From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8162AC433E0 for ; Thu, 11 Jun 2020 06:46:20 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BB79D20812 for ; Thu, 11 Jun 2020 06:46:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BB79D20812 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bugzilla.kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 49jDsP47cYzDqgl for ; Thu, 11 Jun 2020 16:46:17 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=198.145.29.99; helo=mail.kernel.org; envelope-from=srs0=e5uh=7y=bugzilla.kernel.org=bugzilla-daemon@kernel.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=bugzilla.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 49jDpW6zwkzDq9b for ; Thu, 11 Jun 2020 16:43:47 +1000 (AEST) From: bugzilla-daemon@bugzilla.kernel.org To: linuxppc-dev@lists.ozlabs.org Subject: [Bug 205183] PPC64: Signal delivery fails with SIGSEGV if between about 1KB and 4KB bytes of stack remain Date: Thu, 11 Jun 2020 06:43:44 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo platform_ppc-64@kernel-bugs.osdl.org X-Bugzilla-Product: Platform Specific/Hardware X-Bugzilla-Component: PPC-64 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: daniel@linux.ibm.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: platform_ppc-64@kernel-bugs.osdl.org 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: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" https://bugzilla.kernel.org/show_bug.cgi?id=3D205183 --- Comment #4 from Daniel Black (daniel@linux.ibm.com) --- Still broken. danielgb@talos2:~$ gcc -g -Wall -O stacktest.c danielgb@talos2:~$ ./a.out 1240000 & [1] 494618 danielgb@talos2:~$ cat /proc/$(pidof a.out)/maps | grep stack 7fffcde80000-7fffcdfb0000 rw-p 00000000 00:00 0=20=20=20=20=20=20=20=20=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 [stack] danielgb@talos2:~$ kill -USR1 %1 danielgb@talos2:~$ signal delivered, stack base 0x7fffcdfb0000 top 0x7fffcde81427 (1240025 used) [1]+ Done ./a.out 1240000 danielgb@talos2:~$ ./a.out 1241000 & [1] 494677 danielgb@talos2:~$ kill -USR1 %1 danielgb@talos2:~$=20 [1]+ Segmentation fault ./a.out 1241000 danielgb@talos2:~$=20 danielgb@talos2:~$ dmesg | grep a.out [10617.616145] a.out[494587]: bad frame in setup_rt_frame: 00007fffdea30010= nip 000000011a0a09fc lr 00007fffa1c404c8 [10865.752876] a.out[494677]: bad frame in setup_rt_frame: 00007fffcc420030= nip 0000000135a70a3c lr 00007fff952604c8 danielgb@talos2:~$ uname -a Linux talos2 5.7.0-rc5-77151-gfea086b627a0 #1 SMP Mon May 11 16:00:00 AEST = 2020 ppc64le ppc64le ppc64le GNU/Linux --=20 You are receiving this mail because: You are watching the assignee of the bug.=