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feat(xce-build): add non-ASAN debug + release profiles; root-cause bug-1286 with the debug build

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/xce-build now takes a build PROFILE: asan (default, debug+ASAN -> xce.build,
backward-compatible), debug (non-ASAN -O0 -g3 -fno-inline -fno-omit-frame-pointer
-> build.dbg, for gdb/cores), release (-O3 -> build.release). Each profile uses
its own default build dir so variants don't clobber each other; arg2 may still be
a legacy build_dir. asan runs the unit suites; debug/release are build-only (the
suites are ASAN-oriented and the meson test harness is overlay-fs fragile, bug-924)
and print how to run a suite directly.

Why: bug-1282/bug-1286 are heisenbugs ASAN perturbs away (no SIGSEGV) and that
gdb-on-release turns into a hang/timeout. The non-ASAN -O0 -g3 build reproduces
them AND yields a symbolized backtrace under gdb.

It immediately paid off: the debug profile ROOT-CAUSED bug-1286 (the round-4
segfault) — myreq_handler (cluster.c:251) does `c = ep->owner` then
`ha_dispatch_gate(&c->ha,…)`; on chaotic restart a walCatchupEntry (op 37) vtask
runs with ep->owner==NULL, so &c->ha = 0x3ff0 -> deref crash at ha.c:3194. Fix is
a NULL-guard in myreq_handler (+ owner-lifecycle). 7.2 now has one remaining
blocker (bug-1286, root-caused); bug-1282 deadlock is fixed.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019dbTHR9CsEYK9RsqmQpQpC
This commit is contained in:
Rongsong Shen 2026-06-30 09:15:36 +00:00
parent e90bf835f9
commit 02e9275706
5 changed files with 208 additions and 25 deletions
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15
.claude/skills/xce-build/SKILL.md
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@ -1,6 +1,6 @@
---
name: xce-build
description: "Build XCE components with tests. Usage: /xce-build [component] [build_dir]. Components: all (default), lib, controller, scheduler, worker, apiserver, xcecli"
description: "Build XCE components with tests. Usage: /xce-build [component] [profile] [build_dir]. Components: all (default), lib, controller, scheduler, worker, apiserver, xcecli. Profiles: asan (default), debug (non-ASAN -O0 -g3 for gdb/cores), release."
context: fork
disable-model-invocation: false
allowed-tools: Bash(*)
@ -8,10 +8,19 @@ allowed-tools: Bash(*)
## build xce source code
Args: `[component] [profile|build_dir] [build_dir]`
- **component** — `all` (default), `lib`, `controller`, `scheduler`, `worker`, `apiserver`, `xcecli`
- **profile** — `asan` (default: debug + AddressSanitizer → `xce.build`), `debug` (non-ASAN `-O0 -g3 -fno-inline -fno-omit-frame-pointer` → `build.dbg`), `release` (`-O3`, no sanitizer → `build.release`). Each profile uses its own default build dir so the variants never clobber each other. Arg 2 may also be a legacy explicit build_dir (anything that isn't a profile keyword); arg 3 overrides the build dir.
- Use the **`debug`** profile to root-cause heisenbug crashes that ASAN perturbs away and that gdb-on-release turns into a hang/timeout — the non-ASAN `-O0 -g3` build reproduces them and gives a fully symbolized backtrace under gdb (how bug-1282/bug-1286 were cracked).
Examples: `/xce-build controller` (ASAN), `/xce-build controller debug` (gdb/core build), `/xce-build all release`.
```bash
COMPONENT="$0"
BUILD_DIR="$1"
PROFILE="$1"
BUILD_DIR="$2"
cd src && \
nix develop --command bash tools/xce-build.sh ${COMPONENT:+$COMPONENT} ${BUILD_DIR:+$BUILD_DIR}
nix develop --command bash tools/xce-build.sh ${COMPONENT:+$COMPONENT} ${PROFILE:+$PROFILE} ${BUILD_DIR:+$BUILD_DIR}
```