[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.104393] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 21.520391] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.809496] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.894406] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 23.058888] random: sshd: uninitialized urandom read (32 bytes read, 122 bits of entropy available) Warning: Permanently added '10.128.0.58' (ECDSA) to the list of known hosts. [ 28.466837] random: nonblocking pool is initialized executing program [ 28.569340] kasan: CONFIG_KASAN_INLINE enabled [ 28.573763] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.586604] Dumping ftrace buffer: [ 28.590114] (ftrace buffer empty) [ 28.593793] Modules linked in: [ 28.597083] CPU: 1 PID: 3826 Comm: syz-executor143 Not tainted 4.4.129-g23eaecc #27 [ 28.604845] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.614169] task: ffff8801d8c2e000 task.stack: ffff8800bb350000 [ 28.620197] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 28.629308] RSP: 0018:ffff8800bb3577e0 EFLAGS: 00010206 [ 28.634728] RAX: dffffc0000000000 RBX: ffff8801da3e8000 RCX: 0000000000000000 [ 28.641968] RDX: 000000000000000c RSI: ffffffff834961d6 RDI: 0000000000000060 [ 28.649208] RBP: ffff8800bb357820 R08: 0000000000000001 R09: 0000000000000001 [ 28.656456] R10: 0000000000000000 R11: ffff8801d8c2e000 R12: ffff8800ad2878c0 [ 28.663717] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800ad287918 [ 28.670966] FS: 0000000001a0d880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.679164] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.685017] CR2: 0000000020f9bff0 CR3: 00000000b0f8d000 CR4: 00000000001606f0 [ 28.692259] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.699501] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.706739] Stack: [ 28.708859] 00000001da3e8088 ffff8800ad2878c0 ffff8801da3e8088 ffff8801da3e8000 [ 28.716849] ffff8800ad2878c0 dffffc0000000000 ffff8800ad287918 0000000000000000 [ 28.724820] ffff8800bb357890 ffffffff82f298fb ffff8801da3e8430 ffff8801da3e8188 [ 28.732814] Call Trace: [ 28.735378] [] release_sock+0x17b/0x500 [ 28.740981] [] udpv6_sendmsg+0x917/0x24c0 [ 28.746752] [] ? __udpv6_queue_rcv_skb+0x480/0x480 [ 28.753300] [] ? udp6_lib_lookup2+0x990/0x990 [ 28.759417] [] ? debug_check_no_locks_freed+0x210/0x210 [ 28.766404] [] ? sock_has_perm+0x1c1/0x400 [ 28.772261] [] ? sock_has_perm+0x29f/0x400 [ 28.778116] [] ? sock_has_perm+0x9f/0x400 [ 28.783886] [] ? inet_sendmsg+0x143/0x4d0 [ 28.789657] [] inet_sendmsg+0x203/0x4d0 [ 28.795250] [] ? inet_sendmsg+0x73/0x4d0 [ 28.800927] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.806699] [] sock_sendmsg+0xcc/0x110 [ 28.812204] [] sock_write_iter+0x223/0x3b0 [ 28.818058] [] ? sock_sendmsg+0x110/0x110 [ 28.823829] [] ? debug_check_no_obj_freed+0x2ec/0x940 [ 28.830638] [] ? iov_iter_init+0xaf/0x1d0 [ 28.836409] [] __vfs_write+0x30d/0x3f0 [ 28.841918] [] ? __vfs_read+0x3e0/0x3e0 [ 28.847521] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 28.854242] [] ? __fget_light+0x9f/0x1f0 [ 28.859925] [] ? selinux_file_permission+0x2f2/0x450 [ 28.866658] [] ? rw_verify_area+0x100/0x300 [ 28.872615] [] vfs_write+0x191/0x4e0 [ 28.877951] [] SyS_write+0xd9/0x1c0 [ 28.883202] [] ? SyS_read+0x1c0/0x1c0 [ 28.888628] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.895095] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.901641] Code: 74 24 58 41 f6 c6 01 0f 85 e2 07 00 00 e8 0a b0 eb fd 49 83 e6 fe 48 b8 00 00 00 00 00 fc ff df 49 8d 7e 60 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 01 0f 8e c1 0d 00 00 41 f6 46 60 04 [ 28.928287] RIP [] udpv6_queue_rcv_skb+0x18f/0x1500 [ 28.935056] RSP [ 28.938725] ---[ end trace 3e76207b4c887a78 ]--- [ 28.943464] Kernel panic - not syncing: Fatal exception in interrupt [ 28.950522] Dumping ftrace buffer: [ 28.954037] (ftrace buffer empty) [ 28.957719] Kernel Offset: disabled [ 28.961318] Rebooting in 86400 seconds..