https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89740
--- Comment #4 from bert hubert ---
I did a longer writeup here, where I tentatively conclude this is not a bug,
just highly unfortunate: https://ds9a.nl/articles/posts/iostreams-unexpected/
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89740
--- Comment #3 from bert hubert ---
Note that in
https://stackoverflow.com/questions/12605725/basic-thread-locking-in-c11/12608911#12608911
we read the calling flush() from two threads at the same time is not legal if
the streams are
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89740
--- Comment #2 from bert hubert ---
Created attachment 45982
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45982=edit
reproduction that actually shows the bug
This is the version of the reproduction that exhibits the problem. The other
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89740
--- Comment #1 from bert hubert ---
Comment on attachment 45981
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45981
a small reproduction for this bug.
>#include
>#include
>#include
>#include
>
>using namespace std;
>
>void
rity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ahu at ds9a dot nl
Target Milestone: ---
Created attachment 45981
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=45981=edit
a small reproduction for t
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66971
bert hubert changed:
What|Removed |Added
CC||ahu at ds9a dot nl
--- Comment #1 from
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: ahu at ds9a dot nl
Created attachment 31194
-- http://gcc.gnu.org/bugzilla/attachment.cgi?id=31194action=edit
small test file that fails to compile
Thanks
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59079
bert hubert ahu at ds9a dot nl changed:
What|Removed |Added
Status|UNCONFIRMED |RESOLVED
++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ahu at ds9a dot nl
GCC build triplet: x86_64-unknown-linux-gnu
GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41267
at gcc dot gnu dot org
ReportedBy: ahu at ds9a dot nl
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26633
--- Comment #3 from ahu at ds9a dot nl 2006-03-10 17:54 ---
Subject: Re: [4.1/4.2 Regression] Minimal c++ program using threads and
exceptions crashes when compiled statically
Sure this is (exactly) related? I tried to pull in some of the symbols that
might be missing to no avail
--- Comment #4 from ahu at ds9a dot nl 2006-03-10 20:44 ---
Andrew Pinski tells me this is a glibc TLS bug and that it should be reported
to Ubuntu, which I have done here:
https://launchpad.net/distros/ubuntu/+source/glibc/+bug/34362
The reduced testcase is:
#include pthread.h
void
Component: tree-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ahu at ds9a dot nl
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26570
--- Comment #3 from ahu at ds9a dot nl 2006-03-05 23:42 ---
Thanks Nicholas,
I can run the command you suggest without errors (I saved the file as
exploit.cc). However, if I compile first with -fprofile-generate, then run it
once, and then add -fprofile-use, it reports:
$ g++ -O2
--- Comment #7 from ahu at ds9a dot nl 2006-03-06 00:10 ---
The crasher bugs go away from release 4.1.0 when never running with
-fprofile-use and -fprofile-generate simultaneously.
There is another 'checksum mismatch' issue with PowerDNS:
base64.cc: In function âcharunnamed
--- Comment #10 from ahu at ds9a dot nl 2005-11-08 10:15 ---
An easy solution might be to check for __gthread_active_p() in
bits/basic_string before calling __exchange_and_add, and to do this locally and
non-atomically otherwise.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24704
Product: gcc
Version: 4.0.2
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: ahu at ds9a dot nl
GCC build triplet: i486-linux-gnu
GCC host
--- Comment #1 from ahu at ds9a dot nl 2005-11-07 12:39 ---
that would be http://wiki.powerdns.com - not sure how I mistyped that.
Also, the application in question is rather string-happy, which is probably why
the exchange_and_add thing shows up so much.
--
http://gcc.gnu.org
--- Comment #3 from ahu at ds9a dot nl 2005-11-07 17:00 ---
I've now verified that even when the entire compiler is compiled with
--enable-threads=single, the resulting libstdc++ does the full 'lock; xadd'
thing in __exchange_and_add, which I consider a bug (and more importantly, so
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