[Webkit-unassigned] [Bug 146725] New: Webkit2Gtk freezes when login into fastmail.com

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146725

            Bug ID: 146725
           Summary: Webkit2Gtk freezes when login into fastmail.com
    Classification: Unclassified
           Product: WebKit
           Version: 420+
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: joel at dimbernat.net

Hello,

Using Archlinux, Epiphany/Web 3.16 - webkit2gtk 2.8.3 - gtk 3.16
When I log into my https://fastmail.com account, the browser freezes and make the computer unusable. The processes seem to eat all the CPU.

To help debugging, I compiled the code found there: https://wiki.gnome.org/Projects/WebKitGtk/ProgrammingGuide/Tutorial replacing webkit.org with fastmail.com.
gcc -o browser main.c `pkg-config webkit2gtk-4.0 --cflags --libs`

It has the same behavior as epiphany, but gave me this output:
radeon: The kernel rejected CS, see dmesg for more information.

which I did, and dmesg shows:
[347915.271229] WebKitPluginPro[10246]: segfault at 0 ip 00007fcc44f31afb sp 00007fff84abe110 error 4 in libwebkit2gtk-4.0.so.37.6.6[7fcc44918000+214d000]
[362680.543470] WebKitPluginPro[17471]: segfault at d0 ip 00007f3e6fbfcc42 sp 00007ffe7cc3c098 error 4 in libgdk-3.so.0.1600.5[7f3e6fbc3000+c1000]
[365053.019788] [drm:radeon_cs_ioctl [radeon]] *ERROR* Failed to parse relocation -22!

I don't think it's radeon related though, because it also freezes on my laptop with intel GPU.

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