[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.407132] audit: type=1800 audit(1546132147.510:25): pid=7943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.441518] audit: type=1800 audit(1546132147.510:26): pid=7943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.461788] audit: type=1800 audit(1546132147.520:27): pid=7943 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 syzkaller login: [ 44.871276] sshd (8079) used greatest stack depth: 15736 bytes left Warning: Permanently added '10.128.0.72' (ECDSA) to the list of known hosts. executing program [ 51.418314] ------------[ cut here ]------------ [ 51.423087] kernel BUG at net/core/skbuff.c:1459! [ 51.428273] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 51.433757] CPU: 0 PID: 8095 Comm: syz-executor841 Not tainted 4.20.0+ #253 [ 51.440841] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.450204] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 51.455339] 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 [ 51.474490] RSP: 0018:ffff8880a7daf190 EFLAGS: 00010293 [ 51.479856] RAX: ffff8880901fc3c0 RBX: ffff8880934e7bc0 RCX: ffffffff861ead2a [ 51.487114] RDX: 0000000000000000 RSI: ffffffff861eb7a4 RDI: 0000000000000005 [ 51.494746] RBP: ffff8880a7daf390 R08: ffff8880901fc3c0 R09: ffffed101269cf92 [ 51.502006] R10: ffffed101269cf92 R11: ffff8880934e7c97 R12: ffff8880934e7c7c [ 51.509263] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 51.516523] FS: 00007fbbf7a0f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.524737] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.530639] CR2: 0000000020000300 CR3: 000000009dc29000 CR4: 00000000001406f0 [ 51.537927] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.545189] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.552458] Call Trace: [ 51.555055] ? __schedule+0x874/0x1ed0 [ 51.558941] ? __pskb_copy_fclone+0xe80/0xe80 [ 51.563428] ? graph_lock+0x270/0x270 [ 51.567218] ? graph_lock+0x270/0x270 [ 51.571019] ? graph_lock+0x270/0x270 [ 51.574822] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.580345] ? find_held_lock+0x36/0x1c0 [ 51.584402] __pskb_pull_tail+0x156/0x18a0 [ 51.588623] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 51.593738] ? lockdep_hardirqs_on+0x421/0x5c0 [ 51.598309] ? skb_realloc_headroom+0x120/0x120 [ 51.602959] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 51.608401] ? zerocopy_sg_from_iter+0x110/0x110 [ 51.613246] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 51.618344] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.623869] ? __skb_try_recv_datagram+0x382/0x5b0 [ 51.628789] ? proto_seq_start+0x50/0x50 [ 51.632842] ip6_datagram_recv_specific_ctl+0x1953/0x1bf0 [ 51.638373] ? ip6_datagram_recv_common_ctl+0x5c0/0x5c0 [ 51.643726] ? iov_iter_fault_in_readable+0x450/0x450 [ 51.648907] ? rcu_lockdep_current_cpu_online+0x1a4/0x210 [ 51.654448] ? rcu_pm_notify+0xc0/0xc0 [ 51.658327] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.663855] ? skb_copy_datagram_iter+0x262/0xc00 [ 51.668690] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.674218] ? ip6_datagram_recv_common_ctl+0x35a/0x5c0 [ 51.679568] ? ipv6_recv_rxpmtu+0x920/0x920 [ 51.683876] ? arch_local_save_flags+0x40/0x40 [ 51.688442] ? __might_fault+0x12b/0x1e0 [ 51.692488] ? lock_downgrade+0x900/0x900 [ 51.696621] ip6_datagram_recv_ctl+0x33/0x40 [ 51.701015] rawv6_recvmsg+0xc4b/0xea0 [ 51.704889] ? rawv6_rcv_skb+0x480/0x480 [ 51.708934] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.714465] sock_common_recvmsg+0x13a/0x2a0 [ 51.718871] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.724316] ? apparmor_socket_recvmsg+0x29/0x30 [ 51.729065] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.734597] ? security_socket_recvmsg+0x9c/0xc0 [ 51.739356] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.744798] sock_recvmsg+0xd0/0x110 [ 51.748502] ? __sock_recv_ts_and_drops+0x420/0x420 [ 51.753511] ___sys_recvmsg+0x2b6/0x680 [ 51.757477] ? ___sys_sendmsg+0x930/0x930 [ 51.761618] ? release_sock+0x1ec/0x2c0 [ 51.765588] ? __local_bh_enable_ip+0x160/0x260 [ 51.770261] ? __fget_light+0x2e9/0x430 [ 51.774224] ? fget_raw+0x20/0x20 [ 51.777668] ? __local_bh_enable_ip+0x160/0x260 [ 51.782349] ? ip6_datagram_connect+0x3a/0x50 [ 51.786838] ? ip6_datagram_connect_v6_only+0x71/0x90 [ 51.792021] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.797564] ? sockfd_lookup_light+0xc5/0x160 [ 51.802052] __sys_recvmsg+0x11a/0x280 [ 51.805931] ? __ia32_sys_sendmmsg+0x100/0x100 [ 51.810504] ? __x64_sys_futex+0x47f/0x6a0 [ 51.814742] ? do_syscall_64+0x9a/0x820 [ 51.818704] ? do_syscall_64+0x9a/0x820 [ 51.822673] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 51.828111] ? trace_hardirqs_off+0xb8/0x310 [ 51.832508] __x64_sys_recvmsg+0x78/0xb0 [ 51.836564] do_syscall_64+0x1b9/0x820 [ 51.840441] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.845795] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.850714] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.855719] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.860721] ? recalc_sigpending_tsk+0x180/0x180 [ 51.865462] ? __switch_to_asm+0x40/0x70 [ 51.869506] ? __switch_to_asm+0x34/0x70 [ 51.873558] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.878396] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.883575] RIP: 0033:0x4457e9 [ 51.886760] 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 [ 51.905652] RSP: 002b:00007fbbf7a0eda8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 51.913356] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 00000000004457e9 [ 51.920631] RDX: 0000000000000002 RSI: 0000000020000140 RDI: 0000000000000004 [ 51.927909] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 51.935181] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 51.942442] R13: 0100000000000000 R14: 00007fbbf7a0f9c0 R15: 00000000006dad2c [ 51.949702] Modules linked in: [ 51.953665] ---[ end trace 4c1e1d439487f624 ]--- [ 51.958478] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 51.963506] 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 [ 51.982521] RSP: 0018:ffff8880a7daf190 EFLAGS: 00010293 [ 51.987928] RAX: ffff8880901fc3c0 RBX: ffff8880934e7bc0 RCX: ffffffff861ead2a [ 51.995249] RDX: 0000000000000000 RSI: ffffffff861eb7a4 RDI: 0000000000000005 [ 52.002521] RBP: ffff8880a7daf390 R08: ffff8880901fc3c0 R09: ffffed101269cf92 [ 52.009842] R10: ffffed101269cf92 R11: ffff8880934e7c97 R12: ffff8880934e7c7c [ 52.017168] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 52.024436] FS: 00007fbbf7a0f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 52.032720] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 52.038635] CR2: 0000000020000300 CR3: 000000009dc29000 CR4: 00000000001406f0 [ 52.045962] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.053238] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.060561] Kernel panic - not syncing: Fatal exception [ 52.066874] Kernel Offset: disabled [ 52.070505] Rebooting in 86400 seconds..