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[2.27 COMMITTED] Linux i386: tst-bz21269 triggers SIGBUS on some kernels

In addition to SIGSEGV and SIGILL, SIGBUS is also a possible signal
generated by the kernel.

(cherry picked from commit 4d76d3e59d31aa690f148fc0c95cc0c581aed3e8)

2018-03-29  Florian Weimer  <fweimer@redhat.com>

	* sysdeps/unix/sysv/linux/i386/tst-bz21269.c (do_test): Also
	capture SIGBUS.

diff --git a/sysdeps/unix/sysv/linux/i386/tst-bz21269.c b/sysdeps/unix/sysv/linux/i386/tst-bz21269.c
index 353e36507d..6ee3fc62be 100644
--- a/sysdeps/unix/sysv/linux/i386/tst-bz21269.c
+++ b/sysdeps/unix/sysv/linux/i386/tst-bz21269.c
@@ -177,6 +177,8 @@ do_test (void)
   xsethandler (SIGSEGV, sigsegv_handler, 0);
   /* 32-bit kernels send SIGILL instead of SIGSEGV on IRET faults.  */
   xsethandler (SIGILL, sigsegv_handler, 0);
+  /* Some kernels send SIGBUS instead.  */
+  xsethandler (SIGBUS, sigsegv_handler, 0);
 
   thread = xpthread_create (0, threadproc, 0);