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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=355069
@ -40,7 +40,7 @@ stack_capture(struct stack *st, struct unwind_state *state)
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{
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stack_zero(st);
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while (unwind_stack_one(state, 1) == 0) {
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while (unwind_stack_one(state, 0) == 0) {
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if (stack_put(st, state->registers[PC]) == -1)
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break;
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}
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