[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.315917] audit: type=1800 audit(1546139185.419:25): pid=8030 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 42.352219] audit: type=1800 audit(1546139185.419:26): pid=8030 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 42.380892] audit: type=1800 audit(1546139185.429:27): pid=8030 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.41' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 51.288356] ------------[ cut here ]------------ [ 51.293179] kernel BUG at net/core/skbuff.c:1459! [ 51.298145] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 51.303512] CPU: 0 PID: 8184 Comm: syz-executor774 Not tainted 4.20.0+ #175 [ 51.310591] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.319986] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 51.324992] 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 [ 51.343883] RSP: 0018:ffff888090c27190 EFLAGS: 00010293 [ 51.349232] RAX: ffff888090f6e140 RBX: ffff888098479800 RCX: ffffffff861ad06a [ 51.356491] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005 [ 51.363750] RBP: ffff888090c27390 R08: ffff888090f6e140 R09: ffffed101308f31a [ 51.371004] R10: ffffed101308f31a R11: ffff8880984798d7 R12: ffff8880984798bc [ 51.378263] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 51.385522] FS: 00007fcee957a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.393733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.399598] CR2: 0000000020000300 CR3: 00000000a6a72000 CR4: 00000000001406f0 [ 51.406866] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.414132] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.421398] Call Trace: [ 51.424008] ? __switch_to_asm+0x34/0x70 [ 51.428058] ? __switch_to_asm+0x40/0x70 [ 51.432148] ? __switch_to_asm+0x34/0x70 [ 51.436191] ? __switch_to_asm+0x40/0x70 [ 51.440267] ? __schedule+0x874/0x1ed0 [ 51.444146] ? __pskb_copy_fclone+0xe80/0xe80 [ 51.448625] ? graph_lock+0x270/0x270 [ 51.452404] ? graph_lock+0x270/0x270 [ 51.456186] ? graph_lock+0x270/0x270 [ 51.460003] ? graph_lock+0x270/0x270 [ 51.463794] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.469311] ? find_held_lock+0x36/0x1c0 [ 51.473403] __pskb_pull_tail+0x156/0x18a0 [ 51.477629] ? __might_fault+0x12b/0x1e0 [ 51.481706] ? skb_realloc_headroom+0x120/0x120 [ 51.486373] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 51.491809] ? __might_fault+0x1a3/0x1e0 [ 51.495854] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.501378] ? _copy_to_iter+0x3b8/0x1440 [ 51.505541] ? proto_seq_start+0x50/0x50 [ 51.509621] ip6_datagram_recv_specific_ctl+0x1953/0x1bf0 [ 51.515145] ? iov_iter_copy_from_user_atomic+0x1030/0x1030 [ 51.520860] ? ip6_datagram_recv_common_ctl+0x5c0/0x5c0 [ 51.526210] ? simple_copy_to_iter+0x35/0x40 [ 51.530616] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.536159] ? __skb_datagram_iter+0x1a7/0x7e0 [ 51.540778] ? rcu_pm_notify+0xc0/0xc0 [ 51.544650] ? skb_kill_datagram+0x120/0x120 [ 51.549043] ? skb_copy_datagram_iter+0x10d/0x4a0 [ 51.553889] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.559411] ? ip6_datagram_recv_common_ctl+0x35a/0x5c0 [ 51.564758] ? ipv6_recv_rxpmtu+0x920/0x920 [ 51.569073] ? __might_fault+0x12b/0x1e0 [ 51.573139] ? lock_downgrade+0x900/0x900 [ 51.577293] ip6_datagram_recv_ctl+0x33/0x40 [ 51.581704] rawv6_recvmsg+0xc4b/0xea0 [ 51.585584] ? rawv6_rcv_skb+0x480/0x480 [ 51.589645] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.595189] sock_common_recvmsg+0x13a/0x2a0 [ 51.599590] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.605035] ? move_addr_to_kernel.part.18+0x100/0x100 [ 51.610306] ? security_socket_recvmsg+0x9c/0xc0 [ 51.615044] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.620502] sock_recvmsg+0xd0/0x110 [ 51.624201] ? __sock_recv_ts_and_drops+0x420/0x420 [ 51.629215] ___sys_recvmsg+0x2b6/0x680 [ 51.633199] ? ___sys_sendmsg+0x930/0x930 [ 51.637342] ? release_sock+0x1ec/0x2c0 [ 51.641304] ? __local_bh_enable_ip+0x160/0x260 [ 51.645957] ? __fget_light+0x2e9/0x430 [ 51.649932] ? fget_raw+0x20/0x20 [ 51.653370] ? __local_bh_enable_ip+0x160/0x260 [ 51.658026] ? ip6_datagram_connect+0x3a/0x50 [ 51.662506] ? ip6_datagram_connect_v6_only+0x71/0x90 [ 51.667690] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 51.673232] ? sockfd_lookup_light+0xc5/0x160 [ 51.677757] __sys_recvmsg+0x11a/0x280 [ 51.681628] ? __ia32_sys_sendmmsg+0x100/0x100 [ 51.686237] ? __x64_sys_futex+0x476/0x690 [ 51.690457] ? do_syscall_64+0x9a/0x820 [ 51.694428] ? do_syscall_64+0x9a/0x820 [ 51.698431] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 51.703882] ? trace_hardirqs_off+0xb8/0x310 [ 51.708282] __x64_sys_recvmsg+0x78/0xb0 [ 51.712329] do_syscall_64+0x1b9/0x820 [ 51.716257] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 51.721612] ? syscall_return_slowpath+0x5e0/0x5e0 [ 51.726525] ? trace_hardirqs_on_caller+0x310/0x310 [ 51.731522] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.736522] ? recalc_sigpending_tsk+0x180/0x180 [ 51.741268] ? __switch_to_asm+0x40/0x70 [ 51.745325] ? __switch_to_asm+0x34/0x70 [ 51.749392] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.754234] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.759424] RIP: 0033:0x4457e9 [ 51.762621] 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 [ 51.781636] RSP: 002b:00007fcee9579da8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 51.789346] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 00000000004457e9 [ 51.796605] RDX: 0000000000000002 RSI: 0000000020000140 RDI: 0000000000000004 [ 51.803866] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 51.811118] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac3c [ 51.818397] R13: 0100000000000000 R14: 00007fcee957a9c0 R15: 00000000006dad2c [ 51.825672] Modules linked in: [ 51.829478] ---[ end trace 0a52d49ac2541eb3 ]--- [ 51.834289] RIP: 0010:pskb_expand_head+0xc24/0x10d0 [ 51.839305] 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 [ 51.858586] RSP: 0018:ffff888090c27190 EFLAGS: 00010293 [ 51.864000] RAX: ffff888090f6e140 RBX: ffff888098479800 RCX: ffffffff861ad06a [ 51.871266] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005 [ 51.878581] RBP: ffff888090c27390 R08: ffff888090f6e140 R09: ffffed101308f31a [ 51.885996] R10: ffffed101308f31a R11: ffff8880984798d7 R12: ffff8880984798bc [ 51.893311] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000 [ 51.900589] FS: 00007fcee957a700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.908876] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.914778] CR2: 0000000020000300 CR3: 00000000a6a72000 CR4: 00000000001406f0 [ 51.922045] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.929347] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.936643] Kernel panic - not syncing: Fatal exception [ 51.942989] Kernel Offset: disabled [ 51.946618] Rebooting in 86400 seconds..