[Webkit-unassigned] [Bug 176361] New: REGRESSION(r221601/221602/221607?): It broke all JSC tests on ARMv7 traditional platform

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176361

            Bug ID: 176361
           Summary: REGRESSION(r221601/221602/221607?): It broke all JSC
                    tests on ARMv7 traditional platform
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Blocker
          Priority: P1
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ossy at webkit.org
                CC: fpizlo at apple.com, keith_miller at apple.com,
                    sbarati at apple.com, ticaiolima at gmail.com,
                    utatane.tea at gmail.com
            Blocks: 108645, 172765, 170007, 175396, 176317

before:
- r221599
- https://build.webkit.org/builders/JSCOnly%20Linux%20ARMv7%20Traditional%20Release/builds/1360
- 46 failures

after:
- r221607
- https://build.webkit.org/builders/JSCOnly%20Linux%20ARMv7%20Traditional%20Release/builds/1361
- 25034 failures

JSC changes in this interval:
- https://trac.webkit.org/changeset/221607/webkit (Saam, r=Keith)
- https://trac.webkit.org/changeset/221602/webkit (Saam, r=Filip)
- https://trac.webkit.org/changeset/221601/webkit (Yusuke, r=Keith)

I don't have any time and any interest to debug or fix this issue,
I just reported because I noticed it on the buildbot, maybe anyone
else is interested in fixing an ARMv7 bug (with the traditional
assembler which emits ARM instrucionts instead of Thumbs). Maybe
Caio or someone else from Igalia is interested in it, because I'm
pretty sure that the ARMv6 backend is affected too.

I can help you only a little bit, I can trigger force builds 
on the bot to be able to determine which change is the culprit
from the above 3 JSC chages.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=108645
[Bug 108645] [meta] ARM related bugs
https://bugs.webkit.org/show_bug.cgi?id=170007
[Bug 170007] [DFG][FTL] Efficiently execute number#toString()
https://bugs.webkit.org/show_bug.cgi?id=172765
[Bug 172765] [meta][JSC][ARMv6] Support ARMv6 architecture in LLInt and JIT layers
https://bugs.webkit.org/show_bug.cgi?id=175396
[Bug 175396] Support compiling catch in the FTL
https://bugs.webkit.org/show_bug.cgi?id=176317
[Bug 176317] typeCheckHoistingPhase may emit a CheckStructure on the empty value which leads to a dereference of zero on 64 bit platforms
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