Author: ian
Date: Sun Nov 24 21:08:56 2019
New Revision: 355069
URL: https://svnweb.freebsd.org/changeset/base/355069
Log:
When doing ARM stack unwinding as part of stack_save(9), do not search
loaded modules (pass 0/false for the can_lock arg). Searching the unwind
info in modules acquires an exclusive sxlock, and the stack(9) functions can
be called in a context where unbounded sleeps are forbidden (such as from
the witness checkorder code).
Just ignoring the existence of modules in stack_save() is not ideal, so I'm
looking for a better solution, but this commit will make it possible to boot
an ARM kernel with WITNESS enabled again, until I get something better.
PR: 242200
Modified:
head/sys/arm/arm/stack_machdep.c
Modified: head/sys/arm/arm/stack_machdep.c
==============================================================================
--- head/sys/arm/arm/stack_machdep.c Sun Nov 24 20:51:09 2019
(r355068)
+++ head/sys/arm/arm/stack_machdep.c Sun Nov 24 21:08:56 2019
(r355069)
@@ -40,7 +40,7 @@ stack_capture(struct stack *st, struct unwind_state *s
{
stack_zero(st);
- while (unwind_stack_one(state, 1) == 0) {
+ while (unwind_stack_one(state, 0) == 0) {
if (stack_put(st, state->registers[PC]) == -1)
break;
}
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