[Bug 93415] New: Xorg crashes under Zaphod mode when adding/removing display (bisected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93415

            Bug ID: 93415
           Summary: Xorg crashes under Zaphod mode when adding/removing
                    display (bisected)
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: chewi at gentoo.org
        QA Contact: xorg-team at lists.x.org

Created attachment 120553
  --> https://bugs.freedesktop.org/attachment.cgi?id=120553&action=edit
Xorg.0.log

When I turn my HDMI-connected AV unit on or off, Xorg (1.17.4) suddenly
crashes.

This has been observed on xf86-video-ati 7.6.1 and 78fbca0. It worked fine
under 7.5.0 and I have bisected the problem to 2f11dcd, which added hotplugging
for DP 1.2. I don't have any DisplayPort hardware here though, it's all
DVI/HDMI.

This is only affecting Zaphod mode. I have tried with no xorg.conf to give me
xrandr mode and I was unable to reproduce the problem there.

I have attached Xorg.0.log, which includes a backtrace. I have looked up the
addresses in radeon_drv.so and they correspond to the area that was changed.
I'm not sure exactly where the first entry is as I don't have a core dump but I
may obtain one later.

[172723.305] (EE) 3: /usr/lib64/xorg/modules/drivers/radeon_drv.so
(0x7fdbbdd19000+0x4d510) [0x7fdbbdd66510]
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/tree/src/drmmode_display.c?id=78fbca095ae9887a2d3de48bb07975e2d1126e68#n1567

[172723.305] (EE) 4: /usr/lib64/xorg/modules/drivers/radeon_drv.so
(0x7fdbbdd19000+0x502c9) [0x7fdbbdd692c9]
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/tree/src/drmmode_display.c?id=78fbca095ae9887a2d3de48bb07975e2d1126e68#n2403

[172723.305] (EE) 5: /usr/lib64/xorg/modules/drivers/radeon_drv.so
(0x7fdbbdd19000+0x50387) [0x7fdbbdd69387]
http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/tree/src/drmmode_display.c?id=78fbca095ae9887a2d3de48bb07975e2d1126e68#n2426

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