[ 17.043957] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.106546] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.431992] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.226767] random: sshd: uninitialized urandom read (32 bytes read, 109 bits of entropy available) [ 34.295181] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) Warning: Permanently added '10.128.15.214' (ECDSA) to the list of known hosts. [ 39.688190] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" executing program executing program [ 40.432147] kasan: CONFIG_KASAN_INLINE enabled [ 40.436606] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 40.449442] Dumping ftrace buffer: [ 40.452951] (ftrace buffer empty) [ 40.456628] Modules linked in: [ 40.459909] CPU: 1 PID: 3905 Comm: syzkaller994090 Not tainted 4.4.115-g0e9bcc1 #11 [ 40.467673] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.477000] task: ffff8800bafac800 task.stack: ffff8801d8718000 [ 40.483027] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 40.492390] RSP: 0018:ffff8801d871f928 EFLAGS: 00010206 [ 40.497807] RAX: dffffc0000000000 RBX: ffff8801d8568000 RCX: ffffffff831a9648 [ 40.505045] RDX: 000000000000000c RSI: ffff8800b1307280 RDI: 0000000000000060 [ 40.512290] RBP: ffff8801d871f968 R08: 0000000000000000 R09: 0000000000000001 [ 40.519527] R10: 0000000000000000 R11: 1ffff1003b0e3ef6 R12: ffff8800b1307280 [ 40.526766] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8800b13072d8 [ 40.534006] FS: 000000000111f880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 40.542200] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 40.548051] CR2: 0000000020df9ff0 CR3: 00000001d8a0c000 CR4: 0000000000160670 [ 40.555299] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 40.562538] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 40.569776] Stack: [ 40.571893] ffff8801d8568088 ffff880100000001 ffff8801d8568088 dffffc0000000000 [ 40.579863] ffff8801d8568000 0000000000000000 ffffed003b0ad086 ffff8800b1307280 [ 40.587828] ffff8801d871f9d8 ffffffff82df8b96 ffff8801d8568188 ffff8801d8568190 [ 40.595798] Call Trace: [ 40.598356] [] release_sock+0x176/0x510 [ 40.603948] [] udp_sendmsg+0x15c4/0x1c30 [ 40.609641] [] ? avc_has_perm_noaudit+0x460/0x460 [ 40.616112] [] ? udp_push_pending_frames+0xe0/0xe0 [ 40.622657] [] ? udp_seq_next+0x80/0x80 [ 40.628251] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 40.635233] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 40.642213] [] ? sock_has_perm+0x1c1/0x400 [ 40.648068] [] ? sock_has_perm+0x29f/0x400 [ 40.653921] [] ? sock_has_perm+0x9f/0x400 [ 40.659688] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 40.666757] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 40.673740] [] ? inet_sendmsg+0x73/0x4c0 [ 40.679417] [] ? inet_sendmsg+0x201/0x4c0 [ 40.685183] [] inet_sendmsg+0x2bc/0x4c0 [ 40.690773] [] ? inet_sendmsg+0x73/0x4c0 [ 40.696450] [] ? inet_recvmsg+0x4c0/0x4c0 [ 40.702217] [] sock_sendmsg+0xca/0x110 [ 40.707725] [] SYSC_sendto+0x2c8/0x340 [ 40.713233] [] ? SYSC_connect+0x310/0x310 [ 40.719001] [] ? _raw_spin_unlock+0x2c/0x50 [ 40.724946] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 40.731928] [] ? handle_mm_fault+0x3f2/0x3190 [ 40.738040] [] ? SYSC_bind+0x1ad/0x280 [ 40.743552] [] ? __do_page_fault+0x290/0xa00 [ 40.749577] [] ? __do_page_fault+0x380/0xa00 [ 40.755606] [] ? up_read+0x1a/0x40 [ 40.760762] [] ? __do_page_fault+0x149/0xa00 [ 40.766792] [] ? move_addr_to_kernel+0x50/0x50 [ 40.772993] [] SyS_sendto+0x40/0x50 [ 40.778241] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 40.784785] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 38 77 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 [ 40.811417] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 40.817995] RSP [ 40.821644] ---[ end trace 4edb6c65c72b56b7 ]--- [ 40.826372] Kernel panic - not syncing: Fatal exception in interrupt [ 40.833227] Dumping ftrace buffer: [ 40.836746] (ftrace buffer empty) [ 40.840432] Kernel Offset: disabled [ 40.844033] Rebooting in 86400 seconds..