
     unlink($tar_filename);
   }
 
-  if ($install_exited != 0) {
+  if ($exited != 0) {
     croak("Giving up");
   }
 }
@@ -1013,11 +957,12 @@ for (my $todo_ptr = 0; $todo_ptr <= $#jobstep_todo; $todo_ptr ++)
     next;
   }
   shift @freeslot;
-  $proc{$childpid} = { jobstep => $id,
-		       time => time,
-		       slot => $childslot,
-		       jobstepname => "$job_id.$id.$childpid",
-		     };
+  $proc{$childpid} = {
+    jobstepidx => $id,
+    time => time,
+    slot => $childslot,
+    jobstepname => "$job_id.$id.$childpid",
+  };
   croak ("assert failed: \$slot[$childslot]->{'pid'} exists") if exists $slot[$childslot]->{pid};
   $slot[$childslot]->{pid} = $childpid;
 
@@ -1191,9 +1136,9 @@ sub reapchildren
   my $whatslot = ($slot[$proc{$pid}->{slot}]->{node}->{name}
 		  . "."
 		  . $slot[$proc{$pid}->{slot}]->{cpu});
-  my $jobstepid = $proc{$pid}->{jobstep};
+  my $jobstepidx = $proc{$pid}->{jobstepidx};
   my $elapsed = time - $proc{$pid}->{time};
-  my $Jobstep = $jobstep[$jobstepid];
+  my $Jobstep = $jobstep[$jobstepidx];
 
   my $childstatus = $?;
   my $exitvalue = $childstatus >> 8;
@@ -1201,11 +1146,11 @@ sub reapchildren
   $Jobstep->{'arvados_task'}->reload;
   my $task_success = $Jobstep->{'arvados_task'}->{success};
 
-  Log ($jobstepid, "child $pid on $whatslot $exitinfo success=$task_success");
+  Log ($jobstepidx, "child $pid on $whatslot $exitinfo success=$task_success");
 
   if (!defined $task_success) {
     # task did not indicate one way or the other --> fail
-    Log($jobstepid, sprintf(
+    Log($jobstepidx, sprintf(
           "ERROR: Task process exited %s, but never updated its task record to indicate success and record its output.",
           exit_status_s($childstatus)));
     $Jobstep->{'arvados_task'}->{success} = 0;
@@ -1229,14 +1174,14 @@ sub reapchildren
       # node is already suspected faulty and srun exited quickly
       if ($slot[$proc{$pid}->{slot}]->{node}->{hold_until} &&
 	  $elapsed < 5) {
-	Log ($jobstepid, "blaming failure on suspect node " .
+	Log ($jobstepidx, "blaming failure on suspect node " .
              $slot[$proc{$pid}->{slot}]->{node}->{name});
         $temporary_fail ||= 1;
       }
       ban_node_by_slot($proc{$pid}->{slot});
     }
 
-    Log ($jobstepid, sprintf('failure (#%d, %s) after %d seconds',
+    Log ($jobstepidx, sprintf('failure (#%d, %s) after %d seconds',
                              ++$Jobstep->{'failures'},
                              $temporary_fail ? 'temporary' : 'permanent',
                              $elapsed));
@@ -1246,7 +1191,7 @@ sub reapchildren
       $main::success = 0;
     }
     # Put this task back on the todo queue
-    push @jobstep_todo, $jobstepid;
+    push @jobstep_todo, $jobstepidx;
     $Job->{'tasks_summary'}->{'failed'}++;
   }
   else
@@ -1255,20 +1200,20 @@ sub reapchildren
     $slot[$proc{$pid}->{slot}]->{node}->{losing_streak} = 0;
     $slot[$proc{$pid}->{slot}]->{node}->{hold_until} = 0;
     $slot[$proc{$pid}->{slot}]->{node}->{fail_count} = 0;
-    push @jobstep_done, $jobstepid;
-    Log ($jobstepid, "success in $elapsed seconds");
+    push @jobstep_done, $jobstepidx;
+    Log ($jobstepidx, "success in $elapsed seconds");
   }
   $Jobstep->{exitcode} = $childstatus;
   $Jobstep->{finishtime} = time;
   $Jobstep->{'arvados_task'}->{finished_at} = strftime "%Y-%m-%dT%H:%M:%SZ", gmtime($Jobstep->{finishtime});
   $Jobstep->{'arvados_task'}->save;
-  process_stderr ($jobstepid, $task_success);
-  Log ($jobstepid, sprintf("task output (%d bytes): %s",
+  process_stderr_final ($jobstepidx);
+  Log ($jobstepidx, sprintf("task output (%d bytes): %s",
                            length($Jobstep->{'arvados_task'}->{output}),
                            $Jobstep->{'arvados_task'}->{output}));
 
-  close $reader{$jobstepid};
-  delete $reader{$jobstepid};
+  close $reader{$jobstepidx};
+  delete $reader{$jobstepidx};
   delete $slot[$proc{$pid}->{slot}]->{pid};
   push @freeslot, $proc{$pid}->{slot};
   delete $proc{$pid};
@@ -1306,7 +1251,10 @@ sub reapchildren
 sub check_refresh_wanted
 {
   my @stat = stat $ENV{"CRUNCH_REFRESH_TRIGGER"};
-  if (@stat && $stat[9] > $latest_refresh) {
+  if (@stat &&
+      $stat[9] > $latest_refresh &&
+      # ...and we have actually locked the job record...
+      $job_id eq $Job->{'uuid'}) {
     $latest_refresh = scalar time;
     my $Job2 = api_call("jobs/get", uuid => $jobspec);
     for my $attr ('cancelled_at',
@@ -1346,7 +1294,7 @@ sub check_squeue
   my $silent_procs = 0;
   for my $procinfo (values %proc)
   {
-    my $jobstep = $jobstep[$procinfo->{jobstep}];
+    my $jobstep = $jobstep[$procinfo->{jobstepidx}];
     if ($jobstep->{stderr_at} < $last_squeue_check)
     {
       $silent_procs++;
@@ -1357,7 +1305,7 @@ sub check_squeue
   # use killem() on procs whose killtime is reached
   while (my ($pid, $procinfo) = each %proc)
   {
-    my $jobstep = $jobstep[$procinfo->{jobstep}];
+    my $jobstep = $jobstep[$procinfo->{jobstepidx}];
     if (exists $procinfo->{killtime}
         && $procinfo->{killtime} <= time
         && $jobstep->{stderr_at} < $last_squeue_check)
@@ -1366,7 +1314,7 @@ sub check_squeue
       if ($jobstep->{stderr_at}) {
         $sincewhen = " in last " . (time - $jobstep->{stderr_at}) . "s";
       }
-      Log($procinfo->{jobstep}, "killing orphaned srun process $pid (task not in slurm queue, no stderr received$sincewhen)");
+      Log($procinfo->{jobstepidx}, "killing orphaned srun process $pid (task not in slurm queue, no stderr received$sincewhen)");
       killem ($pid);
     }
   }
@@ -1416,7 +1364,7 @@ sub check_squeue
       # error/delay has caused the task to die without notifying srun,
       # and we'll kill srun ourselves.
       $procinfo->{killtime} = time + 30;
-      Log($procinfo->{jobstep}, "notice: task is not in slurm queue but srun process $pid has not exited");
+      Log($procinfo->{jobstepidx}, "notice: task is not in slurm queue but srun process $pid has not exited");
     }
   }
 }
@@ -1435,70 +1383,90 @@ sub release_allocation
 sub readfrompipes
 {
   my $gotsome = 0;
-  foreach my $job (keys %reader)
+  foreach my $jobstepidx (keys %reader)
   {
     my $buf;
-    if (0 < sysread ($reader{$job}, $buf, 65536))
+    if ($jobstep[$jobstepidx]->{stdout_r} &&
+        0 < sysread ($jobstep[$jobstepidx]->{stdout_r}, $buf, 65536))
+    {
+      print STDERR $buf if $ENV{CRUNCH_DEBUG};
+      if (exists $jobstep[$jobstepidx]->{stdout_captured}) {
+        $jobstep[$jobstepidx]->{stdout_captured} .= $buf;
+      }
+      $gotsome = 1;
+    }
+    if (0 < sysread ($reader{$jobstepidx}, $buf, 65536))
     {
       print STDERR $buf if $ENV{CRUNCH_DEBUG};
-      $jobstep[$job]->{stderr_at} = time;
-      $jobstep[$job]->{stderr} .= $buf;
+      $jobstep[$jobstepidx]->{stderr_at} = time;
+      $jobstep[$jobstepidx]->{stderr} .= $buf;
+      if (exists $jobstep[$jobstepidx]->{stderr_captured}) {
+        $jobstep[$jobstepidx]->{stderr_captured} .= $buf;
+      }
+      $gotsome = 1;
 
       # Consume everything up to the last \n
-      preprocess_stderr ($job);
+      preprocess_stderr ($jobstepidx);
 
-      if (length ($jobstep[$job]->{stderr}) > 16384)
+      if (length ($jobstep[$jobstepidx]->{stderr}) > 16384)
       {
         # If we get a lot of stderr without a newline, chop off the
         # front to avoid letting our buffer grow indefinitely.
-        substr ($jobstep[$job]->{stderr},
-                0, length($jobstep[$job]->{stderr}) - 8192) = "";
+        substr ($jobstep[$jobstepidx]->{stderr},
+                0, length($jobstep[$jobstepidx]->{stderr}) - 8192) = "";
       }
-      $gotsome = 1;
     }
   }
   return $gotsome;
 }
 
 
+# Consume all full lines of stderr for a jobstep. Everything after the
+# last newline will remain in $jobstep[$jobstepidx]->{stderr} after
+# returning.
 sub preprocess_stderr
 {
-  my $job = shift;
+  my $jobstepidx = shift;
 
-  while ($jobstep[$job]->{stderr} =~ /^(.*?)\n/) {
+  while ($jobstep[$jobstepidx]->{stderr} =~ /^(.*?)\n/) {
     my $line = $1;
-    substr $jobstep[$job]->{stderr}, 0, 1+length($line), "";
-    Log ($job, "stderr $line");
+    substr $jobstep[$jobstepidx]->{stderr}, 0, 1+length($line), "";
+    Log ($jobstepidx, "stderr $line");
     if ($line =~ /srun: error: (SLURM job $ENV{SLURM_JOB_ID} has expired|Unable to confirm allocation for job $ENV{SLURM_JOB_ID})/) {
       # whoa.
       $main::please_freeze = 1;
     }
+    elsif (!exists $jobstep[$jobstepidx]->{slotindex}) {
+      # Skip the following tempfail checks if this srun proc isn't
+      # attached to a particular worker slot.
+    }
     elsif ($line =~ /srun: error: (Node failure on|Aborting, .*\bio error\b)/) {
-      my $job_slot_index = $jobstep[$job]->{slotindex};
+      my $job_slot_index = $jobstep[$jobstepidx]->{slotindex};
+      my $job_slot_index = $jobstep[$jobstepidx]->{slotindex};
       $slot[$job_slot_index]->{node}->{fail_count}++;
-      $jobstep[$job]->{tempfail} = 1;
+      $jobstep[$jobstepidx]->{tempfail} = 1;
       ban_node_by_slot($job_slot_index);
     }
     elsif ($line =~ /srun: error: (Unable to create job step|.*: Communication connection failure)/) {
-      $jobstep[$job]->{tempfail} = 1;
-      ban_node_by_slot($jobstep[$job]->{slotindex});
+      $jobstep[$jobstepidx]->{tempfail} = 1;
+      ban_node_by_slot($jobstep[$jobstepidx]->{slotindex});
     }
     elsif ($line =~ /arvados\.errors\.Keep/) {
-      $jobstep[$job]->{tempfail} = 1;
+      $jobstep[$jobstepidx]->{tempfail} = 1;
     }
   }
 }
 
 
-sub process_stderr
+sub process_stderr_final
 {
-  my $job = shift;
-  my $task_success = shift;
-  preprocess_stderr ($job);
+  my $jobstepidx = shift;
+  preprocess_stderr ($jobstepidx);
 
   map {
-    Log ($job, "stderr $_");
-  } split ("\n", $jobstep[$job]->{stderr});
+    Log ($jobstepidx, "stderr $_");
+  } split ("\n", $jobstep[$jobstepidx]->{stderr});
+  $jobstep[$jobstepidx]->{stderr} = '';
 }
 
 sub fetch_block
@@ -1636,7 +1604,7 @@ sub killem
     }
     if (!exists $proc{$_}->{"sent_$sig"})
     {
-      Log ($proc{$_}->{jobstep}, "sending 2x signal $sig to pid $_");
+      Log ($proc{$_}->{jobstepidx}, "sending 2x signal $sig to pid $_");
       kill $sig, $_;
       select (undef, undef, undef, 0.1);
       if ($sig == 2)
@@ -1760,16 +1728,21 @@ sub log_writer_is_active() {
   return $log_pipe_pid;
 }
 
-sub Log				# ($jobstep_id, $logmessage)
+sub Log				# ($jobstepidx, $logmessage)
 {
-  if ($_[1] =~ /\n/) {
+  my ($jobstepidx, $logmessage) = @_;
+  if ($logmessage =~ /\n/) {
     for my $line (split (/\n/, $_[1])) {
-      Log ($_[0], $line);
+      Log ($jobstepidx, $line);
     }
     return;
   }
   my $fh = select STDERR; $|=1; select $fh;
-  my $message = sprintf ("%s %d %s %s", $job_id, $$, @_);
+  my $task_qseq = '';
+  if (defined($jobstepidx) && exists($jobstep[$jobstepidx]->{arvados_task})) {
+    $task_qseq = $jobstepidx;
+  }
+  my $message = sprintf ("%s %d %s %s", $job_id, $$, $task_qseq, $logmessage);
   $message =~ s{([^ -\176])}{"\\" . sprintf ("%03o", ord($1))}ge;
   $message .= "\n";
   my $datetime;
@@ -1893,6 +1866,83 @@ sub freezeunquote
 }
 
 
+sub srun_sync
+{
+  my $srunargs = shift;
+  my $execargs = shift;
+  my $opts = shift || {};
+  my $stdin = shift;
+
+  my $label = exists $opts->{label} ? $opts->{label} : "@$execargs";
+  Log (undef, "$label: start");
+
+  my ($stderr_r, $stderr_w);
+  pipe $stderr_r, $stderr_w or croak("pipe() failed: $!");
+
+  my ($stdout_r, $stdout_w);
+  pipe $stdout_r, $stdout_w or croak("pipe() failed: $!");
+
+  my $srunpid = fork();
+  if ($srunpid == 0)
+  {
+    close($stderr_r);
+    close($stdout_r);
+    fcntl($stderr_w, F_SETFL, 0) or croak($!); # no close-on-exec
+    fcntl($stdout_w, F_SETFL, 0) or croak($!);
+    open(STDERR, ">&", $stderr_w);
+    open(STDOUT, ">&", $stdout_w);
+    srun ($srunargs, $execargs, $opts, $stdin);
+    exit (1);
+  }
+  close($stderr_w);
+  close($stdout_w);
+
+  set_nonblocking($stderr_r);
+  set_nonblocking($stdout_r);
+
+  # Add entries to @jobstep and %proc so check_squeue() and
+  # freeze_if_want_freeze() can treat it like a job task process.
+  push @jobstep, {
+    stderr => '',
+    stderr_at => 0,
+    stderr_captured => '',
+    stdout_r => $stdout_r,
+    stdout_captured => '',
+  };
+  my $jobstepidx = $#jobstep;
+  $proc{$srunpid} = {
+    jobstepidx => $jobstepidx,
+  };
+  $reader{$jobstepidx} = $stderr_r;
+
+  while ($srunpid != waitpid ($srunpid, WNOHANG)) {
+    my $busy = readfrompipes();
+    if (!$busy || ($latest_refresh + 2 < scalar time)) {
+      check_refresh_wanted();
+      check_squeue();
+    }
+    if (!$busy) {
+      select(undef, undef, undef, 0.1);
+    }
+    killem(keys %proc) if $main::please_freeze;
+  }
+  my $exited = $?;
+
+  1 while readfrompipes();
+  process_stderr_final ($jobstepidx);
+
+  Log (undef, "$label: exit ".exit_status_s($exited));
+
+  close($stdout_r);
+  close($stderr_r);
+  delete $proc{$srunpid};
+  delete $reader{$jobstepidx};
+
+  my $j = pop @jobstep;
+  return ($exited, $j->{stdout_captured}, $j->{stderr_captured});
+}
+
+
 sub srun
 {
   my $srunargs = shift;
diff --git a/sdk/cli/test/binstub_clean_fail/mount b/sdk/cli/test/binstub_clean_fail/mount
index 961ac28..52a7353 100755
--- a/sdk/cli/test/binstub_clean_fail/mount
+++ b/sdk/cli/test/binstub_clean_fail/mount
@@ -1,3 +1,3 @@
 #!/bin/sh
 echo >&2 Failing mount stub was called
-exit 1
+exit 44
diff --git a/sdk/cli/test/test_crunch-job.rb b/sdk/cli/test/test_crunch-job.rb
index 22d756a..0fbff2e 100644
--- a/sdk/cli/test/test_crunch-job.rb
+++ b/sdk/cli/test/test_crunch-job.rb
@@ -91,7 +91,7 @@ class TestCrunchJob < Minitest::Test
       tryjobrecord j, binstubs: ['clean_fail']
     end
     assert_match /Failing mount stub was called/, err
-    assert_match /Clean work dirs: exit 1\n$/, err
+    assert_match /clean work dirs: exit 44\n$/, err
     assert_equal SPECIAL_EXIT[:EX_RETRY_UNLOCKED], $?.exitstatus
   end
 

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