|  | @@ -199,7 +199,15 @@ void grpc_closure_list_sched(grpc_exec_ctx *exec_ctx, grpc_closure_list *list) {
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				|  |  |    while (c != NULL) {
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				|  |  |      grpc_closure *next = c->next_data.next;
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				|  |  |  #ifndef NDEBUG
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				|  |  | -    GPR_ASSERT(!c->scheduled);
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				|  |  | +    if (c->scheduled) {
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				|  |  | +      gpr_log(GPR_ERROR,
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				|  |  | +              "Closure already scheduled. (closure: %p, created: [%s:%d], "
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				|  |  | +              "previously scheduled at: [%s: %d] run?: %s",
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				|  |  | +              closure, closure->file_created, closure->line_created,
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				|  |  | +              closure->file_initiated, closure->line_initiated,
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				|  |  | +              closure->run ? "true" : "false");
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				|  |  | +      abort();
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				|  |  | +    }
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				|  |  |      c->scheduled = true;
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				|  |  |      c->file_initiated = file;
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				|  |  |      c->line_initiated = line;
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