当前位置:首页>自动驾驶>面向 SGLang 的自动驾驶开发SKILLS更新:Serving 排障 SKILLS,如性能异常,CUDA Crash,通信Hang等

面向 SGLang 的自动驾驶开发SKILLS更新:Serving 排障 SKILLS,如性能异常,CUDA Crash,通信Hang等

  • 2026-05-13 10:21:18
面向 SGLang 的自动驾驶开发SKILLS更新:Serving 排障 SKILLS,如性能异常,CUDA Crash,通信Hang等

欢迎关注:https://github.com/BBuf/SGLang-Auto-Driven-SKILLS 用Codex/Claude Code一起自动驾驶SGLang开发。

0x0. 前言

SGLang-Auto-Driven-SKILLS 更新一个新的 SKILLS ,这次更新的的是一个更偏真实 serving 排障的 SKILL:

https://github.com/BBuf/SGLang-Auto-Driven-SKILLS/tree/main/skills/sglang-prod-incident-triage

如果后续合并进 SGLang 主仓,对应目录就是:

https://github.com/sgl-project/sglang/tree/main/.claude/skills/sglang-prod-incident-triage

这个 SKILL 不是替代 torch profilercuda crash debugdistributed hang debug 这些专项技能,而是先把真实服务里的问题收成一条规范路径。这个SKILL之前已经有很多铺垫了,例如debug cuda crash(https://github.com/sgl-project/sglang/tree/main/.claude/skills/debug-cuda-crash) ,debug distributed hang(https://github.com/sgl-project/sglang/tree/main/.claude/skills/debug-distributed-hang),sglang torch profiler analysis(https://github.com/sgl-project/sglang/tree/main/.claude/skills/sglang-torch-profiler-analysis)等等。这个 SKILL 做真实serving排障功能的时候高强度的调用了上面一系列已有SKILL,只是让整个生产环境的排障流程更加清楚,对Agent debug提供更加精准的上下文信息。

整体思路就是:

先保留现场,再 replay 事故,再把问题送进正确的专项技能。

使用的方法就是带上这个SKILL让他帮你去debug你会发生异常的服务,只需要把原始的启动方式和请求方式告诉Agent,接下来抓现场,replay,debug都可以被Agent连贯的接起来。

0x1. Motivation

它的思路很直接:

  • 先抓只读 bundle,不一上来就开 profiler。
  • 先把触发问题的 request 或 crash dump 留下来,不靠手搓 prompt 猜现场。
  • 先 replay,同一个现象能在干净目标上重放出来,后面的 trace、torch profile、cuda coredump、git bisect run 才有意义。
  • 不重复造轮子,后面还是接到现有的 debug-cuda-crashdebug-distributed-hangsglang-torch-profiler-analysis 等等这些SGLang已经有的专用SKILL里。

这个 SKILL 在Ref里面提供了三个例子 :

  • TTFT 异常,但 queue time 很低
  • 请求链路里的 CUDA Crash(一个真实的生产场景发生的问题)
  • 多卡 TP 通信 Hang

0x2. Examples

主要展示一下会正确触发这个SKILL的排障流程,更细节的信息就没贴了,用Codex和GPT5.4 xHigh在H200复现确实可以找到每个bug发生的具体代码位置。

0x2.1 TTFT 异常,但 queue 不是主因

TTFT Down

先看现场信号,不要先入为主:

Health: /health=ok /health_generate=ok
Point-in-time load: running=1 waiting=0 total=1 token_usage=0.410 throughput=29.800 cache_hit_rate=0.970
Metrics: requests=2 prompt_tokens=1540 generation_tokens=128 avg_ttft_s=3.210 avg_e2e_s=4.150 avg_queue_s=0.030
Stage Averages (max across TP ranks): prefill_forward=2.900s, request_process=0.090s

waiting=0avg_queue_s=0.030prefill_forward=2.900s

这一步已经足够说明:

  • 不是 queue pressure 在顶着
  • 更像 prefill-side compute 或 request path slowdown

规范路径就是:

baseline bundle
  -> save the slow request
  -> replay the same request
  -> trace / torch profile

0x2.2 CUDA Crash:挂掉的 kernel,不一定是根因 kernel

Crash

这个例子不是写一个孤立 kernel 小 demo,而是故意把脏数据写在上游 routing kernel 里,让下游 moe_align_block_size_kernel 真正挂掉。来自真正的生产例子:https://zhuanlan.zhihu.com/p/1984750078074839122

你最后看到的现场输出会更像这样:

RuntimeError: Triton Error [CUDA]: an illegal memory access was encountered
Dumped 1 finished and 1 unfinished requests before crash to /tmp/.../crash_dump_2026-04-20_14-23-15.pkl
CUDA Exception: Warp Out-of-range Address
#0 0x7f7fe1dfac00 _Z27moe_align_block_size_kernelIiEvPKT_PiS3_S3_iimS3_bii

faulting kernel = moe_align_block_size_kernelroot cause kernel = topkGatingSoftmax

整体流程是:

  • crash dump 先把真实 request mix 留了下来
  • replay 能把 crash 重新打出来
  • cuda-gdb 指向的是下游 faulting kernel
  • 但真正写脏数据的是上一个 routing kernel

规范路径就是:

crash dump
  -> summarize dump
  -> replay
  -> CUDA coredump
  -> cuda-gdb
  -> walk one kernel upstream

0x2.3 通信 Hang:先 replay 事故,再做 distributed hang 深挖

Hang

这个例子是故意让真实 request 链路里的 TP collective mismatch 把服务挂住。触发 request 很简单:

"hello " * 768
prompt_tokens = 769

服务日志里先会看到:

Prefill batch, #new-seq: 1, #new-token: 769, #cached-token: 0

重放期间再抓现场,bundle 会开始变坏:

health.txt.error.json:
  TimeoutError: timed out

health_generate.txt.error.json:
  TimeoutError: timed out

loads_all.json:
  ConnectionResetError: [Errno 104] Connection reset by peer

loads_core_queues_disagg.json:
  URLError: <urlopen error [Errno 111] Connection refused>

再往后,watchdog / py-spy 会落到这种路径:

cuEventSynchronize
cudaEventSynchronize
synchronize (torch/cuda/streams.py:231)
process_batch_result_prefill
process_batch_result
event_loop_overlap

服务 baseline 时是健康的同一个 trigger request 可以 replaycontrol plane 是在 replay 挂住之后才开始退化的

规范路径就是:

baseline bundle
  -> save the trigger request
  -> replay on a clean target
  -> collect replay-time bundle
  -> watchdog / py-spy
  -> debug-distributed-hang

0x3. 总结

这个 SKILL 真正有用的地方,不是“帮你查一个 kernel”,而是把真实 serving 里的慢、crash、hang 统一成:

先抓现场,先 replay,再决定后面该进 trace、性能 profile、cuda coredump,还是直接 bisect。

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  1. CONNECT:[ UseTime:0.000522s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000864s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000363s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000521s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000521s ]
  8. SELECT * FROM `article` WHERE `id` = 496565 LIMIT 1 [ RunTime:0.000520s ]
  9. UPDATE `article` SET `lasttime` = 1779332104 WHERE `id` = 496565 [ RunTime:0.000741s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000226s ]
  11. SELECT * FROM `article` WHERE `id` < 496565 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000448s ]
  12. SELECT * FROM `article` WHERE `id` > 496565 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000383s ]
  13. SELECT * FROM `article` WHERE `id` < 496565 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001137s ]
  14. SELECT * FROM `article` WHERE `id` < 496565 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000673s ]
  15. SELECT * FROM `article` WHERE `id` < 496565 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001466s ]
0.075887s