[ 19.489461] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.199135] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 23.478057] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 24.281600] random: sshd: uninitialized urandom read (32 bytes read, 107 bits of entropy available) [ 24.432284] random: sshd: uninitialized urandom read (32 bytes read, 110 bits of entropy available) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 52.914395] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) executing program executing program [ 53.062258] kasan: CONFIG_KASAN_INLINE enabled [ 53.066678] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 53.079520] Dumping ftrace buffer: [ 53.083030] (ftrace buffer empty) [ 53.086713] Modules linked in: [ 53.089992] CPU: 0 PID: 3806 Comm: syzkaller326542 Not tainted 4.4.115-g037d237 #9 [ 53.097664] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.106988] task: ffff8801d8841800 task.stack: ffff8800ba870000 [ 53.113012] RIP: 0010:[] [] udp_queue_rcv_skb+0x191/0x1560 [ 53.121939] RSP: 0018:ffff8800ba8778b0 EFLAGS: 00010206 [ 53.127354] RAX: dffffc0000000000 RBX: ffff8800bac08000 RCX: ffffffff831a9558 [ 53.134595] RDX: 000000000000000c RSI: ffff8801cf27fb40 RDI: 0000000000000060 [ 53.141843] RBP: ffff8800ba8778f0 R08: 0000000000000000 R09: 0000000000000001 [ 53.149090] R10: 0000000000000000 R11: 1ffff1001750eee8 R12: ffff8801cf27fb40 [ 53.156336] R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801cf27fb98 [ 53.163577] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009366840 [ 53.171773] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 53.177625] CR2: 000000002082dff0 CR3: 00000000baca6000 CR4: 0000000000160670 [ 53.184865] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 53.192119] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 53.199357] Stack: [ 53.201477] ffff8800bac08088 ffff880000000001 ffff8800bac08088 dffffc0000000000 [ 53.209441] ffff8800bac08000 0000000000000000 ffffed0017581086 ffff8801cf27fb40 [ 53.217405] ffff8800ba877960 ffffffff82df8b16 ffff8800bac08188 ffff8800bac08190 [ 53.225373] Call Trace: [ 53.227929] [] release_sock+0x176/0x510 [ 53.233535] [] udp_sendmsg+0x15c4/0x1c30 [ 53.239215] [] ? avc_has_perm_noaudit+0x460/0x460 [ 53.245678] [] ? udp_push_pending_frames+0xe0/0xe0 [ 53.252228] [] ? udp_seq_next+0x80/0x80 [ 53.257821] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 53.264807] [] ? sock_has_perm+0x1c1/0x400 [ 53.270660] [] ? sock_has_perm+0x29f/0x400 [ 53.276521] [] ? sock_has_perm+0x9f/0x400 [ 53.282375] [] ? selinux_file_send_sigiotask+0x310/0x310 [ 53.289441] [] ? inet_sendmsg+0x73/0x4c0 [ 53.295119] [] ? inet_sendmsg+0x201/0x4c0 [ 53.300893] [] inet_sendmsg+0x2bc/0x4c0 [ 53.306486] [] ? inet_sendmsg+0x73/0x4c0 [ 53.312170] [] ? inet_recvmsg+0x4c0/0x4c0 [ 53.317939] [] sock_sendmsg+0xca/0x110 [ 53.323444] [] SYSC_sendto+0x2c8/0x340 [ 53.328951] [] ? SYSC_connect+0x310/0x310 [ 53.334720] [] ? __lru_cache_add+0x164/0x240 [ 53.340762] [] ? do_huge_pmd_anonymous_page+0x549/0xa10 [ 53.347746] [] ? _raw_spin_unlock+0x2c/0x50 [ 53.353689] [] ? __do_page_fault+0x290/0xa00 [ 53.359719] [] SyS_sendto+0x40/0x50 [ 53.364962] [] ? SyS_getpeername+0x30/0x30 [ 53.370817] [] do_fast_syscall_32+0x314/0x890 [ 53.376954] [] sysenter_flags_fixed+0xd/0x17 [ 53.382978] Code: 74 24 58 41 f6 c6 01 0f 85 7f 07 00 00 e8 28 78 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 [ 53.409556] RIP [] udp_queue_rcv_skb+0x191/0x1560 [ 53.416150] RSP [ 53.419786] ---[ end trace 3c8ec543d9238f45 ]--- [ 53.424513] Kernel panic - not syncing: Fatal exception in interrupt [ 53.431349] Dumping ftrace buffer: [ 53.434866] (ftrace buffer empty) [ 53.438558] Kernel Offset: disabled [ 53.442153] Rebooting in 86400 seconds..