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Google coredumper library
License: BSD 3-Clause "New" or "Revised" License
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coredumper_unittest fails on Ubuntu 20.04
If I compile and run the tests on Red Hat EL 7.x, they all pass fine.
If I compile and run the tests on Ubuntu 20.04 LTS, the coredumper_unittest fails in the GDB test because the generated core cannot be read and so it times out waiting for the expected results:
GNU gdb (GDB) 10.1
...
Reading symbols from /proc/193258/exe...
warning: core file may not match specified executable file.
Core was generated by `.libs/coredumper_unittest'.
#0 0x00007f5468a3f9ac in ?? ()
[Current thread is 1 (LWP 193258)]
(gdb) Id Target Id Frame
* 1 LWP 193258 0x00007f5468a3f9ac in ?? ()
2 LWP 193274 0x000055e969ac4a67 in ?? ()
3 LWP 193273 0x000055e969ac4a69 in ?? ()
and if I try to use GDB on the core I get:
$ gdb -c core-test .libs/coredumper_unittest
Reading symbols from .libs/coredumper_unittest...
warning: core file may not match specified executable file.
Core was generated by `.libs/coredumper_unittest'.
#0 0x00007f5468a3f9ac in ?? ()
[Current thread is 1 (LWP 193258)]
(gdb) thr a a bt
Thread 3 (LWP 193273):
#0 0x000055e969ac4a69 in ?? ()
#1 0x00007f5468a01609 in ?? ()
#2 0x0000000000000000 in ?? ()
Thread 2 (LWP 193274):
#0 0x000055e969ac4a67 in ?? ()
#1 0x00007f5468a01609 in ?? ()
#2 0x0000000000000000 in ?? ()
Thread 1 (LWP 193258):
#0 0x00007f5468a3f9ac in ?? ()
Backtrace stopped: Cannot access memory at address 0x5aa4da70
But if I compile on a Red Hat 7.x system it works (note, it works even on an Ubuntu system: it doesn't matter where we RUN the test only where we compile it).
There must be some change in the system headers etc. from RHEL 7 to Ubuntu 20.04 that causes the coredumper code to be miscompiled so that it cannot write a valid core file any longer. For posterity here is the output from the core generated by coredumper_unittest compiled on RHEL 7:
warning: core file may not match specified executable file.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `./coredumper_unittest'.
#0 0x00000000004044fa in WriteCoreDump ()
[Current thread is 1 (Thread 0x7f5ae8ca2740 (LWP 4077741))]
(gdb) Id Target Id Frame
* 1 Thread 0x7f5ae8ca2740 (LWP 4077741) 0x00000000004044fa in WriteCoreDump ()
2 Thread 0x7f5ae84a0700 (LWP 4077745) 0x0000000000401b16 in Busy ()
3 Thread 0x7f5ae8ca1700 (LWP 4077744) 0x0000000000401b21 in Busy ()
(gdb)
Unit tests fail on Ubuntu 17.10
The unittests fail when run on Ubuntu 17.10 / GCC 7.2 / binutils 2.29.1:
./preconfig
./configure CFLAGS=-O1
make
./coredumper_unittest
...
coredumper_unittest: ../src/coredumper_unittest.c:396: CheckExtraNotesWithReadElf: Assertion `note_index == kExtraNotesCount' failed.
Fails compiled with -O2 / GCC 7.x
When compiling with GCC 7.2 / 7.3 and -O2, the coredumper library doesn't work properly. The unittest dumps core immediately. When using the library in a real program I've seen things such as the coredumper library hanging inside the syscalls.
If you compile with -O1, then everything works. It also works with -O2 and older compilers (GCC 4.x and 5.x for sure... I'm not sure about 6.x). I don't know if this represents a bug in the coredumper code or an issue with the optimizer in GCC (most likely the former).
To reproduce simply check out and build using the normal operations and GCC 7.x:
./preconfig
./configure
make
make check
will dump core. If you clean up then build with -O1, it will work:
git clean -fdX
./preconfig
./configure CFLAGS=-O1
make
make check
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