Another setting that makes Xorg segfault is AutoEnableDevices "false". All
these settings
have one common behavior: it xf86ConfigLayout.inputs to contain a list of
devices.
In xf86Init.c:809 InitInput(), the loop is executed if the above condition
(Auto*Devices
false) holds. An excerpt:
808 /* Initialize all configured input devices */
809 for (pInfo = xf86ConfigLayout.inputs; pInfo && *pInfo; pInfo++) {
810 (*pInfo)->options = xf86AddNewOption((*pInfo)->options, "driver",
(*pInfo)->driver);
811 (*pInfo)->options = xf86AddNewOption((*pInfo)->options,
"identifier", (*pInfo)->name);
812 /* If one fails, the others will too */
813 if (NewInputDeviceRequest((*pInfo)->options, NULL, &dev) ==
BadAlloc)
814 break;
815 }
Line 813 is the one to pay attention to. It passes
xf86ConfigLayout.inputs->options to
NewInputDeviceRequest. This seems to be a XF86OptionPtr:
(gdb) print *(XF86OptionPtr)xf86ConfigLayout.inputs->options
$1 = {list = {next = 0x555555a17910}, opt_name = 0x555555a179a0 "CorePointer",
opt_val = 0x555555a17980 "on", opt_used = 0, opt_comment = 0x0}
NewInputDeviceRequest expects an InputOption * which will look like:
(gdb) print *(InputOption*)xf86ConfigLayout.inputs->options
$2 = {key = 0x555555a17910 "@z\241UUU", value = 0x555555a179a0 "CorePointer",
next = 0x555555a17980}
That's exactly the garbage that I got in the report. What's more important,
what change
caused this? Xorg -configure segfaults as well, though I'm not sure if it's
related to
this issue.
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https://bugs.launchpad.net/bugs/931397
Title:
Xorg crashes with AutoAddDevices "false"
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