Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941045AbcJSRTG (ORCPT ); Wed, 19 Oct 2016 13:19:06 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53930 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751783AbcJSRTE (ORCPT ); Wed, 19 Oct 2016 13:19:04 -0400 Date: Wed, 19 Oct 2016 13:19:01 -0400 (EDT) From: Mikulas Patocka X-X-Sender: mpatocka@file01.intranet.prod.int.rdu2.redhat.com To: Dmitry Safonov cc: 0x7f454c46@gmail.com, oleg@redhat.com, linux-mm@kvack.org, gorcunov@openvz.org, xemul@virtuozzo.com, Thomas Gleixner , linux-kernel@vger.kernel.org Subject: x32 is broken in 4.9-rc1 due to "x86/signal: Add SA_{X32,IA32}_ABI sa_flags" Message-ID: User-Agent: Alpine 2.02 (LRH 1266 2009-07-14) MIME-Version: 1.0 Content-Type: MULTIPART/MIXED; BOUNDARY="185206533-1652417445-1476897543=:24555" X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 19 Oct 2016 17:19:04 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1311 Lines: 32 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --185206533-1652417445-1476897543=:24555 Content-Type: TEXT/PLAIN; charset=ISO-8859-15 Content-Transfer-Encoding: 8BIT Hi In the kernel 4.9-rc1, the x32 support is seriously broken, a x32 process is killed with SIGKILL after returning from any signal handler. I use Debian sid x64-64 distribution with x32 architecture added from debian-ports. I bisected the bug and found out that it is caused by the patch 6846351052e685c2d1428e80ead2d7ca3d7ed913 ("x86/signal: Add SA_{X32,IA32}_ABI sa_flags"). example (strace of a process after receiving the SIGWINCH signal): epoll_wait(10, 0xef6890, 32, -1) = -1 EINTR (Interrupted system call) --- SIGWINCH {si_signo=SIGWINCH, si_code=SI_USER, si_pid=1772, si_uid=0} --- poll([{fd=4, events=POLLOUT}], 1, 0) = 1 ([{fd=4, revents=POLLOUT}]) write(4, "\0", 1) = 1 rt_sigreturn({mask=[INT QUIT ILL TRAP BUS KILL SEGV USR2 PIPE ALRM STKFLT TSTP TTOU URG XCPU XFSZ VTALRM IO PWR SYS RTMIN]}) = 0 --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=NULL} --- +++ killed by SIGSEGV +++ Neopr?vn?n? p??stup do pam?ti (SIGSEGV) Mikulas --185206533-1652417445-1476897543=:24555--