stall-detector: Try hard not to crash while collecting backtrace #488

Job	Run time
Test with DPDK enabled / test	12m 23s
Test (clang++, C++20, dev) / test	8m 44s
Test (clang++, C++20, debug) / test	11m 47s
Test with C++20 modules enabled / test	5m 48s
Test (clang++, C++20, release) / test	9m 31s
Test (clang++, C++23, debug) / test	11m 33s
Test (clang++, C++23, dev) / test	8m 32s
Test (clang++, C++23, release) / test	12m 29s
Test (g++, C++20, debug) / test	12m 18s
Test (g++, C++20, dev) / test	7m 49s
Test (g++, C++20, release) / test	12m 24s
Test (g++, C++23, debug) / test	12m 23s
Test (g++, C++23, dev) / test	8m 37s
Test (g++, C++23, release) / test	12m 21s
	2h 26m 39s

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