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=-4.0 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=no 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 C9670C433E7 for ; Tue, 1 Sep 2020 02:58:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B067C2073A for ; Tue, 1 Sep 2020 02:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726301AbgIAC6S (ORCPT ); Mon, 31 Aug 2020 22:58:18 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:48032 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726020AbgIAC6Q (ORCPT ); Mon, 31 Aug 2020 22:58:16 -0400 Received: by mail-il1-f200.google.com with SMTP id z6so1523355iln.14 for ; Mon, 31 Aug 2020 19:58:16 -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=WexOQnXbthcYvRcB6BIN9debPbV2YkV5F6SBTRFrGAo=; b=DxqJt87NfGHB9X23Js2jTH0xGDaTmd3/1mXaBQfoHsroBvEdYa916cQMqHZU2KAP7c yjcmAnnHZgiJNF0B1e1eNedPFv3zVQSR7O/3SiOghLy9KKB4u8vKlCBw/N7wLZqn3ejg Pp0redC0ovaD7BK/m/OB0hI0D8Nbab6bVSZgh7rv9TGanlpPEc6FPIuEr6XZhjnjSOIO KJYYvc8XBGak6E720pWlkHw8nkSm0glSDfrwpLpN9qYo0BBeRRJCevqYeOXxfHYgIM5I VXAyRHG2NDlxrJQk2+Hc3pizrtnrRctdv66WG6n8wkJB9cP93vMm1Rp5KuVL/WPfLxG6 RkBg== X-Gm-Message-State: AOAM5312zOGJKAZrVNknIh09PFq9zWkvWLyDUQnTx/dcTAX4vgLxbO+1 I5BS7uMAlcAezmzdd8g5eGaxobnMEKXMQVMpAdhHRJuBgGB6 X-Google-Smtp-Source: ABdhPJw3yQOMAzLshUBx3mglJ5xdVhoAQxwgjD3PIGjPgyXTMFAnfsS6746SXh0Ih6aaYeSsqHDbug1pulTtspuBEIGa0+LBf3bB MIME-Version: 1.0 X-Received: by 2002:a92:6a09:: with SMTP id f9mr4024575ilc.273.1598929095740; Mon, 31 Aug 2020 19:58:15 -0700 (PDT) Date: Mon, 31 Aug 2020 19:58:15 -0700 In-Reply-To: <000000000000500e6f05a34ecc01@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c5d18605ae37b04c@google.com> Subject: Re: WARNING in bpf_cgroup_link_release From: syzbot To: andrii.nakryiko@gmail.com, andriin@fb.com, ast@kernel.org, bpf@vger.kernel.org, dan.carpenter@oracle.com, daniel@iogearbox.net, john.fastabend@gmail.com, kafai@fb.com, kpsingh@chromium.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: bb8872a1 tipc: fix using smp_processor_id() in preemptible git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=10aa0271900000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0437fdd630bee11 dashboard link: https://syzkaller.appspot.com/bug?extid=8a5dadc5c0b1d7055945 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1291cbde900000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12896476900000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8a5dadc5c0b1d7055945@syzkaller.appspotmail.com RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffeea853240 R14: 0000000000000000 R15: 0000000000000000 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6859 at kernel/bpf/cgroup.c:833 bpf_cgroup_link_release.part.0+0x28b/0x380 kernel/bpf/cgroup.c:833 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 6859 Comm: syz-executor054 Not tainted 5.9.0-rc1-syzkaller #0 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+0x18f/0x20d lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:231 __warn.cold+0x20/0x4a kernel/panic.c:600 report_bug+0x1bd/0x210 lib/bug.c:198 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536 RIP: 0010:bpf_cgroup_link_release.part.0+0x28b/0x380 kernel/bpf/cgroup.c:833 Code: 01 e8 ce e0 cd ff e9 f1 fe ff ff e8 3f 60 e7 ff 48 c7 c7 00 d4 bf 89 e8 83 ad 68 06 5b 5d 41 5c e9 2a 60 e7 ff e8 25 60 e7 ff <0f> 0b e9 01 fe ff ff e8 19 60 e7 ff e8 e4 2a d4 ff 31 ff 89 c3 89 RSP: 0018:ffffc90005367d38 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888094525700 RCX: ffffffff818cdceb RDX: ffff8880978ec240 RSI: ffffffff818cdeeb RDI: 0000000000000005 RBP: 00000000fffffff4 R08: 0000000000000001 R09: ffffffff89c97453 R10: 0000000000000000 R11: 0000000035383654 R12: ffff888094525768 R13: ffffffffffffffa1 R14: 0000000000000022 R15: 0000000000000008 bpf_cgroup_link_release kernel/bpf/cgroup.c:822 [inline] bpf_cgroup_link_detach+0x38/0x50 kernel/bpf/cgroup.c:854 link_detach kernel/bpf/syscall.c:4009 [inline] __do_sys_bpf+0x667/0x4c20 kernel/bpf/syscall.c:4267 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x442229 Code: e8 1c b4 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffeea8531e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442229 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000022 RBP: ffffffffffffffff R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009 R13: 00007ffeea853240 R14: 0000000000000000 R15: 0000000000000000 Kernel Offset: disabled Rebooting in 86400 seconds..