SIGSEGV: Illegal storage access. (Attempt to read from nil?)

[lost22git]

• os

WSL2 Debian 12

• code

import prologue

proc hello*(ctx: Context) {.async.} =
  resp "<h1>Hello, Prologue!</h1>"

let app = newApp()
app.get("/", hello)
app.run()

• nimble file

# Package

version       = "0.1.0"
author        = "lost22git"
description   = "A new awesome nimble package"
license       = "MIT"
srcDir        = "src"
bin           = @["test_prologue"]


# Dependencies

requires "nim >= 2.0.0", "prologue >= 0.6.4"

• build and run

nimble build -d:release
./test_prologue

• wrk test

ulimt -n 1000000
wrk -c 10000 -d 30s http://localhost:8080

• error message

DEBUG Prologue is serving at http://0.0.0.0:8080
DEBUG Starting 16 threads
DEBUG Listening on port 8080
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Segmentation fault

[ahungry]

I just got the exact same error on Arch using siege for concurrency testing - same nim + prologue versions, and same test code 😆

[ahungry]

I downgraded some deps:

nim = 1.6.0
prologue = 0.5.0

No more error - a prologue downgrade didn't fix the issue, so I'm thinking it's something in the nim 2.0 (I'll try the last non 2.0 version for comparison with the latest prologue possible).

[ahungry]

I also noticed the (per request) DEBUG log does not show on nim 2.0 either - only the boot up message does.

[ahungry]

These versions do not produce the issue:

requires "nim == 1.6.14"
requires "prologue == 0.6.4" 

[ahungry]

https://github.com/nim-lang/Nim/issues?q=is%3Aissue+is%3Aopen+sigsegv+ - looks like a lot of this in 2.0 release usage.

[ahungry]

Maybe helpful to prologue, httpbeast is having a similar issue: nim-lang/Nim#21422

[ahungry]

One stack trace mentioned httpx for me - and if I use -d:usestd, I no longer receive the error (on nim 2.0) - so I'm guessing this is something httpx is doing incorrectly.

[ahungry]

I updated httpx issue here: ringabout/httpx#33 with a link to the httpbeast solution - I think httpx needs to incorporate it from httpbeast HEAD, add a new tag, then include the new tag on prologue.

[ringabout]

Another workaround is to use --mm:refc.