SIGSEGV fault when running newton CGI interface

[janithpet]

Describe the bug After fixing Issues #615, #616 and #617, and compiling, running the webtool generates the following text in red, on the top of the page:

⚠    Web interface to compiler halted the computation (WcgiAsync). Memory or CPU usage limit exceeded or other asynchronous error.

See screenshot below for how it is seen on the webpage.

This text is caused by the signal handler timeoutSignalHandler in src/newton/cgimain.c. By adding a write statement on line 116, to print the signal code that caused the error, we can see that it is a SIG-11 (SIGSEGV).

To Reproduce Steps to reproduce the behavior; this assumes that Apache2 is setup, with cgi modules enabled on your machine:

1. Clone repo using git clone --recursive git@github.com:phillipstanleymarbell/Noisy-lang-compiler.git
2. Create config.local in root directory, and submodules/libflex. config.local looks like:

   LIBFLEXPATH=<path-to-repo>/Noisy-lang-compiler/submodules/libflex
   CONFIGPATH=<path-to-repo>/home/janith/Noisy-lang-compiler/submodules/libflex
   OSTYPE=linux
   MACHTYPE=x86_64

3. run make in submodules/libflex.
4. run mkdir icons in src/. This is a temporary fix for Issue-#616. See note below.
5. run sudo cp NewtonBaseSignals.nt /usr/bin/cgi-bin/ from src/newton. This is a temporary fix for Issue-#617.
6. run make installcgi in src/newton.
7. run

   wget http://code.jquery.com/jquery-git.js /tmp/
   sudo cp /tmp/jquery-git.js /var/www/html/tmp/

   and

   git clone https://github.com/ajaxorg/ace-builds.git /tmp/ace-builds
   sudo cp -r /tmp/ace-builds/src-noconflict /var/www/html/tmp/

8. On a browser, go to localhost/cgi-bin/newtoncgi-linux-EN/?c=.

Host OS (please complete the following information):

• OS: Ubuntu 22.04 LTS (from lsb_release -a)
  • Clang: 11.1.0-6; Target: x86_64-pc-linux-gnu (from clang --version)
  • GCC: 11.2.0-19ubuntu1 (from gcc --version)

Your local changes (please complete the following information):

• Output of git diff (to fix Issue-#615):

  
  diff --git a/src/newton/Makefile b/src/newton/Makefile
  index 292acf2bf..ef297265a 100644
  --- a/src/newton/Makefile
  +++ b/src/newton/Makefile
  @@ -165,7 +165,6 @@ CGIOBJS             =\
              newton-irPass-LLVMIR-liveness-analysis.$(OBJECTEXTENSION)\
              newton-irPass-invariantSignalAnnotation.$(OBJECTEXTENSION)\
              newton-irPass-piGroupsSignalAnnotation.$(OBJECTEXTENSION)\

• newton-irPass-estimatorSynthesisBackend/$(OBJECTEXTENSION)\ newton-irPass-ipsaBackend.$(OBJECTEXTENSION)\ newton-irPass-dimensionalMatrixAnnotation.$(OBJECTEXTENSION)\ newton-irPass-dimensionalMatrixPiGroups.$(OBJECTEXTENSION)\

• Output of git remote -v:

  origin  git@github.com:phillipstanleymarbell/Noisy-lang-compiler.git (fetch)
  origin  git@github.com:phillipstanleymarbell/Noisy-lang-compiler.git (push)

Additional Notes

• the steps in To Reproduce set up the apache2 server on localhost.
• Step 4. in To Reproduce will not copy any icons; thus,

[janithpet]

The following changes to cgimain.c seem to fix this issue.

--- a/src/newton/cgimain.c
+++ b/src/newton/cgimain.c
@@ -372,10 +372,10 @@ main(void)
        sigaction(SIGVTALRM, &sa, NULL);

-       newtonCgiState = init(kCommonModeDefault|kCommonModeCallStatistics/* | kCommonModeCallTracing */|kCommonModeCGI);
-       newtonCgiDimensionsState = init(kCommonModeDefault|kCommonModeCallStatistics/* | kCommonModeCallTracing */|kCommonModeCGI);
+       newtonCgiState = init(kCommonModeDefault/*|kCommonModeCallStatistics | kCommonModeCallTracing */|kCommonModeCGI);
+       newtonCgiDimensionsState = init(kCommonModeDefault/*|kCommonModeCallStatistics | kCommonModeCallTracing */|kCommonModeCGI);
        timestampsInit(newtonCgiState);
-
+       timestampsInit(newtonCgiDimensionsState);

        /*
         *      Extra \n, to send the blank line:

I will make a PR with these changes.