tests: pass halt_on_error=1 to UBSan
By default, UBSan neither crashes nor exits with a non-zero exit code when undefined behavior has been detected. This is problematic because it makes it much harder to catch issues like https://github.com/systemd/systemd/issues/10346, https://github.com/systemd/systemd/issues/10347, and https://github.com/systemd/systemd/issues/10333. In fact, those issue were found just because I decided to grep the test log, which isn't something that I normally do :-) As it turns out, the only way to make UBSan signal that something is wrong that works more or less reliably everywhere is to pass halt_on_error=1 (though, it's probably worth noting that it's currently not set for PID1 in order not to trigger kernel panics). See https://reviews.llvm.org/D35085#804183 and https://chromium.googlesource.com/chromium/src/testing/libfuzzer/+/HEAD/reference.md
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@ -331,7 +331,7 @@ set -x
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DEFAULT_ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1
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DEFAULT_UBSAN_OPTIONS=print_stacktrace=1:print_summary=1
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DEFAULT_ENVIRONMENT="ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS UBSAN_OPTIONS=\$DEFAULT_UBSAN_OPTIONS"
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DEFAULT_ENVIRONMENT="ASAN_OPTIONS=\$DEFAULT_ASAN_OPTIONS UBSAN_OPTIONS=\$DEFAULT_UBSAN_OPTIONS:halt_on_error=1"
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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