[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.916217] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.307969] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.118290] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 39.865513] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) [ 49.405017] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.14' (ECDSA) to the list of known hosts. executing program executing program [ 73.970238] kasan: CONFIG_KASAN_INLINE enabled [ 73.974705] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 73.987519] Dumping ftrace buffer: [ 73.991025] (ftrace buffer empty) [ 73.994703] Modules linked in: [ 73.997981] CPU: 0 PID: 3813 Comm: syzkaller577424 Not tainted 4.4.115-g037d237 #8 [ 74.005655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.015412] task: ffff8801d8a6c800 task.stack: ffff8801d84d8000 [ 74.021449] RIP: 0010:[] [] udpv6_queue_rcv_skb+0x191/0x1510 [ 74.030549] RSP: 0018:ffff8801d84df648 EFLAGS: 00010206 [ 74.035966] RAX: dffffc0000000000 RBX: ffff8800bb2b8000 RCX: ffffffff83373488 [ 74.043204] RDX: 000000000000000c RSI: ffff8801cd67b000 RDI: 0000000000000060 [ 74.050445] RBP: ffff8801d84df688 R08: 0000000000000001 R09: 0000000000000000 [ 74.057684] R10: 0000000000000000 R11: 1ffff1003b09be9a R12: ffff8801cd67b000 [ 74.064923] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801cd67b058 [ 74.072167] FS: 000000000269a940(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 74.080361] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.086210] CR2: 0000000020ecc000 CR3: 00000001c542e000 CR4: 0000000000160670 [ 74.093450] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.100696] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.107932] Stack: [ 74.110050] 00000001bb2b8088 ffff8800bb2b8000 ffff8800bb2b8088 dffffc0000000000 [ 74.118036] ffff8800bb2b8000 0000000000000000 ffffed0017657086 ffff8801cd67b000 [ 74.126002] ffff8801d84df6f8 ffffffff82df8b16 ffff8800bb2b8188 ffff8800bb2b8190 [ 74.133970] Call Trace: [ 74.136528] [] release_sock+0x176/0x510 [ 74.142121] [] udp_sendmsg+0x15c4/0x1c30 [ 74.147804] [] ? udp_push_pending_frames+0xe0/0xe0 [ 74.154351] [] ? udp_seq_next+0x80/0x80 [ 74.159944] [] ? print_context_stack+0x48/0xc0 [ 74.166145] [] ? udpv6_sendmsg+0x2d7/0x2500 [ 74.172087] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 74.179069] [] ? __rmqueue.isra.97+0x593/0x1270 [ 74.185358] [] ? __module_text_address+0x13/0x140 [ 74.191826] [] ? is_module_text_address+0x2a/0x50 [ 74.198288] [] ? __kernel_text_address+0x6b/0xa0 [ 74.204661] [] ? print_context_stack+0x48/0xc0 [ 74.210863] [] udpv6_sendmsg+0x1434/0x2500 [ 74.216720] [] ? avc_has_perm+0xb6/0x500 [ 74.222403] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 74.229383] [] ? avc_has_perm+0x296/0x500 [ 74.235155] [] ? udp6_lib_lookup+0x60/0x60 [ 74.241008] [] ? avc_has_perm_noaudit+0x460/0x460 [ 74.247469] [] ? ptlock_alloc+0x24/0x70 [ 74.253070] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 74.260049] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 74.267031] [] ? sock_has_perm+0x1c1/0x400 [ 74.272885] [] ? sock_has_perm+0x29f/0x400 [ 74.279002] [] ? sock_has_perm+0x9f/0x400 [ 74.284767] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 74.291836] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 74.298817] [] ? inet_sendmsg+0x73/0x4c0 [ 74.304495] [] ? inet_sendmsg+0x201/0x4c0 [ 74.310259] [] inet_sendmsg+0x2bc/0x4c0 [ 74.315857] [] ? inet_sendmsg+0x73/0x4c0 [ 74.321630] [] ? inet_recvmsg+0x4c0/0x4c0 [ 74.327394] [] sock_sendmsg+0xca/0x110 [ 74.332906] [] SYSC_sendto+0x2c8/0x340 [ 74.338410] [] ? SYSC_connect+0x310/0x310 [ 74.344178] [] ? _raw_spin_unlock+0x2c/0x50 [ 74.350130] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 74.357112] [] ? handle_mm_fault+0x3f2/0x3190 [ 74.363223] [] ? __fdget+0x18/0x20 [ 74.368382] [] ? up_read+0x1a/0x40 [ 74.373542] [] ? __do_page_fault+0x149/0xa00 [ 74.379570] [] SyS_sendto+0x40/0x50 [ 74.384815] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 74.391360] Code: 74 24 58 41 f6 c6 01 0f 85 b7 07 00 00 e8 f8 d8 fe 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 7c 0b 00 00 41 f6 46 60 04 [ 74.417939] RIP [] udpv6_queue_rcv_skb+0x191/0x1510 [ 74.424692] RSP [ 74.428325] ---[ end trace 7d83f53c4680258c ]--- [ 74.433062] Kernel panic - not syncing: Fatal exception in interrupt [ 74.440037] Dumping ftrace buffer: [ 74.443548] (ftrace buffer empty) [ 74.447231] Kernel Offset: disabled [ 74.450826] Rebooting in 86400 seconds..