crash on project creation, probably LLVM 3.9 vs 4.0 related

[Rebecca Palmer]

On creating a new project, kdevelop shows an "Unable to load the project file" error box, then crashes when this is OKd. The backtrace suggests this is https://bugs.debian.org/846410 , reappearing because Ubuntu mesa is now LLVM 4.0:

Thread 1 "kdevelop" received signal SIGSEGV, Segmentation fault.
0x00007fffc1a22a6f in llvm::SmallVectorTemplateBase<llvm::cl::parser<llvm::ScheduleDAGInstrs* (*)(llvm::MachineSchedContext*)>::OptionInfo, false>::grow(unsigned long) () from /usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1
(gdb) bt full
#0 0x00007fffc1a22a6f in llvm::SmallVectorTemplateBase<llvm::cl::parser<llvm::ScheduleDAGInstrs* (*)(llvm::MachineSchedContext*)>::OptionInfo, false>::grow(unsigned long) () from /usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1
No symbol table info available.
#1 0x00007fffc1a22b5e in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-4.0.so.1
No symbol table info available.
#2 0x00007fffa2cd42f2 in ?? () from /usr/lib/x86_64-linux-gnu/libLLVM-3.9.so.1
No symbol table info available.
#3 0x00007ffff7de87ca in ?? () from /lib64/ld-linux-x86-64.so.2
No symbol table info available.
[...]

(This was tested in a zesty chroot, as part of https://bugs.debian.org/848368 testing; as kdevelop is not my usual IDE, I don't have any existing projects to try opening.)

[Rebecca Palmer (rebecca-palmer)]

Rebuilding kdevelop against LLVM 4.0 (via the obvious change to debian/control) avoids this crash; it still fails to create the project (with "please see the Version Control toolview" even though I left Version Control at the default None), but I suspect that's an unrelated "doesn't really work in a minimal chroot" issue.

[Rik Mills (rikmills)]

On 29/03/17 19:04, Rebecca Palmer wrote:
> Rebuilding kdevelop against LLVM 4.0 (via the obvious change to
> debian/control) avoids this crash;

This was discussed yesterday, and corresponding changes submitted to our
CI to initially test build on the stable branch (5.1.0).

https://git.launchpad.net/~kubuntu-packagers/kubuntu-packaging/+git/kdevelop/commit/?h=kubuntu_stable&id=5f25974df24e1c567c98a6509945dcb98b18a801

Have just staged those changes for 5.0.4 in the ppa

http://pad.lv/ppa/rikmills/staging4

if that could be tested that would be useful, as I don't have a box
running what seems to be the affected mesa drivers.

[Rebecca Palmer (rebecca-palmer)]

Switching to llvm-dev/libclang-dev (which are 4.0) does fix this crash bug, and the other error message went away after installing dbus-x11 in the chroot, but I don't know this application well enough to do more general testing.

(You have the wrong bug number in the changelog.)

[Rik Mills (rikmills)]

On 29/03/17 21:50, Rebecca Palmer wrote:
> Switching to llvm-dev/libclang-dev (which are 4.0) does fix this crash
> bug, and the other error message went away after installing dbus-x11 in
> the chroot, but I don't know this application well enough to do more
> general testing.

Thank you

> (You have the wrong bug number in the changelog.)

Seems so. Good spot.

[Launchpad Janitor (janitor)]

This bug was fixed in the package kdevelop - 4:5.0.4-0ubuntu2

---------------
kdevelop (4:5.0.4-0ubuntu2) zesty; urgency=medium

  [ Philip Muškovac ]
  * Revert the versioned clang dep - We don't have the mesa/llvm-default
    mismatch in ubuntu that caused debian bug #846410, so this only
    causes potential problems for us (LP: #1677140)

 -- Rik Mills <email address hidden> Thu, 30 Mar 2017 08:55:28 +0100