[ 19.992674] random: sshd: uninitialized urandom read (32 bytes read, 33 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. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.660349] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.864024] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.886542] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) [ 23.059660] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) Warning: Permanently added '10.128.0.2' (ECDSA) to the list of known hosts. [ 28.456768] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program [ 28.564788] kasan: CONFIG_KASAN_INLINE enabled [ 28.569199] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.582008] Dumping ftrace buffer: [ 28.585513] (ftrace buffer empty) [ 28.589191] Modules linked in: [ 28.592467] CPU: 0 PID: 3700 Comm: syzkaller082837 Not tainted 4.4.120-gd63fdf6 #28 [ 28.600225] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.609548] task: ffff8800b0723000 task.stack: ffff8801c9428000 [ 28.615574] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 28.624502] RSP: 0018:ffff8801c942f928 EFLAGS: 00010206 [ 28.629917] RAX: dffffc0000000000 RBX: ffff8800bba58000 RCX: ffffffff831aa228 [ 28.637154] RDX: 000000000000000c RSI: ffff8801c9386b40 RDI: 0000000000000060 [ 28.644391] RBP: ffff8801c942f968 R08: 0000000000000001 R09: 0000000000000001 [ 28.651627] R10: 0000000000000000 R11: 1ffff10039285ef6 R12: ffff8801c9386b40 [ 28.658866] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801c9386b98 [ 28.666125] FS: 0000000001718880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.674316] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.680164] CR2: 0000000020df9ff0 CR3: 00000001ce9d0000 CR4: 0000000000160670 [ 28.687404] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.694639] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.701873] Stack: [ 28.703986] ffff8800bba58088 ffff880000000001 ffff8800bba58088 dffffc0000000000 [ 28.711948] ffff8800bba58000 0000000000000000 ffffed001774b086 ffff8801c9386b40 [ 28.719906] ffff8801c942f9d8 ffffffff82df8cb6 ffff8800bba58188 ffff8800bba58190 [ 28.727866] Call Trace: [ 28.730423] [] release_sock+0x176/0x510 [ 28.736015] [] udp_sendmsg+0x15c4/0x1c30 [ 28.741692] [] ? avc_has_perm_noaudit+0x460/0x460 [ 28.748151] [] ? udp_push_pending_frames+0xe0/0xe0 [ 28.754695] [] ? udp_seq_next+0x80/0x80 [ 28.760289] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.767269] [] ? sock_has_perm+0x1c1/0x400 [ 28.773118] [] ? sock_has_perm+0x29f/0x400 [ 28.778967] [] ? sock_has_perm+0x9f/0x400 [ 28.784730] [] ? inet_sendmsg+0x201/0x4c0 [ 28.790492] [] inet_sendmsg+0x2bc/0x4c0 [ 28.796082] [] ? inet_sendmsg+0x73/0x4c0 [ 28.801760] [] ? inet_recvmsg+0x4c0/0x4c0 [ 28.807527] [] sock_sendmsg+0xca/0x110 [ 28.813032] [] SYSC_sendto+0x2c8/0x340 [ 28.818532] [] ? SYSC_connect+0x310/0x310 [ 28.824296] [] ? _raw_spin_unlock+0x2c/0x50 [ 28.830234] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 28.837215] [] ? handle_mm_fault+0x3f2/0x3190 [ 28.843330] [] ? SYSC_bind+0x1ad/0x280 [ 28.848835] [] ? __do_page_fault+0x380/0xa00 [ 28.854859] [] ? retint_user+0x18/0x3c [ 28.860363] [] SyS_sendto+0x40/0x50 [ 28.865608] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 28.872148] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 28 6b 1b fe 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 9f 0b 00 00 41 f6 46 60 04 [ 28.898572] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 28.905151] RSP [ 28.908800] ---[ end trace 2a0efa0f9113df12 ]--- [ 28.913553] Kernel panic - not syncing: Fatal exception in interrupt [ 28.920547] Dumping ftrace buffer: [ 28.924061] (ftrace buffer empty) [ 28.927738] Kernel Offset: disabled [ 28.931333] Rebooting in 86400 seconds..