check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-5ubuntu1-12119810
--
check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-7ubuntu1-12460604
--
check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-8ubuntu1-12480621
--
check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-9ubuntu1-12691282
--
check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-10ubuntu1-12772374
--
check_clamav.c:424:S:cl_scan:test_cl_scanmap_callback_mem_allscan:47: testfiles: 46 != 48
That was 1:3.9.1-10ubuntu2-12845302
--
check_bytecode.c:496:E:arithmetic:test_parallel_load:0: (after this point) Received signal 6 (Aborted)
That was 1:3.9.1-13ubuntu6-13377849
--
check_bytecode.c:496:E:arithmetic:test_parallel_load:0: (after this point) Received signal 6 (Aborted)
That was 1:3.9.1-13ubuntu7-13380349
--
check_bytecode.c:496:E:arithmetic:test_parallel_load:0: (after this point) Received signal 6 (Aborted)
That was 1:3.9.1-16ubuntu1-13392514


The changelogs since the last working version is:
llvm-toolchain-3.9 (1:3.9.1-13ubuntu6) artful; urgency=medium

  * Try to build with -g1 instead of -g on amd64 as well.

 -- Matthias Klose <email address hidden>  Fri, 15 Sep 2017 07:25:22 +0200

llvm-toolchain-3.9 (1:3.9.1-13ubuntu5) artful; urgency=medium

  * build using gold on arm64 and s390x. For backports, arm64 might still
    need the BFD linker, and building with only one or two processes in
    parallel.
  * On arm64 and ppc64el, build with -g1 instead of -g.
  * Set CMAKE_CXX_FLAGS_RELWITHDEBINFO and pass opt_flags.

 -- Matthias Klose <email address hidden>  Sun, 10 Sep 2017 11:06:24 +0200

llvm-toolchain-3.9 (1:3.9.1-13ubuntu4) artful; urgency=medium

  * Fix sanitizer build failure with glibc-2.26.

 -- Matthias Klose <email address hidden>  Fri, 08 Sep 2017 15:34:29 +0200

llvm-toolchain-3.9 (1:3.9.1-13ubuntu2) artful; urgency=medium

  * Link with --no-keep-files-mapped --no-map-whole-files when using
    gold.

 -- Matthias Klose <email address hidden>  Fri, 08 Sep 2017 13:05:29 +0100

llvm-toolchain-3.9 (1:3.9.1-13ubuntu1) artful; urgency=medium

  * Merge from Debian unstable.  Remaining changes:
    - libllvm3.9-dbg, libllvm3.9: Add breaks/replaces for the 16.04 backport.
    - Drop python-lldb-3.9 from lldb-3.9 depends because it's in universe.
llvm-toolchain-3.9 (1:3.9.1-13) unstable; urgency=medium

  * Fix the previous declaration, incorrect gcc comparison

 -- Sylvestre Ledru <email address hidden>  Fri, 01 Sep 2017 09:00:10 +0200

llvm-toolchain-3.9 (1:3.9.1-12ubuntu1) artful; urgency=medium

  * Merge from Debian unstable.  Remaining changes:
    - libllvm3.9-dbg, libllvm3.9: Add breaks/replaces for the 16.04 backport.
    - Drop python-lldb-3.9 from lldb-3.9 depends because it's in universe. 

 -- Gianfranco Costamagna <email address hidden>  Thu, 31 Aug 2017 22:27:12 +0200

llvm-toolchain-3.9 (1:3.9.1-12) unstable; urgency=medium

  * Fix the FTBFS because of -gsplit-dwarf:
    - Only enable it on archs which needs it
    - Only enable it when gcc supports it correctly

 -- Sylvestre Ledru <email address hidden>  Thu, 31 Aug 2017 18:49:20 +0200

llvm-toolchain-3.9 (1:3.9.1-11ubuntu1) artful; urgency=low

  * Merge from Debian unstable.  Remaining changes:
    - libllvm3.9-dbg, libllvm3.9: Add breaks/replaces for the 16.04 backport.
    - Drop python-lldb-3.9 from lldb-3.9 depends because it's in universe.

 -- Gianfranco Costamagna <email address hidden>  Sun, 27 Aug 2017 18:39:23 +0200

llvm-toolchain-3.9 (1:3.9.1-11) unstable; urgency=medium

  [ Sylvestre Ledru ]
  * Remove the --no-discard-stderr option from help2man calls
  * Also add a missing include in ftfbs-gcc.diff to fix a ftbfs
    with gcc 7
  * clang was producing unusable binaries on armv5tel (Closes #873304)
    Thanks to Adrian Bunk for the patch
  * Disable -gsplit-dwarf when using gcc 7 for causing a linking issue
    See https://bugs.llvm.org/show_bug.cgi?id=34140 (Closes: #853524)

  [ Gianfranco Costamagna, John Paul Adrian Glaubitz ]
  * Add powerpcspe to latomic archs

  [ Katsuhiko Nishimra ]
  * Ensure /usr/bin/g++-$(GCC_VERSION) exists (Closes: #871591)

 -- Sylvestre Ledru <email address hidden>  Sun, 18 Jun 2017 19:12:15 +0200


TL;DR - since 1:3.9.1-13ubuntu6-13377849 

Maybe you see something to test-revert, you can do so on your own with the steps provided above in c#18 or any ppa thrown at me.