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=-18.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS, USER_IN_DEF_DKIM_WL 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 E5A78C433F5 for ; Fri, 10 Sep 2021 07:34:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 624AF611C7 for ; Fri, 10 Sep 2021 07:34:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 624AF611C7 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 80BA26B0071; Fri, 10 Sep 2021 03:34:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7BBE1900002; Fri, 10 Sep 2021 03:34:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 683806B0073; Fri, 10 Sep 2021 03:34:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0205.hostedemail.com [216.40.44.205]) by kanga.kvack.org (Postfix) with ESMTP id 59D326B0071 for ; Fri, 10 Sep 2021 03:34:38 -0400 (EDT) Received: from smtpin40.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 16F941808E9B1 for ; Fri, 10 Sep 2021 07:34:38 +0000 (UTC) X-FDA: 78570851436.40.2949D87 Received: from mail-oi1-f173.google.com (mail-oi1-f173.google.com [209.85.167.173]) by imf24.hostedemail.com (Postfix) with ESMTP id C68FFB00009F for ; Fri, 10 Sep 2021 07:34:37 +0000 (UTC) Received: by mail-oi1-f173.google.com with SMTP id c79so1760365oib.11 for ; Fri, 10 Sep 2021 00:34:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=7VzJcLlZdw5d6SucUkv011Tx3+9MpvlSVesKT1t7kQ4=; b=oXHQEES47599+dxzC1c92J+yT4uoaA1tdQRN1MMhhkn8jTyjK26S2JpEdWX5fjKGUI brlVPN+1tA27w7ex7eQ1wL17ChlgJiHEQ4cAI+ZRDmW7uDtlOQGDm3pgVf/PwWuUq7F7 GqWayfuILRvR/HQAQpC0fIaedCBJyouNHIqH71rYVxSeonZyDVOAECb9/XvAuquVtAiZ fv7Snm4Dk6BfRJlBs/7IsQFgwaYilaHds3ELd0U7bUILBkU/iP9hs0JGmhbyYm+g06kl g99Zv4dISW6n7M7IvSJT5wzq8oPNZvG54+2IDuM6pBYDWUX+3B1B34Srpqj1XHv2l/+M 8Ouw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=7VzJcLlZdw5d6SucUkv011Tx3+9MpvlSVesKT1t7kQ4=; b=XUUmAZ9qmhEJf+eT3UYy+GdHiVtmMLvE/tvYVnBor1zMqenJ1NEzrbqHyVzCkTe29e flzfagvF943R0dqVxw5miTVgJ+vwaOEV2CFoFz4fW7IdDwTUs9MEJyx6ZjrgtY5zbsb9 Mllt+lI4x71PQJwoaffB+zMcEQMXl05U6EhjGix2exileg4aXenVB+bVxX5iFiML5sz9 dWuxCoNavkiJh9M6HuLRGeR7fPg+8pn/K9nhEcbOHt1I2b/fhec3oGEZlHRTH5A6GCcn duDA5ypcbgs7xKVHUROMab+g1JH/wKYtBqWKl9oRcDN3/xkL9jWpl99GeaRCzXnwKXDT /LGw== X-Gm-Message-State: AOAM532/LOHTSAYDGj8+983WEYzLqG0ZxEVthjdg0pF1bOKQB6UuaGAH 6Op8Hf9S8OSNvZGYj+bwXPuUWRDZTahPlht3o5Ipig== X-Google-Smtp-Source: ABdhPJwvwrFwO7TK/1gB2mC/2/PETyll3eCPRRFR6DT2soG/F8UgkbTVjc+XR3PN4ejP5TTMQlQAvP92eOyfMNI3G04= X-Received: by 2002:aca:4344:: with SMTP id q65mr3175015oia.70.1631259276843; Fri, 10 Sep 2021 00:34:36 -0700 (PDT) MIME-Version: 1.0 References: <00000000000071b5b105cb994728@google.com> In-Reply-To: <00000000000071b5b105cb994728@google.com> From: Marco Elver Date: Fri, 10 Sep 2021 09:34:25 +0200 Message-ID: Subject: Re: [syzbot] kernel panic: panic_on_warn set (3) To: syzbot Cc: akpm@linux-foundation.org, dvyukov@google.com, glider@google.com, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, Aleksandr Nogikh Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C68FFB00009F Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=oXHQEES4; dmarc=pass (policy=reject) header.from=google.com; spf=pass (imf24.hostedemail.com: domain of elver@google.com designates 209.85.167.173 as permitted sender) smtp.mailfrom=elver@google.com X-Stat-Signature: ud4geanpiganmw8up75r1cnrdmiitb89 X-HE-Tag: 1631259277-476328 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: #syz invalid Corrupt report. (syzbot somehow failed to parse the report?) Same use-after-free bug as this: https://lore.kernel.org/all/000000000000d6b66705cb2fffd4@google.com/T/#u which still seems unfixed... On Fri, 10 Sept 2021 at 02:34, syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: ac08b1c68d1b Merge tag 'pci-v5.15-changes' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16144a63300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=16e23f04679ec35e > dashboard link: https://syzkaller.appspot.com/bug?extid=8d41ad9c88279d71f7c9 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > userspace arch: i386 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136aedb5300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+8d41ad9c88279d71f7c9@syzkaller.appspotmail.com > > handle drivers/base/devtmpfs.c:382 [inline] > devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] > devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > ================================================================== > Kernel panic - not syncing: panic_on_warn set ... > CPU: 0 PID: 22 Comm: kdevtmpfs Not tainted 5.14.0-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 > panic+0x2b0/0x6dd kernel/panic.c:232 > kfence_report_error.cold+0x304/0xa56 mm/kfence/report.c:264 > kfence_handle_page_fault+0x203/0x630 mm/kfence/core.c:880 > page_fault_oops+0x1c5/0x6b0 arch/x86/mm/fault.c:686 > kernelmode_fixup_or_oops+0x219/0x280 arch/x86/mm/fault.c:755 > __bad_area_nosemaphore+0x36d/0x400 arch/x86/mm/fault.c:801 > do_kern_addr_fault+0x5b/0x70 arch/x86/mm/fault.c:1200 > handle_page_fault arch/x86/mm/fault.c:1473 [inline] > exc_page_fault+0x155/0x180 arch/x86/mm/fault.c:1531 > asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568 > RIP: 0010:kvm_fastop_exception+0xf6a/0x1058 > Code: d3 ed e9 ef d4 6e f8 49 8d 0e 48 83 e1 f8 4c 8b 21 41 8d 0e 83 e1 07 c1 e1 03 49 d3 ec e9 45 e2 6e f8 49 8d 4d 00 48 83 e1 f8 <4c> 8b 21 41 8d 4d 00 83 e1 07 c1 e1 03 49 d3 ec e9 35 ec 6e f8 bd > RSP: 0018:ffffc90000dcfae8 EFLAGS: 00010282 > RAX: 0000003361736376 RBX: ffff88806f1e3068 RCX: ffff88823bd14020 > RDX: ffffed100de3c614 RSI: 0000000000000005 RDI: 0000000000000007 > RBP: 0000000000000005 R08: 0000000000000000 R09: ffff88806f1e3098 > R10: ffffed100de3c613 R11: 0000000000000000 R12: ffff88823bd14020 > R13: ffff88823bd14020 R14: ffff88806f1e3098 R15: dffffc0000000000 > d_lookup+0xd8/0x170 fs/dcache.c:2370 > lookup_dcache+0x1e/0x130 fs/namei.c:1520 > __lookup_hash+0x29/0x180 fs/namei.c:1543 > kern_path_locked+0x17e/0x320 fs/namei.c:2567 > handle_remove+0xa2/0x5fe drivers/base/devtmpfs.c:312 > handle drivers/base/devtmpfs.c:382 [inline] > devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline] > devtmpfsd+0x1b9/0x2a3 drivers/base/devtmpfs.c:437 > kthread+0x3e5/0x4d0 kernel/kthread.c:319 > ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 > Kernel Offset: disabled > ---------------- > Code disassembly (best guess): > 0: d3 ed shr %cl,%ebp > 2: e9 ef d4 6e f8 jmpq 0xf86ed4f6 > 7: 49 8d 0e lea (%r14),%rcx > a: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx > e: 4c 8b 21 mov (%rcx),%r12 > 11: 41 8d 0e lea (%r14),%ecx > 14: 83 e1 07 and $0x7,%ecx > 17: c1 e1 03 shl $0x3,%ecx > 1a: 49 d3 ec shr %cl,%r12 > 1d: e9 45 e2 6e f8 jmpq 0xf86ee267 > 22: 49 8d 4d 00 lea 0x0(%r13),%rcx > 26: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx > * 2a: 4c 8b 21 mov (%rcx),%r12 <-- trapping instruction > 2d: 41 8d 4d 00 lea 0x0(%r13),%ecx > 31: 83 e1 07 and $0x7,%ecx > 34: c1 e1 03 shl $0x3,%ecx > 37: 49 d3 ec shr %cl,%r12 > 3a: e9 35 ec 6e f8 jmpq 0xf86eec74 > 3f: bd .byte 0xbd > > > --- > 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. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches