The same problem was reported on Arch and they could confirm it started due to changes in the kernel related to ASLR.
https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/20 Relevant changed from kernel 6.5 to 6.6 on Ubuntu: -CONFIG_ARCH_MMAP_RND_BITS=28 +CONFIG_ARCH_MMAP_RND_BITS=32 CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS=y -CONFIG_ARCH_MMAP_RND_COMPAT_BITS=8 +CONFIG_ARCH_MMAP_RND_COMPAT_BITS=16 Setting vm.mmap_rnd_bits to 28 bits seems to be enough to workaround the problem. ** Bug watch added: gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues #20 https://gitlab.archlinux.org/archlinux/packaging/packages/linux/-/issues/20 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2048768 Title: Autopkgtest failures on amd64 Status in linux package in Ubuntu: New Status in llvm-toolchain-14 package in Ubuntu: New Status in linux source package in Noble: New Status in llvm-toolchain-14 source package in Noble: New Bug description: Some tests related to the address sanitizer are occasionally failing on amd64 (also for llvm-toolchain-15 and 16): -------------- FAIL: LLVM regression suite :: test_leaksan.c (38 of 45) 746s ******************** TEST 'LLVM regression suite :: test_leaksan.c' FAILED ******************** 746s Script: 746s -- 746s : 'RUN: at line 4'; /usr/bin/clang-14 -o /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp -fsanitize=address -g /tmp/autopkgtest.gHVujV/autopkgtest_tmp/tests/test_leaksan.c 746s : 'RUN: at line 5'; env ASAN_OPTIONS="log_path=stdout:exitcode=0" /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp 2>&1 > /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp.out 746s : 'RUN: at line 6'; grep -q "detected memory leaks" /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp.out 746s -- 746s Exit Code: 139 746s 746s Command Output (stderr): 746s -- 746s /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.script: line 3: 3335 Segmentation fault (core dumped) env ASAN_OPTIONS="log_path=stdout:exitcode=0" /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp 2>&1 > /tmp/autopkgtest.gHVujV/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp.out -------------- If you run the test manually you'll notice that it works but eventually crashes: -------------------- ubuntu@autopkgtest:/tmp/autopkgtest.oXC2FP/autopkgtest_tmp/build/tests/Output$ ./test_leaksan.c.tmp ================================================================= ==8631==ERROR: LeakSanitizer: detected memory leaks Direct leak of 7 byte(s) in 1 object(s) allocated from: #0 0x5e9c3441ed12 in __interceptor_malloc (/tmp/autopkgtest.oXC2FP/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp+0xa3d12) (BuildId: 6f71ac388125722ade1ea86ee3661c0d884dd193) #1 0x5e9c3445acb8 in main /tmp/autopkgtest.oXC2FP/autopkgtest_tmp/tests/test_leaksan.c:13:7 #2 0x7e84e1e280cf (/lib/x86_64-linux-gnu/libc.so.6+0x280cf) (BuildId: f0b834daa3d05a80967e9ec2f990a1ea71c958fa) SUMMARY: AddressSanitizer: 7 byte(s) leaked in 1 allocation(s). ubuntu@autopkgtest:/tmp/autopkgtest.oXC2FP/autopkgtest_tmp/build/tests/Output$ ./test_leaksan.c.tmp ================================================================= ==8634==ERROR: LeakSanitizer: detected memory leaks Direct leak of 7 byte(s) in 1 object(s) allocated from: #0 0x5f19be5f6d12 in __interceptor_malloc (/tmp/autopkgtest.oXC2FP/autopkgtest_tmp/build/tests/Output/test_leaksan.c.tmp+0xa3d12) (BuildId: 6f71ac388125722ade1ea86ee3661c0d884dd193) #1 0x5f19be632cb8 in main /tmp/autopkgtest.oXC2FP/autopkgtest_tmp/tests/test_leaksan.c:13:7 #2 0x77c7d3c280cf (/lib/x86_64-linux-gnu/libc.so.6+0x280cf) (BuildId: f0b834daa3d05a80967e9ec2f990a1ea71c958fa) SUMMARY: AddressSanitizer: 7 byte(s) leaked in 1 allocation(s). ubuntu@autopkgtest:/tmp/autopkgtest.oXC2FP/autopkgtest_tmp/build/tests/Output$ ./test_leaksan.c.tmp Segmentation fault (core dumped) -------------------- After some investigation I found that it will not fail with ASLR disabled: sudo sysctl kernel.randomize_va_space=0 while : ; do env ASAN_OPTIONS="log_path=stdout:exitcode=0" ./test_leaksan.c.tmp >/dev/null; if [ $? -ne 0 ] ; then echo crashed ; fi done If you enable ASLR it will start to crash: $ sudo sysctl kernel.randomize_va_space=2 $ while : ; do env ASAN_OPTIONS="log_path=stdout:exitcode=0" ./test_leaksan.c.tmp >/dev/null; if [ $? -ne 0 ] ; then echo crashed ; fi done Segmentation fault (core dumped) crashed Segmentation fault (core dumped) crashed Segmentation fault (core dumped) crashed Segmentation fault (core dumped) crashed Segmentation fault (core dumped) crashed If you enable ASLR again and run it with "setarch -R" (to disable ASLR for this binary), it will also not crash. 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