Seems that sometimes pScreen pointer in miPointerSetPosition() is null.
In the attached crash report, the crash is happening here:
current_x = MIPOINTER(pDev)->x - pScreen->x;
#0 0x000056353930d2af in miPointerSetPosition (pDev=pDev@entry=0x56353a9d0960,
mode=mode@entry=0, screenx=screenx@entry=0x7f4a11cd25c0,
screeny=screeny@entry=0x7f4a11cd25c8, nevents=nevents@entry=0x7f4a11cd25bc,
events=events@entry=0x7f4a20145050) at ../../../../mi/mipointer.c:629
(gdb) x pScreen
0x56353a660470: 0x00000000
But I have seen it also happening a few lines earlier here:
switch_screen = !point_on_screen(pScreen, x, y);
I don't know how it is possible to get the crash on line 629.
The pScreen pointer is accessed before that, and I would expect the crash
already there.
And I have absolutely no idea why I'm seeing that null pointer anyway.
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https://bugs.launchpad.net/bugs/1778233
Title:
Xorg crash when using mouse
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