[Bug 1711337] Re: Firefox crashes at start on armv7L after 55.0.1 update

James Donald 1711337 at bugs.launchpad.net
Mon Mar 19 17:23:14 UTC 2018


> [herrtimson] I wrote an email to Chris Coulson, asking for some
assistance with the cflags. Hopefully he'll read it.

Thanks. I flagged him on #ubuntu-devel IRC as well. Hopefully we'll get
his attention this time.

> > [Chituc] Can you check if the firefox 57.04 trusty , the working one shows
"-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16" in about:buildconfig ?
> [Chris] It’s not showing those flags in about:buildconfig

I don't think this matters, because Firefox 57 Trusty still has the Skia
crash for most armhf users. The main difference between Firefox 57 and
58/59 is that in Firefox 57 it's possible to disable Skia via prefs.js,
but otherwise the misaligned instruction bug is still there.

> it fixes freebsd only, but still it might be helpfull to see what they
changed.

The majority of that patch deals with atomics, compare-and-swap, and
memory barriers, although might be worth noticing that it does add
-march=armv7-a

> [Chituc] Builing on xenial did nto worked but a build in trusty have
great chances to work .

Right, but important to note that building on Bionic will likely work
too. That point may be helpful in getting the Ubuntu team to prioritize.

> CFLAGS="-march=armv7-a -mfloat-abi=hard -mfpu=vfpv3-d16"

In case anyone is testing this soon, be sure to set both CFLAGS and
CXXFLAGS. SkJumper_generated.S is assembly and I'm not sure which of the
two flag sets gets passed, but the Skia project is largely C++.

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Title:
  Firefox crashes at start on armv7L after 55.0.1 update

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