[Bug gcov-profile/48361] New: gcov freezes when using --all-blocks (-a) flag.

[Bug gcov-profile/48361] New: gcov freezes when using --all-blocks (-a) flag.

[lieutenantfeist at hotmail dot de]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

           Summary: gcov freezes when using --all-blocks (-a) flag.
           Product: gcc
           Version: 4.3.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: gcov-profile
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: lieutenantfeist@hotmail.de


lcov stopped processing files and was stuck on particular ones. The problem was
eventually narrowed down to the gcov call which, when enabling error and std
output, showed that it got stuck while trying to create a
'#path#to#current#header.h.gcov' file. Making sure that gcov is not called with
the -a (or --all-blocks) flag enabled, allowed gcov to finish successfully.
This does not apply to all .gcda files being analyzed, just some files which
aren't drastically different from others which get processed fine when using
the -a option.

Chris

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

Marc Glisse <marc.glisse at normalesup dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |marc.glisse at normalesup
                   |                            |dot org

--- Comment #1 from Marc Glisse <marc.glisse at normalesup dot org> 2011-05-20 17:16:38 UTC ---
I noticed the same thing. The files available here:
http://geometrica.saclay.inria.fr/team/Marc.Glisse/tmp/cov-bug/
send gcov-4.6 -a into an infinite loop while they crash gcov-4.7 -a (x86_64
debian testing system).

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[ben at salilab dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

--- Comment #2 from Ben Webb <ben at salilab dot org> 2012-05-21 21:05:49 UTC ---
Created attachment 27465
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27465
inputs.tar.gz

I'm seeing very similar behavior running gcov on the attached files
(inputs.tar.gz contains utility.gcda and utility.gcno).

"gcov utility.gcda -b -c -a -p" hangs indefinitely (at least, it ran for 24
hours before I killed it)

"gcov utility.gcda -b -c -p" returns in less than a second.

This is using Fedora 16's build on an x86_64 system (gcc-4.6.3-2.fc16.x86_64
RPM).

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-07-22
                 CC|                            |steven at gcc dot gnu.org
     Ever Confirmed|0                           |1

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[tim.besard at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

Tim Besard <tim.besard at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tim.besard at gmail dot com

--- Comment #3 from Tim Besard <tim.besard at gmail dot com> ---
Also confirmed with gcc 4.8.2 from Debian, as well as a nightly build of 4.9.0.

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[chan.pen.cheong at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

cautionsign <chan.pen.cheong at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chan.pen.cheong at gmail dot com

--- Comment #4 from cautionsign <chan.pen.cheong at gmail dot com> ---
Just to add on, the issue also happen in gcc 4.4.7 from RHE 6.4. Anyone have
any possible solution or workaround for it? If I disable the all-blocks option,
it will lost the branch coverage data.

Thanks!

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[john.carter at taitradio dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

John Carter <john.carter at taitradio dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |john.carter at taitradio dot com

--- Comment #5 from John Carter <john.carter at taitradio dot com> ---
Seems present in Ubuntu Saucy gcov version 4.8.1

Seems related to / Duplicate of ... 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42945

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[p.padavala at camlintechnologies dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

Prasannanjaneyulu <p.padavala at camlintechnologies dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |p.padavala@camlintechnologi
                   |                            |es.com

--- Comment #16 from Prasannanjaneyulu <p.padavala at camlintechnologies dot com> ---
I still see this problem in GCC 5.4.0. I am on ubuntu 16.04.12 with lcov
version 1.12 and gcov version is 5.4.0.

This is how it is compiling:
----------------------------
g++ -std=c++14 -DHAVE_CONFIG_H -I. -I..  -fprofile-arcs -ftest-coverage
-DGITVERSION=\"2.2.4-2-gc134167-dirty\" -O2 -Wall -Wextra -pedantic
-I/usr/local/include/ -L/usr/local/lib/ -MT Helper-abc.o -MD -MP -MF
.deps/Helper-abc.Tpo -c -o Helper-abc.o `test -f 'abc.cpp' || echo './'`abc.cpp


With branch coverage enabled the lcov call is freezing

lcov --rc lcov_branch_coverage=1 --directory $PWD --capture --output-file
tests_coverage.info

Only the .gcda file generated for abc.cpp is freezing rest it is ok. I am
literally desparate for some workaround. It's been a long standing ticket not
seen any workaround or fix.

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

--- Comment #17 from Martin Liška <marxin at gcc dot gnu.org> ---
Please update to at least GCC 8.4.0, it should be fixed there.
Older releases are not supported right now.

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[p.padavala at camlintechnologies dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

--- Comment #18 from Prasannanjaneyulu <p.padavala at camlintechnologies dot com> ---
Thank you @martin. I am not sure whether ubuntu 16.04 is compatible with gcc
8.4.0. Our app. is currently built for ubuntu 16.04 and I don't know what
breaking changes it could bring if we upgrade gcc.  

Do you know any workaround other than disabling the whole branch coverage?

[Bug gcov-profile/48361] gcov freezes when using --all-blocks (-a) flag.

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=48361

--- Comment #19 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Prasannanjaneyulu from comment #18)
> Thank you @martin. I am not sure whether ubuntu 16.04 is compatible with gcc
> 8.4.0. Our app. is currently built for ubuntu 16.04 and I don't know what
> breaking changes it could bring if we upgrade gcc.  

I strongly recommend to update to a supported GCC. Note that in the meantime
we've fixed many issues that can theoretically affect your application.

> 
> Do you know any workaround other than disabling the whole branch coverage?

No.