diff options
| author | Florian Weimer <fweimer@redhat.com> | 2021-04-21 11:50:43 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-04-21 11:50:43 +0200 |
| commit | a64afc225240b2b27129ccfb0516d7c958b98040 (patch) | |
| tree | 02bdfc42d7b25fd2f537e6aad77be75f33af44ba /nptl/pthread_create.c | |
| parent | aaa23c35071537e2dcf5807e956802ed215210aa (diff) | |
| download | glibc-a64afc225240b2b27129ccfb0516d7c958b98040.zip glibc-a64afc225240b2b27129ccfb0516d7c958b98040.tar.gz glibc-a64afc225240b2b27129ccfb0516d7c958b98040.tar.bz2 | |
nptl_db: Support different libpthread/ld.so load orders (bug 27744)
libthread_db is loaded once GDB encounters libpthread, and at this
point, ld.so may not have been processed by GDB yet. As a result,
_rtld_global cannot be accessed by regular means from libthread_db.
To make this work until GDB can be fixed, acess _rtld_global through
a pointer stored in libpthread.
The new test does not reproduce bug 27744 with
--disable-hardcoded-path-in-tests, but is still a valid smoke test.
With --enable-hardcoded-path-in-tests, it is necessary to avoid
add-symbol-file because this can tickle a GDB bug.
Fixes commit 1daccf403b1bd86370eb94edca794dc106d02039 ("nptl: Move
stack list variables into _rtld_global").
Tested-by: Emil Velikov <emil.velikov@collabora.com>
Diffstat (limited to 'nptl/pthread_create.c')
| -rw-r--r-- | nptl/pthread_create.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c index 6c645af..f13d8e4 100644 --- a/nptl/pthread_create.c +++ b/nptl/pthread_create.c @@ -51,6 +51,14 @@ static td_thr_events_t __nptl_threads_events __attribute_used__; /* Pointer to descriptor with the last event. */ static struct pthread *__nptl_last_event __attribute_used__; +#ifdef SHARED +/* This variable is used to access _rtld_global from libthread_db. If + GDB loads libpthread before ld.so, it is not possible to resolve + _rtld_global directly during libpthread initialization. */ +static struct rtld_global *__nptl_rtld_global __attribute_used__ + = &_rtld_global; +#endif + /* Number of threads running. */ unsigned int __nptl_nthreads = 1; |