[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
Starting mcstransd: 
[....] Starting file context maintaining daemon: restorecond[?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: [   52.111851] kauditd_printk_skb: 4 callbacks suppressed
[   52.111866] audit: type=1400 audit(1546149097.032:35): avc:  denied  { map } for  pid=8602 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1
[   52.158870] sshd (8600) used greatest stack depth: 15720 bytes left
Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts.
executing program
[   58.982673] audit: type=1400 audit(1546149103.902:36): avc:  denied  { map } for  pid=8614 comm="syz-executor102" path="/root/syz-executor102011715" dev="sda1" ino=16484 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
[   59.013197] ------------[ cut here ]------------
[   59.017944] kernel BUG at net/core/skbuff.c:1459!
[   59.023074] invalid opcode: 0000 [#1] PREEMPT SMP KASAN
[   59.028445] CPU: 0 PID: 8616 Comm: syz-executor102 Not tainted 4.20.0+ #176
[   59.035521] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   59.045090] RIP: 0010:pskb_expand_head+0xc24/0x10d0
[   59.050086] 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
[   59.068968] RSP: 0018:ffff8880920cf190 EFLAGS: 00010293
[   59.074311] RAX: ffff8880902f06c0 RBX: ffff88809ce31b80 RCX: ffffffff861ad06a
[   59.081563] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005
[   59.088810] RBP: ffff8880920cf390 R08: ffff8880902f06c0 R09: ffffed10139c638a
[   59.096221] R10: ffffed10139c638a R11: ffff88809ce31c57 R12: ffff88809ce31c3c
[   59.103483] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000
[   59.110748] FS:  00007f8d9044f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[   59.118974] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   59.124835] CR2: 00007f8d9044ee78 CR3: 00000000a5c47000 CR4: 00000000001406f0
[   59.132086] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   59.139335] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   59.146582] Call Trace:
[   59.149152]  ? __switch_to_asm+0x34/0x70
[   59.153195]  ? __switch_to_asm+0x40/0x70
[   59.157269]  ? __switch_to_asm+0x34/0x70
[   59.161315]  ? __switch_to_asm+0x40/0x70
[   59.165363]  ? __lock_acquire+0x62f/0x4c20
[   59.169583]  ? __pskb_copy_fclone+0xe80/0xe80
[   59.174062]  ? graph_lock+0x270/0x270
[   59.177846]  ? graph_lock+0x270/0x270
[   59.181627]  ? mark_held_locks+0x130/0x130
[   59.185888]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.191423]  ? find_held_lock+0x36/0x1c0
[   59.195464]  __pskb_pull_tail+0x156/0x18a0
[   59.199678]  ? __might_fault+0x12b/0x1e0
[   59.203723]  ? skb_realloc_headroom+0x120/0x120
[   59.208370]  ? __bpf_trace_preemptirq_template+0x30/0x30
[   59.213805]  ? __might_fault+0x1a3/0x1e0
[   59.217846]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   59.223363]  ? _copy_to_iter+0x3b8/0x1440
[   59.227489]  ? proto_seq_start+0x50/0x50
[   59.231534]  ip6_datagram_recv_specific_ctl+0x1953/0x1bf0
[   59.237052]  ? iov_iter_copy_from_user_atomic+0x1030/0x1030
[   59.242767]  ? ip6_datagram_recv_common_ctl+0x5c0/0x5c0
[   59.248130]  ? simple_copy_to_iter+0x35/0x40
[   59.252522]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.258035]  ? __skb_datagram_iter+0x1a7/0x7e0
[   59.262598]  ? rcu_pm_notify+0xc0/0xc0
[   59.266465]  ? skb_kill_datagram+0x120/0x120
[   59.270856]  ? skb_copy_datagram_iter+0x10d/0x4a0
[   59.275679]  ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20
[   59.281199]  ? ip6_datagram_recv_common_ctl+0x35a/0x5c0
[   59.286543]  ? ipv6_recv_rxpmtu+0x920/0x920
[   59.290846]  ? __might_fault+0x12b/0x1e0
[   59.294892]  ? lock_downgrade+0x900/0x900
[   59.299024]  ip6_datagram_recv_ctl+0x33/0x40
[   59.303424]  rawv6_recvmsg+0xc4b/0xea0
[   59.307298]  ? rawv6_rcv_skb+0x480/0x480
[   59.311358]  sock_common_recvmsg+0x13a/0x2a0
[   59.315752]  ? compat_sock_common_getsockopt+0x150/0x150
[   59.321193]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   59.326717]  ? security_socket_recvmsg+0x9c/0xc0
[   59.331458]  ? compat_sock_common_getsockopt+0x150/0x150
[   59.336894]  sock_recvmsg+0xd0/0x110
[   59.340588]  ? __sock_recv_ts_and_drops+0x420/0x420
[   59.345587]  ___sys_recvmsg+0x2b6/0x680
[   59.349547]  ? ___sys_sendmsg+0x930/0x930
[   59.353681]  ? release_sock+0x1ec/0x2c0
[   59.357641]  ? __local_bh_enable_ip+0x160/0x260
[   59.362296]  ? __fget_light+0x2e9/0x430
[   59.366274]  ? fget_raw+0x20/0x20
[   59.369723]  ? __local_bh_enable_ip+0x160/0x260
[   59.374383]  ? ip6_datagram_connect+0x3a/0x50
[   59.378863]  ? ip6_datagram_connect_v6_only+0x71/0x90
[   59.384069]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   59.389590]  ? sockfd_lookup_light+0xc5/0x160
[   59.394083]  __sys_recvmsg+0x11a/0x280
[   59.397968]  ? __ia32_sys_sendmmsg+0x100/0x100
[   59.402541]  ? __x64_sys_futex+0x476/0x690
[   59.406781]  ? do_syscall_64+0x9a/0x820
[   59.410743]  ? do_syscall_64+0x9a/0x820
[   59.414704]  ? __bpf_trace_preemptirq_template+0x30/0x30
[   59.420150]  ? trace_hardirqs_off+0xb8/0x310
[   59.424543]  __x64_sys_recvmsg+0x78/0xb0
[   59.428592]  do_syscall_64+0x1b9/0x820
[   59.432468]  ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[   59.437817]  ? syscall_return_slowpath+0x5e0/0x5e0
[   59.442737]  ? trace_hardirqs_on_caller+0x310/0x310
[   59.447754]  ? prepare_exit_to_usermode+0x3b0/0x3b0
[   59.452775]  ? recalc_sigpending_tsk+0x180/0x180
[   59.457515]  ? __switch_to_asm+0x40/0x70
[   59.461585]  ? __switch_to_asm+0x34/0x70
[   59.465632]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   59.470462]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   59.475743] RIP: 0033:0x4458d9
[   59.478938] Code: e8 9c bb 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 cb 11 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   59.497825] RSP: 002b:00007f8d9044eda8 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
[   59.505519] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 00000000004458d9
[   59.512769] RDX: 0000000000000002 RSI: 0000000020000140 RDI: 0000000000000004
[   59.520019] RBP: 00000000006dbc30 R08: 0000000000000000 R09: 0000000000000000
[   59.527275] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc3c
[   59.534524] R13: 0100000000000000 R14: 00007f8d9044f9c0 R15: 00000000006dbd2c
[   59.541777] Modules linked in:
[   59.545447] ---[ end trace a1ff1ede1cc60628 ]---
[   59.550211] RIP: 0010:pskb_expand_head+0xc24/0x10d0
[   59.555274] 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
[   59.574195] RSP: 0018:ffff8880920cf190 EFLAGS: 00010293
[   59.579543] RAX: ffff8880902f06c0 RBX: ffff88809ce31b80 RCX: ffffffff861ad06a
[   59.587097] RDX: 0000000000000000 RSI: ffffffff861adae4 RDI: 0000000000000005
[   59.594420] RBP: ffff8880920cf390 R08: ffff8880902f06c0 R09: ffffed10139c638a
[   59.601711] R10: ffffed10139c638a R11: ffff88809ce31c57 R12: ffff88809ce31c3c
[   59.608965] R13: 0000000000000002 R14: dffffc0000000000 R15: 0000000000000000
[   59.616266] FS:  00007f8d9044f700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
[   59.624508] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   59.630372] CR2: 00007f8d9044ee78 CR3: 00000000a5c47000 CR4: 00000000001406f0
[   59.637659] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   59.644942] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   59.652225] Kernel panic - not syncing: Fatal exception
[   59.658447] Kernel Offset: disabled
[   59.662064] Rebooting in 86400 seconds..