[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.648787] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.840443] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.205922] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.899897] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) [ 23.048340] random: sshd: uninitialized urandom read (32 bytes read, 82 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 28.463188] random: sshd: uninitialized urandom read (32 bytes read, 88 bits of entropy available) executing program [ 28.550295] ------------[ cut here ]------------ [ 28.555056] kernel BUG at include/linux/skbuff.h:1824! [ 28.560299] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 28.566090] Dumping ftrace buffer: [ 28.569595] (ftrace buffer empty) [ 28.573276] Modules linked in: [ 28.576553] CPU: 1 PID: 3755 Comm: syzkaller217255 Not tainted 4.4.116-g17c7c49 #17 [ 28.584312] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.593634] task: ffff8800ac0a3000 task.stack: ffff8801d8ce0000 [ 28.599655] RIP: 0010:[] [] __ip6_make_skb+0x120b/0x1c30 [ 28.608411] RSP: 0018:ffff8801d8ce7440 EFLAGS: 00010293 [ 28.613825] RAX: ffff8800ac0a3000 RBX: 0000000000000738 RCX: ffffffff8330e5eb [ 28.621062] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8800bb0104d0 [ 28.628299] RBP: ffff8801d8ce7640 R08: ffff8801c68a1e38 R09: 0000000000000000 [ 28.635536] R10: 0000000000001100 R11: 1ffff1003b19ce50 R12: 00000000000000d6 [ 28.642775] R13: ffff8801c68a1dc0 R14: ffff8801c68a1e3c R15: ffff8800bb010000 [ 28.650015] FS: 0000000001b44880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.658209] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.664057] CR2: 000000002000b000 CR3: 00000001cd352000 CR4: 0000000000160670 [ 28.671302] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.678547] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.685795] Stack: [ 28.687914] ffff8801d8ce74b0 ffff8801c68a1e7c ffff8801c68a1e90 ffff8801c68a1e88 [ 28.695922] ffff8801d966f4c8 1ffff1003b19ce9a ffff8800b4a6c380 ffff8801d01a73c0 [ 28.703881] ffff8800bb010012 ffff8800bb010520 ffffffff846effc0 ffff8801c68a1e48 [ 28.711845] Call Trace: [ 28.714401] [] ? ip6_output+0x520/0x520 [ 28.719994] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.726973] [] ? ip6_setup_cork+0x11a0/0x11a0 [ 28.733087] [] udp_v6_push_pending_frames+0x20a/0x340 [ 28.739899] [] ? udpv6_destroy_sock+0xd0/0xd0 [ 28.746010] [] ? __udpv6_queue_rcv_skb+0x470/0x470 [ 28.752554] [] udpv6_sendmsg+0x1f12/0x2500 [ 28.758406] [] ? __udpv6_queue_rcv_skb+0x470/0x470 [ 28.764950] [] ? udp6_lib_lookup+0x60/0x60 [ 28.770813] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.777284] [] ? sock_has_perm+0x1c1/0x400 [ 28.783144] [] ? sock_has_perm+0x29f/0x400 [ 28.789005] [] ? sock_has_perm+0x9f/0x400 [ 28.794772] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 28.801842] [] ? inet_sendmsg+0x73/0x4c0 [ 28.807518] [] ? inet_sendmsg+0x201/0x4c0 [ 28.813291] [] inet_sendmsg+0x2bc/0x4c0 [ 28.818891] [] ? inet_sendmsg+0x73/0x4c0 [ 28.824582] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.830364] [] sock_sendmsg+0xca/0x110 [ 28.835883] [] ___sys_sendmsg+0x312/0x7c0 [ 28.841656] [] ? trace_hardirqs_on+0xd/0x10 [ 28.847614] [] ? copy_msghdr_from_user+0x550/0x550 [ 28.854172] [] ? kasan_slab_free+0x88/0xc0 [ 28.860023] [] ? kfree+0xfc/0x300 [ 28.865097] [] ? ___sys_sendmsg+0x14c/0x7c0 [ 28.871034] [] ? copy_msghdr_from_user+0x550/0x550 [ 28.877579] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.884559] [] ? check_preemption_disabled+0x3b/0x200 [ 28.891366] [] ? check_preemption_disabled+0x3b/0x200 [ 28.898174] [] ? __fget_light+0xa1/0x1e0 [ 28.903853] [] ? __fdget+0x18/0x20 [ 28.909666] [] ? sockfd_lookup_light+0x118/0x160 [ 28.916041] [] __sys_sendmmsg+0x11c/0x2e0 [ 28.921806] [] ? SyS_sendmsg+0x50/0x50 [ 28.927310] [] ? __fget_light+0xa1/0x1e0 [ 28.932993] [] ? __fdget+0x18/0x20 [ 28.938158] [] ? __do_page_fault+0x290/0xa00 [ 28.944183] [] ? __do_page_fault+0x380/0xa00 [ 28.950214] [] ? move_addr_to_kernel+0x50/0x50 [ 28.956421] [] SyS_sendmmsg+0x35/0x60 [ 28.961862] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.968417] Code: 08 84 c9 0f 85 c0 08 00 00 41 3b 45 7c 72 17 e8 8c 27 05 fe 45 89 e6 4d 01 f7 4d 89 bd d0 00 00 00 e9 17 f2 ff ff e8 75 27 05 fe <0f> 0b e8 6e 27 05 fe 48 8b 7c 24 50 e8 34 d2 fe ff 41 89 c4 e9 [ 28.995073] RIP [] __ip6_make_skb+0x120b/0x1c30 [ 29.001488] RSP [ 29.020235] ---[ end trace 93cb25f79fde2ede ]--- [ 29.025002] Kernel panic - not syncing: Fatal exception [ 29.030816] Dumping ftrace buffer: [ 29.030820] (ftrace buffer empty) [ 29.030822] Kernel Offset: disabled [ 29.041597] Rebooting in 86400 seconds..