From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 00FD621A928 for ; Mon, 31 Mar 2025 20:23:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743452603; cv=none; b=tdOs/fqxvZact/4RIowYzd7+Ud87zvcwQT8PAC7XyI8hZG0XE56uDLHbumgA32MEIhyMALreXBArCLkqhu0p+CAcL3Amkp+efgmmQXQHOLY1lsr3SqINlwyMPh6jSjWvD/BeT1Q19seyY9fwtp/7TNM+l5jb7TDdW+62eeLVXAc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743452603; c=relaxed/simple; bh=3PY05xnMoMY5l0MLOVsaY4dzTB65DW9ZAGjtkWZLVh0=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=cDoRxjYTrqZtT3vSue4GsGlQ8a4IhCp3+QVHZXYGt0vFvaAEK2dBqXFTHfYCoitnoxGe4QLNxxnnhrOaFO6WiJBuUj250qsT7/9joLK7m6jleGXZleHw23+eUK6FMf4d76Wo9BAdcPMx5DKyQk4ZSMkOzEaS+LBYaYhWNtY9kb4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-3d44ba1c2b5so51391015ab.2 for ; Mon, 31 Mar 2025 13:23:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1743452600; x=1744057400; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=3IdS2CIIBxydV1hM12Yq4u+yxRM3vbbwLHZJ/Jv2v1U=; b=ldPcP3PmQeOY+JWlJS48g24wRMbRDbKs61LgIIXt7wOfjGAutj8TEaJGgzjvaTm4n5 ak0Qcs7/DVEtX6bzjSOHY/zgfvl/CDw4rFSkjzcyD+fcQ13XtqoRowS4EUwctSsVC1m8 WIvbxmHFLoE8zWuSkUyEWswANe/d35UP159LjOhFPQS0nTv0og9zbBHCZHont2hucWMh UHzFTH6MPDmvm3SjiRRLrNH7RhjZB2WoXf0up8ZxD3+7nBR7TmYC2q7gJgIh7UsCbXab 8RmC0g01h7tnZAtXUD2rmP7KfIuSIMV8m/LbQgLip3x1uSv3j28aNm/p31rIoOhJRLmG pUTA== X-Forwarded-Encrypted: i=1; AJvYcCWTv0CZoayzEg5KRVFrdlfqrQ8MWXQcng0xCmW2P8QHVyKT2cpqmY0uuPskwMGfkmMKrRPlG6LzKgUw@vger.kernel.org X-Gm-Message-State: AOJu0YyOy8cH92rBgLBHF4iqTAF3DdgAbN+twL+9HHTlvEAFBz5il6z2 BGq1soArcXShTelyxHklDVd5VweMcHCn3eEM3Rt2EryFWWUtr244vqhComqwvoaXT2DJsZqXSe3 ueuiPbswIx1O70j1MzYu3F73/buOKh/mV/KQloMIlW8+vZgpo2YZoZMI= X-Google-Smtp-Source: AGHT+IHLSJS1wU9leOVUk3T6cwy7hiPNlkyZgl8AGQuBu7QPD/fBMTwXXwdHHtraXgZq65fv4E9K737nJXsbQyEFMVQY9/Ey77Hg Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:238a:b0:3d3:fa0a:7242 with SMTP id e9e14a558f8ab-3d5e0912eb8mr90641135ab.9.1743452600121; Mon, 31 Mar 2025 13:23:20 -0700 (PDT) Date: Mon, 31 Mar 2025 13:23:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67eaf9b8.050a0220.3c3d88.004a.GAE@google.com> Subject: [syzbot] [rdma?] [s390?] [net?] KASAN: null-ptr-deref Read in smc_tcp_syn_recv_sock From: syzbot To: agordeev@linux.ibm.com, alibuda@linux.alibaba.com, davem@davemloft.net, edumazet@google.com, guwen@linux.alibaba.com, horms@kernel.org, jaka@linux.ibm.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, pabeni@redhat.com, syzkaller-bugs@googlegroups.com, tonylu@linux.alibaba.com, wenjia@linux.ibm.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 850925a8133c Merge tag '9p-for-6.12-rc5' of https://github.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1227aa87980000 kernel config: https://syzkaller.appspot.com/x/.config?x=17c0d505695d6b0 dashboard link: https://syzkaller.appspot.com/bug?extid=827ae2bfb3a3529333e9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15489230580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/6d8177e17058/disk-850925a8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5d88252f39ff/vmlinux-850925a8.xz kernel image: https://storage.googleapis.com/syzbot-assets/7a675a61b90d/bzImage-850925a8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+827ae2bfb3a3529333e9@syzkaller.appspotmail.com TCP: request_sock_TCP: Possible SYN flooding on port [::]:20002. Sending cookies. TCP: request_sock_TCP: Possible SYN flooding on port [::]:20002. Sending cookies. ================================================================== BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: null-ptr-deref in smc_tcp_syn_recv_sock+0xa7/0x4b0 net/smc/af_smc.c:131 Read of size 4 at addr 00000000000009d4 by task syz.4.10809/28966 CPU: 1 UID: 0 PID: 28966 Comm: syz.4.10809 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 kasan_report+0xd9/0x110 mm/kasan/report.c:601 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0xef/0x1a0 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] smc_tcp_syn_recv_sock+0xa7/0x4b0 net/smc/af_smc.c:131 tcp_get_cookie_sock+0xd5/0x790 net/ipv4/syncookies.c:204 cookie_v4_check+0xcf8/0x1d40 net/ipv4/syncookies.c:485 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1864 [inline] tcp_v4_do_rcv+0x98e/0xa90 net/ipv4/tcp_ipv4.c:1923 tcp_v4_rcv+0x3cd2/0x4390 net/ipv4/tcp_ipv4.c:2340 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5666 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5779 process_backlog+0x443/0x15f0 net/core/dev.c:6111 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:6775 napi_poll net/core/dev.c:6844 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6966 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x887/0x4350 net/core/dev.c:4455 dev_queue_xmit include/linux/netdevice.h:3094 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0x16d7/0x2530 net/ipv4/ip_output.c:236 __ip_finish_output net/ipv4/ip_output.c:314 [inline] __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:296 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:324 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:450 [inline] ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:130 __ip_queue_xmit+0x747/0x1940 net/ipv4/ip_output.c:536 __tcp_transmit_skb+0x2a4c/0x3dc0 net/ipv4/tcp_output.c:1466 __tcp_send_ack.part.0+0x390/0x720 net/ipv4/tcp_output.c:4268 __tcp_send_ack net/ipv4/tcp_output.c:4274 [inline] tcp_send_ack+0x82/0xa0 net/ipv4/tcp_output.c:4274 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6576 [inline] tcp_rcv_state_process+0x4332/0x4f30 net/ipv4/tcp_input.c:6770 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1938 sk_backlog_rcv include/net/sock.h:1115 [inline] __release_sock+0x31b/0x400 net/core/sock.c:3072 release_sock+0x5a/0x220 net/core/sock.c:3626 mptcp_connect+0xc14/0xee0 net/mptcp/protocol.c:3800 __inet_stream_connect+0x3ca/0x1020 net/ipv4/af_inet.c:679 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:750 __sys_connect_file+0x150/0x190 net/socket.c:2071 __sys_connect+0x147/0x180 net/socket.c:2088 __do_sys_connect net/socket.c:2098 [inline] __se_sys_connect net/socket.c:2095 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2095 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68acb7e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f68ada08038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f68acd35f80 RCX: 00007f68acb7e719 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f68acbf132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f68acd35f80 R15: 00007ffdea14cb48 ================================================================== Oops: general protection fault, probably for non-canonical address 0xdffffc000000013a: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000009d0-0x00000000000009d7] CPU: 1 UID: 0 PID: 28966 Comm: syz.4.10809 Tainted: G B 6.12.0-rc4-syzkaller-00261-g850925a8133c #0 Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] RIP: 0010:smc_tcp_syn_recv_sock+0xb8/0x4b0 net/smc/af_smc.c:131 Code: ad d4 09 00 00 be 04 00 00 00 44 8b bb 1c 04 00 00 4c 89 ef e8 69 94 2e f7 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 34 RSP: 0018:ffffc90000a18668 EFLAGS: 00010217 RAX: dffffc0000000000 RBX: ffff88805b9cb600 RCX: ffffffff814e856f RDX: 000000000000013a RSI: ffffffff81ee031e RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 6e696c6261736944 R12: ffff88807df5bd00 R13: 00000000000009d4 R14: ffffc90000a186e8 R15: 0000000000000000 FS: 00007f68ada086c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f68ad9e7d58 CR3: 000000005e3fa000 CR4: 0000000000350ef0 Call Trace: tcp_get_cookie_sock+0xd5/0x790 net/ipv4/syncookies.c:204 cookie_v4_check+0xcf8/0x1d40 net/ipv4/syncookies.c:485 tcp_v4_cookie_check net/ipv4/tcp_ipv4.c:1864 [inline] tcp_v4_do_rcv+0x98e/0xa90 net/ipv4/tcp_ipv4.c:1923 tcp_v4_rcv+0x3cd2/0x4390 net/ipv4/tcp_ipv4.c:2340 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5666 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5779 process_backlog+0x443/0x15f0 net/core/dev.c:6111 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:6775 napi_poll net/core/dev.c:6844 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6966 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:919 [inline] __dev_queue_xmit+0x887/0x4350 net/core/dev.c:4455 dev_queue_xmit include/linux/netdevice.h:3094 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0x16d7/0x2530 net/ipv4/ip_output.c:236 __ip_finish_output net/ipv4/ip_output.c:314 [inline] __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:296 ip_finish_output+0x31/0x310 net/ipv4/ip_output.c:324 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:434 dst_output include/net/dst.h:450 [inline] ip_local_out+0x33e/0x4a0 net/ipv4/ip_output.c:130 __ip_queue_xmit+0x747/0x1940 net/ipv4/ip_output.c:536 __tcp_transmit_skb+0x2a4c/0x3dc0 net/ipv4/tcp_output.c:1466 __tcp_send_ack.part.0+0x390/0x720 net/ipv4/tcp_output.c:4268 __tcp_send_ack net/ipv4/tcp_output.c:4274 [inline] tcp_send_ack+0x82/0xa0 net/ipv4/tcp_output.c:4274 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6576 [inline] tcp_rcv_state_process+0x4332/0x4f30 net/ipv4/tcp_input.c:6770 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1938 sk_backlog_rcv include/net/sock.h:1115 [inline] __release_sock+0x31b/0x400 net/core/sock.c:3072 release_sock+0x5a/0x220 net/core/sock.c:3626 mptcp_connect+0xc14/0xee0 net/mptcp/protocol.c:3800 __inet_stream_connect+0x3ca/0x1020 net/ipv4/af_inet.c:679 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:750 __sys_connect_file+0x150/0x190 net/socket.c:2071 __sys_connect+0x147/0x180 net/socket.c:2088 __do_sys_connect net/socket.c:2098 [inline] __se_sys_connect net/socket.c:2095 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2095 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f68acb7e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f68ada08038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007f68acd35f80 RCX: 00007f68acb7e719 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007f68acbf132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f68acd35f80 R15: 00007ffdea14cb48 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline] RIP: 0010:raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:457 [inline] RIP: 0010:atomic_read include/linux/atomic/atomic-instrumented.h:33 [inline] RIP: 0010:smc_tcp_syn_recv_sock+0xb8/0x4b0 net/smc/af_smc.c:131 Code: ad d4 09 00 00 be 04 00 00 00 44 8b bb 1c 04 00 00 4c 89 ef e8 69 94 2e f7 4c 89 ea 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 34 RSP: 0018:ffffc90000a18668 EFLAGS: 00010217 RAX: dffffc0000000000 RBX: ffff88805b9cb600 RCX: ffffffff814e856f RDX: 000000000000013a RSI: ffffffff81ee031e RDI: 0000000000000007 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 6e696c6261736944 R12: ffff88807df5bd00 R13: 00000000000009d4 R14: ffffc90000a186e8 R15: 0000000000000000 FS: 00007f68ada086c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f68ad9e7d58 CR3: 000000005e3fa000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 09 00 or %eax,(%rax) 2: 00 be 04 00 00 00 add %bh,0x4(%rsi) 8: 44 8b bb 1c 04 00 00 mov 0x41c(%rbx),%r15d f: 4c 89 ef mov %r13,%rdi 12: e8 69 94 2e f7 call 0xf72e9480 17: 4c 89 ea mov %r13,%rdx 1a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 21: fc ff df 24: 48 c1 ea 03 shr $0x3,%rdx * 28: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction 2c: 4c 89 e8 mov %r13,%rax 2f: 83 e0 07 and $0x7,%eax 32: 83 c0 03 add $0x3,%eax 35: 38 d0 cmp %dl,%al 37: 7c 08 jl 0x41 39: 84 d2 test %dl,%dl 3b: 0f .byte 0xf 3c: 85 .byte 0x85 3d: 34 .byte 0x34 --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup