[Webkit-unassigned] [Bug 229321] New: REGRESSION(r274166): [GTK] It broke run-javascriptcore-tests causing all tests to use lot of memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=229321

            Bug ID: 229321
           Summary: REGRESSION(r274166): [GTK] It broke
                    run-javascriptcore-tests causing all tests to use lot
                    of memory
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: clopez at igalia.com
                CC: bugs-noreply at webkitgtk.org, don.olmstead at sony.com,
                    mcatanzaro at gnome.org

The GTK JSC bot <https://build.webkit.org/#/builders/GTK-Linux-64-bit-Release-JS-Tests> has been failing for a long time, with crashes on all tests caused by two much memory usage.

Example:

basic-tests.yaml/stress-test.js.no-ftl: Running mandatory iteration #1:
basic-tests.yaml/stress-test.js.no-ftl: Crashing because current footprint: 633380864 exceeds limit: 629145600
basic-tests.yaml/stress-test.js.no-ftl: 1   0x55762feeb519 WTFCrash
basic-tests.yaml/stress-test.js.no-ftl: 2   0x55762ff90513 ../../../.vm/JavaScriptCore.framework/Helpers/jsc(+0xcd513) [0x55762ff90513]
basic-tests.yaml/stress-test.js.no-ftl: 3   0x55762ff1164a ../../../.vm/JavaScriptCore.framework/Helpers/jsc(+0x4e64a) [0x55762ff1164a]
basic-tests.yaml/stress-test.js.no-ftl: 4   0x55762ff87a89 ../../../.vm/JavaScriptCore.framework/Helpers/jsc(+0xc4a89) [0x55762ff87a89]
basic-tests.yaml/stress-test.js.no-ftl: 5   0x7fb909d4b4d2 /usr/lib/x86_64-linux-gnu/libpthread.so.0(+0x84d2) [0x7fb909d4b4d2]
basic-tests.yaml/stress-test.js.no-ftl: 6   0x7fb908086323 clone
basic-tests.yaml/stress-test.js.no-ftl: test_script_693: line 2: 11836 Segmentation fault      (core dumped) ( "$@" ../../../.vm/JavaScriptCore.framework/Helpers/jsc --useFTLJIT\=false --useFunctionDotArguments\=true --validateExceptionChecks\=true --useDollarVM\=true --maxPerThreadStackUsage\=1572864 stress-test.js )
basic-tests.yaml/stress-test.js.no-ftl: ERROR: Unexpected exit code: 139


I have bisected this and the cause is r274166, also I have double-checked that by reverting locally this commit the issue is fixed.

The problem can be easily reproduced with this command:

Tools/Scripts/run-javascriptcore-tests --gtk --release --memory-limit --verbose --no-testb3 --no-testapi 

Then almost all the JSC tests starts crashing due to trying to use more than the memory limit (which is 600 MB when passing --memory-limit) with a log like the above one.
Notes:
 - If you don't pass --memory-limit then your machine may crash due to OOM
 - Passing --no-testb3 and --no-testapi is needed to avoid also an OOM crash because the testb3 and testapi tests don't seem to honour the --memory-limit switch


The issue is not happening on WPE, only on GTK

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