[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [ 10.410879] random: sshd: uninitialized urandom read (32 bytes read) [....] 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: [ 25.764789] random: sshd: uninitialized urandom read (32 bytes read) [ 25.790017] random: crng init done Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. executing program [ 32.312313] ------------[ cut here ]------------ [ 32.317096] kernel BUG at net/core/skbuff.c:1208! [ 32.321915] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 32.327281] Modules linked in: [ 32.330574] CPU: 1 PID: 2056 Comm: syz-executor722 Not tainted 4.9.148+ #3 [ 32.337560] task: ffff8801cfec8000 task.stack: ffff8801d6ed8000 [ 32.343591] RIP: 0010:[] [] pskb_expand_head+0x842/0x8b0 [ 32.352357] RSP: 0018:ffff8801d6edf880 EFLAGS: 00010293 [ 32.357779] RAX: ffff8801cfec8000 RBX: ffff8801d2911640 RCX: 0000000002080020 [ 32.365023] RDX: 0000000000000000 RSI: ffffffff822c4b22 RDI: ffff8801d291171c [ 32.372269] RBP: ffff8801d6edf8f8 R08: 0000000000000018 R09: 0000000000000000 [ 32.379516] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000002080020 [ 32.386761] R13: ffff8801d2911704 R14: 0000000000000000 R15: 00000000000000c0 [ 32.394003] FS: 00007f8e88ec2700(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 32.402264] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.408128] CR2: 0000000020000300 CR3: 00000001ce888000 CR4: 00000000001606b0 [ 32.415379] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.422620] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.429877] Stack: [ 32.432000] 0000000000000000 ffffffff822d7d80 ffff8801cfec88a8 ffff8801cfec8000 [ 32.440110] ffffffff82812a9a ffff8801d29116c6 0000000000000000 0000000000000004 [ 32.448112] ffff8801d6edf8e0 0000000081207265 ffff8801ced1f680 0000000000000040 [ 32.456124] Call Trace: [ 32.458691] [] ? __skb_try_recv_datagram+0x100/0x890 [ 32.465421] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 32.472343] [] __pskb_pull_tail+0xc8/0xf50 [ 32.478215] [] ip6_datagram_recv_specific_ctl+0x1396/0x1580 [ 32.485549] [] ? __skb_recv_datagram+0x19b/0x200 [ 32.491929] [] ? ip6_datagram_recv_common_ctl+0x3c0/0x3c0 [ 32.499090] [] ? check_preemption_disabled+0x3c/0x200 [ 32.505901] [] ? check_preemption_disabled+0x3c/0x200 [ 32.512715] [] ? copy_page_to_iter+0x2da/0xb30 [ 32.518918] [] ? ip6_datagram_recv_common_ctl+0x283/0x3c0 [ 32.526079] [] ? ipv6_recv_rxpmtu+0x790/0x790 [ 32.532199] [] ? skb_copy_datagram_iter+0x33f/0x8f0 [ 32.538836] [] ? check_preemption_disabled+0x3c/0x200 [ 32.545705] [] ip6_datagram_recv_ctl+0x34/0x40 [ 32.551919] [] rawv6_recvmsg+0x8da/0xac0 [ 32.557605] [] ? rawv6_bind+0x7b0/0x7b0 [ 32.563202] [] sock_common_recvmsg+0x110/0x200 [ 32.569415] [] ? compat_sock_common_getsockopt+0x150/0x150 [ 32.576667] [] ? selinux_socket_recvmsg+0x3f/0x50 [ 32.583130] [] ? security_socket_recvmsg+0x97/0xc0 [ 32.589682] [] ? compat_sock_common_getsockopt+0x150/0x150 [ 32.596928] [] sock_recvmsg+0xc8/0x110 [ 32.602437] [] SyS_recvfrom+0x1f0/0x350 [ 32.608038] [] ? SyS_send+0x40/0x40 [ 32.613286] [] ? sockfd_lookup_light+0xb4/0x160 [ 32.619580] [] ? SyS_futex+0x25f/0x360 [ 32.625090] [] ? do_futex+0x1a70/0x1a70 [ 32.630689] [] ? _raw_spin_unlock_irq+0x28/0x60 [ 32.636982] [] ? trace_hardirqs_on_caller+0x385/0x5a0 [ 32.643793] [] ? do_syscall_64+0x4a/0x570 [ 32.649565] [] ? SyS_send+0x40/0x40 [ 32.654840] [] do_syscall_64+0x1ad/0x570 [ 32.660525] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.667421] Code: ff 48 8b 7d a0 e8 0f fa 22 ff e9 65 fb ff ff 4c 89 ff e8 02 fa 22 ff e9 25 fe ff ff e8 f8 f9 22 ff e9 95 fc ff ff e8 0e 68 05 ff <0f> 0b 48 8b 7d a0 e8 e3 f9 22 ff e9 09 f9 ff ff 48 8b 7d a0 e8 [ 32.694491] RIP [] pskb_expand_head+0x842/0x8b0 [ 32.700900] RSP [ 32.704825] ---[ end trace 027b6d34850535ab ]--- [ 32.709564] Kernel panic - not syncing: Fatal exception [ 32.715218] Kernel Offset: disabled [ 32.718820] Rebooting in 86400 seconds..