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,URIBL_BLOCKED autolearn=unavailable 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 5C621C43141 for ; Sat, 23 Nov 2019 18:05:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BEB520719 for ; Sat, 23 Nov 2019 18:05:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726910AbfKWSFP (ORCPT ); Sat, 23 Nov 2019 13:05:15 -0500 Received: from mail-il1-f200.google.com ([209.85.166.200]:51572 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726620AbfKWSFM (ORCPT ); Sat, 23 Nov 2019 13:05:12 -0500 Received: by mail-il1-f200.google.com with SMTP id x2so9515548ilk.18 for ; Sat, 23 Nov 2019 10:05:10 -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=m57d6pzMbnRE+E77SNnUVK48CZSyCuqXvxNHBd1sUpg=; b=CnwfAM47rp0wtAzPAoIzrCu33Q7zLUeRjjO5OERfiwGqOZ0lP/vySpSpt96kgn1SsR wcOmq3p9a4yLtRC3Wfisqk+EbUXeDFYmj857r3wNwt9Kohvi4If0cseW/pBdRASj6nEC e5jTZdehe0Sn6trY2mmwkl5A3wuEZ4BXMCmH7fGjY39ZNAXzJCzwXrE61ov9Tj9bDtTw t2fd9QR3crsX+1NL3O6dFZ0Jy5YQ8NGG4+R8Mx6YNoptjQqCGt7PgaZDVwVIRtiII1oe ZKFZA0QZRshFaOb9M67jZjLdWoZOUp4JaMYEz7X/uoh+T6BfEgSXnumPewKvhpt/hR5a YIzQ== X-Gm-Message-State: APjAAAX8hRO3oWxMe0qila0xEIRv1bHVDKOcmzzBsLlTQF01Ch5Dc6V/ TxQPepXBjpmU72Ze1eq2cbmA35hNcI02wlVxVDFO4JCIIIms X-Google-Smtp-Source: APXvYqxw5FikGezlDJ6iFZJN/0R9hWPQ1CdQy5EbMecOvSWZ2tWu+7jJQttnrNArYfRZjONWb1MUuwLB2urjqtQkb/TTFKEAufph MIME-Version: 1.0 X-Received: by 2002:a92:5c5d:: with SMTP id q90mr24932010ilb.22.1574532310177; Sat, 23 Nov 2019 10:05:10 -0800 (PST) Date: Sat, 23 Nov 2019 10:05:10 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000924780598075f4b@google.com> Subject: KMSAN: uninit-value in __skb_checksum_complete (4) From: syzbot To: coreteam@netfilter.org, davem@davemloft.net, fw@strlen.de, glider@google.com, kadlec@netfilter.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org, pablo@netfilter.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: netfilter-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netfilter-devel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 287021d5 Revert "lib/scatterlist: kmsan: don't squash cont.. git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=152c638ce00000 kernel config: https://syzkaller.appspot.com/x/.config?x=9e324dfe9c7b0360 dashboard link: https://syzkaller.appspot.com/bug?extid=721b564cd88ebb710182 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1423f122e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+721b564cd88ebb710182@syzkaller.appspotmail.com ===================================================== BUG: KMSAN: uninit-value in __skb_checksum_complete+0x37b/0x530 net/core/skbuff.c:2851 CPU: 0 PID: 12256 Comm: udevd Not tainted 5.4.0-rc5-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+0x191/0x1f0 lib/dump_stack.c:113 kmsan_report+0x128/0x220 mm/kmsan/kmsan_report.c:108 __msan_warning+0x73/0xe0 mm/kmsan/kmsan_instr.c:245 __skb_checksum_complete+0x37b/0x530 net/core/skbuff.c:2851 nf_ip_checksum+0x567/0x770 net/netfilter/utils.c:36 nf_nat_icmp_reply_translation+0x2ba/0x970 net/netfilter/nf_nat_proto.c:567 nf_nat_ipv4_fn net/netfilter/nf_nat_proto.c:626 [inline] nf_nat_ipv4_local_fn+0x215/0x840 net/netfilter/nf_nat_proto.c:697 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0x18b/0x3f0 net/netfilter/core.c:512 nf_hook include/linux/netfilter.h:260 [inline] __ip_local_out+0x69b/0x800 net/ipv4/ip_output.c:114 ip_local_out net/ipv4/ip_output.c:123 [inline] ip_send_skb net/ipv4/ip_output.c:1558 [inline] ip_push_pending_frames+0x16f/0x460 net/ipv4/ip_output.c:1578 icmp_push_reply+0x692/0x750 net/ipv4/icmp.c:389 __icmp_send+0x2313/0x3080 net/ipv4/icmp.c:738 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline] ipv4_link_failure+0x73c/0xaf0 net/ipv4/route.c:1227 dst_link_failure include/net/dst.h:419 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:996 neigh_timer_handler+0xda4/0x1450 net/core/neighbour.c:1082 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 RIP: 0010:kmsan_slab_alloc+0xd5/0x120 mm/kmsan/kmsan_hooks.c:92 Code: 0a ba 01 00 00 00 e8 6a e7 ff ff 65 ff 0d 17 05 fd 7d 65 8b 05 10 05 fd 7d 85 c0 75 30 e8 73 6e 37 ff 4c 89 65 c8 ff 75 c8 9d <65> 48 8b 04 25 28 00 00 00 48 3b 45 d8 75 0d 48 83 c4 18 5b 41 5c RSP: 0018:ffff888104a5fb48 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff888069bbb000 RCX: 0000000000000401 RDX: 0000000000000400 RSI: 0000000000000000 RDI: ffff888069bbb000 RBP: ffff888104a5fb80 R08: 0000000000000002 R09: ffff888077c93000 R10: 0000000000000004 R11: ffffffff82579470 R12: 0000000000000246 R13: ffff88812f8068c0 R14: 0000000000000dc0 R15: ffff88812f8068c0 slab_alloc_node mm/slub.c:2799 [inline] slab_alloc mm/slub.c:2808 [inline] kmem_cache_alloc_trace+0x8b6/0xd10 mm/slub.c:2825 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] kernfs_iop_get_link+0xcb/0xc40 fs/kernfs/symlink.c:135 vfs_readlink+0x20d/0x6e0 fs/namei.c:4728 do_readlinkat+0x406/0x520 fs/stat.c:411 __do_sys_readlink fs/stat.c:432 [inline] __se_sys_readlink+0x99/0xc0 fs/stat.c:429 __x64_sys_readlink+0x4a/0x70 fs/stat.c:429 do_syscall_64+0xb6/0x160 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x7faf01efa577 Code: f0 ff ff 77 02 f3 c3 48 8b 15 bd 38 2b 00 f7 d8 64 89 02 83 c8 ff c3 90 90 90 90 90 90 90 90 90 90 90 90 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 91 38 2b 00 31 d2 48 29 c2 64 RSP: 002b:00007ffee58d72b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffee58d7af0 RCX: 00007faf01efa577 RDX: 0000000000000400 RSI: 00007ffee58d76c0 RDI: 00007ffee58d72c0 RBP: 0000000000000200 R08: 000000000042033b R09: 00007faf01f4ec20 R10: 7269762f73656369 R11: 0000000000000206 R12: 00000000017c4e10 R13: 0000000000625500 R14: 00000000017bf250 R15: 000000000000000b Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 csum_partial_copy+0xae/0x100 lib/checksum.c:174 skb_copy_and_csum_bits+0x214/0x10b0 net/core/skbuff.c:2738 icmp_glue_bits+0x16b/0x380 net/ipv4/icmp.c:352 __ip_append_data+0x41c3/0x52c0 net/ipv4/ip_output.c:1132 ip_append_data+0x324/0x480 net/ipv4/ip_output.c:1313 icmp_push_reply+0x210/0x750 net/ipv4/icmp.c:370 __icmp_send+0x2313/0x3080 net/ipv4/icmp.c:738 ipv4_send_dest_unreach net/ipv4/route.c:1220 [inline] ipv4_link_failure+0x73c/0xaf0 net/ipv4/route.c:1227 dst_link_failure include/net/dst.h:419 [inline] arp_error_report+0x106/0x1a0 net/ipv4/arp.c:293 neigh_invalidate+0x359/0x8e0 net/core/neighbour.c:996 neigh_timer_handler+0xda4/0x1450 net/core/neighbour.c:1082 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] kmsan_slab_alloc+0xd5/0x120 mm/kmsan/kmsan_hooks.c:92 slab_alloc_node mm/slub.c:2799 [inline] slab_alloc mm/slub.c:2808 [inline] kmem_cache_alloc_trace+0x8b6/0xd10 mm/slub.c:2825 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] kernfs_iop_get_link+0xcb/0xc40 fs/kernfs/symlink.c:135 vfs_readlink+0x20d/0x6e0 fs/namei.c:4728 do_readlinkat+0x406/0x520 fs/stat.c:411 __do_sys_readlink fs/stat.c:432 [inline] __se_sys_readlink+0x99/0xc0 fs/stat.c:429 __x64_sys_readlink+0x4a/0x70 fs/stat.c:429 do_syscall_64+0xb6/0x160 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:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 skb_put_data include/linux/skbuff.h:2217 [inline] sctp_packet_pack net/sctp/output.c:470 [inline] sctp_packet_transmit+0x1d9e/0x4250 net/sctp/output.c:597 sctp_outq_flush_transports net/sctp/outqueue.c:1146 [inline] sctp_outq_flush+0x1823/0x5d80 net/sctp/outqueue.c:1194 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:757 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1781 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1184 [inline] sctp_do_sm+0x8fe1/0x9720 net/sctp/sm_sideeffect.c:1155 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] spin_unlock_irq include/linux/spinlock.h:388 [inline] alloc_pid+0xd06/0xd50 kernel/pid.c:229 copy_process+0x446d/0x89f0 kernel/fork.c:2031 _do_fork+0x25c/0xeb0 kernel/fork.c:2368 __do_sys_clone kernel/fork.c:2523 [inline] __se_sys_clone+0x32a/0x370 kernel/fork.c:2504 __x64_sys_clone+0x62/0x80 kernel/fork.c:2504 do_syscall_64+0xb6/0x160 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:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 skb_put_data include/linux/skbuff.h:2217 [inline] sctp_addto_chunk net/sctp/sm_make_chunk.c:1494 [inline] sctp_make_heartbeat+0x612/0x9e0 net/sctp/sm_make_chunk.c:1164 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline] sctp_sf_sendbeat_8_3+0x18d/0xb10 net/sctp/sm_statefuns.c:1034 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] spin_unlock_irq include/linux/spinlock.h:388 [inline] alloc_pid+0xd06/0xd50 kernel/pid.c:229 copy_process+0x446d/0x89f0 kernel/fork.c:2031 _do_fork+0x25c/0xeb0 kernel/fork.c:2368 __do_sys_clone kernel/fork.c:2523 [inline] __se_sys_clone+0x32a/0x370 kernel/fork.c:2504 __x64_sys_clone+0x62/0x80 kernel/fork.c:2504 do_syscall_64+0xb6/0x160 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:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 sctp_make_heartbeat+0x3e9/0x9e0 net/sctp/sm_make_chunk.c:1156 sctp_sf_heartbeat net/sctp/sm_statefuns.c:990 [inline] sctp_sf_sendbeat_8_3+0x18d/0xb10 net/sctp/sm_statefuns.c:1034 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_generate_heartbeat_event+0x3c6/0x5a0 net/sctp/sm_sideeffect.c:391 call_timer_fn+0x232/0x530 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0xd60/0x1270 kernel/time/timer.c:1773 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 invoke_softirq kernel/softirq.c:375 [inline] irq_exit+0x230/0x280 kernel/softirq.c:416 exiting_irq+0xe/0x10 arch/x86/include/asm/apic.h:536 smp_apic_timer_interrupt+0x48/0x70 arch/x86/kernel/apic/apic.c:1139 apic_timer_interrupt+0x2e/0x40 arch/x86/entry/entry_64.S:837 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] spin_unlock_irq include/linux/spinlock.h:388 [inline] alloc_pid+0xd06/0xd50 kernel/pid.c:229 copy_process+0x446d/0x89f0 kernel/fork.c:2031 _do_fork+0x25c/0xeb0 kernel/fork.c:2368 __do_sys_clone kernel/fork.c:2523 [inline] __se_sys_clone+0x32a/0x370 kernel/fork.c:2504 __x64_sys_clone+0x62/0x80 kernel/fork.c:2504 do_syscall_64+0xb6/0x160 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:151 [inline] kmsan_internal_chain_origin+0xbd/0x180 mm/kmsan/kmsan.c:319 kmsan_memcpy_memmove_metadata+0x25c/0x2e0 mm/kmsan/kmsan.c:254 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:274 __msan_memcpy+0x56/0x70 mm/kmsan/kmsan_instr.c:129 sctp_transport_init net/sctp/transport.c:47 [inline] sctp_transport_new+0x248/0xa00 net/sctp/transport.c:100 sctp_assoc_add_peer+0x5ba/0x2030 net/sctp/associola.c:611 sctp_process_param net/sctp/sm_make_chunk.c:2524 [inline] sctp_process_init+0x162b/0x3e30 net/sctp/sm_make_chunk.c:2345 sctp_sf_do_5_1D_ce+0xe0f/0x30d0 net/sctp/sm_statefuns.c:767 sctp_do_sm+0x2b2/0x9720 net/sctp/sm_sideeffect.c:1152 sctp_endpoint_bh_rcv+0xda2/0x1050 net/sctp/endpointola.c:394 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:80 sctp_rcv+0x3a6d/0x54e0 net/sctp/input.c:256 ip_protocol_deliver_rcu+0x70f/0xbd0 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_local_deliver+0x62a/0x7c0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish net/ipv4/ip_input.c:413 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_rcv+0x6c5/0x740 net/ipv4/ip_input.c:523 __netif_receive_skb_one_core net/core/dev.c:5010 [inline] __netif_receive_skb net/core/dev.c:5124 [inline] process_backlog+0xef5/0x1410 net/core/dev.c:5955 napi_poll net/core/dev.c:6392 [inline] net_rx_action+0x7a6/0x1aa0 net/core/dev.c:6460 __do_softirq+0x4a1/0x83a kernel/softirq.c:293 run_ksoftirqd+0x25/0x40 kernel/softirq.c:607 smpboot_thread_fn+0x4a3/0x990 kernel/smpboot.c:165 kthread+0x4b5/0x4f0 kernel/kthread.c:256 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:355 Local variable description: ----addr.i@sctp_process_init Variable was created at: sctp_process_param net/sctp/sm_make_chunk.c:2495 [inline] sctp_process_init+0x603/0x3e30 net/sctp/sm_make_chunk.c:2345 sctp_process_param net/sctp/sm_make_chunk.c:2495 [inline] sctp_process_init+0x603/0x3e30 net/sctp/sm_make_chunk.c:2345 ===================================================== --- 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. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches