[Bug 1867173] Re: FTBFS with llvm-10

[Ulrich Weigand]

Huh, sorry.  Must have been a mis-click, I just wanted to subscribe to
the bug I think.  I've removed the flag now.

** Information type changed from Public Security to Public

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Hi Seth,
I see no security aspect either.

Ulrich marked it as such, maybe he can speak up.
Otherwise I think this is fine to be considered a non-security issue.

** Changed in: postgresql-12 (Ubuntu)
   Status: Incomplete => Invalid

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[Bug 1867173] Re: FTBFS with llvm-10

[Seth Arnold]

Hello, I don't quickly spot why this bug is marked security; is there a
security component here that I am overlooking?

Thanks

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[Bug 1867173] Re: FTBFS with llvm-10

[Frank Heimes]

** Also affects: ubuntu-z-systems
   Importance: Undecided
   Status: New

** Changed in: ubuntu-z-systems
   Status: New => Fix Released

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[Bug 1867173] Re: FTBFS with llvm-10

[Launchpad Bug Tracker]

This bug was fixed in the package llvm-toolchain-10 - 1:10.0.0-1ubuntu2

---
llvm-toolchain-10 (1:10.0.0-1ubuntu2) focal; urgency=medium

  * Apply D76596.diff, proposed backport from the trunk. LP: #1867173.

 -- Matthias Klose   Thu, 02 Apr 2020 11:56:42 +0200

** Changed in: llvm-toolchain-10 (Ubuntu)
   Status: Fix Committed => Fix Released

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Old version:
ubuntu@s1lp05:~$ dpkg -S /usr/lib/llvm-10/bin/llvm-lto
llvm-10: /usr/lib/llvm-10/bin/llvm-lto
ubuntu@s1lp05:~$ dpkg -l llvm-10
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name   VersionArchitecture Description
+++-==-==--===
ii  llvm-101:10.0.0~+rc5-1ubuntu1 s390xModular compiler and 
toolchain technologies

Fails:
ubuntu@s1lp05:~$ /usr/lib/llvm-10/bin/llvm-lto -thinlto 
-thinlto-action=thinlink -o 
/home/ubuntu/postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode/postgres.index.bc
 
/home/ubuntu/postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode/postgres/access/brin/brin.bc
Stack dump:
0.  Program arguments: /usr/lib/llvm-10/bin/llvm-lto -thinlto 
-thinlto-action=thinlink -o 
/home/ubuntu/postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode/postgres.index.bc
 
/home/ubuntu/postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode/postgres/access/brin/brin.bc
 
#0 0x03ffa032b1ca PrintStackTrace 
/build/llvm-toolchain-10-m0H4U3/llvm-toolchain-10-10.0.0~+rc5/llvm/lib/Support/Unix/Signals.inc:568:7
#1 0x03ffa032b1ca PrintStackTraceSignalHandler 
/build/llvm-toolchain-10-m0H4U3/llvm-toolchain-10-10.0.0~+rc5/llvm/lib/Support/Unix/Signals.inc:624:3
Segmentation fault


Upgrade:
ubuntu@s1lp05:~$ sudo apt dist-upgrade
Reading package lists... Done
Building dependency tree   
Reading state information... Done
Calculating upgrade... Done
The following packages were automatically installed and are no longer required:
  libapt-pkg5.90 libberkeleydb-perl libbind9-161 libboost-iostreams1.67.0 
libboost-system1.67.0 libboost-thread1.67.0 libbrlapi0.6 libcbor0 
libcgi-fast-perl libcgi-pm-perl
  libclass-accessor-perl libdns-export1104 libdns-export1107 libdns1104 
libdns1107 libdns1109 libfcgi-perl libfreezethaw-perl libicu63 libirs161 
libisc-export1100 libisc-export1104
  libisc1100 libisc1104 libisc1105 libisccc161 libisccfg163 liblwres161 
libmldbm-perl libprocps7 libpython2-stdlib libpython2.7-minimal 
libpython2.7-stdlib libpython3.7
  libpython3.7-minimal libpython3.7-stdlib libruby2.5 libsbc1 libspandsp2 
libwireshark12 libwiretap9 libwscodecs2 libwsutil10 linux-5.4-headers-5.4.0-14 
linux-headers-4.15.0-62
  linux-headers-4.15.0-62-generic linux-headers-4.15.0-74 
linux-headers-4.15.0-74-generic linux-headers-5.4.0-14-generic 
linux-headers-5.4.0-9 linux-headers-5.4.0-9-generic
  linux-image-4.15.0-62-generic linux-image-4.15.0-74-generic 
linux-image-5.4.0-14-generic linux-image-5.4.0-9-generic 
linux-modules-4.15.0-62-generic linux-modules-4.15.0-74-generic
  linux-modules-5.4.0-14-generic linux-modules-5.4.0-9-generic 
linux-modules-extra-4.15.0-62-generic linux-modules-extra-4.15.0-74-generic 
linux-modules-extra-5.4.0-14-generic
  linux-modules-extra-5.4.0-9-generic php7.3-dev python2 python2-minimal 
python2.7 python2.7-minimal python3-asn1crypto python3-nacl python3-pymacaroons 
python3.7 python3.7-minimal ruby2.5
  ruby2.5-dev ruby2.5-doc
Use 'sudo apt autoremove' to remove them.
The following packages will be REMOVED:
  libllvm10-dbgsym llvm-10-dbgsym llvm-10-dev-dbgsym llvm-10-runtime-dbgsym 
llvm-10-tools-dbgsym
The following packages will be upgraded:
  clang-10 libclang-common-10-dev libclang-cpp10 libclang1-10 libllvm10 llvm-10 
llvm-10-dev llvm-10-runtime llvm-10-tools
9 upgraded, 0 newly installed, 5 to remove and 0 not upgraded.
Need to get 70.0 MB of archives.
After this operation, 100 MB disk space will be freed.
Do you want to continue? [Y/n] Y
Get:1 http://ports.ubuntu.com focal-proposed/universe s390x llvm-10-dev s390x 
1:10.0.0-1ubuntu2 [26.7 MB]
Get:2 http://ports.ubuntu.com focal-proposed/universe s390x llvm-10-tools s390x 
1:10.0.0-1ubuntu2 [311 kB]  
 
Get:3 http://ports.ubuntu.com focal-proposed/universe s390x clang-10 s390x 
1:10.0.0-1ubuntu2 [67.7 kB] 
  
Get:4 http://ports.ubuntu.com focal-proposed/universe s390x 
libclang-common-10-dev s390x 1:10.0.0-1ubuntu2 [1158 kB]
 
Get:5 http://ports.ubuntu.com focal-proposed/universe s390x libclang-cpp10 
s390x 1:10.0.0-1ubuntu2 [11.3 MB]   
  
Get:6 http://ports.ubuntu.com focal-proposed/main s390x libllvm10 s390x 
1:10.0.0-1ubuntu2 [16.7 MB] 
 
Get:7 http://ports.ubuntu.com focal-proposed/universe s390x llvm-10 s390x 
1:10.0.0-1ubuntu2 [5268 kB]

[Bug 1867173] Re: FTBFS with llvm-10

[Matthias Klose]

** Changed in: llvm-toolchain-10 (Ubuntu)
   Status: New => Fix Committed

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[Bug 1867173] Re: FTBFS with llvm-10

[Jonas Paulsson]

I tried it, and it seems to fix this test case at least.

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[Bug 1867173] Re: FTBFS with llvm-10

[Ulrich Weigand]

It seems this was a known common-code issue that is fixed in mainline
not in LLVM 10.  There's already a bug to port it to 10.0.1 (PR45272)
with a back ported patch https://reviews.llvm.org/D76596.

Can you try whether this fixes the problem?

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[Bug 1867173] Re: FTBFS with llvm-10

[Jonas Paulsson]

I think I found a bug that I would guess is causing this crash:

https://bugs.llvm.org/show_bug.cgi?id=45384


** Bug watch added: bugs.llvm.org/ #45384
   https://bugs.llvm.org/show_bug.cgi?id=45384

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[Bug 1867173] Re: FTBFS with llvm-10

[Jonas Paulsson]

I tracked this down to a single commit that if reverted stops the test
case from segfaulting: 2d5820c. This is a patch that improves
CorrelatedValuePropagation to also handle And instructions.

I am currently working on finding the exact bug - I am not yet sure if
the bug is actually in that pass or if this change merely exposes
something else.

One thing I tried was to insert a clearing of the LazyValueInfo cache
before each call to it. This changed the results somewhat, but llvm-lto
still crashes.

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

llvm in Focal is currently at:
10.0.0~+rc5-1ubuntu1

Which should roughly be the RC5 tag plus
d21664cce1db8debe2528f36b1fbd2b8af9c9401

On [1] you can find produced binaries, also the sources if you extract
the tarballs and the build logs.

I think the cmake call is the following, but please have a look at the
build log yourself if in doubt.

cd build-llvm && \
 $CMAKE_BIN ../llvm/ \
-DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;libcxx;libcxxabi;compiler-rt;lld;debuginfo-tests;polly;openmp;lldb"
 \
-DCMAKE_INSTALL_PREFIX=/usr/lib/llvm-10 \
-DCMAKE_VERBOSE_MAKEFILE=ON \
-DCMAKE_BUILD_TYPE=RelWithDebInfo \
-DCMAKE_CXX_FLAGS_RELWITHDEBINFO="-O2 -DNDEBUG -g1" \
-DLLVM_LINK_LLVM_DYLIB=ON \
-DLLVM_INSTALL_UTILS=ON \
-DLLVM_VERSION_SUFFIX= \
-DLLVM_ENABLE_SPHINX=ON \
-DSPHINX_WARNINGS_AS_ERRORS=OFF \
-DLLVM_BUILD_LLVM_DYLIB=ON \
-DLLVM_ENABLE_RTTI=ON \
-DLLVM_ENABLE_FFI=ON \
-DPYTHON_EXECUTABLE=/usr/bin/python3 -DLLVM_BINUTILS_INCDIR=/usr/include/ 
-DLLVM_USE_PERF=yes -DLLVM_ENABLE_LIBPFM=ON \
-DLIBCLANG_LIBRARY_VERSION=1 \
-DCLANG_LINK_CLANG_DYLIB=ON \
-DENABLE_LINKER_BUILD_ID=ON \
-DPOLLY_BUNDLED_JSONCPP=OFF \
-DCOMPILER_RT_USE_LIBCXX=NO \
-DLLVM_ENABLE_Z3_SOLVER=OFF \
-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD="AVR" \
-DLLVM_TEMPORARILY_ALLOW_OLD_TOOLCHAIN=ON \
-DCLANG_VENDOR=Ubuntu \
-DCLANG_ENABLE_BOOTSTRAP=ON \
-DCLANG_BUILD_EXAMPLES=OFF \
-DBOOTSTRAP_CMAKE_CXX_FLAGS=' -fuse-ld=gold -fPIC 
-Wno-unused-command-line-argument -Wno-unknown-warning-option ' \
-DBOOTSTRAP_CMAKE_C_FLAGS=' -fuse-ld=gold -fPIC 
-Wno-unused-command-line-argument -Wno-unknown-warning-option ' \
-DCLANG_BOOTSTRAP_PASSTHROUGH="CMAKE_INSTALL_PREFIX;CMAKE_VERBOSE_MAKEFILE;CMAKE_BUILD_TYPE;CMAKE_CXX_FLAGS_RELWITHDEBINFO;LLVM_LINK_LLVM_DYLIB;LLVM_INSTALL_UTILS;LLVM_VERSION_SUFFIX;LLVM_ENABLE_SPHINX;SPHINX_WARNINGS_AS_ERRORS;LLVM_BUILD_LLVM_DYLIB;LLVM_ENABLE_RTTI;LLVM_ENABLE_FFI;LIBCLANG_LIBRARY_VERSION;ENABLE_LINKER_BUILD_ID;POLLY_BUNDLED_JSONCPP;LLVM_EXPERIMENTAL_TARGETS_TO_BUILD;LLVM_USE_PERF;LLVM_ENABLE_ASSERTIONS;LLVM_BINUTILS_INCDIR;LLVM_HOST_TRIPLE;LLVM_COMPILER_CHECKED;COMPILER_RT_BUILD_BUILTINS;LIBOMP_LIBFLAGS;CMAKE_SHARED_LINKER_FLAGS;PYTHON_EXECUTABLE;LLVM_ENABLE_Z3_SOLVER"

[1]: https://launchpad.net/ubuntu/+source/llvm-
toolchain-10/1:10.0.0~+rc5-1ubuntu1/+build/18857669

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[Bug 1867173] Re: FTBFS with llvm-10

[Jonas Paulsson]

I tried it on trunk (9adc7fc) built with gcc, and then also built a
second time with itself, but it did not show up.

It would help me if I could get the right cmake line, and the git commit
ID. I used:

cmake -G Ninja -DLLVM_ENABLE_PROJECTS="clang;compiler-rt"
-DCMAKE_BUILD_TYPE="Release" -DLLVM_ENABLE_ASSERTIONS=On

Not sure what to try next - maybe disabling assertions and only building
the SystemZ target?

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Note: running the same against llvm-9 fails (probably because the former
build steps were done with llvm-10)

/usr/lib/llvm-9/bin/llvm-lto -thinlto -thinlto-action=thinlink -o 
postgres.index.bc postgres/access/brin/brin.bc
error: can't create module summary index for buffer: Invalid summary version 8. 
Version should be in the range [1-7].
LLVM ERROR: ThinLink didn't create an index

But we know that with llvm-9 the full build works. Never the less that
will make e.g. bisecting harder as we can't just repeat this last step.

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

** Attachment added: "build dir with all artifacts"
   
https://bugs.launchpad.net/ubuntu/+source/postgresql-12/+bug/1867173/+attachment/5341460/+files/postgresql-12-12.2.tar.xz

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

This is the full build directory.

to reach the error in there do:
$ postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode
$ /usr/lib/llvm-10/bin/llvm-lto -thinlto -thinlto-action=thinlink -o 
postgres.index.bc postgres/access/brin/brin.bc

I extracted the same on x86 and tried it there, it works on x86.
So you really will need an s390x system to trigger the crash.

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[Bug 1867173] Re: FTBFS with llvm-10

[Jonas Paulsson]

I would be happy to help on this but not sure where to start - to run

/usr/lib/llvm-10/bin/llvm-lto -thinlto -thinlto-action=thinlink -o
postgres.index.bc postgres/access/brin/brin.bc

, I would need the input brin.bc file, but I don't have it...

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[Bug 1867173] Re: FTBFS with llvm-10

[Ulrich Weigand]

** Information type changed from Public to Public Security

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[Bug 1867173] Re: FTBFS with llvm-10

[Frank Heimes]

** Tags added: s390x

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Attaching a core dump out of gdb matching this issue.

** Attachment added: "core.41655.xz"
   
https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-10/+bug/1867173/+attachment/5336188/+files/core.41655.xz

** Changed in: postgresql-12 (Ubuntu)
   Status: New => Incomplete

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

It doesn't need all the arguments and can be shortened to:
/usr/lib/llvm-10/bin/llvm-lto -thinlto -thinlto-action=thinlink -o 
postgres.index.bc postgres/access/brin/brin.bc
Stack dump:
0.  Program arguments: /usr/lib/llvm-10/bin/llvm-lto -thinlto 
-thinlto-action=thinlink -o postgres.index.bc postgres/access/brin/brin.bc 
#0 0x03ff9e32b14a (/usr/lib/s390x-linux-gnu/libLLVM-10.so.1+0x9ab14a)
Segmentation fault

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Log file out of the build process that fails.
At the end is the command to /usr/lib/llvm-10/bin/llvm-lto that crashes

#0 0x03ff7faab14a (/usr/lib/s390x-linux-gnu/libLLVM-10.so.1+0x9ab14a)
Segmentation fault

** Attachment added: "s390-llvm10-pg12-crash.txt"
   
https://bugs.launchpad.net/ubuntu/+source/llvm-toolchain-10/+bug/1867173/+attachment/5336176/+files/s390-llvm10-pg12-crash.txt

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[Bug 1867173] Re: FTBFS with llvm-10

[Christian Ehrhardt ]

Here a backtrace in GDB, let me know if I can check anything for you
there:

ubuntu@s1lp05:~/postgresql-12-12.2/build/tmp_install/usr/lib/postgresql/12/lib/bitcode$
 gdb /usr/lib/llvm-10/bin/llvm-ltoGNU gdb (Ubuntu 9.1-0ubuntu1) 9.1
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Reading symbols from /usr/lib/llvm-10/bin/llvm-lto...
Reading symbols from 
/usr/lib/debug/.build-id/2c/dfd421eef6cbe0600d24e01b38e71763bb4333.debug...
(gdb) run -thinlto -thinlto-action=thinlink -o postgres.index.bc 
postgres/access/brin/brin.bc
Starting program: /usr/lib/llvm-10/bin/llvm-lto -thinlto 
-thinlto-action=thinlink -o postgres.index.bc postgres/access/brin/brin.bc
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/s390x-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
handleErrors<(lambda at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:988:33)>(void)
 ()
at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:907
907 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:
 No such file or directory.
(gdb) bt
#0  handleErrors<(lambda at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:988:33)>(void)
 ()
at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:907
#1  0x03fff9d512e0 in handleAllErrors<(lambda at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:988:33)>
 ()
at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:925
#2  toString () at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/include/llvm/Support/Error.h:988
#3  0x03fffab16536 in addModule () at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/lib/LTO/ThinLTOCodeGenerator.cpp:515
#4  0x8001c5ce in thinLink () at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/tools/llvm-lto/llvm-lto.cpp:577
#5  0x8001464a in run () at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/tools/llvm-lto/llvm-lto.cpp:541
#6  main () at 
/build/llvm-toolchain-10-PvK6ID/llvm-toolchain-10-10.0.0~+rc3/llvm/tools/llvm-lto/llvm-lto.cpp:912

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https://bugs.launchpad.net/bugs/1867173

Title:
  FTBFS with llvm-10

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