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=-5.7 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_PASS 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 CD367C43381 for ; Sun, 24 Mar 2019 08:29:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8E8F921741 for ; Sun, 24 Mar 2019 08:29:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727808AbfCXI3G (ORCPT ); Sun, 24 Mar 2019 04:29:06 -0400 Received: from mail-io1-f69.google.com ([209.85.166.69]:44462 "EHLO mail-io1-f69.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726160AbfCXI3F (ORCPT ); Sun, 24 Mar 2019 04:29:05 -0400 Received: by mail-io1-f69.google.com with SMTP id c2so5365284ioh.11 for ; Sun, 24 Mar 2019 01:29:05 -0700 (PDT) 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:in-reply-to:message-id:subject :from:to; bh=M+8R9CNl+dwGuvWY+cqskh4FBZP6bvG/g7lGqjy9mEU=; b=QoG07daGRjBBnVP5E1v4XHIK94HX3MSIPh/29Fm5lFfTS+saiietAF5X1atoWtYrhT CQ/3wmV3CmhbdQ4aaiaz6iNYv+hqo+w1PCzkNzt9sdchBIV0LVZlpyyQRQ4gIOw7Xh4E DOQgL9XV9jXv0GwznmOAy2ZgXsjKhmRSbDefWe7z9JeUg+C5fCQacH9cL4yoHbaHCprb 6adMqH8eqn5CPknm8dYgWBXNKR075QrGDCLKvVGuT9bICM61yTR9xm12CEw1zXNE82Ih 7tW+742c8zYNsuCR4fFOsRA6a+8HE1QAKGOoalzNJoWuZySIedMgnFH+HVFp9F1ImlPk RGkw== X-Gm-Message-State: APjAAAWWxw+mgxciH6Qn45UQwrBX+OAi5+k9SfwVWRnyR9ghilaYmuHH 8ZZYMLwuUyG5GFprGSwadGkOZO3z6BrveFyuM2SWWeL9yATm X-Google-Smtp-Source: APXvYqyatBT12S1hMj8F+qReA0Px0PvvnFjpHpFngTY5m2dwePE8PKfWmNBe+Mmk84xZKBIT7Fjn8M6TfjaX9sUnv6a4xq/V4wMz MIME-Version: 1.0 X-Received: by 2002:a5e:a50e:: with SMTP id 14mr12576392iog.63.1553416145069; Sun, 24 Mar 2019 01:29:05 -0700 (PDT) Date: Sun, 24 Mar 2019 01:29:05 -0700 In-Reply-To: <000000000000639f6a0584d11b82@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000083edf60584d2e16e@google.com> Subject: Re: WARNING in arch_install_hw_breakpoint From: syzbot To: bp@alien8.de, frederic@kernel.org, gustavo@embeddedor.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mhiramat@kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org syzbot has found a reproducer for the following crash on: HEAD commit: fd1f297b Merge tag 'drm-fixes-2019-03-22' of git://anongit.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1574f56d200000 kernel config: https://syzkaller.appspot.com/x/.config?x=9a31fb246de2a622 dashboard link: https://syzkaller.appspot.com/bug?extid=370a6b0f11867bf13515 compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1157b7cf200000 Bisection is inconclusive: the bug happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=10ca39b3200000 final crash: https://syzkaller.appspot.com/x/report.txt?x=12ca39b3200000 console output: https://syzkaller.appspot.com/x/log.txt?x=14ca39b3200000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+370a6b0f11867bf13515@syzkaller.appspotmail.com ------------[ cut here ]------------ Can't find any breakpoint slot WARNING: CPU: 0 PID: 8058 at arch/x86/kernel/hw_breakpoint.c:121 arch_install_hw_breakpoint+0x2d6/0x3a0 arch/x86/kernel/hw_breakpoint.c:121 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8058 Comm: syz-executor.1 Not tainted 5.1.0-rc1+ #33 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:arch_install_hw_breakpoint+0x2d6/0x3a0 arch/x86/kernel/hw_breakpoint.c:121 Code: c8 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 0f 0b 48 c7 c7 40 23 65 87 89 45 d4 c6 05 ed 9d 32 08 01 e8 98 43 1b 00 <0f> 0b 8b 45 d4 e9 bc fd ff ff 40 88 75 c8 e8 a7 8e 80 00 0f b6 75 RSP: 0018:ffff8880a512f6d8 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffff8880ae81ec98 RCX: 0000000000000000 RDX: 0000000040000000 RSI: ffffffff815ae266 RDI: ffffed1014a25ecd RBP: ffff8880a512f718 R08: ffff8880857382c0 R09: fffffbfff11335f5 R10: fffffbfff11335f4 R11: ffffffff8899afa3 R12: ffff888085730380 R13: dffffc0000000000 R14: 0000000000000004 R15: 000000000001eca0 hw_breakpoint_add+0xa7/0x130 kernel/events/hw_breakpoint.c:632 event_sched_in kernel/events/core.c:2281 [inline] event_sched_in.isra.0+0x373/0xbf0 kernel/events/core.c:2245 group_sched_in+0xe4/0x3d0 kernel/events/core.c:2317 flexible_sched_in+0x615/0x9c0 kernel/events/core.c:3311 visit_groups_merge+0x336/0x5d0 kernel/events/core.c:3259 ctx_flexible_sched_in kernel/events/core.c:3345 [inline] ctx_sched_in+0x330/0x670 kernel/events/core.c:3390 perf_event_sched_in+0x6e/0xa0 kernel/events/core.c:2426 perf_event_context_sched_in kernel/events/core.c:3430 [inline] __perf_event_task_sched_in+0x609/0x820 kernel/events/core.c:3469 perf_event_task_sched_in include/linux/perf_event.h:1115 [inline] finish_task_switch+0x2c2/0x780 kernel/sched/core.c:2725 context_switch kernel/sched/core.c:2880 [inline] __schedule+0x81f/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 freezable_schedule include/linux/freezer.h:172 [inline] ptrace_stop+0x3fe/0x950 kernel/signal.c:2111 do_jobctl_trap kernel/signal.c:2330 [inline] get_signal+0x1502/0x1d50 kernel/signal.c:2456 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209 Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6b1a2a8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000129 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000458209 RDX: 0000000000000016 RSI: 000000000000002a RDI: 000000000000002a RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000100 R11: 0000000000000246 R12: 00007f6b1a2a96d4 R13: 00000000004c4f84 R14: 00000000004d8bd8 R15: 00000000ffffffff ======================================================