1
0
mirror of https://sourceware.org/git/glibc.git synced 2025-05-17 18:01:13 +03:00
Stefan Liebler 890b7a4b33 S390: Fix "backtrace() returns infinitely deep stack frames with makecontext()" [BZ #18508].
On s390/s390x backtrace(buffer, size) returns the series of called functions until
"makecontext_ret" and additional entries (up to "size") with "makecontext_ret".
GDB-backtrace is also warning:
"Backtrace stopped: previous frame identical to this frame (corrupt stack?)"

To reproduce this scenario you have to setup a new context with makecontext()
and activate it with setcontext(). See e.g. cf() function in testcase stdlib/tst-makecontext.c.
Or see bug in libgo "Bug 66303 - runtime.Caller() returns infinitely deep stack frames
on s390x " (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66303).

This patch omits the cfi_startproc/cfi_endproc directives in ENTRY/END macro of
__makecontext_ret. Thus no frame information is generated in .eh_frame and backtrace
stops after __makecontext_ret. There is also no .eh_frame info for _start or
thread_start functions.

ChangeLog:

	[BZ #18508]
	* stdlib/Makefile ($(objpfx)tst-makecontext3):
	Depend on $(libdl).
	* stdlib/tst-makecontext.c (cf): Test if _Unwind_Backtrace
	is not called infinitely times.
	(backtrace_helper): New function.
	(trace_arg): New struct.
	(st1): Enlarge stack size.
	* sysdeps/unix/sysv/linux/s390/s390-32/__makecontext_ret.S:
	(__makecontext_ret): Omit cfi_startproc and cfi_endproc.
	* sysdeps/unix/sysv/linux/s390/s390-64/__makecontext_ret.S:
	Likewise.
2015-07-07 16:11:14 +02:00
..
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-05-26 22:27:24 +05:30
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-06-09 14:56:21 -03:00
2015-06-04 18:58:36 -03:00
2015-06-09 18:10:19 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-01-06 08:23:58 -08:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-06-09 14:56:21 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-01-06 08:23:58 -08:00
2015-05-22 17:38:06 -03:00
2015-05-22 17:38:06 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00
2015-06-04 18:58:36 -03:00