From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 00CBF3858D37; Thu, 20 Jan 2022 09:58:56 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 00CBF3858D37 From: "stsp at users dot sourceforge.net" To: gcc-bugs@gcc.gnu.org Subject: [Bug sanitizer/101476] AddressSanitizer check failed, points out a (potentially) non-existing stack error Date: Thu, 20 Jan 2022 09:58:56 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: sanitizer X-Bugzilla-Version: 11.1.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: stsp at users dot sourceforge.net X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Jan 2022 09:58:57 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101476 --- Comment #11 from Stas Sergeev --- The third bug here seems to be that __asan_handle_no_return: https://github.com/gcc-mirror/gcc/blob/master/libsanitizer/asan/asan_rtl.cp= p#L602 also calls sigaltstack() before unpoisoning stacks. I believe this makes the problem much more reproducible, for example the test-case with longjmp() is likely possible too. I've found about that instance by trying to call __asan_handle_no_return() manually as a pthread cleanup handler, in a hope to work around the destructor bug. But it appears __asan_handle_no_return() does the same thing. So the fix should be to move this line: https://github.com/gcc-mirror/gcc/blob/master/libsanitizer/asan/asan_rtl.cp= p#L607 above PlatformUnpoisonStacks() call.=