https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212418
Bug ID: 212418
Summary: kernel panic in _taskqgroup_adjust - uninitialized
variable
Product: Base System
Version: 11.0-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
The variable qid in the fuunction _taskqgroup_adjust in
sys/kern/subr_gtaskqueue.c is used uninitialized in some instances. On my
Purism Librem 15, this variable is always unitialized.
I wrote a little patch to detect when it hasn't been set, but is being used
here:
https://github.com/HardenedBSD/hardenedBSD-playground/commit/7c3b5f7624459e8108873861442be5ce9f497ad7
100% of the time on the Librem 15 at bootup, qid will end up hitting the
KASSERT. I haven't studied the code to figure out a fix, yet. Without the
patch, though, the code in question will cause a write to an arbitrary
location, occasionally causing a kernel panic at bootup. With the patch, the
system is unbootable since qid is always -1.
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