1309151 - A reftest 395107-2.html fails on Android on try server if some reftest is added

Status: NEW

(Core :: Layout, defect, P3)

Description

[Hiroyuki Ikezoe (:hiro)]

I am not sure it's worth to filing this bug, but for the record, I am filing this.

In bug 1278136, I was adding bunch of reftests, then surprisingly 395107-2.html failed.  In my understandings, just adding reftest should not affect other reftests.

https://treeherder.mozilla.org/logviewer.html#?job_id=28940843&repo=try

 [task 2016-10-11T07:40:58.039301Z] 07:40:58     INFO -  REFTEST TEST-UNEXPECTED-FAIL | http://10.0.2.2:8854/tests/layout/reftests/bugs/395107-2.html == http://10.0.2.2:8854/tests/layout/reftests/bugs/395107-2-ref.html | image comparison, max difference: 4, number of differing pixels: 2

 [task 2016-10-11T07:40:58.045798Z] 07:40:58     INFO -  REFTEST   IMAGE 1 (TEST): data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAyAAAAPoCAYAAAAmy5qxAAAZ0UlEQVR4nO3d/a+edX3Acf8qf5AoHB5GgSOsYHFWYOiqW5aZuajTrTU62QMyQFm2uSFbN3WLWUQU4wJjWtaSHh5clMmD0I22QBddIodyKI+n/ewHwgmsZeWhvmU7r1dyJff9va+nc+6f3rmu73W/ZQAAACJv+XmfAAAAsH4IEAAAICNAAACAjAABAAAyAgQAAMgIEAAAICNAAACAjAABAAAyAgQAAMgIEAAAICNAAACAzHEDZHl5eZaWlmbHjh2WE7wsLS3N8vJy8T0DAMCbwnEDZGlpaVZWVopzWXdWVlZm165dP+/TAACAzHEDZMeOHcFprF/+vwAArCdvigA5fPjwPPzIo3PkyJGf+bHebAQIAADryRsOkO//4O757JWfm8/8weXz7X+8aVZXD7/mk3jiiZV560mnzDPPPvuatz2eZ555Zr7wl9fN/v0Pn/B9nwgCBACA9eQNBcjNt3xnzjnvXfP1b9w4//TP351f+40Pz7ZPfeZVHfiiS7e8LApWV1df1Xav1Z/82RfmrSedMruX7viZ7P+NEiAAAKwnrztAVldXZ8Pixrn3vvvXxp5//vnZuGnz3PW9f50nDx2apTvunB//+CfzzW99e26/86619XYv3TGnnHHWfPnvvjqPHjgwzz///Nx8y3fm8OEXrp4cOXJkbr/zrrn+hhvn/h89sLbdk4cOzW27l+ax5eW5/oYb57u3/sv/esXlRw88OL+46T3z7osuzQJky5Yts2XLlmNO3F9ZWVn7/EUCBACA9eR1B8jefftnw+LGo8avvPqa+eJf/c3s3bd/Fn7hnPnYJ7bNtddtnwve/d659rrtMzPz9W/cOG8/9cy58upr5oEH9xx1C9YnP33Z/PqHfmv++m+/PBduvmS++g9fWzvmaRsW55Ofvmy2f+kr88u/8qtz+R9ffczzW109PBe/7wNzx53fm0ve/8E0QBYWFmbbtm1HfbZ169ZZWFgQIAAArFuvO0C+f/e/zbvec/FR49det32uuOrzs3ff/nnHaRvm2Wefm5mZh/bum3ectmGefvrpmZk5/axz59//46GZefkckHvuvW/OOe9da7dkPXrgwJx8+lnz1FNPz959++ftp545hw49NTOztu6xfOkrfz9/dMVVMzNpgOzZs2cWFxdnYWFhtm/fvja+ffv2WVhYmMXFxdmzZ8/auAABAGA9ed0Bcs+9983GTZuPGv/zv/jifO6aP127AvJSp5917jz00N6118cKkBu++a356Me3vmy7s8+7YB54cM9R+3z4kUfnHadtOOocHnn0wFy4+ZJ58tChmWkDZGZm165ds7CwMAsLC7Nr166j3r+UAAEAYD153QFy8ODBedvJp89TTz39svGPfWLbXH/DN48dIBveOQ/t3ffC61cIkJtuvmU+9OGPvmy70zYszsMPP/KqA+T3fv/yOfXMxdm4afNs3LR5TjrljDnr3PPn+htuPN6fe8K89IrHsa6IvEiAAACwnryhp2D9zrZPzRVXfX7t9ztu2700GxY3zsGDB2fvvv3ztpNPn0cePTAzM7ffedeccfZ589xzL9ySdfZ5F8x9978wwfylAfKTn/zXnLZhcQ4c+M+Zmbl1522zcdPmWV09/KoD5PDhw7O6urq2XPL+D85tu5fy3xl5cc7HwsLCbN269ZjrCBAAANaTNxQgjz9+cH7zI789Z517/px/4Xvnws2XzA/u/uHMzNp8jY98/Hfn4vd9YM44+7zZcevOtW0v+8PPzoZ3nj87bt151CT0m26+ZRY3bpqLLt0yF/zSRfPDe+5b2+erCZD/qb4F60UvferVsZ6KNSNAAABYX07IL6GvrDw5P33ssZeNvTQWnnhi5ZiPy/3pTx97xasSR44cmccfP3jcY/9fJ0AAAFhPTkiAHMux5oBwNAECAMB68jMLkINPPDFf+/o3Xte264kAAQBgPTlugOzcufMV5y/wxqysrMzOnTuPvyIAAPw/cdwAWV5ent27d8+OHTssJ3jZvXv3LC8vF98zAAC8KRw3QAAAAE4UAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAABARoAAAAAZAQIAAGQECAAAkBEgAA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 [task 2016-10-11T07:40:58.049821Z] 07:40:58     INFO -  REFTEST   IMAGE 2 (REFERENCE): data:image/png;base64,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 [task 2016-10-11T07:40:58.050013Z] 07:40:58     INFO -  REFTEST TEST-END | http://10.0.2.2:8854/tests/layout/reftests/bugs/395107-2.html == http://10.0.2.2:8854/tests/layout/reftests/bugs/395107-2-ref.html

Comment 1

[Hiroyuki Ikezoe (:hiro)]

Oddly the test cases seemed to fail after the change I've made in bug 1278136 was backed out.

Comment 2

[Daniel Holbert [:dholbert]]

This sort of extremely-subtle Android test-failure ("max difference: 4, number of differing pixels: 2") is generally caused by rebucketing -- there must be some test that causes this sort of minor issue in later tests (perhaps by exercising some flaky functionality) -- and adding/removing tests will cause us to shift which tests are in R1 vs R2, etc.

So, test additions/removals can have subtle "effects at a distance" like this.

Targeted "fuzzy-if(Android,...)" annotations are probably the best short-term fix -- like https://hg.mozilla.org/mozilla-central/rev/97a9b83bc394