Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756412AbdLPAhs (ORCPT ); Fri, 15 Dec 2017 19:37:48 -0500 Received: from mail-ua0-f182.google.com ([209.85.217.182]:42055 "EHLO mail-ua0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755824AbdLPAhq (ORCPT ); Fri, 15 Dec 2017 19:37:46 -0500 X-Google-Smtp-Source: ACJfBosfNMy4X56tyyUpQJyKarGhq45zJY8CmlC0LtfTq4QuiwOyk+03g5TMt3mlXTOdyQhS/ZI7Q4JEkqoLSkdoyOk= MIME-Version: 1.0 From: Andrei Vagin Date: Fri, 15 Dec 2017 16:37:44 -0800 Message-ID: Subject: BUG: unable to handle kernel NULL pointer dereference in fdb_find_rcu To: Linux Kernel Network Developers , Nikolay Aleksandrov , LKML Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3866 Lines: 75 Hi, We run criu tests for linux-next and today we get this bug: The kernel version is 4.15.0-rc3-next-20171215 [ 235.397328] BUG: unable to handle kernel NULL pointer dereference at 000000000000000c [ 235.398624] IP: fdb_find_rcu+0x3c/0x130 [ 235.399365] PGD 51970067 P4D 51970067 PUD 51971067 PMD 0 [ 235.400400] Oops: 0000 [#1] SMP [ 235.400959] Modules linked in: [ 235.401455] CPU: 1 PID: 32057 Comm: criu Not tainted 4.15.0-rc3-next-20171215-00002-g2e56147d7dc8 #10 [ 235.402935] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1.fc26 04/01/2014 [ 235.404356] RIP: 0010:fdb_find_rcu+0x3c/0x130 [ 235.405069] RSP: 0018:ffffbc64c05f76e8 EFLAGS: 00010246 [ 235.405908] RAX: 000000000000e871 RBX: 0000000000000000 RCX: 0000000000000000 [ 235.407062] RDX: 0000000000000000 RSI: ffff9d9b69a04798 RDI: ffff9d9b64c14948 [ 235.408370] RBP: ffff9d9b64c14948 R08: ffffbc64c05f7c18 R09: ffff9d9b64c140a0 [ 235.409518] R10: 0000000064c140a0 R11: ffff9d9b75743968 R12: ffff9d9b757ce260 [ 235.410674] R13: 0000000000000000 R14: ffffbc64c05f7c18 R15: ffffffffa5384560 [ 235.411837] FS: 00007ffac2660100(0000) GS:ffff9d9b7fd00000(0000) knlGS:0000000000000000 [ 235.412920] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 235.413764] CR2: 000000000000000c CR3: 000000006a7ff004 CR4: 00000000003606e0 [ 235.414829] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 235.416096] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 235.417365] Call Trace: [ 235.417774] br_fdb_change_mac_address+0x31/0x80 [ 235.418538] br_stp_change_bridge_id+0x25/0x110 [ 235.419280] br_dev_newlink+0x43/0xa0 [ 235.419796] rtnl_newlink+0x70f/0x940 [ 235.420391] ? nla_parse+0x83/0xf0 [ 235.420948] ? nla_strlcpy+0x48/0x50 [ 235.421540] ? rtnl_link_ops_get+0x34/0x50 [ 235.422211] ? rtnl_newlink+0x193/0x940 [ 235.422843] ? deactivate_slab.isra.78+0x11b/0x3b0 [ 235.423599] rtnetlink_rcv_msg+0x25d/0x2d0 [ 235.424189] ? __alloc_skb+0x82/0x1e0 [ 235.424718] ? __slab_alloc+0x1c/0x30 [ 235.425420] ? rtnl_calcit.isra.27+0x110/0x110 [ 235.426354] netlink_rcv_skb+0x8d/0x130 [ 235.426995] netlink_unicast+0x19d/0x250 [ 235.427754] netlink_sendmsg+0x2a5/0x3a0 [ 235.428387] sock_sendmsg+0x30/0x40 [ 235.428807] ___sys_sendmsg+0x269/0x2c0 [ 235.429277] ? generic_perform_write+0x122/0x1b0 [ 235.429828] ? __generic_file_write_iter+0x192/0x1c0 [ 235.430422] ? ext4_file_write_iter+0x20c/0x3e0 [ 235.430975] ? SyS_setns+0xc2/0xd0 [ 235.431425] ? __vfs_write+0xf9/0x170 [ 235.431886] ? __sys_sendmsg+0x51/0x90 [ 235.432501] __sys_sendmsg+0x51/0x90 [ 235.433098] entry_SYSCALL_64_fastpath+0x1a/0x7d [ 235.433822] RIP: 0033:0x7ffac1e170f7 [ 235.434409] RSP: 002b:00007ffc5610c688 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 235.435635] RAX: ffffffffffffffda RBX: 00000000022eb010 RCX: 00007ffac1e170f7 [ 235.436796] RDX: 0000000000000000 RSI: 00007ffc5610c6c0 RDI: 0000000000000002 [ 235.437956] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 235.439125] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc5610cbac [ 235.440556] R13: 0005005800000011 R14: 00007ffac2666158 R15: 0000000000000001 [ 235.442175] Code: fd 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 8b 06 48 8b 1f 66 89 54 24 06 89 04 24 0f b7 46 04 66 89 44 24 04 <8b> 43 0c 8b 14 24 8d b0 f7 be ad de 8b 44 24 04 01 f2 01 f0 89 [ 235.444717] RIP: fdb_find_rcu+0x3c/0x130 RSP: ffffbc64c05f76e8 [ 235.445636] CR2: 000000000000000c [ 235.446278] ---[ end trace b77358b1e42a9dd7 ]--- [ 235.447170] Kernel panic - not syncing: Fatal exception in interrupt [ 235.448379] Kernel Offset: 0x23000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) [ 235.449750] ---[ end Kernel panic - not syncing: Fatal exception in interrupt