[ 20.964907] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 21.200880] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.425095] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.341419] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) [ 22.520202] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) Warning: Permanently added '10.128.0.10' (ECDSA) to the list of known hosts. [ 27.940516] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 [ 28.048017] IPVS: Creating netns size=2552 id=1 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists RTNETLINK answers: File exists RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" [ 29.153909] ------------[ cut here ]------------ [ 29.158674] kernel BUG at include/linux/skbuff.h:1824! [ 29.163925] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 29.169725] Dumping ftrace buffer: [ 29.173231] (ftrace buffer empty) [ 29.176908] Modules linked in: [ 29.180186] CPU: 1 PID: 3788 Comm: syzkaller705022 Not tainted 4.4.118-g239a415 #25 [ 29.187947] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.197271] task: ffff8800ab2cc800 task.stack: ffff8800ab4c8000 [ 29.203299] RIP: 0010:[] [] __ip6_make_skb+0x120b/0x1c30 [ 29.212051] RSP: 0018:ffff8800ab4cf530 EFLAGS: 00010293 [ 29.217465] RAX: ffff8800ab2cc800 RBX: 00000000000006e0 RCX: ffffffff8330db4b [ 29.224704] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801cdb38b10 [ 29.231945] RBP: ffff8800ab4cf730 R08: ffff8800ac1d5938 R09: 0000000000000000 [ 29.239182] R10: 0000000000000599 R11: fd676b049aac0ae7 R12: 00000000000005a1 [ 29.246420] R13: ffff8800ac1d58c0 R14: ffff8800ac1d593c R15: ffff8801cdb38640 [ 29.253657] FS: 0000000001352880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.261850] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.267697] CR2: 0000000020000280 CR3: 00000000ac4fa000 CR4: 0000000000160670 [ 29.274937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.282177] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.289412] Stack: [ 29.291531] 0000059900000118 ffff8800ac1d597c ffff8800ac1d5990 ffff8800ac1d5988 [ 29.299492] ffff8801d80dc1c8 1ffff10015699eb8 ffff8801cc3eb340 ffff8800b013aa20 [ 29.307454] ffff8801cdb38652 ffff8801cdb38b60 ffff8800bbb58000 ffff8800ac1d5948 [ 29.315417] Call Trace: [ 29.317973] [] ? ip6_output+0x520/0x520 [ 29.323568] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 29.330548] [] ? ip6_setup_cork+0x11a0/0x11a0 [ 29.336663] [] udp_v6_push_pending_frames+0x20a/0x340 [ 29.343469] [] ? udpv6_destroy_sock+0xd0/0xd0 [ 29.349584] [] ? ip_reply_glue_bits+0xc0/0xc0 [ 29.355700] [] udpv6_sendmsg+0x1f12/0x2500 [ 29.361551] [] ? ip_reply_glue_bits+0xc0/0xc0 [ 29.367664] [] ? udp6_lib_lookup+0x60/0x60 [ 29.373520] [] ? avc_has_perm_noaudit+0x460/0x460 [ 29.379980] [] ? sock_has_perm+0x1c1/0x400 [ 29.385829] [] ? sock_has_perm+0x29f/0x400 [ 29.391679] [] ? sock_has_perm+0x9f/0x400 [ 29.397445] [] ? inet_sendmsg+0x201/0x4c0 [ 29.403213] [] inet_sendmsg+0x2bc/0x4c0 [ 29.408804] [] ? inet_sendmsg+0x73/0x4c0 [ 29.414479] [] ? inet_recvmsg+0x4c0/0x4c0 [ 29.420257] [] sock_sendmsg+0xca/0x110 [ 29.425764] [] ___sys_sendmsg+0x6c1/0x7c0 [ 29.431538] [] ? prandom_u32_state+0x13/0x180 [ 29.437652] [] ? copy_msghdr_from_user+0x550/0x550 [ 29.444213] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 29.450501] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.457310] [] ? release_sock+0x3be/0x510 [ 29.463075] [] ? trace_hardirqs_on+0xd/0x10 [ 29.469014] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 29.475301] [] ? _raw_spin_unlock_bh+0x30/0x40 [ 29.481503] [] ? release_sock+0x3be/0x510 [ 29.487270] [] ? trace_hardirqs_on+0xd/0x10 [ 29.493209] [] ? __local_bh_enable_ip+0x6a/0xd0 [ 29.499497] [] ? lock_sock_nested+0xdc/0x120 [ 29.505526] [] ? ip6_datagram_connect+0x3a/0x50 [ 29.511813] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 29.518922] [] ? __fget_light+0xa3/0x1e0 [ 29.524603] [] ? __fdget+0x18/0x20 [ 29.529766] [] __sys_sendmsg+0xd3/0x190 [ 29.535358] [] ? SyS_shutdown+0x1b0/0x1b0 [ 29.541124] [] ? vmacache_update+0xfe/0x130 [ 29.547062] [] ? __do_page_fault+0x380/0xa00 [ 29.553088] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 29.559894] [] SyS_sendmsg+0x2d/0x50 [ 29.565225] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.571768] Code: 08 84 c9 0f 85 c0 08 00 00 41 3b 45 7c 72 17 e8 dc 31 05 fe 45 89 e6 4d 01 f7 4d 89 bd d0 00 00 00 e9 17 f2 ff ff e8 c5 31 05 fe <0f> 0b e8 be 31 05 fe 48 8b 7c 24 50 e8 34 d2 fe ff 41 89 c4 e9 [ 29.598269] RIP [] __ip6_make_skb+0x120b/0x1c30 executing program [ 29.604674] RSP [ 29.611824] ---[ end trace 7880747ca118f920 ]--- [ 29.616569] Kernel panic - not syncing: Fatal exception [ 29.622313] Dumping ftrace buffer: [ 29.625828] (ftrace buffer empty) [ 29.629509] Kernel Offset: disabled [ 29.633103] Rebooting in 86400 seconds..