[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 39.724160] audit: type=1800 audit(1546837398.695:25): pid=7824 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 39.743346] audit: type=1800 audit(1546837398.695:26): pid=7824 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 39.830700] audit: type=1800 audit(1546837398.805:27): pid=7824 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 '10.128.0.95' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 51.310907] ------------[ cut here ]------------ [ 51.315688] kernel BUG at net/core/skbuff.c:1459! [ 51.321186] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 51.326545] CPU: 0 PID: 7977 Comm: syz-executor181 Not tainted 4.20.0+ #13 [ 51.333534] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.342900] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 51.347902] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 a6 ca 68 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 97 ca 68 fb 0f 0b e8 90 ca 68 fb <0f> 0b e8 89 ca 68 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 51.366787] RSP: 0018:ffff88809093f5e0 EFLAGS: 00010293 [ 51.372135] RAX: ffff8880970b4480 RBX: ffff8880936c3800 RCX: ffffffff86192268 [ 51.379386] RDX: 0000000000000000 RSI: ffffffff86192ca0 RDI: 0000000000000005 [ 51.386725] RBP: ffff88809093f720 R08: ffff8880970b4480 R09: ffffed10126d871b [ 51.393982] R10: ffffed10126d871a R11: ffff8880936c38d7 R12: ffff8880936c38bc [ 51.401230] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 51.408482] FS: 00007f9828c70700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.416689] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.422555] CR2: 0000000020000300 CR3: 0000000089158000 CR4: 00000000001406f0 [ 51.429810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.437064] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.444346] Call Trace: [ 51.446959] ? lock_acquire+0x1db/0x570 [ 51.450915] ? lock_downgrade+0x910/0x910 [ 51.455069] ? skb_release_data+0x970/0x970 [ 51.459415] ? lockdep_hardirqs_on+0x415/0x5d0 [ 51.464013] __pskb_pull_tail+0x13a/0x1740 [ 51.468249] ? _copy_to_iter+0x3a1/0x1400 [ 51.472385] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 51.477472] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.483007] ? __skb_try_recv_datagram+0x448/0x5b0 [ 51.487918] ? pskb_carve+0x1e20/0x1e20 [ 51.491873] ? __check_object_size+0xa3/0x77a [ 51.496361] ? iov_iter_copy_from_user_atomic+0xff0/0xff0 [ 51.501880] ? usercopy_warn+0x110/0x110 [ 51.505939] ? ___might_sleep+0x1e7/0x310 [ 51.510070] ? arch_local_save_flags+0x50/0x50 [ 51.514637] ? __fget+0x472/0x710 [ 51.518076] ip6_datagram_recv_specific_ctl+0x1751/0x1bd0 [ 51.523599] ? ip6_datagram_recv_common_ctl+0x5e0/0x5e0 [ 51.528945] ? skb_kill_datagram+0x130/0x130 [ 51.533354] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 51.538879] ? ip6_datagram_recv_common_ctl+0x37b/0x5e0 [ 51.544223] ? skb_copy_datagram_iter+0x10d/0x490 [ 51.549055] ? ipv6_recv_rxpmtu+0x920/0x920 [ 51.553391] ? skb_copy_and_hash_datagram_iter+0x50/0x50 [ 51.558824] ip6_datagram_recv_ctl+0x34/0x40 [ 51.563215] rawv6_recvmsg+0xc43/0xe90 [ 51.567085] ? aa_sk_perm+0x234/0x8e0 [ 51.570867] ? rawv6_rcv_skb+0x470/0x470 [ 51.574924] ? __fget_light+0x2db/0x420 [ 51.578880] sock_common_recvmsg+0x13f/0x2b0 [ 51.583272] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.588704] ? apparmor_socket_recvmsg+0x2a/0x30 [ 51.593441] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 51.598959] ? security_socket_recvmsg+0x9b/0xd0 [ 51.603711] ? compat_sock_common_getsockopt+0x150/0x150 [ 51.609147] sock_recvmsg+0xd0/0x110 [ 51.612846] __sys_recvfrom+0x30b/0x5d0 [ 51.616821] ? __ia32_sys_send+0x100/0x100 [ 51.621045] ? __sys_sendmsg+0x1a3/0x270 [ 51.625092] ? do_syscall_64+0x8c/0x800 [ 51.629059] ? do_syscall_64+0x8c/0x800 [ 51.633025] ? lockdep_hardirqs_on+0x415/0x5d0 [ 51.637593] ? trace_hardirqs_on+0xbd/0x310 [ 51.641911] ? do_futex+0x2910/0x2910 [ 51.645716] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.651064] ? trace_hardirqs_off_caller+0x300/0x300 [ 51.656162] __x64_sys_recvfrom+0xe1/0x1a0 [ 51.660388] do_syscall_64+0x1a3/0x800 [ 51.664262] ? syscall_return_slowpath+0x5f0/0x5f0 [ 51.669175] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 51.674170] ? __switch_to_asm+0x34/0x70 [ 51.678212] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 51.683564] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 51.688750] RIP: 0033:0x445809 [ 51.691925] 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 [ 51.710810] RSP: 002b:00007f9828c6fda8 EFLAGS: 00000216 ORIG_RAX: 000000000000002d [ 51.718505] RAX: ffffffffffffffda RBX: 00000000006dac38 RCX: 0000000000445809 [ 51.725754] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 51.733006] RBP: 00000000006dac30 R08: 0000000000000000 R09: 0000000000000000 [ 51.740255] R10: 0000000000000002 R11: 0000000000000216 R12: 00000000006dac3c [ 51.747506] R13: 00007fffb20ee30f R14: 00007f9828c709c0 R15: 00000000006dad2c [ 51.754758] Modules linked in: [ 51.758876] ---[ end trace a45e4ed51e9b6716 ]--- [ 51.763714] RIP: 0010:pskb_expand_head+0xbb0/0x1080 [ 51.768737] Code: 8b b5 e0 fe ff ff 48 85 f6 0f 84 4d fe ff ff e8 a6 ca 68 fb 4d 8d 74 24 ff e9 3e fe ff ff e8 97 ca 68 fb 0f 0b e8 90 ca 68 fb <0f> 0b e8 89 ca 68 fb 81 8d 10 ff ff ff 00 20 00 00 e9 0f f6 ff ff [ 51.787899] RSP: 0018:ffff88809093f5e0 EFLAGS: 00010293 [ 51.793299] RAX: ffff8880970b4480 RBX: ffff8880936c3800 RCX: ffffffff86192268 [ 51.800587] RDX: 0000000000000000 RSI: ffffffff86192ca0 RDI: 0000000000000005 [ 51.807851] RBP: ffff88809093f720 R08: ffff8880970b4480 R09: ffffed10126d871b [ 51.815132] R10: ffffed10126d871a R11: ffff8880936c38d7 R12: ffff8880936c38bc [ 51.822449] R13: 000000000000003f R14: dffffc0000000000 R15: 0000000000000000 [ 51.829816] FS: 00007f9828c70700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 51.838063] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 51.844027] CR2: 0000000020000300 CR3: 0000000089158000 CR4: 00000000001406f0 [ 51.851332] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 51.858629] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 51.865956] Kernel panic - not syncing: Fatal exception [ 51.872281] Kernel Offset: disabled [ 51.875907] Rebooting in 86400 seconds..