How many failures occur in 10 runs of thunderbird under valgrind?
How many failures occur in 10 runs if you reboot just before each run?
Thunderbird is a user mail agent that uses interactive graphics.
How many failures occur before the display window appears, and how many after?
Are the symptoms and frequency the same for a Radeon card as for NVidia?
On the open-source NVidia driver versus the proprietary driver?
In "dumb framebuffer" mode ("no" acceleration)?
Please tell us which cards: "lspci -nn | grep VGA" or similar.
Are the symptoms and frequency the same for Firefox as for thunderbird?
Are the symptoms and frequency the same for Chrome as for thunderbird?
Please present a histogram of the {mapped file, pc offset, instruction stream}
when the SIGSEGV happens. [You should have at least 70 runs by now: 10 each
for thunderbird plain, with reboot, other graphics card, other NVidia driver,
dumb framebuffer, Firefox, Chrome.]
thunderbird is not available from the Debian stable "jessie" repository
(Debian 8.7.1, 2017-01-20.) Where did you get it?
Which kernel modules have been loaded (lsmod)?
Which version(s) of the low-level X11 and display drivers (DRM: direct
rendering manager) are in use?
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