Intermitten timeout in /_webgl/conformance/glsl/bugs/long-expressions-should-not-crash.html, /_webgl/conformance/glsl/bugs/complex-glsl-does-not-crash.html

[jdm]

  ▶ TIMEOUT [expected CRASH] /_mozilla/webgl/conformance-1.0.3/conformance/glsl/bugs/long-expressions-should-not-crash.html
  │ 
  │ VMware, Inc.
  │ softpipe
  │ 3.3 (Core Profile) Mesa 17.3.0-devel
  │ 
  │ test: shader with 10 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 10 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 10 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [+,-,/,*] operators in expression in one line
  │ PASS shader with 10 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 10 [+,-,/,*] operators in expression in one line
  │ PASS shader with 10 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 10 [+] operators in expression in multiple lines
  │ PASS shader with 10 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [+] operators in expression in multiple lines
  │ PASS shader with 10 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [+] operators in expression in one line
  │ PASS shader with 10 [+] operators in expression in one line
  │ 
  │ test: shader with 10 [+] operators in expression in one line
  │ PASS shader with 10 [+] operators in expression in one line
  │ 
  │ test: shader with 10 [-] operators in expression in multiple lines
  │ PASS shader with 10 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [-] operators in expression in multiple lines
  │ PASS shader with 10 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 10 [-] operators in expression in one line
  │ PASS shader with 10 [-] operators in expression in one line
  │ 
  │ test: shader with 10 [-] operators in expression in one line
  │ PASS shader with 10 [-] operators in expression in one line
  │ 
  │ test: shader with 100 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 100 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 100 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [+,-,/,*] operators in expression in one line
  │ PASS shader with 100 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 100 [+,-,/,*] operators in expression in one line
  │ PASS shader with 100 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 100 [+] operators in expression in multiple lines
  │ PASS shader with 100 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [+] operators in expression in multiple lines
  │ PASS shader with 100 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [+] operators in expression in one line
  │ PASS shader with 100 [+] operators in expression in one line
  │ 
  │ test: shader with 100 [+] operators in expression in one line
  │ PASS shader with 100 [+] operators in expression in one line
  │ 
  │ test: shader with 100 [-] operators in expression in multiple lines
  │ PASS shader with 100 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [-] operators in expression in multiple lines
  │ PASS shader with 100 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 100 [-] operators in expression in one line
  │ PASS shader with 100 [-] operators in expression in one line
  │ 
  │ test: shader with 100 [-] operators in expression in one line
  │ PASS shader with 100 [-] operators in expression in one line
  │ 
  │ test: shader with 1000 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 1000 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 1000 [+,-,/,*] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [+,-,/,*] operators in expression in one line
  │ PASS shader with 1000 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 1000 [+,-,/,*] operators in expression in one line
  │ PASS shader with 1000 [+,-,/,*] operators in expression in one line
  │ 
  │ test: shader with 1000 [+] operators in expression in multiple lines
  │ PASS shader with 1000 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [+] operators in expression in multiple lines
  │ PASS shader with 1000 [+] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [+] operators in expression in one line
  │ PASS shader with 1000 [+] operators in expression in one line
  │ 
  │ test: shader with 1000 [+] operators in expression in one line
  │ PASS shader with 1000 [+] operators in expression in one line
  │ 
  │ test: shader with 1000 [-] operators in expression in multiple lines
  │ PASS shader with 1000 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [-] operators in expression in multiple lines
  │ PASS shader with 1000 [-] operators in expression in multiple lines
  │ 
  │ test: shader with 1000 [-] operators in expression in one line
  │ PASS shader with 1000 [-] operators in expression in one line
  │ 
  │ test: shader with 1000 [-] operators in expression in one line
  │ PASS shader with 1000 [-] operators in expression in one line
  │ 
  │ test: shader with 10000 [+,-,/,*] operators in expression in multiple lines
  │ PASS shader with 10000 [+,-,/,*] operators in expression in multiple lines
  │ 
  └ test: shader with 10000 [+,-,/,*] operators in expression in multiple lines

[anholt]

I think #19129 will fix this by avoiding the stack overflow.