129822 2014-03-06 13:13:55 -0800 REGRESSION(r165196): broke arm64 on hardware (Requested by bfulgham on #webkit). 2014-03-07 14:36:41 -0800 1 1 1 Unclassified WebKit New Bugs 528+ (Nightly build) Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 129806 1 commit-queue commit-queue bfulgham fpizlo msaboff oldest_to_newest 987828 0 commit-queue 2014-03-06 13:13:55 -0800 http://trac.webkit.org/changeset/165196 broke the build: broke arm64 on hardware (Requested by bfulgham on #webkit). This is an automatic bug report generated by webkitbot. If this bug report was created because of a flaky test, please file a bug for the flaky test (if we don't already have one on file) and dup this bug against that bug so that we can track how often these flaky tests fail. 987830 1 226030 commit-queue 2014-03-06 13:14:09 -0800 Created attachment 226030 ROLLOUT of r165196 Any committer can land this patch automatically by marking it commit-queue+. The commit-queue will build and test the patch before landing to ensure that the rollout will be successful. This process takes approximately 15 minutes. If you would like to land the rollout faster, you can use the following command: webkit-patch land-attachment ATTACHMENT_ID where ATTACHMENT_ID is the ID of this attachment. 987831 2 bfulgham 2014-03-06 13:15:17 -0800 Not committing yet. Trying this change locally to see if it indeed corrects the arm64 failure on hardware. 987859 3 bfulgham 2014-03-06 14:26:06 -0800 This was the culprit. 987861 4 226030 commit-queue 2014-03-06 14:28:01 -0800 Comment on attachment 226030 ROLLOUT of r165196 Clearing flags on attachment: 226030 Committed r165216: <http://trac.webkit.org/changeset/165216> 987862 5 commit-queue 2014-03-06 14:28:03 -0800 All reviewed patches have been landed. Closing bug. 988026 6 fpizlo 2014-03-06 21:20:13 -0800 This makes no sense. The original patch, as well as the rollout, has no functional effect on the system unless you enable the FTL. The FTL is not enabled on ARM64. When the FTL is enabled, this patch fixes bugs. Tests pass with this patch applied. This feels like a fluke. This rollout is blocking further work on the FTL, and I cannot reproduce the crash. 988044 7 bfulgham 2014-03-06 22:43:38 -0800 (In reply to comment #6) > This makes no sense. The original patch, as well as the rollout, has no functional effect on the system unless you enable the FTL. The FTL is not enabled on ARM64. When the FTL is enabled, this patch fixes bugs. > > Tests pass with this patch applied. > > This feels like a fluke. This rollout is blocking further work on the FTL, and I cannot reproduce the crash. Let's avoid relying on feelings, and deal in observable behavior. The patch reproducibly broke mobile safari, and rolling out the patch cleared the problem. Perhaps the failure is not observable using the JSC test suite, or perhaps is not observable in simulated environments. Perhaps our default build is somehow enabling FTL when building for hardware. If tests did pass on hardware, there must be significant behavior that is not modeled by the test suite. 988172 8 fpizlo 2014-03-07 08:34:55 -0800 (In reply to comment #7) > (In reply to comment #6) > > This makes no sense. The original patch, as well as the rollout, has no functional effect on the system unless you enable the FTL. The FTL is not enabled on ARM64. When the FTL is enabled, this patch fixes bugs. > > > > Tests pass with this patch applied. > > > > This feels like a fluke. This rollout is blocking further work on the FTL, and I cannot reproduce the crash. > > Let's avoid relying on feelings, and deal in observable behavior. The patch reproducibly broke mobile safari, and rolling out the patch cleared the problem. > > Perhaps the failure is not observable using the JSC test suite, or perhaps is not observable in simulated environments. Perhaps our default build is somehow enabling FTL when building for hardware. > > If tests did pass on hardware, there must be significant behavior that is not modeled by the test suite. I don't doubt that there is something wrong. I cannot delve deeper into it because I'm on vacation. What I do know is that: - The patch changes code that was added for the FTL and my understanding of the code is that it shouldn't be in use if the FTL is disabled. If it is in use, then something is very suspicious. - I tested on arm64 hardware with and without FTL. It's true that I only ran the JSC test suite. 988186 9 bfulgham 2014-03-07 09:13:36 -0800 <rdar://problem/16251450> 988292 10 msaboff 2014-03-07 13:09:36 -0800 (In reply to comment #9) > <rdar://problem/16251450> I applied change set http://trac.webkit.org/changeset/165196 to ToT r165273 and tried both a debug and release build on an ARM64 device and had no problems with crashing on http://daringfireball.net or various other common sites. Brent is going to build with the change set and see if it reproduces for him. I'm going to prepare a patch to roll the change back in. 988359 11 bfulgham 2014-03-07 14:36:41 -0800 (In reply to comment #10) > (In reply to comment #9) > > <rdar://problem/16251450> > > I applied change set http://trac.webkit.org/changeset/165196 to ToT r165273 and tried both a debug and release build on an ARM64 device and had no problems with crashing on http://daringfireball.net or various other common sites. > > Brent is going to build with the change set and see if it reproduces for him. I'm going to prepare a patch to roll the change back in. I did a full rebuild after updating to today's tool, and doing a full clean install of the OS image (i.e., not an "upgrade") and everything works. 226030 2014-03-06 13:14:09 -0800 2014-03-06 14:28:00 -0800 ROLLOUT of r165196 bug-129822-20140306131408.patch text/plain 14598 commit-queue U3VidmVyc2lvbiBSZXZpc2lvbjogMTY1MjA2CmRpZmYgLS1naXQgYS9Tb3VyY2UvSmF2YVNjcmlw dENvcmUvQ2hhbmdlTG9nIGIvU291cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwppbmRleCAw OWQ2YTJiODkxM2E1M2RkN2UzNWI4NGEwM2U5YWJlMGJmNTIwZDhjLi41MTBjYmE1OThhYWU0NWM2 YTdmMWEwNzY3ZTE1NTUyMTQxMjRkNDIwIDEwMDY0NAotLS0gYS9Tb3VyY2UvSmF2YVNjcmlwdENv cmUvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKQEAgLTEs MyArMSwyOSBAQAorMjAxNC0wMy0wNiAgQ29tbWl0IFF1ZXVlICA8Y29tbWl0LXF1ZXVlQHdlYmtp dC5vcmc+CisKKyAgICAgICAgVW5yZXZpZXdlZCwgcm9sbGluZyBvdXQgcjE2NTE5Ni4KKyAgICAg ICAgaHR0cDovL3RyYWMud2Via2l0Lm9yZy9jaGFuZ2VzZXQvMTY1MTk2CisgICAgICAgIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD0xMjk4MjIKKworICAgICAgICBicm9r 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