mtest_minidebug test failed about libbacktrace

[ianlancetaylor]

Thanks for finding out how to reproduce the problem. Should be fixed now.

[jtojnar]

We are now experiencing it in Nixpkgs.

The build log looks the same until running tests:

@@ -499,7 +502,7 @@
 xz mtest.mdbg
 objcopy --add-section .gnu_debugdata=mtest.mdbg.xz mtest.strip
 mv mtest.strip mtest_minidebug
-PASS: mtest_minidebug
+FAIL: mtest_minidebug
 PASS: test_elf_32
 PASS: test_elf_64
 PASS: test_macho
@@ -531,52 +534,67 @@
 PASS: mtest
 PASS: xztest
 PASS: xztest_alloc
+=====================================================
+   package-unused version-unused: ./test-suite.log
+=====================================================
+
+# TOTAL: 35
+# PASS:  34
+# SKIP:  0
+# XFAIL: 0
+# FAIL:  1
+# XPASS: 0
+# ERROR: 0
+
+.. contents:: :depth: 2
+
+FAIL: mtest_minidebug
+=====================
+
+test1: [0]: syminfo did not find name
+test1: [1]: syminfo did not find name
+test1: [2]: syminfo did not find name
+test1: [0]: missing function name
+test1: [1]: missing function name
+test1: [2]: missing function name
+test3: [0]: NULL syminfo name
+test3: [1]: NULL syminfo name
+test3: [2]: NULL syminfo name
+test5: NULL syminfo name
+FAIL: backtrace_full noinline
+FAIL: backtrace_simple noinline
+FAIL: backtrace_syminfo variable
+FAIL mtest_minidebug (exit status: 1)
+
 ============================================================================
 Testsuite summary for package-unused version-unused
 ============================================================================
 # TOTAL: 35
-# PASS:  35
+# PASS:  34
 # SKIP:  0
 # XFAIL: 0
-# FAIL:  0
+# FAIL:  1
 # XPASS: 0
 # ERROR: 0
 ============================================================================
+See ./test-suite.log
+============================================================================
+make[2]: *** [Makefile:2028: test-suite.log] Error 1

The test-suite.log just contains the same thing as above:

FAIL: mtest_minidebug
=====================

test1: [0]: syminfo did not find name
test1: [1]: syminfo did not find name
test1: [2]: syminfo did not find name
test1: [0]: missing function name
test1: [1]: missing function name
test1: [2]: missing function name
test3: [0]: NULL syminfo name
test3: [1]: NULL syminfo name
test3: [2]: NULL syminfo name
test5: NULL syminfo name
FAIL: backtrace_full noinline
FAIL: backtrace_simple noinline
FAIL: backtrace_syminfo variable
FAIL mtest_minidebug (exit status: 1)

[ianlancetaylor]

The test does pass for me on x86_64 on Ubuntu Rodete. Tell me more about the environment in which it fails.

[mweinelt]

I could bisect this error to our (nixpkgs) xz upgrade from 5.4.6 to 5.6.0.

[trofi]

tukaani-project/xz@6daa4d0 xz: Use threaded mode by defaut (as if --threads=0 was used). upstream change caused the test failures in libbacktrace.

[trofi]

Using XZ_OPT="--trheads=2" environment variable I was able to reproduce the test failures on xz-5.4.6 as well.