[Bug 2048768] Re: Autopkgtest failures on amd64

This bug is awaiting verification that the linux-azure/6.8.0-1008.8
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-noble-linux-azure' to 'verification-done-noble-
linux-azure'. If the problem still exists, change the tag 'verification-
needed-noble-linux-azure' to 'verification-failed-noble-linux-azure'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-azure-v2 verification-needed-noble-linux-azure

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https://bugs.launchpad.net/bugs/2048768

Title:
Autopkgtest failures on amd64

Status in gcc-10 package in Ubuntu:
Confirmed
Status in gcc-11 package in Ubuntu:
Confirmed
Status in gcc-12 package in Ubuntu:
Fix Released
Status in gcc-13 package in Ubuntu:
Fix Released
Status in gcc-8 package in Ubuntu:
Invalid
Status in gcc-9 package in Ubuntu:
Confirmed
Status in linux package in Ubuntu:
Fix Released
Status in llvm-toolchain-14 package in Ubuntu:
Confirmed
Status in llvm-toolchain-15 package in Ubuntu:
Confirmed
Status in llvm-toolchain-16 package in Ubuntu:
Confirmed
Status in gcc-10 source package in Noble:
Won't Fix
Status in gcc-11 source package in Noble:
Fix Released
Status in gcc-12 source package in Noble:
Fix Released
Status in gcc-13 source package in Noble:
Fix Released
Status in gcc-8 source package in Noble:
Invalid
Status in gcc-9 source package in Noble:
Won't Fix
Status in linux source package in Noble:
Fix Released
Status in llvm-toolchain-14 source package in Noble:
Won't Fix
Status in llvm-toolchain-15 source package in Noble:
Won't Fix
Status in llvm-toolchain-16 source package in Noble:
Confirmed

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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