[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.706510] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.117532] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.564571] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.569263] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program [ 32.347646] kasan: CONFIG_KASAN_INLINE enabled [ 32.352128] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 32.365013] Dumping ftrace buffer: [ 32.368534] (ftrace buffer empty) [ 32.372230] Modules linked in: [ 32.375520] CPU: 1 PID: 3841 Comm: syz-executor808 Not tainted 4.4.128-gbd23e3a #20 [ 32.383290] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.392641] task: ffff8800ad42c800 task.stack: ffff8800acd48000 [ 32.398681] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1570 [ 32.407631] RSP: 0018:ffff8800acd4f930 EFLAGS: 00010206 [ 32.413053] RAX: dffffc0000000000 RBX: ffff8801d9470000 RCX: 1ffff100168739c3 [ 32.420298] RDX: 000000000000000c RSI: ffffffff832cf9d6 RDI: 0000000000000060 [ 32.427548] RBP: ffff8800acd4f970 R08: ffffffff85331730 R09: 0000000000000001 [ 32.434886] R10: 0000000000000000 R11: ffff8800ad42c800 R12: ffff8800b439cdc0 [ 32.442132] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b439ce18 [ 32.449394] FS: 000000000260b880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.457593] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.463454] CR2: 0000000020df9ff0 CR3: 00000000b23b4000 CR4: 0000000000160670 [ 32.470702] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.477950] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.485198] Stack: [ 32.487316] ffff8801d9470088 ffff880000000001 ffff8801d9470088 ffff8801d9470000 [ 32.495301] ffff8800b439cdc0 dffffc0000000000 ffff8800b439ce18 0000000000000000 [ 32.503285] ffff8800acd4f9e0 ffffffff82f28f7b ffff8801d9470430 ffff8801d9470188 [ 32.511284] Call Trace: [ 32.513853] [] release_sock+0x17b/0x500 [ 32.519451] [] udp_sendmsg+0x12b0/0x1bb0 [ 32.525135] [] ? udp_push_pending_frames+0xe0/0xe0 [ 32.531684] [] ? udp4_lib_lookup+0x60/0x60 [ 32.537551] [] ? debug_check_no_locks_freed+0x210/0x210 [ 32.544540] [] ? sock_has_perm+0x1c1/0x400 [ 32.550413] [] ? sock_has_perm+0x29f/0x400 [ 32.556287] [] ? sock_has_perm+0x9f/0x400 [ 32.562080] [] ? inet_sendmsg+0x143/0x4d0 [ 32.567895] [] inet_sendmsg+0x203/0x4d0 [ 32.573519] [] ? inet_sendmsg+0x73/0x4d0 [ 32.579205] [] ? inet_recvmsg+0x4c0/0x4c0 [ 32.584979] [] sock_sendmsg+0xcc/0x110 [ 32.590490] [] SYSC_sendto+0x21c/0x370 [ 32.595999] [] ? SYSC_connect+0x300/0x300 [ 32.601774] [] ? _raw_spin_unlock+0x2c/0x50 [ 32.607721] [] ? do_huge_pmd_anonymous_page+0x38c/0x9d0 [ 32.614717] [] ? handle_mm_fault+0xbf7/0x2ff0 [ 32.620836] [] ? SYSC_bind+0x1da/0x280 [ 32.626357] [] ? __do_page_fault+0x385/0xa10 [ 32.632389] [] ? retint_user+0x18/0x3c [ 32.637900] [] SyS_sendto+0x40/0x50 [ 32.643162] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 32.649711] Code: 74 24 58 41 f6 c6 01 0f 85 a6 07 00 00 e8 ea 17 08 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 25 0e 00 00 41 f6 46 60 04 [ 32.676436] RIP [] udp_queue_rcv_skb+0x18f/0x1570 [ 32.683036] RSP [ 32.686688] ---[ end trace bd18c962f6a33689 ]--- [ 32.691446] Kernel panic - not syncing: Fatal exception in interrupt [ 32.698416] Dumping ftrace buffer: [ 32.701941] (ftrace buffer empty) [ 32.705625] Kernel Offset: disabled [ 32.709233] Rebooting in 86400 seconds..