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=-5.4 required=3.0 tests=FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,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 B2708C43331 for ; Tue, 12 Nov 2019 12:14:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 755F8206A3 for ; Tue, 12 Nov 2019 12:14:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725865AbfKLMOI (ORCPT ); Tue, 12 Nov 2019 07:14:08 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:37987 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725954AbfKLMOI (ORCPT ); Tue, 12 Nov 2019 07:14:08 -0500 Received: by mail-il1-f200.google.com with SMTP id f6so19775542ilg.5 for ; Tue, 12 Nov 2019 04:14:07 -0800 (PST) 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:message-id:subject:from:to; bh=sLQVy0wHNgrrvXHOJoKgmqY97Gox0lEP0K7KxqsGea0=; b=OXYHV0rXQWV+QNiZXNsWIWTjEsCRfdQ5liS7MU7Ef6CSUsMhA7NVgV2r50pJJK6JNj Z96lKR2Re4+AEn6J2irIAvCAo96zawzgmK3YjgeUA8cLDJo7BFaB/fwW9Nr6P/sKQ/KE HWPEmEpswCISi5oOvK5qWx9pJd5s7VPYsM561J7Ff+8NRiSxHRxFpgiN4Q/Sh2jqXUvp hVUFwrqvKaFcUusGy/9TgwYjHsO+Dz6u3DSooLCHYoQj8VrexPZ4D01gGCQ0F5q0r/dy krPfOCkjvDEs4jdMquC5pZv5uK2hukyDcT5xs36Ln+M2BEeuR+fb2e9ak6q+/v3XGdxA cQ8Q== X-Gm-Message-State: APjAAAWLY+eoGhzg6epmo/MvOkTzFqm9zoWaZF4jU8i0krWuK8krg9F5 Dc77xKXcjzomSAnYp9f7aOV/7BcKt+2lgE+CcvBajhSMu1ey X-Google-Smtp-Source: APXvYqzUVPQwEZuSHWrKZitQChADIZ95Q4zEdiIUrjKvsymskCsNRquCzM8X17yJiG7NsoQfUhuJLDYuP+IQ0CJkT+W5XkpnXNd6 MIME-Version: 1.0 X-Received: by 2002:a92:104a:: with SMTP id y71mr34841674ill.220.1573560846930; Tue, 12 Nov 2019 04:14:06 -0800 (PST) Date: Tue, 12 Nov 2019 04:14:06 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005062e00597252f5e@google.com> Subject: KMSAN: uninit-value in __flow_hash_from_keys (2) From: syzbot To: ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, glider@google.com, jianbol@mellanox.com, jiri@mellanox.com, kafai@fb.com, linux-kernel@vger.kernel.org, mkubecek@suse.cz, netdev@vger.kernel.org, ogerlitz@mellanox.com, pabeni@redhat.com, ppenkov@google.com, sdf@google.com, simon.horman@netronome.com, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com, zhongjiang@huawei.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 088c01ea kmsan: fix comment, NFC git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=1556e137200000 kernel config: https://syzkaller.appspot.com/x/.config?x=68044283f8b8640d dashboard link: https://syzkaller.appspot.com/bug?extid=3bfc4436d26db9a5ca18 compiler: clang version 8.0.0 (trunk 350509) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+3bfc4436d26db9a5ca18@syzkaller.appspotmail.com ================================================================== BUG: KMSAN: uninit-value in __flow_hash_consistentify net/core/flow_dissector.c:1318 [inline] BUG: KMSAN: uninit-value in __flow_hash_from_keys+0x544/0x1070 net/core/flow_dissector.c:1347 CPU: 0 PID: 14493 Comm: syz-executor.2 Not tainted 5.1.0-rc2+ #21 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+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x131/0x2a0 mm/kmsan/kmsan.c:624 __msan_warning+0x7a/0xf0 mm/kmsan/kmsan_instr.c:310 __flow_hash_consistentify net/core/flow_dissector.c:1318 [inline] __flow_hash_from_keys+0x544/0x1070 net/core/flow_dissector.c:1347 ___skb_get_hash net/core/flow_dissector.c:1370 [inline] __skb_get_hash+0x16d/0x3e0 net/core/flow_dissector.c:1433 skb_get_hash include/linux/skbuff.h:1326 [inline] ip_tunnel_xmit+0x99c/0x3310 net/ipv4/ip_tunnel.c:750 __gre_xmit net/ipv4/ip_gre.c:444 [inline] gre_tap_xmit+0xaa5/0xbb0 net/ipv4/ip_gre.c:707 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 sch_direct_xmit+0x58a/0x880 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x1cd7/0x34b0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3473 [inline] __dev_queue_xmit+0x1e51/0x3ce0 net/core/dev.c:3832 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56 NF_HOOK include/linux/netfilter.h:289 [inline] br_forward_finish net/bridge/br_forward.c:69 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] __br_forward+0xa58/0xe10 net/bridge/br_forward.c:113 deliver_clone net/bridge/br_forward.c:129 [inline] maybe_deliver net/bridge/br_forward.c:184 [inline] br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226 br_dev_xmit+0x1610/0x16a0 net/bridge/br_device.c:99 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 neigh_resolve_output+0xab7/0xb40 net/core/neighbour.c:1487 neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229 ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x53f/0x610 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x8a7/0xde0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x2f46/0x3310 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:444 [inline] ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 packet_snd net/packet/af_packet.c:2931 [inline] packet_sendmsg+0x80f5/0x8ff0 net/packet/af_packet.c:2956 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg net/socket.c:632 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2137 __sys_sendmsg net/socket.c:2175 [inline] __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2182 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2182 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 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:00007febe94fac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007febe94fb6d4 R13: 00000000004c581a R14: 00000000004d9ad8 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 __skb_flow_dissect+0x3303/0x7570 net/core/flow_dissector.c:856 skb_flow_dissect_flow_keys include/linux/skbuff.h:1303 [inline] ___skb_get_hash net/core/flow_dissector.c:1367 [inline] __skb_get_hash+0x142/0x3e0 net/core/flow_dissector.c:1433 skb_get_hash include/linux/skbuff.h:1326 [inline] ip_tunnel_xmit+0x99c/0x3310 net/ipv4/ip_tunnel.c:750 __gre_xmit net/ipv4/ip_gre.c:444 [inline] gre_tap_xmit+0xaa5/0xbb0 net/ipv4/ip_gre.c:707 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 sch_direct_xmit+0x58a/0x880 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x1cd7/0x34b0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3473 [inline] __dev_queue_xmit+0x1e51/0x3ce0 net/core/dev.c:3832 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56 NF_HOOK include/linux/netfilter.h:289 [inline] br_forward_finish net/bridge/br_forward.c:69 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] __br_forward+0xa58/0xe10 net/bridge/br_forward.c:113 deliver_clone net/bridge/br_forward.c:129 [inline] maybe_deliver net/bridge/br_forward.c:184 [inline] br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226 br_dev_xmit+0x1610/0x16a0 net/bridge/br_device.c:99 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 neigh_resolve_output+0xab7/0xb40 net/core/neighbour.c:1487 neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229 ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x53f/0x610 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x8a7/0xde0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x2f46/0x3310 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:444 [inline] ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 packet_snd net/packet/af_packet.c:2931 [inline] packet_sendmsg+0x80f5/0x8ff0 net/packet/af_packet.c:2956 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg net/socket.c:632 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2137 __sys_sendmsg net/socket.c:2175 [inline] __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2182 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2182 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478 __skb_cow include/linux/skbuff.h:3029 [inline] skb_cow_head include/linux/skbuff.h:3063 [inline] gre_tap_xmit+0x7dd/0xbb0 net/ipv4/ip_gre.c:704 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 sch_direct_xmit+0x58a/0x880 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x1cd7/0x34b0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:121 [inline] __dev_xmit_skb net/core/dev.c:3473 [inline] __dev_queue_xmit+0x1e51/0x3ce0 net/core/dev.c:3832 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 br_dev_queue_push_xmit+0x803/0x8b0 net/bridge/br_forward.c:56 NF_HOOK include/linux/netfilter.h:289 [inline] br_forward_finish net/bridge/br_forward.c:69 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] __br_forward+0xa58/0xe10 net/bridge/br_forward.c:113 deliver_clone net/bridge/br_forward.c:129 [inline] maybe_deliver net/bridge/br_forward.c:184 [inline] br_flood+0xc65/0x10b0 net/bridge/br_forward.c:226 br_dev_xmit+0x1610/0x16a0 net/bridge/br_device.c:99 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 neigh_resolve_output+0xab7/0xb40 net/core/neighbour.c:1487 neigh_output include/net/neighbour.h:508 [inline] ip_finish_output2+0x1709/0x1930 net/ipv4/ip_output.c:229 ip_finish_output+0xd2b/0xfd0 net/ipv4/ip_output.c:317 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip_output+0x53f/0x610 net/ipv4/ip_output.c:405 dst_output include/net/dst.h:444 [inline] ip_local_out+0x164/0x1d0 net/ipv4/ip_output.c:124 iptunnel_xmit+0x8a7/0xde0 net/ipv4/ip_tunnel_core.c:91 ip_tunnel_xmit+0x2f46/0x3310 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:444 [inline] ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 packet_snd net/packet/af_packet.c:2931 [inline] packet_sendmsg+0x80f5/0x8ff0 net/packet/af_packet.c:2956 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg net/socket.c:632 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2137 __sys_sendmsg net/socket.c:2175 [inline] __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2182 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2182 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xb5b/0xfe0 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 pskb_expand_head+0x3aa/0x1a30 net/core/skbuff.c:1478 __skb_cow include/linux/skbuff.h:3029 [inline] skb_cow_head include/linux/skbuff.h:3063 [inline] ip_tunnel_xmit+0x2c4e/0x3310 net/ipv4/ip_tunnel.c:824 __gre_xmit net/ipv4/ip_gre.c:444 [inline] ipgre_xmit+0x1098/0x11c0 net/ipv4/ip_gre.c:628 __netdev_start_xmit include/linux/netdevice.h:4411 [inline] netdev_start_xmit include/linux/netdevice.h:4420 [inline] xmit_one net/core/dev.c:3278 [inline] dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294 __dev_queue_xmit+0x2e9f/0x3ce0 net/core/dev.c:3864 dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897 packet_snd net/packet/af_packet.c:2931 [inline] packet_sendmsg+0x80f5/0x8ff0 net/packet/af_packet.c:2956 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg net/socket.c:632 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2137 __sys_sendmsg net/socket.c:2175 [inline] __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2182 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2182 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa9/0x130 mm/kmsan/kmsan_hooks.c:173 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:182 slab_post_alloc_hook mm/slab.h:441 [inline] slab_alloc_node mm/slub.c:2771 [inline] __kmalloc_node_track_caller+0xead/0x1000 mm/slub.c:4396 __kmalloc_reserve net/core/skbuff.c:140 [inline] __alloc_skb+0x309/0xa20 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1059 [inline] alloc_skb_with_frags+0x186/0xa60 net/core/skbuff.c:5287 sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2220 packet_alloc_skb net/packet/af_packet.c:2781 [inline] packet_snd net/packet/af_packet.c:2874 [inline] packet_sendmsg+0x6349/0x8ff0 net/packet/af_packet.c:2956 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg net/socket.c:632 [inline] ___sys_sendmsg+0xdb3/0x1220 net/socket.c:2137 __sys_sendmsg net/socket.c:2175 [inline] __do_sys_sendmsg net/socket.c:2184 [inline] __se_sys_sendmsg+0x305/0x460 net/socket.c:2182 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2182 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ================================================================== --- This bug 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 bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.