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=-8.7 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 49218C43381 for ; Thu, 11 Mar 2021 08:18:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 17EA664EC6 for ; Thu, 11 Mar 2021 08:18:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231273AbhCKIRr (ORCPT ); Thu, 11 Mar 2021 03:17:47 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:48176 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231253AbhCKIRT (ORCPT ); Thu, 11 Mar 2021 03:17:19 -0500 Received: by mail-il1-f200.google.com with SMTP id o1so1428319ilg.15 for ; Thu, 11 Mar 2021 00:17:19 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=bC/CQmldrtXQfQKRGB87mv7ghFtpceScOYXwx+xXaqk=; b=NT+Ib20CPLJh8rXooJ5scFK9y5SMweKcQZeU+fbMr3gjdmETOmnv8RJAymB7+E6j6w c6xa5m+Nm2HT6EOqDn5YW+nWG1FvgRkC8zOcZgvGdrm+ZsvxfcQqb9yMHNykkzWcKPyd sAT3mBkGeFer0gsUnIHKOCR+2k026ONp9Sh8tz00AyD+0etVMzgq+vxhuRjvsrPmevX9 HjqNFmqg+Q7C5qTWdaEbvyO2urO45d+Pao4gmuVZpwfWvTNvLU0+AbhJGdpYjgzdhduF tnaV/hN4bCwD5puImo3F6OSZ0xZJKMK7IETUE/yRCVygUJXlIDyIvu2z8JuE9HbhksOs cNiA== X-Gm-Message-State: AOAM530BAZgvhYriR+GZpvSpnI5hjTkYAvxynJzc0KeXzXMiT9rLUumy NII1cfJvFmrORb2xQVlEdLfQ5tLwiRnftFs90zl5o1cxqr0U X-Google-Smtp-Source: ABdhPJwgrrReRlXkPN8CxrAJRWtOGzh4o02tD7J8hhCzPHmCOZtUGS/iiimLtYXQwINpVQgQB43P849C263aOL0OZ3LvBDMgwZA8 MIME-Version: 1.0 X-Received: by 2002:a05:6e02:12b4:: with SMTP id f20mr5952795ilr.220.1615450638515; Thu, 11 Mar 2021 00:17:18 -0800 (PST) Date: Thu, 11 Mar 2021 00:17:18 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000007604cb05bd3e6968@google.com> Subject: [syzbot] BUG: using smp_processor_id() in preemptible code in __do_user_fault From: syzbot To: alexandre.chartre@oracle.com, bristot@redhat.com, linux-kernel@vger.kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, valentin.schneider@arm.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: a74e6a01 Merge tag 's390-5.12-3' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14f67ae6d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7ac5ce2d1160e16 dashboard link: https://syzkaller.appspot.com/bug?extid=a7ee43e564223f195c84 userspace arch: arm Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a7ee43e564223f195c84@syzkaller.appspotmail.com BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor.0/15841 caller is debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:64 CPU: 0 PID: 15841 Comm: syz-executor.0 Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000000 r6:60000113 r5:00000000 r4:83966184 [<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<821108c8>] (dump_stack) from [<82133120>] (check_preemption_disabled+0x118/0x11c lib/smp_processor_id.c:53) r7:8294d26c r6:00000000 r5:82133144 r4:86d725b0 [<82133008>] (check_preemption_disabled) from [<82133144>] (debug_smp_processor_id+0x20/0x24 lib/smp_processor_id.c:64) r7:00000a07 r6:86d72080 r5:0000000b r4:ffffc000 [<82133124>] (debug_smp_processor_id) from [<80217a00>] (harden_branch_predictor arch/arm/include/asm/system_misc.h:24 [inline]) [<82133124>] (debug_smp_processor_id) from [<80217a00>] (__do_user_fault+0x98/0x108 arch/arm/mm/fault.c:142) [<80217968>] (__do_user_fault) from [<80217c90>] (do_page_fault+0x190/0x378 arch/arm/mm/fault.c:357) r9:00000800 r8:84649ebc r7:84649e40 r6:00000a07 r5:ffffc000 r4:89063fb0 [<80217b00>] (do_page_fault) from [<80218054>] (do_DataAbort+0x38/0xb8 arch/arm/mm/fault.c:522) r10:7ef2f914 r9:76f276d0 r8:80217b00 r7:89063fb0 r6:ffffc000 r5:00000a07 r4:83837b38 [<8021801c>] (do_DataAbort) from [<80200dc4>] (__dabt_usr+0x44/0x60 arch/arm/kernel/entry-armv.S:421) Exception stack(0x89063fb0 to 0x89063ff8) 3fa0: ffffff00 20000280 ffffc000 20000250 3fc0: 00000004 20070517 00000140 20ffb000 7ef2f79a 76f276d0 7ef2f914 76f2720c 3fe0: 00000000 76f27020 00000006 00013b18 80000010 ffffffff r8:30c5387d r7:30c5387d r6:ffffffff r5:80000010 r4:00013b18 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.