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[PATCH] nptl: Open libgcc.so with RTLD_NOW during pthread_cancel
- From: fweimer at redhat dot com (Florian Weimer)
- To: libc-alpha at sourceware dot org
- Date: Wed, 10 Jan 2018 11:49:03 +0100
- Subject: [PATCH] nptl: Open libgcc.so with RTLD_NOW during pthread_cancel
- Authentication-results: sourceware.org; auth=none
Disabling lazy binding reduces stack usage during unwinding.
Note that RTLD_NOW only makes a difference if libgcc.so has not
already been loaded, so this is only a partial fix.
2018-01-10 Florian Weimer <fweimer@redhat.com>
[BZ #22636]
* sysdeps/nptl/unwind-forcedunwind.c (pthread_cancel_init): Open
libgcc.so with RTLD_NOW, to avoid lazy binding during unwind.
diff --git a/sysdeps/nptl/unwind-forcedunwind.c b/sysdeps/nptl/unwind-forcedunwind.c
index ab4350de99..67b8e74b53 100644
--- a/sysdeps/nptl/unwind-forcedunwind.c
+++ b/sysdeps/nptl/unwind-forcedunwind.c
@@ -49,7 +49,7 @@ pthread_cancel_init (void)
return;
}
- handle = __libc_dlopen (LIBGCC_S_SO);
+ handle = __libc_dlopen_mode (LIBGCC_S_SO, RTLD_NOW | __RTLD_DLOPEN);
if (handle == NULL
|| (resume = __libc_dlsym (handle, "_Unwind_Resume")) == NULL