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| author | Vladimir Mezentsev <vladimir.mezentsev@oracle.com> | 2023-04-16 13:55:48 -0700 |
|---|---|---|
| committer | Vladimir Mezentsev <vladimir.mezentsev@oracle.com> | 2023-04-17 13:01:38 -0700 |
| commit | 35fab451d9ec11a7e02df750fb24feb21e9732b8 (patch) | |
| tree | 64f9f7b28c6ac6a1a300ad29e2c1455ec952333d /gprofng/libcollector/collector.h | |
| parent | 7a515757db9681e86926b7068b3a4a6a2df70299 (diff) | |
| download | gdb-35fab451d9ec11a7e02df750fb24feb21e9732b8.zip gdb-35fab451d9ec11a7e02df750fb24feb21e9732b8.tar.gz gdb-35fab451d9ec11a7e02df750fb24feb21e9732b8.tar.bz2 | |
gprofng: 30360 Seg. Fault when application uses std::thread
We interpose a lot of libC functions (dlopen, fork, pthread_create, etc.).
Some of these functions have versions. For example,
% nm -D /lib64/gprofng/libgp-collector.so | grep thread_create@ | sort
000000000004b420 T pthread_create@GLIBC_2.34
000000000004b490 T pthread_create@GLIBC_2.17
000000000004b500 T pthread_create@GLIBC_2.2.5
000000000004b570 T pthread_create@GLIBC_2.1
000000000004b5e0 T pthread_create@GLIBC_2.0
Our library does not set the default version for symbols.
This is correct because we don't know which libC will be used.
gcc and g++ links differently the version symbols when the default version is
not set. c-linker is using our pthread_create@GLIBC_2.34 and c++-linker is using
our pthread_create@GLIBC_2.0 by default.
The current implementation of the interposed functions is:
If we are in our pthread_create@GLIBC_<NN>,
we use dlvsym (dlflag, "pthread_create", "GLIBC_<NN>") to find and call
the same function from libC.
In the test from PR 30360, pthread_create@GLIBC_2.0 is not in the current libC.
We need to call the default version symbol from libC.
gprofng/ChangeLog
2023-04-16 Vladimir Mezentsev <vladimir.mezentsev@oracle.com>
PR gprofng/30360
* libcollector/iotrace.c: Find and call a default libC version symbol.
* libcollector/dispatcher.c: Likewise.
* libcollector/iotrace.c: Likewise.
* libcollector/linetrace.c: Likewise.
* libcollector/mmaptrace.c: Likewise.
* libcollector/synctrace.c: Likewise.
* libcollector/collector.h (REAL_DCL): Remove an unused argument.
Diffstat (limited to 'gprofng/libcollector/collector.h')
| -rw-r--r-- | gprofng/libcollector/collector.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/gprofng/libcollector/collector.h b/gprofng/libcollector/collector.h index 12a6e15..4de7022 100644 --- a/gprofng/libcollector/collector.h +++ b/gprofng/libcollector/collector.h @@ -50,7 +50,7 @@ #else #define DCL_FUNC_VER(REAL_DCL, sym, ver) \ SYMVER_ATTRIBUTE (__collector_ ## sym, ver) \ - REAL_DCL (__collector_ ## sym, CALL_REAL (sym)) + REAL_DCL (__collector_ ## sym) #endif extern hrtime_t __collector_start_time; |