fix(controller,xceadmin): fix zero-slot scheduling block, misleading resval logs, byte-unit display
Three bugs found while diagnosing a live controller log, all in the worker resource-value path: 1. Every host relying on the documented hosts.yaml auto-detect default (no max_slot, meaning "use CPU count") got 0 scheduling slots, permanently blocking the scheduler from placing jobs on it. mxj is UInt32 on the wire and can't carry the schema's -1 sentinel; mapping.py worked around this by leaving it unset, which defaults to 0 -- and 0 is never < 0, so apply_join_state()'s auto-detect fallback never fired. Fixed by encoding the sentinel as 0xFFFFFFFF, which the controller's `int mxj` field reinterprets back to -1 via its existing implicit uint32_t->int conversion. No C-side or wire schema change needed for this part; the fallback itself was already correct but had zero test coverage for a negative mxj, now added. 2. update_resvals()/update_resval_list() logged the failure reason via PERROR, which reads process-global errno -- but update_resval()'s failure paths return raw negative codes directly and never touch errno, so the controller log filled with misleading "update_resval: Success" / "update_resval: Resource temporarily unavailable" lines instead of the real reason. Fixed to decode the actual rc via xce_strerror_r and name the failing resource. 3. maxmem is canonically stored/wired as raw bytes but had no unit metadata, so resval/workerlist printed it as a bare number that read as garbage (e.g. workerlist's fixed-width columns visually smeared a multi-GB byte count across the MaxCPU/MaxMem headers). Added an optional `unit` field to the Resource/ResourceVal capnp structs (and xce_resource_t/xce_resval_t/resources.yaml) so resval and workerlist can render a human-readable value (e.g. "30.90 GB") while the stored value stays raw bytes -- display-only, every other resource unaffected. Regenerated the xceadmin golden fixture (fixtures/full/expected.bin) twice: once for the mxj sentinel encoding change, once for the new Resource.unit field growing every resource's wire size by one pointer slot. Both diffs verified byte-for-byte isolated to exactly the expected change before regenerating. Verified: 1095/1095 controller_unit_test (stable across repeated runs), 229/229 xceadmin pytest, clean rebuild of lib/controller/xceadmin/xce_test. Two related findings logged to .wolf/buglog.json but deliberately not fixed here (out of scope per discussion): a pre-existing flaky segfault in the combined controller_unit_test binary, and maxswap/maxtmp being hardcoded stub values on the worker side. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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12 changed files with 354 additions and 20 deletions
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@ -1050,6 +1050,9 @@ static char* worker_status_str(uint32_t status)
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return "UNKOWN";
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}
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/* forward decl: defined near cmd_resval, below, which also uses it */
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static void format_bytes_human(double bytes, char* buf, size_t bufsize);
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int cmd_workerlist(int argc, char* argv[])
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{
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int rc, i;
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@ -1068,11 +1071,19 @@ int cmd_workerlist(int argc, char* argv[])
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"MaxSwap", "MaxTmp", "NDisks");
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for (i = 0; i < rc; i++) {
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printf("%-20s%-8s%-25s%-25s%12f%12d%12f%12f%12f%12d\n",
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/* MaxMem is stored/wired as raw bytes (xce_resource_t.unit="bytes"
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* for the maxmem resource definition) -- humanize for display only,
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* every other column stays as-is. */
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char maxmem_buf[64];
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format_bytes_human(workers[i]->attrs->maxmem, maxmem_buf,
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sizeof(maxmem_buf));
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printf("%-20s%-8s%-25s%-25s%12f%12d%12s%12f%12f%12d\n",
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workers[i]->name, worker_status_str(workers[i]->status),
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workers[i]->attrs->hosttype, workers[i]->attrs->hostmodel,
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workers[i]->attrs->cpufactor, workers[i]->attrs->maxcpus,
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workers[i]->attrs->maxmem, workers[i]->attrs->maxswap,
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maxmem_buf, workers[i]->attrs->maxswap,
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workers[i]->attrs->maxtmp, workers[i]->attrs->ndisks);
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}
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@ -2024,6 +2035,28 @@ cleanup:
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return 0;
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}
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/*
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* Render a raw byte count as a human-readable string (e.g. "30.90 GB").
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* Only used for display -- the stored/wire value stays raw bytes always,
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* this never feeds back into anything that's compared or persisted. A
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* pure function so it's directly unit-testable without a live client
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* connection.
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*/
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static void format_bytes_human(double bytes, char* buf, size_t bufsize)
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{
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static const char* const UNITS[] = { "B", "KB", "MB", "GB", "TB", "PB" };
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const int nunits = (int)(sizeof(UNITS) / sizeof(UNITS[0]));
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double val = bytes;
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int i = 0;
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while (val >= 1024.0 && i < nunits - 1) {
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val /= 1024.0;
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i++;
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}
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snprintf(buf, bufsize, "%.2f %s", val, UNITS[i]);
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}
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int cmd_resval(int argc, char* argv[])
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{
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char* host = NULL;
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@ -2065,7 +2098,15 @@ int cmd_resval(int argc, char* argv[])
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printf("%s\n", val->val->u.svalue);
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break;
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case Value_u_fvalue:
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printf("%f\n", val->val->u.fvalue);
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if ((val->unit != NULL) && (strcmp(val->unit, "bytes") == 0)) {
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char hbuf[64];
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format_bytes_human(val->val->u.fvalue, hbuf,
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sizeof(hbuf));
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printf("%f (%s)\n", val->val->u.fvalue, hbuf);
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} else {
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printf("%f\n", val->val->u.fvalue);
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}
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break;
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case Value_u_bvalue:
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printf("%s\n", (val->val->u.bvalue == 0) ? "false" : "true");
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@ -17,6 +17,7 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <unity/unity.h>
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@ -152,6 +153,132 @@ static float get_worker_res_fval(worker_t* w, const char* name)
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return (v != NULL) ? v->u.fvalue : -1.0f;
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}
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/*
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* Capture whatever update_resvals()/update_resval_list() print during a
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* failing update_resval() call, as raw runtime output rather than a
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* source-text scan. This test binary never calls mylog_init()/tlog_init()
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* (only the real daemon main()s do -- see test_apply_correctness_
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* verification.c's own header comment, and the identical established
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* precedent in scheduler/testsuite/test_scheduler_connect.c's
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* capture_stdout_during_sched_init()), so tlog's internal root log handle
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* stays NULL and every ERROR()/WARN() call falls through tlog's early-
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* print path, which writes the fully formatted line directly to
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* STDOUT_FILENO via a raw write() -- genuine runtime log capture, not a
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* guess about which stream PERROR/ERROR happens to use.
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*/
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static char* capture_stdout_during(void (*fn)(void* ctx), void* ctx)
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{
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char tmp[] = "/tmp/xce_worker_join_logcap_XXXXXX";
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int fd = mkstemp(tmp);
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TEST_ASSERT_TRUE_MESSAGE(fd >= 0,
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"fixture: mkstemp for stdout capture must succeed");
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fflush(stdout);
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int saved_stdout = dup(STDOUT_FILENO);
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TEST_ASSERT_TRUE_MESSAGE(saved_stdout >= 0,
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"fixture: dup(STDOUT_FILENO) must succeed");
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TEST_ASSERT_TRUE_MESSAGE(dup2(fd, STDOUT_FILENO) >= 0,
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"fixture: dup2 redirect of STDOUT_FILENO must "
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"succeed");
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fn(ctx);
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fflush(stdout);
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dup2(saved_stdout, STDOUT_FILENO);
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close(saved_stdout);
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off_t len = lseek(fd, 0, SEEK_CUR);
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TEST_ASSERT_TRUE_MESSAGE(len >= 0,
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"fixture: lseek on capture file must succeed");
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char* buf = (char*)calloc(1, (size_t)len + 1);
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TEST_ASSERT_NOT_NULL(buf);
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if (len > 0) {
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TEST_ASSERT_TRUE_MESSAGE(lseek(fd, 0, SEEK_SET) == 0,
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"fixture: rewind of capture file must "
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"succeed");
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ssize_t nread = read(fd, buf, (size_t)len);
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TEST_ASSERT_TRUE_MESSAGE(nread == len,
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"fixture: reading back captured buffer "
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"must succeed");
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}
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close(fd);
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unlink(tmp);
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return buf;
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}
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typedef struct {
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cluster_t* c;
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worker_t* w;
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xce_resval_t* val;
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} update_resvals_call_ctx_t;
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static void call_update_resvals_1(void* ctx_)
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{
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update_resvals_call_ctx_t* ctx = (update_resvals_call_ctx_t*)ctx_;
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update_resvals(ctx->c, ctx->w, 1, ctx->val);
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}
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/*
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* update_resval() returns its failure reason as a raw negative code
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* directly (key_find/zarray_put convention -- never via errno), so
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* update_resvals()/update_resval_list() logging it via PERROR (which reads
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* the process-global errno) reported whatever errno happened to be left
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* over from an unrelated earlier call: "Success" if nothing had touched
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* it, or a stray EAGAIN/etc from some other syscall in the same event-loop
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* iteration -- never the real reason a resource update failed. This test
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* reproduces that exact symptom (ambient errno=EAGAIN, unrelated to the
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* genuine failure) and proves the fix decodes the actual rc instead.
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*/
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static void test_update_resvals_logs_actual_rc_not_stale_errno(void)
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{
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setup_test_cluster();
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hostattrs_t attrs;
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memset(&attrs, 0, sizeof(attrs));
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attrs.hosttype = makeString("LINUX");
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attrs.hostmodel = makeString("x86");
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worker_t* w = make_test_worker("host-resval-log", &attrs);
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TEST_ASSERT_NOT_NULL(w);
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xce_val_t fval;
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memset(&fval, 0, sizeof(fval));
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fval.which = Value_u_fvalue;
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fval.u.fvalue = 1.0f;
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xce_resval_t val;
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val.name = "does-not-exist-in-resmgr";
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val.val = &fval;
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/* Simulate the exact reported symptom: ambient errno unrelated to the
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* real failure, left over from some other unrelated call. */
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errno = EAGAIN;
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update_resvals_call_ctx_t ctx = { .c = &g_tc.c, .w = w, .val = &val };
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char* captured = capture_stdout_during(call_update_resvals_1, &ctx);
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TEST_ASSERT_NOT_NULL(captured);
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TEST_ASSERT_NULL_MESSAGE(
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strstr(captured, "Resource temporarily unavailable"),
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"must not log the ambient errno's string (EAGAIN) -- that is not "
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"why update_resval failed");
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TEST_ASSERT_NULL_MESSAGE(
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strstr(captured, "Success"),
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"must not log \"Success\" for a call that returned rc<0");
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TEST_ASSERT_NOT_NULL_MESSAGE(
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strstr(captured, "does-not-exist-in-resmgr"),
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"must name which resource failed");
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TEST_ASSERT_NOT_NULL_MESSAGE(
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strstr(captured, "No such file or directory"),
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"must log the real reason (-ENOENT, from key_find on an "
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"unregistered resource name)");
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free(captured);
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teardown_test_cluster();
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printf("test_update_resvals_logs_actual_rc_not_stale_errno: PASS\n");
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}
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/* ── Task 1.1: Tests for apply_join_state ──────────────────────────── */
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/*
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printf("test_apply_join_state_updates_resource_values: PASS\n");
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}
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/*
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* hconfig.mxj == -1 is the schema's documented "auto-detect" sentinel
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* (hosts.schema.json: "max_slot": {"minimum": -1, "description": "-1 means
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* auto-detect"}) -- apply_join_state must fall back to the worker's own
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* reported maxcpus, NOT persist -1 (or, before the xceadmin mapping fix,
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* silently ship 0 and permanently disable scheduling on that host: mxj is
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* UInt32 on the wire, so an unset/absent max_slot used to decode as 0,
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* which is not < 0 and so never reached this fallback -- see
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* xcecommon.mapping.HOSTCONFIG_MXJ_AUTO_DETECT). This is the ONLY test in
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* this file that exercises the nslots<0 branch; every sibling test above
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* uses a positive hconfig.mxj and so cannot catch a regression here.
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*/
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static void test_apply_join_state_mxj_negative_one_falls_back_to_maxcpus(void)
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{
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setup_test_cluster();
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hostattrs_t attrs;
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memset(&attrs, 0, sizeof(attrs));
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attrs.hosttype = makeString("LINUX");
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attrs.hostmodel = makeString("x86");
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attrs.cpufactor = 1.0f;
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attrs.maxcpus = 12;
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attrs.maxmem = 64;
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attrs.maxswap = 128;
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attrs.maxtmp = 256;
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attrs.ndisks = 2;
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worker_t* w = make_test_worker("host-ajs-autodetect", &attrs);
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TEST_ASSERT_NOT_NULL(w);
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xce_hostconfig_t hconfig;
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memset(&hconfig, 0, sizeof(hconfig));
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hconfig.hosttype = (char*)"!";
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hconfig.hostmodel = (char*)"!";
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hconfig.mxj = -1;
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endpoint_t ep;
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memset(&ep, 0, sizeof(ep));
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lock(w, RTTI_LOCK_WRITE);
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int rc = apply_join_state(&g_tc.c, w, &ep, &hconfig);
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unlock(w);
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TEST_ASSERT_EQUAL_INT(0, rc);
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TEST_ASSERT_EQUAL_FLOAT_MESSAGE(
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12.0f, get_worker_res_fval(w, "slots"),
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"mxj=-1 must auto-detect slots from the worker's reported maxcpus, "
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"not persist -1 or silently leave slots at 0");
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teardown_test_cluster();
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printf("test_apply_join_state_mxj_negative_one_falls_back_to_maxcpus: "
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"PASS\n");
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}
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/* ── Task 1.2: Tests for init_worker ────────────────────────────────── */
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/*
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@ -520,10 +701,13 @@ void test_worker_join(void)
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/* xstring_table_init must be called once before any makeString usage */
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xstring_table_init(139);
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RUN_TEST(test_update_resvals_logs_actual_rc_not_stale_errno);
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/* Task 1.1: apply_join_state (shared status/resource update) */
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RUN_TEST(test_apply_join_state_clears_unavail);
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RUN_TEST(test_apply_join_state_applies_hosttype_override);
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RUN_TEST(test_apply_join_state_updates_resource_values);
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RUN_TEST(test_apply_join_state_mxj_negative_one_falls_back_to_maxcpus);
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/* Task 1.2: init_worker (first-time join) */
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RUN_TEST(test_init_worker_creates_new_entry);
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