1 files changed, 114 insertions, 0 deletions
diff --git a/results/classifier/118/all/1832281 b/results/classifier/118/all/1832281
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+++ b/results/classifier/118/all/1832281
@@ -0,0 +1,114 @@
+TCG: 0.992
+network: 0.989
+socket: 0.987
+vnc: 0.985
+user-level: 0.983
+architecture: 0.982
+device: 0.979
+ppc: 0.969
+performance: 0.965
+VMM: 0.963
+debug: 0.952
+virtual: 0.935
+arm: 0.934
+files: 0.933
+graphic: 0.931
+peripherals: 0.931
+permissions: 0.929
+PID: 0.926
+x86: 0.910
+kernel: 0.884
+semantic: 0.879
+mistranslation: 0.869
+boot: 0.868
+risc-v: 0.857
+register: 0.796
+hypervisor: 0.769
+KVM: 0.714
+i386: 0.653
+assembly: 0.409
+
+tcg bug master / 4.0.0 v8 operation >>> and |=
+
+vm guest is linux, executed with tcg
+running this Node.js snippet leads to
+
+$ node
+> a = undefined 
+undefined
+> a >>> 0
+4294967295
+
+host node
+$ node
+> a = undefined
+undefined
+> a >>> 0
+0
+
+same with |=
+
+node
+Welcome to Node.js v12.4.0.
+Type ".help" for more information.
+> let buffer
+undefined
+> buffer |= 0
+0
+
+vm with tcg:
+
+$ ./out/Release/node --version
+v12.4.0
+./out/Release/node -e "let buffer; buffer |= 0; console.log(buffer);"
+-1
+
+
+vm guest is debian x86_64 latest release
+vm guest is started with ./x86_64-softmmu/qemu-system-x86_64 -vnc :0 -cdrom debian-9.9.0-amd64-netinst.iso -m 4G -smp cores=6,threads=1,sockets=1 -nic user,hostfwd=tcp:ipv4addr:2233-:22 -cpu qemu64 debian.img
+
+git tag v4.0.0 and master, commit a578cdfbdd8f9beff5ced52b7826ddb1669abbbf, for building qemu-system-x86_64 was used.
+
+Node.js as compiled on the vm guest (v12.4.0 / master)
+
+
+see also
+https://github.com/nodejs/node/issues/19348#issuecomment-500465502
+
+I need further assistance to track down the cause of the bug.
+
+Kind regards
+Manuel
+
+This might be the same underlying problem as LP:1815423 which also mentions some issues with Javascript calculations involving arithmetic operations on a js "undefined" value. That bug has a C-only reproduce case so is probably a good place to start for anybody interesting in investigating and fixing it.
+
+
+https://<email address hidden>/ is a patch which I think probably fixes this bug -- could you test it? (I don't have an x86 vm with node.js in it to test with.)
+
+Hi Peter,
+
+I will try the tag and report back.
+
+result:
+
+node
+Welcome to Node.js v12.4.0.
+Type ".help" for more information.
+> a = undefined
+undefined
+> a >>> 0
+0
+> let buffer
+undefined
+> buffer |= 0
+0
+
+
+Thanks for the patch :-)
+
+Thanks a lot for testing it!
+
+
+Patch had been included here:
+https://git.qemu.org/?p=qemu.git;a=commitdiff;h=1e8a98b53867f61da9c
+