[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 38.566376] audit: type=1800 audit(1546125923.309:25): pid=7844 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 38.587821] audit: type=1800 audit(1546125923.309:26): pid=7844 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 38.608591] audit: type=1800 audit(1546125923.309:27): pid=7844 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[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 43.845018] sshd (7981) used greatest stack depth: 15736 bytes left Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. executing program [ 50.533932] ------------[ cut here ]------------ [ 50.538822] kernel BUG at net/core/skbuff.c:1459! [ 50.544337] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 50.549706] CPU: 0 PID: 7997 Comm: syz-executor816 Not tainted 4.20.0+ #363 [ 50.556783] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.566129] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 50.571130] Code: 8b 85 20 fe ff ff 48 85 c0 0f 84 44 fe ff ff e8 62 ee 62 fb 4d 8d 74 24 ff e9 35 fe ff ff e8 53 ee 62 fb 0f 0b e8 4c ee 62 fb <0f> 0b e8 45 ee 62 fb 31 f6 31 ff e8 0c ef 62 fb e9 6a fd ff ff 4c [ 50.590013] RSP: 0018:ffff88808a1a7190 EFLAGS: 00010293 [ 50.595357] RAX: ffff888097a16600 RBX: ffff8880a83dce00 RCX: ffffffff861ead2a [ 50.602607] RDX: 0000000000000000 RSI: ffffffff861eb7a4 RDI: 0000000000000005 [ 50.609858] RBP: ffff88808a1a7390 R08: ffff888097a16600 R09: ffffed101507b9da [ 50.617108] R10: ffffed101507b9da R11: ffff8880a83dced7 R12: ffff8880a83dcebc [ 50.624360] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 50.631615] FS: 00007fecffdff700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 50.639997] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 50.645870] CR2: 0000000020000300 CR3: 0000000087a12000 CR4: 00000000001406f0 [ 50.653124] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 50.660375] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 50.667624] Call Trace: [ 50.670198] ? __schedule+0x874/0x1ed0 [ 50.674074] ? __pskb_copy_fclone+0xe80/0xe80 [ 50.678552] ? graph_lock+0x270/0x270 [ 50.682341] ? graph_lock+0x270/0x270 [ 50.686140] ? graph_lock+0x270/0x270 [ 50.689931] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.695453] ? find_held_lock+0x36/0x1c0 [ 50.699497] __pskb_pull_tail+0x156/0x18a0 [ 50.703714] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 50.708814] ? lockdep_hardirqs_on+0x421/0x5c0 [ 50.713384] ? skb_realloc_headroom+0x120/0x120 [ 50.718033] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 50.723466] ? zerocopy_sg_from_iter+0x110/0x110 [ 50.728241] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 50.733329] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.738849] ? __skb_try_recv_datagram+0x382/0x5b0 [ 50.743764] ? proto_seq_start+0x50/0x50 [ 50.747821] ip6_datagram_recv_specific_ctl+0x1953/0x1bf0 [ 50.753350] ? ip6_datagram_recv_common_ctl+0x5c0/0x5c0 [ 50.758694] ? iov_iter_fault_in_readable+0x450/0x450 [ 50.763869] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 50.769386] ? rcu_pm_notify+0xc0/0xc0 [ 50.773261] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.778790] ? skb_copy_datagram_iter+0x262/0xc00 [ 50.783617] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 50.789134] ? ip6_datagram_recv_common_ctl+0x35a/0x5c0 [ 50.794479] ? ipv6_recv_rxpmtu+0x920/0x920 [ 50.798793] ? arch_local_save_flags+0x40/0x40 [ 50.803356] ? __might_fault+0x12b/0x1e0 [ 50.807396] ? lock_downgrade+0x900/0x900 [ 50.811529] ip6_datagram_recv_ctl+0x33/0x40 [ 50.815935] rawv6_recvmsg+0xc4b/0xea0 [ 50.819808] ? rawv6_rcv_skb+0x480/0x480 [ 50.823856] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.829386] sock_common_recvmsg+0x13a/0x2a0 [ 50.833781] ? compat_sock_common_getsockopt+0x150/0x150 [ 50.839212] ? apparmor_socket_recvmsg+0x29/0x30 [ 50.843954] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 50.849472] ? security_socket_recvmsg+0x9c/0xc0 [ 50.854209] ? compat_sock_common_getsockopt+0x150/0x150 [ 50.859637] sock_recvmsg+0xd0/0x110 [ 50.863339] ? __sock_recv_ts_and_drops+0x420/0x420 [ 50.868337] ___sys_recvmsg+0x2b6/0x680 [ 50.872338] ? ___sys_sendmsg+0x930/0x930 [ 50.876470] ? release_sock+0x1ec/0x2c0 [ 50.880429] ? __local_bh_enable_ip+0x160/0x260 [ 50.885082] ? __fget_light+0x2e9/0x430 [ 50.889121] ? fget_raw+0x20/0x20 [ 50.892553] ? __local_bh_enable_ip+0x160/0x260 [ 50.897203] ? ip6_datagram_connect+0x3a/0x50 [ 50.901679] ? ip6_datagram_connect_v6_only+0x71/0x90 [ 50.906852] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 50.912383] ? sockfd_lookup_light+0xc5/0x160 [ 50.916860] __sys_recvmsg+0x11a/0x280 [ 50.920730] ? __ia32_sys_sendmmsg+0x100/0x100 [ 50.925302] ? __x64_sys_futex+0x47f/0x6a0 [ 50.929525] ? do_syscall_64+0x9a/0x820 [ 50.933479] ? do_syscall_64+0x9a/0x820 [ 50.937440] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 50.942871] ? trace_hardirqs_off+0xb8/0x310 [ 50.947259] __x64_sys_recvmsg+0x78/0xb0 [ 50.951305] do_syscall_64+0x1b9/0x820 [ 50.955181] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 50.960525] ? syscall_return_slowpath+0x5e0/0x5e0 [ 50.965435] ? trace_hardirqs_on_caller+0x310/0x310 [ 50.970452] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 50.975450] ? recalc_sigpending_tsk+0x180/0x180 [ 50.980187] ? __switch_to_asm+0x40/0x70 [ 50.984226] ? __switch_to_asm+0x34/0x70 [ 50.988267] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 50.993093] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 50.998262] RIP: 0033:0x4457e9 [ 51.001445] 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 [ 51.020354] RSP: 002b:00007fecffdfeda8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 51.028041] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 00000000004457e9 [ 51.035289] RDX: 0000000000000002 RSI: 0000000020000140 RDI: 0000000000000004 [ 51.042542] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 51.049806] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 51.057057] R13: 0100000000000000 R14: 00007fecffdff9c0 R15: 00000000006dad2c [ 51.064326] Modules linked in: [ 51.068369] ---[ end trace deb74395931e0e31 ]--- [ 51.073171] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 51.078183] Code: 8b 85 20 fe ff ff 48 85 c0 0f 84 44 fe ff ff e8 62 ee 62 fb 4d 8d 74 24 ff e9 35 fe ff ff e8 53 ee 62 fb 0f 0b e8 4c ee 62 fb <0f> 0b e8 45 ee 62 fb 31 f6 31 ff e8 0c ef 62 fb e9 6a fd ff ff 4c [ 51.097359] RSP: 0018:ffff88808a1a7190 EFLAGS: 00010293 [ 51.102750] RAX: ffff888097a16600 RBX: ffff8880a83dce00 RCX: ffffffff861ead2a [ 51.110017] RDX: 0000000000000000 RSI: ffffffff861eb7a4 RDI: 0000000000000005 [ 51.117309] RBP: ffff88808a1a7390 R08: ffff888097a16600 R09: ffffed101507b9da [ 51.124599] R10: ffffed101507b9da R11: ffff8880a83dced7 R12: ffff8880a83dcebc [ 51.131884] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 51.139152] FS: 00007fecffdff700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.147410] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.153332] CR2: 0000000020000300 CR3: 0000000087a12000 CR4: 00000000001406f0 [ 51.160602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.167886] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.175168] Kernel panic - not syncing: Fatal exception [ 51.181565] Kernel Offset: disabled [ 51.185188] Rebooting in 86400 seconds..