Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: llvm-toolchain-14 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2048768
Title:
Autopkgtest failures on amd64
Status in linux package in Ubuntu:
Confirmed
Status in llvm-toolchain-14 package in Ubuntu:
Confirmed
Status in linux source package in Noble:
Confirmed
Status in llvm-toolchain-14 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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