[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.377858] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.980219] random: sshd: uninitialized urandom read (32 bytes read) [ 16.155054] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.586092] random: sshd: uninitialized urandom read (32 bytes read) [ 18.559206] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.32' (ECDSA) to the list of known hosts. [ 24.030532] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.197680] ------------[ cut here ]------------ [ 26.202459] kernel BUG at net/core/skbuff.c:1208! [ 26.207278] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 26.212618] Dumping ftrace buffer: [ 26.216133] (ftrace buffer empty) [ 26.219896] Modules linked in: [ 26.223201] CPU: 1 PID: 5374 Comm: syz-executor926 Not tainted 4.9.118-g47b77b8 #20 [ 26.231019] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.240490] task: ffff8801d7001800 task.stack: ffff8801d7080000 [ 26.246522] RIP: 0010:[] [] pskb_expand_head+0x86c/0x930 [ 26.255527] RSP: 0018:ffff8801d70877a8 EFLAGS: 00010293 [ 26.260956] RAX: ffff8801d7001800 RBX: ffff8801d908d780 RCX: 0000000002080020 [ 26.268207] RDX: 0000000000000000 RSI: ffffffff8303e95c RDI: ffff8801d908d85c [ 26.275451] RBP: ffff8801d7087820 R08: 0000000000000001 R09: ffffed003ae18000 [ 26.282700] R10: ffffed003ae18000 R11: ffff8801d70c0003 R12: 00000000000000c0 [ 26.289947] R13: ffff8801d908d844 R14: ffff8801b7888fc0 R15: 0000000002080020 [ 26.297194] FS: 00007f69d6d9a700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.305395] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.311258] CR2: 00007f69d6d78e78 CR3: 00000001d7b8b000 CR4: 00000000001606f0 [ 26.318602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.325854] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.333105] Stack: [ 26.335239] ffff8801d70020c8 1ffff1003ae10ef8 ffffffff8556c0e8 0000000041b58ab3 [ 26.343238] ffffffff843c4868 ffffffff81236190 ffff8801d70877e8 0000000000000286 [ 26.351532] ffff8801d7087808 ffffffff00000000 0000000000000000 ffff8801d908d780 [ 26.359604] Call Trace: [ 26.362177] [] ? debug_check_no_locks_freed+0x210/0x210 [ 26.369346] [] __pskb_pull_tail+0xc8/0x1250 [ 26.375376] [] ip6_datagram_recv_specific_ctl+0x135f/0x15b0 [ 26.382725] [] ? check_stack_object+0x110/0x150 [ 26.389042] [] ? ip6_datagram_recv_common_ctl+0x3a0/0x3a0 [ 26.396314] [] ? copy_page_to_iter+0x2ca/0xb10 [ 26.402525] [] ? ip6_datagram_recv_common_ctl+0x275/0x3a0 [ 26.409693] [] ? ipv6_recv_rxpmtu+0x780/0x780 [ 26.415819] [] ? skb_copy_datagram_iter+0x1ac/0x8f0 [ 26.422461] [] ip6_datagram_recv_ctl+0x33/0x40 [ 26.428671] [] rawv6_recvmsg+0x926/0xac0 [ 26.434402] [] ? rawv6_rcv_skb+0x300/0x300 [ 26.440266] [] ? __fget+0x20a/0x3b0 [ 26.445519] [] sock_common_recvmsg+0x112/0x1e0 [ 26.451731] [] ? compat_sock_common_getsockopt+0x150/0x150 [ 26.458980] [] ? selinux_socket_recvmsg+0x3f/0x50 [ 26.465448] [] ? security_socket_recvmsg+0x97/0xc0 [ 26.472000] [] ? compat_sock_common_getsockopt+0x150/0x150 [ 26.479246] [] sock_recvmsg+0xc6/0x110 [ 26.484756] [] SYSC_recvfrom+0x1fc/0x350 [ 26.490440] [] ? kernel_recvmsg+0x120/0x120 [ 26.496400] [] ? __fget+0x47/0x3b0 [ 26.501600] [] ? check_preemption_disabled+0x3b/0x170 [ 26.508425] [] ? __fget_light+0x169/0x1f0 [ 26.514204] [] ? __fdget+0x18/0x20 [ 26.519370] [] ? sockfd_lookup_light+0xb6/0x160 [ 26.525663] [] ? SyS_futex+0x206/0x310 [ 26.531172] [] ? fd_install+0x4d/0x60 [ 26.536594] [] ? do_futex+0x17c0/0x17c0 [ 26.542191] [] ? move_addr_to_kernel+0x50/0x50 [ 26.548394] [] SyS_recvfrom+0x40/0x50 [ 26.553818] [] ? SyS_send+0x40/0x40 [ 26.559071] [] do_syscall_64+0x1a6/0x490 [ 26.564755] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.571651] Code: e8 6a d5 4f fe e9 9b fc ff ff 48 8b 7d c0 e8 5c d5 4f fe e9 91 fd ff ff 48 8b 7d c0 e8 4e d5 4f fe e9 19 fc ff ff e8 54 01 32 fe <0f> 0b 48 8b 7d c0 89 55 a8 e8 36 d5 4f fe 8b 55 a8 e9 1a f9 ff [ 26.598599] RIP [] pskb_expand_head+0x86c/0x930 [ 26.605015] RSP [ 26.608966] ---[ end trace 1e662d40f7140fa2 ]--- [ 26.613716] Kernel panic - not syncing: Fatal exception [ 26.619524] Dumping ftrace buffer: [ 26.623049] (ftrace buffer empty) [ 26.626754] Kernel Offset: disabled [ 26.630364] Rebooting in 86400 seconds..