[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.837519] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.488221] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 25.875771] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 26.804725] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) [ 28.420072] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.0.28' (ECDSA) to the list of known hosts. [ 34.011790] random: sshd: uninitialized urandom read (32 bytes read, 123 bits of entropy available) executing program [ 34.118869] kasan: CONFIG_KASAN_INLINE enabled [ 34.123307] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 34.136126] Dumping ftrace buffer: [ 34.139633] (ftrace buffer empty) [ 34.143310] Modules linked in: [ 34.146585] CPU: 0 PID: 3784 Comm: syzkaller121451 Not tainted 4.4.120-gd63fdf6 #28 [ 34.154359] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.163683] task: ffff8800b6320000 task.stack: ffff8801d93d8000 [ 34.169706] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 34.178652] RSP: 0018:ffff8801d93df928 EFLAGS: 00010206 [ 34.184067] RAX: dffffc0000000000 RBX: ffff8801d9770000 RCX: ffffffff831aa228 [ 34.191305] RDX: 000000000000000c RSI: ffff8801cdd84c80 RDI: 0000000000000060 [ 34.198544] RBP: ffff8801d93df968 R08: 0000000000000001 R09: 0000000000000001 [ 34.205783] R10: 0000000000000000 R11: 1ffff1003b27bef6 R12: ffff8801cdd84c80 [ 34.213020] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801cdd84cd8 [ 34.220259] FS: 000000000156f880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.228453] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.234315] CR2: 000000002082dff0 CR3: 00000001c9f34000 CR4: 0000000000160670 [ 34.241566] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.248808] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.256047] Stack: [ 34.258162] ffff8801d9770088 ffff880100000001 ffff8801d9770088 dffffc0000000000 [ 34.266136] ffff8801d9770000 0000000000000000 ffffed003b2ee086 ffff8801cdd84c80 [ 34.274121] ffff8801d93df9d8 ffffffff82df8cb6 ffff8801d9770188 ffff8801d9770190 [ 34.282086] Call Trace: [ 34.284643] [] release_sock+0x176/0x510 [ 34.290236] [] udp_sendmsg+0x15c4/0x1c30 [ 34.295916] [] ? avc_has_perm_noaudit+0x460/0x460 [ 34.302377] [] ? udp_push_pending_frames+0xe0/0xe0 [ 34.308924] [] ? udp_seq_next+0x80/0x80 [ 34.314526] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 34.321506] [] ? sock_has_perm+0x1c1/0x400 [ 34.327357] [] ? sock_has_perm+0x29f/0x400 [ 34.333208] [] ? sock_has_perm+0x9f/0x400 [ 34.338974] [] ? inet_sendmsg+0x201/0x4c0 [ 34.344740] [] inet_sendmsg+0x2bc/0x4c0 [ 34.350330] [] ? inet_sendmsg+0x73/0x4c0 [ 34.356007] [] ? inet_recvmsg+0x4c0/0x4c0 [ 34.361776] [] sock_sendmsg+0xca/0x110 [ 34.367279] [] SYSC_sendto+0x2c8/0x340 [ 34.372784] [] ? SYSC_connect+0x310/0x310 [ 34.378550] [] ? _raw_spin_unlock+0x2c/0x50 [ 34.384493] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 34.391475] [] ? handle_mm_fault+0x3f2/0x3190 [ 34.397586] [] ? SYSC_bind+0x1ad/0x280 [ 34.403093] [] ? __do_page_fault+0x380/0xa00 [ 34.409117] [] ? retint_user+0x18/0x3c [ 34.414622] [] SyS_sendto+0x40/0x50 [ 34.419865] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.426409] 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 [ 34.453012] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 34.459593] RSP [ 34.463232] ---[ end trace 35042e715da273cb ]--- [ 34.467975] Kernel panic - not syncing: Fatal exception in interrupt [ 34.474894] Dumping ftrace buffer: [ 34.478406] (ftrace buffer empty) [ 34.482085] Kernel Offset: disabled [ 34.485679] Rebooting in 86400 seconds..