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[209.132.180.67]) by mx.google.com with ESMTP id w16si19221367plp.329.2019.07.16.12.38.21; Tue, 16 Jul 2019 12:38:40 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2018-07-02 header.b=YpTAq4r4; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388366AbfGPThs (ORCPT + 99 others); Tue, 16 Jul 2019 15:37:48 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:34346 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726213AbfGPThr (ORCPT ); Tue, 16 Jul 2019 15:37:47 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x6GJYUkg179179; Tue, 16 Jul 2019 19:35:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=subject : to : cc : references : from : message-id : date : mime-version : in-reply-to : content-type : content-transfer-encoding; s=corp-2018-07-02; bh=1qfDR8LOOclMEHtdDoRSRWksboxo8pc0ldxYjGRGB8Q=; b=YpTAq4r4uAFQUHam9fEklhu/CVb/EBKs2ZOZQBIqX7/y2HSXjvp1yElrgsjlEvD2soPA 5n5oEhfNcwy71MIoQRJKFYaB+yYFTwpjLb8o+BfmjL0NPnxUw7gFvEVfjZcwfYfCaF1D jV6ApFOotHG/l+nQ95DsWTBup62xwlQeERabpWfY2sMeTY4lUJakAfvikKN0guVYAKyW EpYskAuVdcNJl4xFZHgPk+WrI3Q/1s0wL3Joh+gNEQQ3g0YzmsfdBMW9bisDwAGtX20s 2FZJ7FoC7jZQsUz3JOJmxwuDZMrSZrOjlzjkWrwLfJetu5KC905Bt5uBUXKaeqdCS9kC RQ== Received: from aserp3030.oracle.com (aserp3030.oracle.com [141.146.126.71]) by userp2130.oracle.com with ESMTP id 2tq6qtpn1u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 16 Jul 2019 19:35:37 +0000 Received: from pps.filterd (aserp3030.oracle.com [127.0.0.1]) by aserp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x6GJWoiQ117858; Tue, 16 Jul 2019 19:35:36 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by aserp3030.oracle.com with ESMTP id 2tq5bckgmb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 16 Jul 2019 19:35:36 +0000 Received: from abhmp0017.oracle.com (abhmp0017.oracle.com [141.146.116.23]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id x6GJZR4X007538; Tue, 16 Jul 2019 19:35:32 GMT Received: from [10.175.27.185] (/10.175.27.185) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 16 Jul 2019 19:35:26 +0000 Subject: Re: [PATCH v3 0/6] Tracing vs CR2 To: Peter Zijlstra , tglx@linutronix.de, bp@alien8.de, mingo@kernel.org, rostedt@goodmis.org, luto@kernel.org, torvalds@linux-foundation.org Cc: hpa@zytor.com, dave.hansen@linux.intel.com, jgross@suse.com, linux-kernel@vger.kernel.org, zhe.he@windriver.com, joel@joelfernandes.org, devel@etsukata.com References: <20190711114054.406765395@infradead.org> From: Vegard Nossum Message-ID: <4c71e14d-3a32-c3bb-8e3b-6e5100853192@oracle.com> Date: Tue, 16 Jul 2019 21:33:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <20190711114054.406765395@infradead.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9320 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907160239 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9320 signatures=668688 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1907160239 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/11/19 1:40 PM, Peter Zijlstra wrote: > Hi, > > Here's the latest (and hopefully final) set of tracing vs CR2 patches. > > They are basically the same as v2, with only minor edits and tags collected > from the last review. > > Please consider. > Hi, I ran my own battery of tests on your patch set on top of 5ad18b2e60b75c7297a998dea702451d33a052ed and ran into this: ------------[ cut here ]------------ General protection fault in user access. Non-canonical address? WARNING: CPU: 0 PID: 5039 at arch/x86/mm/extable.c:126 ex_handler_uaccess+0x5d/0x70 CPU: 0 PID: 5039 Comm: init Not tainted 5.2.0+ #124 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 RIP: 0010:ex_handler_uaccess+0x5d/0x70 Code: 5d 41 5c c3 e8 c4 8e 0e 00 80 3d e5 74 1e 01 00 75 d3 e8 b6 8e 0e 00 48 c7 c7 10 a7 fb 81 c6 05 d0 74 1e 01 01 e8 d1 43 01 00 <0f> 0b eb b7 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 RSP: 0000:fffffe000000fc48 EFLAGS: 00010086 RAX: 0000000000000000 RBX: ffffffff81c07dac RCX: ffffffff811a887c RDX: 0000000000000000 RSI: ffffffff8289f05f RDI: 0000000000000093 RBP: fffffe000000fcb8 R08: 00000036fe0f15d3 R09: 000000000000003f R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000 FS: 00005555563ab8c0(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000001ff7 CR3: 000000003c804002 CR4: 00000000003606f0 DR0: 0000000040209100 DR1: 00000000402091a1 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 00000000000b062a Call Trace: <#DB> fixup_exception+0x50/0x6a do_general_protection+0x40/0x160 general_protection+0x2d/0x40 RIP: 0010:arch_stack_walk_user+0x71/0x100 Code: 00 48 83 e8 10 49 39 c4 77 45 4c 8b 04 24 4c 89 e3 4d 89 fd 4c 89 fd 41 83 87 98 0a 00 00 01 0f 01 cb 0f ae e8 31 c0 4c 89 e2 <4c> 8b 33 4d 89 f4 85 c0 75 7a 48 8b 73 08 0f 01 ca 85 c0 74 1f 65 RSP: 0000:fffffe000000fd68 EFLAGS: 00050046 RAX: 0000000000000000 RBX: 854163717acc2789 RCX: ffffffff811ca27b RDX: 854163717acc2789 RSI: 0000000040209102 RDI: fffffe000000fdb8 RBP: ffff88803d55d040 R08: ffffc9000520bf58 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 854163717acc2789 R13: ffff88803d55d040 R14: 0000000000000093 R15: ffff88803d55d040 ? stack_trace_consume_entry+0x4b/0x80 ? arch_stack_walk_user+0x34/0x100 ? profile_setup.cold+0xc1/0xc1 stack_trace_save_user+0x71/0x9c trace_buffer_unlock_commit_regs+0x1ae/0x270 trace_event_buffer_commit+0x90/0x240 trace_event_raw_event_preemptirq_template+0x9a/0x100 ? debug+0x16/0x70 ? perf_trace_preemptirq_template+0x120/0x120 ? trace_hardirqs_off_thunk+0x1a/0x1c trace_hardirqs_off_caller+0xf4/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? debug+0x11/0x70 debug+0x16/0x70 RIP: 0010:copy_user_generic_unrolled+0xa0/0xc0 Code: 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 0f 1f 40 00 RSP: 0000:ffffc9000520be38 EFLAGS: 00040202 RAX: ffff88803d55d09c RBX: ffff88803d55d040 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000040209102 RDI: ffffc9000520be76 RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00007ffffffff000 R13: 0000000040209102 R14: ffffc9000520be76 R15: 0000000000000000 __probe_kernel_read+0x57/0x90 is_prefetch.isra.0+0xb5/0x210 ? tracer_hardirqs_on+0x53/0x1a0 __bad_area_nosemaphore+0x9e/0x220 __do_page_fault+0x483/0x630 ? async_page_fault+0x8/0x40 async_page_fault+0x36/0x40 RIP: 0033:0x40209102 Code: 00 00 49 bc 00 20 23 40 00 00 00 00 49 bd 00 00 d0 40 00 00 00 00 49 be ff ff ff ff ff ff ff ff 49 bf 00 50 80 40 00 00 00 00 <9c> 48 81 0c 24 00 04 00 00 48 81 0c 24 00 00 04 00 9d ff 2c 25 00 RSP: 002b:0000000000001fff EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00000000402090b0 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000041ebb000 RBP: 854163717acc2789 R08: 0000000000000001 R09: b1f39cc399a61ebb R10: 00007ffeab175000 R11: 0000000000000360 R12: 0000000040232000 R13: 0000000040d00000 R14: ffffffffffffffff R15: 0000000040805000 ---[ end trace e5e49800ff5aa5ed ]--- PANIC: double fault, error_code: 0x0 CPU: 0 PID: 5039 Comm: init Tainted: G W 5.2.0+ #124 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f008 EFLAGS: 00010093 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f088 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00005555563ab8c0(0000) GS:ffff88803ec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffe000000eff8 CR3: 000000003c804002 CR4: 00000000003606f0 DR0: 0000000040209100 DR1: 00000000402091a1 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000b062a Call Trace: <#DB> trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f148 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f1c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f288 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f308 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f3c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f448 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f508 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f588 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f648 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f6c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f788 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f808 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f8c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f948 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000fa08 EFLAGS: 00010083 ORIG_RAX: 0000000000000000 RAX: 0000000000006004 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000006004 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000fa88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 async_page_fault+0x16/0x40 RIP: 0010:fixup_bad_iret+0x6/0x50 Code: 2d a8 00 00 00 48 39 f8 74 0b b9 15 00 00 00 48 89 c7 f3 48 a5 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 48 89 fd <65> 48 8b 3d a6 31 f2 7e 48 8b b5 a0 00 00 00 4c 8d a7 50 ff ff ff RSP: 0000:fffffe000000fb48 EFLAGS: 00010082 ORIG_RAX: 0000000000000000 RAX: 800000003c804002 RBX: 0000000000000000 RCX: ffffffff81a00b97 RDX: 0000000000000000 RSI: ffffffff81a013a8 RDI: fffffe000000fb60 RBP: fffffe000000fb60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? native_iret+0x7/0x7 ? general_protection+0x8/0x40 error_entry+0xe5/0xf0 RIP: 0010:native_irq_return_iret+0x0/0x2 Code: 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 0c 00 00 00 90 90 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57 0f 01 f8 0f 1f 00 66 90 0f 20 df 48 0f ba ef 3f 48 81 e7 RSP: 0000:fffffe000000fc18 EFLAGS: 00010046 ORIG_RAX: 0000000000000000 RAX: fffffe000000fe08 RBX: ffffffff81c07dac RCX: ffff88803c824000 RDX: ffffffff8126a228 RSI: 0000000040209100 RDI: 0000000000000000 RBP: fffffe000000fcb8 R08: fffffe000000fec0 R09: ffffffff8125b177 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000 ? general_protection+0x8/0x40 ? perf_exclude_event+0x67/0x90 ? perf_bp_event+0x98/0xe0 RIP: 0000:0x2 Code: Bad RIP value. RSP: 0000:0000000005080021 EFLAGS: 00000000 ? ex_handler_uaccess+0x5d/0x70 ? fixup_exception+0x50/0x6a ? do_general_protection+0x40/0x160 ? general_protection+0x2d/0x40 ? stack_trace_consume_entry+0x4b/0x80 ? arch_stack_walk_user+0x71/0x100 ? arch_stack_walk_user+0x34/0x100 ? profile_setup.cold+0xc1/0xc1 ? stack_trace_save_user+0x71/0x9c ? __this_cpu_preempt_check+0xc/0xc6 ? hw_breakpoint_exceptions_notify+0x120/0x1c0 ? notifier_call_chain+0x8e/0xb0 ? atomic_notifier_call_chain+0x37/0x40 ? notify_die+0x5c/0x80 ? trace_hardirqs_off_caller+0x20/0x150 ? trace_hardirqs_off_thunk+0x1a/0x1c ? debug_smp_processor_id+0x28/0xd0 ? paranoid_exit+0xb/0xb0 ? copy_user_enhanced_fast_string+0xe/0x20 WARNING: stack recursion on stack type 9 Kernel panic - not syncing: Machine halted. CPU: 0 PID: 5039 Comm: init Tainted: G W 5.2.0+ #124 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014 Call Trace: <#DF> dump_stack+0xe1/0x133 panic+0x159/0x3d8 ? get_cpu_entry_area+0x8/0x30 df_debug+0x24/0x2d do_double_fault+0x94/0xf0 double_fault+0x2c/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f008 EFLAGS: 00010093 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f088 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 <#DB> trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f148 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f1c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f288 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f308 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f3c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f448 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f508 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f588 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f648 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f6c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f788 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f808 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000f8c8 EFLAGS: 00010093 ORIG_RAX: 0000000000000000 RAX: 0000000000016cc0 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000016cc0 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000f948 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 async_page_fault+0x16/0x40 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 Code: 82 e8 74 2d f8 ff 48 89 9d 10 01 00 00 48 89 ee 5b 4c 89 e7 5d 41 5c e9 8e 5d 12 00 5b b8 f4 ff ff ff 5d 41 5c c3 0f 1f 40 00 <65> 48 8b 04 25 c0 6c 01 00 65 8b 15 78 ba df 7e 81 e2 00 01 1f 00 RSP: 0000:fffffe000000fa08 EFLAGS: 00010083 ORIG_RAX: 0000000000000000 RAX: 0000000000006004 RBX: ffffffff81a01436 RCX: ffffffff81a00b97 RDX: 0000000000006004 RSI: ffffffff81a01428 RDI: ffffffff81a01436 RBP: fffffe000000fa88 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? async_page_fault+0x16/0x40 ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 ? async_page_fault+0x16/0x40 trace_hardirqs_off_caller+0x10/0x150 trace_hardirqs_off_thunk+0x1a/0x1c ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x40 async_page_fault+0x16/0x40 RIP: 0010:fixup_bad_iret+0x6/0x50 Code: 2d a8 00 00 00 48 39 f8 74 0b b9 15 00 00 00 48 89 c7 f3 48 a5 c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 48 89 fd <65> 48 8b 3d a6 31 f2 7e 48 8b b5 a0 00 00 00 4c 8d a7 50 ff ff ff RSP: 0000:fffffe000000fb48 EFLAGS: 00010082 ORIG_RAX: 0000000000000000 RAX: 800000003c804002 RBX: 0000000000000000 RCX: ffffffff81a00b97 RDX: 0000000000000000 RSI: ffffffff81a013a8 RDI: fffffe000000fb60 RBP: fffffe000000fb60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ? native_iret+0x7/0x7 ? general_protection+0x8/0x40 error_entry+0xe5/0xf0 RIP: 0010:native_irq_return_iret+0x0/0x2 Code: 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 08 e9 0c 00 00 00 90 90 66 2e 0f 1f 84 00 00 00 00 00 f6 44 24 20 04 75 02 <48> cf 57 0f 01 f8 0f 1f 00 66 90 0f 20 df 48 0f ba ef 3f 48 81 e7 RSP: 0000:fffffe000000fc18 EFLAGS: 00010046 ORIG_RAX: 0000000000000000 RAX: fffffe000000fe08 RBX: ffffffff81c07dac RCX: ffff88803c824000 RDX: ffffffff8126a228 RSI: 0000000040209100 RDI: 0000000000000000 RBP: fffffe000000fcb8 R08: fffffe000000fec0 R09: ffffffff8125b177 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000000d R13: 000000000000000d R14: 0000000000000000 R15: 0000000000000000 ? general_protection+0x8/0x40 ? perf_exclude_event+0x67/0x90 ? perf_bp_event+0x98/0xe0 RIP: 0000:0x2 Code: Bad RIP value. RSP: 0000:0000000005080021 EFLAGS: 00000000 ? ex_handler_uaccess+0x5d/0x70 ? fixup_exception+0x50/0x6a ? do_general_protection+0x40/0x160 ? general_protection+0x2d/0x40 ? stack_trace_consume_entry+0x4b/0x80 ? arch_stack_walk_user+0x71/0x100 ? arch_stack_walk_user+0x34/0x100 ? profile_setup.cold+0xc1/0xc1 ? stack_trace_save_user+0x71/0x9c ? __this_cpu_preempt_check+0xc/0xc6 ? hw_breakpoint_exceptions_notify+0x120/0x1c0 ? notifier_call_chain+0x8e/0xb0 ? atomic_notifier_call_chain+0x37/0x40 ? notify_die+0x5c/0x80 ? trace_hardirqs_off_caller+0x20/0x150 ? trace_hardirqs_off_thunk+0x1a/0x1c ? debug_smp_processor_id+0x28/0xd0 ? paranoid_exit+0xb/0xb0 ? copy_user_enhanced_fast_string+0xe/0x20 Kernel Offset: disabled ---[ end Kernel panic - not syncing: Machine halted. ]--- There's quite a bit to unpack there... I haven't looked into it AT ALL yet, but at least you have the report. Will try to see if I can get a reproducible test case. Vegard