[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.087794] 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: [ 30.598790] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.028121] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 31.808514] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 31.985433] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. [ 37.567899] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 37.667319] kasan: CONFIG_KASAN_INLINE enabled [ 37.671751] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 37.684631] Dumping ftrace buffer: [ 37.688143] (ftrace buffer empty) [ 37.691827] Modules linked in: [ 37.695135] CPU: 1 PID: 3841 Comm: syz-executor619 Not tainted 4.4.147-ga5fc665 #80 [ 37.702904] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.712253] task: ffff8800aca8e000 task.stack: ffff8801d8d18000 [ 37.718284] RIP: 0010:[] [] udp_queue_rcv_skb+0x18f/0x1580 [ 37.727224] RSP: 0018:ffff8801d8d1f930 EFLAGS: 00010206 [ 37.732645] RAX: dffffc0000000000 RBX: ffff8800bb2f0000 RCX: 1ffff1003b2f194b [ 37.739894] RDX: 000000000000000c RSI: ffffffff832d8ea6 RDI: 0000000000000060 [ 37.747136] RBP: ffff8801d8d1f970 R08: ffffffff853656b0 R09: 0000000000000001 [ 37.754379] R10: 0000000000000000 R11: ffff8800aca8e000 R12: ffff8801d978ca00 [ 37.761624] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801d978ca58 [ 37.768871] FS: 0000000001867880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 37.777076] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.782953] CR2: 000000002082dff0 CR3: 00000000b25b9000 CR4: 00000000001606f0 [ 37.790199] Stack: [ 37.792324] ffff8800bb2f0088 ffff880100000001 ffff8800bb2f0088 ffff8800bb2f0000 [ 37.800310] ffff8801d978ca00 dffffc0000000000 ffff8801d978ca58 0000000000000000 [ 37.808294] ffff8801d8d1f9e0 ffffffff82f30e0b ffff8800bb2f0430 ffff8800bb2f0188 [ 37.816280] Call Trace: [ 37.818846] [] release_sock+0x17b/0x500 [ 37.824444] [] udp_sendmsg+0x1152/0x1c70 [ 37.830129] [] ? udp_push_pending_frames+0xe0/0xe0 [ 37.836701] [] ? udp4_lib_lookup+0x60/0x60 [ 37.842567] [] ? debug_check_no_locks_freed+0x210/0x210 [ 37.849558] [] ? sock_has_perm+0x1c1/0x400 [ 37.855416] [] ? sock_has_perm+0x29f/0x400 [ 37.861278] [] ? sock_has_perm+0x9f/0x400 [ 37.867050] [] ? inet_sendmsg+0x143/0x4d0 [ 37.872827] [] inet_sendmsg+0x203/0x4d0 [ 37.878428] [] ? inet_sendmsg+0x73/0x4d0 [ 37.884117] [] ? inet_recvmsg+0x4c0/0x4c0 [ 37.889892] [] sock_sendmsg+0xcc/0x110 [ 37.895402] [] SYSC_sendto+0x21c/0x370 [ 37.900915] [] ? SYSC_connect+0x300/0x300 [ 37.906690] [] ? _raw_spin_unlock+0x2c/0x50 [ 37.912641] [] ? do_huge_pmd_anonymous_page+0x38c/0x9d0 [ 37.919631] [] ? handle_mm_fault+0xbf7/0x30b0 [ 37.925749] [] ? SYSC_bind+0x1da/0x280 [ 37.931265] [] ? __do_page_fault+0x38a/0xa10 [ 37.937298] [] ? retint_user+0x18/0x3c [ 37.942812] [] SyS_sendto+0x40/0x50 [ 37.948079] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 37.954647] Code: 74 24 58 41 f6 c6 01 0f 85 ae 07 00 00 e8 1a a9 07 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 2d 0e 00 00 41 f6 46 60 04 [ 37.981486] RIP [] udp_queue_rcv_skb+0x18f/0x1580 [ 37.988076] RSP [ 37.991724] ---[ end trace a0c0a4552e0ecdc2 ]--- [ 37.996473] Kernel panic - not syncing: Fatal exception in interrupt [ 38.003268] Dumping ftrace buffer: [ 38.006790] (ftrace buffer empty) [ 38.010476] Kernel Offset: disabled [ 38.014074] Rebooting in 86400 seconds..