[Webkit-unassigned] [Bug 213307] REGRESSION(r263035): stress/get-prototype-of.js broken on s390x

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213307

Michael Catanzaro <mcatanzaro at gnome.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |shvaikalesh at gmail.com
           See Also|                            |https://bugs.webkit.org/sho
                   |                            |w_bug.cgi?id=157972
            Summary|REGRESSION(r263018-r263135) |REGRESSION(r263035):
                   |:                           |stress/get-prototype-of.js
                   |stress/get-prototype-of.js  |broken on s390x
                   |broken on s390x             |

--- Comment #2 from Michael Catanzaro <mcatanzaro at gnome.org> ---
OK, well turns out there is no need to bisect it: the problem is that the test is brand new. :P Should have checked for that first. So, from the backtrace, we can see the failing check is this one:

assert(getPrototypeOf(proxy) === proxyPrototype);

And here we reach the limit of my nonexistent JSC knowledge: I cannot begin to guess why getPrototypeOf(proxy) is not returning the expected result.k A few things I do know: s390x uses cloop only, so we can eliminate the entire JIT as a source of problems. (The tests are run with --no-jit.) It also uses 4 KB page size, which is nice as that eliminates potential for trouble there. The only major difference from x86_64/aarch64 likely to introduce software bugs is that s390x is big-endian, so it's likely that the bug is an endianness problem... somewhere. All other JSC stress tests are passing except for this new one (and memory-limited tests, since we run tests with --memory-limited).

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