[ 20.705194] random: sshd: uninitialized urandom read (32 bytes read, 34 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: [ 25.375638] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 25.867440] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.841639] random: sshd: uninitialized urandom read (32 bytes read, 120 bits of entropy available) [ 27.006860] random: sshd: uninitialized urandom read (32 bytes read, 124 bits of entropy available) [ 30.944610] random: nonblocking pool is initialized Warning: Permanently added '10.128.10.8' (ECDSA) to the list of known hosts. net.ipv6.conf.syz_tun.accept_dad = 0 net.ipv6.conf.syz_tun.router_solicitations = 0 RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: File exists RTNETLINK answers: File exists 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" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth0" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" Cannot find device "veth1" executing program executing program [ 33.760043] kasan: CONFIG_KASAN_INLINE enabled [ 33.765146] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 33.778052] Dumping ftrace buffer: [ 33.781556] (ftrace buffer empty) [ 33.785232] Modules linked in: [ 33.788509] CPU: 1 PID: 3782 Comm: syzkaller652364 Not tainted 4.4.120-gd63fdf6 #28 [ 33.796268] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.805589] task: ffff8801c5130000 task.stack: ffff8800bb8a0000 [ 33.811609] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 33.819838] RSP: 0018:ffff8800bb8a79f0 EFLAGS: 00010a07 [ 33.825256] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b85eb [ 33.832495] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 33.839730] RBP: ffff8800bb8a7a00 R08: 0000000048000000 R09: 0000000000001e30 [ 33.846969] R10: 0000000000002100 R11: 1ffff10017714f1c R12: 0000000000000004 [ 33.854204] R13: 0000000000000020 R14: ffff8800b8ff0000 R15: dffffc0000000000 [ 33.861441] FS: 00000000021b9880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.869634] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.875487] CR2: 0000000020e94000 CR3: 00000000b07a2000 CR4: 0000000000160670 [ 33.882734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.889975] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.897220] Stack: [ 33.899346] 0000000000000246 ffff8800b8ff0158 ffff8800bb8a7a60 ffffffff825b8611 [ 33.907336] ffff8800b8ff0170 ffffed00171fe02b ffffed00171fe02e ffff8800b8ff0168 [ 33.915330] dead4ead00000000 ffff8800b8ff0140 0000000000000000 0000000000000000 [ 33.923308] Call Trace: [ 33.925870] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 33.932330] [] sg_finish_rem_req+0x2b5/0x340 [ 33.938356] [] sg_new_read.isra.18+0x17d/0x3c0 [ 33.944554] [] sg_read+0x8bc/0x1490 [ 33.949797] [] ? __check_object_size+0x154/0x35b [ 33.956171] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.962801] [] ? fsnotify+0xee0/0xee0 [ 33.968217] [] ? avc_policy_seqno+0x9/0x20 [ 33.974081] [] do_loop_readv_writev+0x141/0x1e0 [ 33.980376] [] ? security_file_permission+0x89/0x1e0 [ 33.987102] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 33.993733] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 34.000367] [] do_readv_writev+0x5dd/0x6e0 [ 34.006216] [] ? vfs_write+0x530/0x530 [ 34.011720] [] ? sg_ioctl+0x29f0/0x29f0 [ 34.017312] [] ? __vfs_write+0x10b/0x450 [ 34.022989] [] ? quarantine_put+0xab/0x180 [ 34.028838] [] ? putname+0xee/0x130 [ 34.034083] [] ? __fsnotify_parent+0xbc/0x340 [ 34.040195] [] ? avc_policy_seqno+0x9/0x20 [ 34.046046] [] ? fsnotify+0x5ad/0xee0 [ 34.051463] [] ? fsnotify+0xee0/0xee0 [ 34.056880] [] ? rw_verify_area+0x100/0x2f0 [ 34.062821] [] vfs_readv+0x78/0xb0 [ 34.067976] [] SyS_readv+0xd9/0x240 [ 34.073217] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 34.079764] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.086228] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 34.092770] Code: c6 a0 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 34.119220] RIP [] __free_pages+0x21/0x90 [ 34.125103] RSP [ 34.130632] ---[ end trace e57b102f3f9cc955 ]--- [ 34.135396] Kernel panic - not syncing: Fatal exception [ 34.141140] Dumping ftrace buffer: [ 34.144649] (ftrace buffer empty) [ 34.148326] Kernel Offset: disabled [ 34.151917] Rebooting in 86400 seconds..