win: fix lock function call for backtrace collection (#41849)

vtjnash · KristofferC · commit d199e03e049f · 2021-08-11T17:37:11.000+02:00
Avoids an assert when this is triggered (cherry picked from commit 2d81742)
diff --git a/src/signals-win.c b/src/signals-win.c
@@ -137,7 +137,7 @@ void jl_throw_in_ctx(jl_value_t *excpt, PCONTEXT ctxThread)
             ptls->bt_size = rec_backtrace_ctx(ptls->bt_data, JL_MAX_BT_SIZE, ctxThread, ptls->pgcstack);
         }
         else if (have_backtrace_fiber) {
-            JL_LOCK(&backtrace_lock);
+            JL_LOCK_NOGC(&backtrace_lock);
             stkerror_ctx = ctxThread;
             stkerror_ptls = ptls;
             jl_swapcontext(&error_return_fiber, &collect_backtrace_fiber);

Original file line number	Diff line number	Diff line change
`@@ -137,7 +137,7 @@ void jl_throw_in_ctx(jl_value_t *excpt, PCONTEXT ctxThread)`
`137`	`137`	`ptls->bt_size = rec_backtrace_ctx(ptls->bt_data, JL_MAX_BT_SIZE, ctxThread, ptls->pgcstack);`
`138`	`138`	`}`
`139`	`139`	`else if (have_backtrace_fiber) {`
`140`		`- JL_LOCK(&backtrace_lock);`
	`140`	`+ JL_LOCK_NOGC(&backtrace_lock);`
`141`	`141`	`stkerror_ctx = ctxThread;`
`142`	`142`	`stkerror_ptls = ptls;`
`143`	`143`	`jl_swapcontext(&error_return_fiber, &collect_backtrace_fiber);`