Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Joseph Rushton Wakeling]

On 16/02/17 05:10, Sergio Schvezov wrote:

I'll check your snap first thing once I am at a computer again. From experience
with classic confinement  though, stage-packages to provide runnables are most
of the time the root cause. There was discusssion on having ld set
--library-path in be core snap to have called binaries not reach out to the
system and get confused.


Just to follow up on this: I was able to rebuild the package using snapcraft 
2.27 and `cleanbuild`, and as far as I can tell the result works on 14.04 
without a hitch.  So thank you for all the great work here! :-)


I have an outstanding issue with a linker plugin included in the snap, but that 
supports an optional feature and I didn't expect it to work with 14.04.  In any 
case I'll follow up on that in a separate thread once I have a clearer picture 
of exactly what might be the problem.


Thanks again & best wishes,

-- Joe

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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Sergio Schvezov]

El miércoles, 15 de febrero de 2017 20h'09:36 ART, Joseph Rushton Wakeling 
 escribió:

On 11/02/17 17:31, Joseph Rushton Wakeling wrote:

I just reproduced the issue in a VirtualBox install of 14.04 to get these
details.  Kernel report in kern.log:

Feb 11 17:16:19 vb1404 kernel: [  534.781526] traps: gcc[6209] general
protection ip:7f6632d1b1ee sp:7fff0a09e2f0 error:0 in
libc-2.23.so[7f6632bd8000+1bf000]

And `dmesg | grep -i gcc` gave this output:

[0.00] Linux version 4.4.0-62-generic 
(buildd@lcy01-33) (gcc version

4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #83~14.04.1-Ubuntu SMP Wed Jan 18
18:10:30 UTC 2017 (Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40)
[  534.781526] traps: gcc[6209] general protection ip:7f6632d1b1ee
sp:7fff0a09e2f0 error:0 in libc-2.23.so[7f6632bd8000+1bf000]


This may give enough information for someone to suggest the next step.


I'm not very experienced at interpreting these kinds of 
messages, but if I

understand right they would suggest a libc compatibility issue ... ?


Folks, could I ping on the above?

It seems like a rather severe limitation on the universality of 
the package (at 
a minimum it probably restricts the package to working on 
systems with the same 
or later libc) so I'm curious if anyone has any thoughts on if 
and how this 
could be ameliorated.


I'll check your snap first thing once I am at a computer again. From 
experience with classic confinement  though, stage-packages to provide 
runnables are most of the time the root cause. There was discusssion on 
having ld set --library-path in be core snap to have called binaries not 
reach out to the system and get confused.


Zygmunt, any update on that?


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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Manik Taneja]

jamie,

any insights?

/manik

On Wed, Feb 15, 2017 at 3:09 PM, Joseph Rushton Wakeling <
joseph.wakel...@webdrake.net> wrote:

> On 11/02/17 17:31, Joseph Rushton Wakeling wrote:
>
>> I just reproduced the issue in a VirtualBox install of 14.04 to get these
>> details.  Kernel report in kern.log:
>>
>> Feb 11 17:16:19 vb1404 kernel: [  534.781526] traps: gcc[6209] general
>> protection ip:7f6632d1b1ee sp:7fff0a09e2f0 error:0 in
>> libc-2.23.so[7f6632bd8000+1bf000]
>>
>> And `dmesg | grep -i gcc` gave this output:
>>
>> [0.00] Linux version 4.4.0-62-generic (buildd@lcy01-33) (gcc
>> version
>> 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #83~14.04.1-Ubuntu SMP Wed Jan 18
>> 18:10:30 UTC 2017 (Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40)
>> [  534.781526] traps: gcc[6209] general protection ip:7f6632d1b1ee
>> sp:7fff0a09e2f0 error:0 in libc-2.23.so[7f6632bd8000+1bf000]
>>
>> This may give enough information for someone to suggest the next step.
>>>
>>
>> I'm not very experienced at interpreting these kinds of messages, but if I
>> understand right they would suggest a libc compatibility issue ... ?
>>
>
> Folks, could I ping on the above?
>
> It seems like a rather severe limitation on the universality of the
> package (at a minimum it probably restricts the package to working on
> systems with the same or later libc) so I'm curious if anyone has any
> thoughts on if and how this could be ameliorated.
>
>
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> an/listinfo/snapcraft
>
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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Joseph Rushton Wakeling]

On 11/02/17 17:31, Joseph Rushton Wakeling wrote:

I just reproduced the issue in a VirtualBox install of 14.04 to get these
details.  Kernel report in kern.log:

Feb 11 17:16:19 vb1404 kernel: [  534.781526] traps: gcc[6209] general
protection ip:7f6632d1b1ee sp:7fff0a09e2f0 error:0 in
libc-2.23.so[7f6632bd8000+1bf000]

And `dmesg | grep -i gcc` gave this output:

[0.00] Linux version 4.4.0-62-generic (buildd@lcy01-33) (gcc version
4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #83~14.04.1-Ubuntu SMP Wed Jan 18
18:10:30 UTC 2017 (Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40)
[  534.781526] traps: gcc[6209] general protection ip:7f6632d1b1ee
sp:7fff0a09e2f0 error:0 in libc-2.23.so[7f6632bd8000+1bf000]


This may give enough information for someone to suggest the next step.


I'm not very experienced at interpreting these kinds of messages, but if I
understand right they would suggest a libc compatibility issue ... ?


Folks, could I ping on the above?

It seems like a rather severe limitation on the universality of the package (at 
a minimum it probably restricts the package to working on systems with the same 
or later libc) so I'm curious if anyone has any thoughts on if and how this 
could be ameliorated.


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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Joseph Rushton Wakeling]

On 11/02/17 17:31, Joseph Rushton Wakeling wrote:

And `dmesg | grep -i gcc` gave this output:


Slightly more detailed dmesg output from `dmesg | grep -e "gcc" -e "ldc2"`:

[0.00] Linux version 4.4.0-62-generic (buildd@lcy01-33) (gcc version 
4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #83~14.04.1-Ubuntu SMP Wed Jan 18 
18:10:30 UTC 2017 (Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40)
[  249.403368] audit: type=1400 audit(1486829494.212:33): apparmor="STATUS" 
operation="profile_load" profile="unconfined" name="snap.ldc2.ldc-profdata" 
pid=5600 comm="apparmor_parser"
[  249.409009] audit: type=1400 audit(1486829494.220:34): apparmor="STATUS" 
operation="profile_load" profile="unconfined" name="snap.ldc2.ldc-prune-cache" 
pid=5602 comm="apparmor_parser"
[  249.413008] audit: type=1400 audit(1486829494.220:35): apparmor="STATUS" 
operation="profile_load" profile="unconfined" name="snap.ldc2.ldc2" pid=5604 
comm="apparmor_parser"
[  249.426591] audit: type=1400 audit(1486829494.240:36): apparmor="STATUS" 
operation="profile_load" profile="unconfined" name="snap.ldc2.ldmd2" pid=5606 
comm="apparmor_parser"
[  534.781526] traps: gcc[6209] general protection ip:7f6632d1b1ee 
sp:7fff0a09e2f0 error:0 in libc-2.23.so[7f6632bd8000+1bf000]



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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Joseph Rushton Wakeling]

On 11/02/17 00:48, Seth Arnold wrote:

Hi Joe, can you grab the dmesg output that might include DENIED lines as
well as the kernel's segfault report?


Sure -- thanks for the thought! :-)

I just reproduced the issue in a VirtualBox install of 14.04 to get these 
details.  Kernel report in kern.log:


Feb 11 17:16:19 vb1404 kernel: [  534.781526] traps: gcc[6209] general 
protection ip:7f6632d1b1ee sp:7fff0a09e2f0 error:0 in 
libc-2.23.so[7f6632bd8000+1bf000]


And `dmesg | grep -i gcc` gave this output:

[0.00] Linux version 4.4.0-62-generic (buildd@lcy01-33) (gcc version 
4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04.3) ) #83~14.04.1-Ubuntu SMP Wed Jan 18 
18:10:30 UTC 2017 (Ubuntu 4.4.0-62.83~14.04.1-generic 4.4.40)
[  534.781526] traps: gcc[6209] general protection ip:7f6632d1b1ee 
sp:7fff0a09e2f0 error:0 in libc-2.23.so[7f6632bd8000+1bf000]



This may give enough information for someone to suggest the next step.


I'm not very experienced at interpreting these kinds of messages, but if I 
understand right they would suggest a libc compatibility issue ... ?


Thanks & best wishes,

-- Joe


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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Seth Arnold]

On Fri, Feb 10, 2017 at 09:41:52PM +0100, Joseph Rushton Wakeling wrote:
> Attempting to compile this program resulted in a segfault in GCC (which LDC
> invokes in order to link programs).
[...]
> Anyway, does anyone have any thoughts?

Hi Joe, can you grab the dmesg output that might include DENIED lines as
well as the kernel's segfault report?

This may give enough information for someone to suggest the next step.

Thanks


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Re: LDC compiler snap issues on 14.04 (ABI compatibility?)

[Joseph Rushton Wakeling]

On 10/02/17 21:41, Joseph Rushton Wakeling wrote:

Running `ldc -v` for verbose output, the precise call that segfaulted was:

/usr/bin/gcc hello.o -o hello -L/snap/ldc2/3/bin/../lib -lphobos2-ldc
-ldruntime-ldc -Wl,--gc-sections -lrt -ldl -lpthread -lm -m64

My suspicion is that that `libphobos2-ldc` and `libdruntime-ldc`, which are
provided as precompiled static libraries in the snap package, are not ABI
compatible with 14.04, hence the segfault.


For the avoidance of doubt: none of the other linked libraries are provided in 
the snap itself, only libdruntime-ldc and libphobos2-ldc.


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