1653535 - Crash in [@ arena_dalloc | ots::ValidateCFFCharStrings]

Status: RESOLVED WORKSFORME

(Core :: Graphics: Text, defect)

Description

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

Passing this along from https://www.reddit.com/r/firefox/comments/hsjmgw/got_an_email_asking_me_try_out_firefox_vpn/

They say it reproducibly crashes.

This bug is for crash report bp-f7f3bec7-cd9e-47ff-a922-726070200716.

Top 10 frames of crashing thread:

0 firefox arena_dalloc /build/firefox-k3d8Rk/firefox-78.0.2+build2/memory/build/mozjemalloc.cpp:3363
1 libxul.so ots::ValidateCFFCharStrings /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/cff_charstring.cc:1012
2 libxul.so ots::OpenTypeCFF::Parse /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/cff.cc:1262
3 libxul.so ots::Font::ParseTable /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/ots.cc:940
4 libxul.so  /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/ots.cc:692
5 libxul.so  /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/ots.cc:254
6 libxul.so ots::OTSContext::Process /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/ots/src/ots.cc:1099
7 libxul.so gfxUserFontEntry::SanitizeOpenTypeData /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/thebes/gfxUserFontSet.cpp:179
8 libxul.so gfxUserFontEntry::StartPlatformFontLoadOnBackgroundThread /build/firefox-k3d8Rk/firefox-78.0.2+build2/gfx/thebes/gfxUserFontSet.cpp:605
9 libxul.so mozilla::detail::RunnableMethodImpl<gfxUserFontEntry*, void  /build/firefox-k3d8Rk/firefox-78.0.2+build2/obj-x86_64-linux-gnu/dist/include/nsThreadUtils.h:1237

Comment 1

[Jonathan Kew [:jfkthame]]

What's the actual URL of the page where it crashes? I didn't see that in the reddit thread (but may have missed it...)

Comment 2

[Jonathan Kew [:jfkthame]]

FWIW, https://vpn.mozilla.org loads fine for me on both macOS and Linux (but maybe that isn't the page that's crashing for them).

One possible thing to try would be setting gfx.downloadable_fonts.sanitize_omt to false, and see if that makes any difference.

Comment 3

[Asif Youssuff]

User says that they see this issue in https://click.e.mozilla.org/?qs=f3c417d5f6aee57629b550cb717b34cd9e9b46c87fcdde48e965f4296485801ba77e8a3c55d2b8f0cf42e82af7c5c7b88dfe8e557ae67de8

Comment 4

[Jessie [:jbonisteel] pls NI]

I tracked down the URL:

https://vpn.mozilla.org/?utm_medium=email&utm_source=2020vpnwaitlist-en&utm_campaign=july2020&utm_content=vpn

It does not crash for me on MacOS.

Andrei - can someone from QA try out this URL on different platforms and see if it crashes for them?

Comment 5

[Jonathan Kew [:jfkthame]]

That page uses two CFF @font-face resources:

• https://vpn.mozilla.org/fonts/Metropolis/Metropolis-SemiBold.woff2
• https://vpn.mozilla.org/fonts/Metropolis/Metropolis-Bold.woff2

So presumably the crash is happening while sanitizing one of these. But it doesn't reproduce for me.

Asif, can you get the user to try gfx.downloadable_fonts.sanitize_omt = false and see if that changes anything?

Comment 6

[Asif Youssuff]

(In reply to Jonathan Kew (:jfkthame) from comment #5)

Asif, can you get the user to try gfx.downloadable_fonts.sanitize_omt = false and see if that changes anything?

They say they still see the crash.

Comment 7

[Asif Youssuff]

Attachment: about:support from reddit user

Comment 8

[Wes Kocher (:KWierso) (Not reading bugmail; email directly if needed)]

Reddit OP appears to be using the distro-provided version of Firefox from Ubuntu.

Comment 9

[Asif Youssuff]

User installed a new distribution and can no longer reproduce the issue: https://www.reddit.com/r/firefox/comments/hu9uvv/update_firefox_vpn_link_in_email_crashing_firefox/

I posted in here a few days ago regarding the Firefox VPN link crashing the tab in Firefox, it would also sometimes take out other tabs at the same time. I have no clue what the actual issue was but I deleted my post because my whole Kubuntu setup was acting weird. Overwatch would periodically crash during start up, sometimes crash during game, my network link would crash then restart itself. The other tabs would randomly crash on load, regular links just off of reddit, the whole system was acting really unstable.

Every now and then during one of these game crashes I would restart the display manager and then my audio drivers would try to output audio through my screen instead of my sound card. Suffice to say, the whole thing was running very poorly.

I chalked it all up to Ubuntu 20.04 just not working properly and switched to Linux Mint, everything seems to be working properly, including the VPN link.

Comment 10

[Jessie [:jbonisteel] pls NI]

Will close as fixed for then.

Comment 11

[Andrei Vaida [:avaida]]

Hi Jessie, apologies for the delay here. Is QA support still required for this issue?

Comment 12

[Jessie [:jbonisteel] pls NI]

No, doesn't look like it. Thanks.