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SIGSEGV sending a puppy Response object down a Channel with --gc:orc #18950

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oakes opened this issue Oct 4, 2021 · 0 comments
Open

SIGSEGV sending a puppy Response object down a Channel with --gc:orc #18950

oakes opened this issue Oct 4, 2021 · 0 comments

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@oakes
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oakes commented Oct 4, 2021 •
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I made a simple program that launches a worker thread that is supposed to make requests with puppy and send the response down a channel. It fails with a SIGSEGV on the latest devel when gc:orc is enabled.

Example

Install the latest puppy via nimble install puppy and then save the following to chtest.nim:

import puppy

type
  Action = object
    request: Request
    response: ptr Channel[Response]
  Client = ref object
    requestThread: Thread[Client]
    action: ptr Channel[Action]

proc recvAction(client: Client) {.thread.} =
  while true:
    let action = client.action[].recv()
    action.response[].send(fetch(action.request))

proc start*(client: var Client) =
  client.action = cast[ptr Channel[Action]](
    allocShared0(sizeof(Channel[Action]))
  )
  client.action[].open()
  createThread(client.requestThread, recvAction, client)

var c = Client()
start(c)

let res = cast[ptr Channel[Response]](
  allocShared0(sizeof(Channel[Response]))
)
res[].open()
c.action[].send(Action(request: Request(url: parseUrl("http://tired.com"), verb: "get"), response: res))
echo res[].recv()[]

Then run it with:

nim c -r --threads:on --gc:orc chtest.nim

Current Output

/home/sekao/.choosenim/toolchains/nim-#version-1-6/lib/pure/strutils.nim(368) fetch
SIGSEGV: Illegal storage access. (Attempt to read from nil?)

(this is on linux....output differs on mac OS and windows)

Expected Output

(url: http://tired.com, headers: @[(key: "Date", value: "Mon, 04 Oct 2021 19:44:19 GMT"), (key: "Server", value: "Apache/2.2.16 (Debian)"), (key: "Last-Modified", value: "Mon, 29 Sep 2003 08:34:25 GMT"), (key: "ETag", value: "\"3d7130-b8-3c873c3fc0640\""), (key: "Accept-Ranges", value: "bytes"), (key: "Vary", value: "Accept-Encoding"), (key: "Content-Encoding", value: "gzip"), (key: "Content-Length", value: "154"), (key: "Content-Type", value: "text/html")], code: 200, body: "<HTML>\n<HEAD>\n<TITLE>Are you tired?</TITLE>\n</HEAD>\n<BODY BGCOLOR=#FFFFFF>\n<PRE>\n<CENTER>\n\n\n\nAre you tired?\n\nTell <a href=\"mailto:tired@tired.com\">us</a> why.\n</CENTER>\n</PRE>\n</BODY>\n", error: "")

$ nim -v
Nim Compiler Version 1.5.1 [Linux: amd64]
Compiled at 2021-10-04
Copyright (c) 2006-2021 by Andreas Rumpf

active boot switches: -d:release

I also tried nim 1.4.8 with similar results...
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@oakes