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nptl_db: Support different libpthread/ld.so load orders (bug 27744)

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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 1daccf403b ("nptl: Move
stack list variables into _rtld_global").

Tested-by: Emil Velikov <emil.velikov@collabora.com>
This commit is contained in:
Florian Weimer
2021-04-21 11:50:43 +02:00
parent aaa23c3507
commit a64afc2252
7 changed files with 180 additions and 11 deletions
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8
nptl/pthread_create.c
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@ -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;