[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.557067] audit: type=1800 audit(1546139251.253:25): pid=7937 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.594275] audit: type=1800 audit(1546139251.253:26): pid=7937 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.616679] audit: type=1800 audit(1546139251.253:27): pid=7937 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 48.039343] ------------[ cut here ]------------ [ 48.044154] kernel BUG at net/core/skbuff.c:1459! [ 48.049397] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 48.054778] CPU: 0 PID: 8089 Comm: syz-executor853 Not tainted 4.20.0+ #396 [ 48.061868] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.071220] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 48.076214] Code: 8b 85 20 fe ff ff 48 85 c0 0f 84 44 fe ff ff e8 72 11 67 fb 4d 8d 74 24 ff e9 35 fe ff ff e8 63 11 67 fb 0f 0b e8 5c 11 67 fb <0f> 0b e8 55 11 67 fb 31 f6 31 ff e8 1c 12 67 fb e9 6a fd ff ff 4c [ 48.095094] RSP: 0018:ffff88809fb37190 EFLAGS: 00010293 [ 48.100443] RAX: ffff88808e8f24c0 RBX: ffff888095552e80 RCX: ffffffff861ad06a [ 48.107705] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005 [ 48.114954] RBP: ffff88809fb37390 R08: ffff88808e8f24c0 R09: ffffed1012aaa5ea [ 48.122212] R10: ffffed1012aaa5ea R11: ffff888095552f57 R12: ffff888095552f3c [ 48.129469] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 48.136731] FS: 00007f0840db7700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 48.144952] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.150818] CR2: 0000000020000300 CR3: 000000009e678000 CR4: 00000000001406f0 [ 48.158070] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.165319] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.172566] Call Trace: [ 48.175146] ? __switch_to_asm+0x34/0x70 [ 48.179192] ? __switch_to_asm+0x40/0x70 [ 48.183233] ? __switch_to_asm+0x34/0x70 [ 48.187287] ? __switch_to_asm+0x40/0x70 [ 48.191329] ? __schedule+0x874/0x1ed0 [ 48.195199] ? __pskb_copy_fclone+0xe80/0xe80 [ 48.199678] ? graph_lock+0x270/0x270 [ 48.203458] ? graph_lock+0x270/0x270 [ 48.207239] ? graph_lock+0x270/0x270 [ 48.211015] ? graph_lock+0x270/0x270 [ 48.214804] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.220325] ? find_held_lock+0x36/0x1c0 [ 48.224367] __pskb_pull_tail+0x156/0x18a0 [ 48.228587] ? __might_fault+0x12b/0x1e0 [ 48.232648] ? skb_realloc_headroom+0x120/0x120 [ 48.237300] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 48.242737] ? __might_fault+0x1a3/0x1e0 [ 48.246787] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.252306] ? _copy_to_iter+0x3b8/0x1440 [ 48.256434] ? proto_seq_start+0x50/0x50 [ 48.260481] ip6_datagram_recv_specific_ctl+0x1953/0x1bf0 [ 48.266002] ? iov_iter_copy_from_user_atomic+0x1030/0x1030 [ 48.271697] ? ip6_datagram_recv_common_ctl+0x5c0/0x5c0 [ 48.277042] ? simple_copy_to_iter+0x35/0x40 [ 48.281448] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.286965] ? __skb_datagram_iter+0x1a7/0x7e0 [ 48.291526] ? rcu_pm_notify+0xc0/0xc0 [ 48.295402] ? skb_kill_datagram+0x120/0x120 [ 48.299825] ? skb_copy_datagram_iter+0x10d/0x4a0 [ 48.304649] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 48.310183] ? ip6_datagram_recv_common_ctl+0x35a/0x5c0 [ 48.315525] ? ipv6_recv_rxpmtu+0x920/0x920 [ 48.319828] ? arch_local_save_flags+0x40/0x40 [ 48.324409] ? __might_fault+0x12b/0x1e0 [ 48.328449] ? lock_downgrade+0x900/0x900 [ 48.332577] ip6_datagram_recv_ctl+0x33/0x40 [ 48.336985] rawv6_recvmsg+0xc4b/0xea0 [ 48.340869] ? rawv6_rcv_skb+0x480/0x480 [ 48.344912] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.350462] sock_common_recvmsg+0x13a/0x2a0 [ 48.354849] ? compat_sock_common_getsockopt+0x150/0x150 [ 48.360284] ? apparmor_socket_recvmsg+0x29/0x30 [ 48.365039] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.370561] ? security_socket_recvmsg+0x9c/0xc0 [ 48.375296] ? compat_sock_common_getsockopt+0x150/0x150 [ 48.380728] sock_recvmsg+0xd0/0x110 [ 48.384423] ? __sock_recv_ts_and_drops+0x420/0x420 [ 48.389421] ___sys_recvmsg+0x2b6/0x680 [ 48.393377] ? ___sys_sendmsg+0x930/0x930 [ 48.397511] ? release_sock+0x1ec/0x2c0 [ 48.401471] ? __local_bh_enable_ip+0x160/0x260 [ 48.406129] ? __fget_light+0x2e9/0x430 [ 48.410085] ? fget_raw+0x20/0x20 [ 48.413519] ? __local_bh_enable_ip+0x160/0x260 [ 48.418170] ? ip6_datagram_connect+0x3a/0x50 [ 48.422660] ? ip6_datagram_connect_v6_only+0x71/0x90 [ 48.427831] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 48.433706] ? sockfd_lookup_light+0xc5/0x160 [ 48.438184] __sys_recvmsg+0x11a/0x280 [ 48.442069] ? __ia32_sys_sendmmsg+0x100/0x100 [ 48.446637] ? __x64_sys_futex+0x476/0x690 [ 48.450857] ? do_syscall_64+0x9a/0x820 [ 48.454824] ? do_syscall_64+0x9a/0x820 [ 48.458780] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 48.464210] ? trace_hardirqs_off+0xb8/0x310 [ 48.468867] __x64_sys_recvmsg+0x78/0xb0 [ 48.472928] do_syscall_64+0x1b9/0x820 [ 48.476800] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 48.482146] ? syscall_return_slowpath+0x5e0/0x5e0 [ 48.487056] ? trace_hardirqs_on_caller+0x310/0x310 [ 48.492077] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 48.497093] ? recalc_sigpending_tsk+0x180/0x180 [ 48.501829] ? __switch_to_asm+0x40/0x70 [ 48.506030] ? __switch_to_asm+0x34/0x70 [ 48.510076] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 48.514908] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 48.520077] RIP: 0033:0x4457e9 [ 48.523257] Code: e8 6c b6 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 2b 12 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 48.542143] RSP: 002b:00007f0840db6da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 48.549831] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 00000000004457e9 [ 48.557080] RDX: 0000000000000002 RSI: 0000000020000140 RDI: 0000000000000004 [ 48.564325] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 48.571573] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 48.578825] R13: 0100000000000000 R14: 00007f0840db79c0 R15: 00000000006dad2c [ 48.586090] Modules linked in: [ 48.590225] ---[ end trace f912c9cc20f8a3c9 ]--- [ 48.594990] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 48.600579] Code: 8b 85 20 fe ff ff 48 85 c0 0f 84 44 fe ff ff e8 72 11 67 fb 4d 8d 74 24 ff e9 35 fe ff ff e8 63 11 67 fb 0f 0b e8 5c 11 67 fb <0f> 0b e8 55 11 67 fb 31 f6 31 ff e8 1c 12 67 fb e9 6a fd ff ff 4c [ 48.619516] RSP: 0018:ffff88809fb37190 EFLAGS: 00010293 [ 48.624926] RAX: ffff88808e8f24c0 RBX: ffff888095552e80 RCX: ffffffff861ad06a [ 48.632251] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005 [ 48.639549] RBP: ffff88809fb37390 R08: ffff88808e8f24c0 R09: ffffed1012aaa5ea [ 48.646871] R10: ffffed1012aaa5ea R11: ffff888095552f57 R12: ffff888095552f3c [ 48.654145] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 48.661433] FS: 00007f0840db7700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 48.669687] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.675579] CR2: 0000000001e55000 CR3: 000000009e678000 CR4: 00000000001406e0 [ 48.682864] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.690172] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.697470] Kernel panic - not syncing: Fatal exception [ 48.703784] Kernel Offset: disabled [ 48.707407] Rebooting in 86400 seconds..