[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.570376] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.881340] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.734020] random: sshd: uninitialized urandom read (32 bytes read, 121 bits of entropy available) [ 23.903444] random: sshd: uninitialized urandom read (32 bytes read, 127 bits of entropy available) [ 23.991374] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.32' (ECDSA) to the list of known hosts. [ 29.398508] IPVS: Creating netns size=2552 id=1 [ 29.420710] IPVS: Creating netns size=2552 id=2 executing program [ 29.442707] IPVS: Creating netns size=2552 id=3 [ 29.467411] IPVS: Creating netns size=2552 id=4 [ 29.472029] kasan: CONFIG_KASAN_INLINE enabled [ 29.472037] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 29.472041] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 29.472047] Dumping ftrace buffer: [ 29.472049] (ftrace buffer empty) [ 29.472053] Modules linked in: [ 29.472059] CPU: 0 PID: 3726 Comm: syzkaller624899 Not tainted 4.4.115-g037d237 #8 [ 29.472062] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.472066] task: ffff8801d95ae000 task.stack: ffff8801c8578000 [ 29.472080] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 29.472084] RSP: 0018:ffff8801c857f9f0 EFLAGS: 00010a07 [ 29.472087] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b872b [ 29.472091] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 29.472094] RBP: ffff8801c857fa00 R08: 0000000048000000 R09: 0000000000001e30 [ 29.472098] R10: 0000000000002100 R11: 1ffff100390aff1c R12: 0000000000000004 [ 29.472101] R13: 0000000000000020 R14: ffff8801d9342100 R15: dffffc0000000000 [ 29.472106] FS: 00000000022bb880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.472110] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.472113] CR2: 000000002037e000 CR3: 00000001ccc8a000 CR4: 0000000000160670 [ 29.472120] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 29.472122] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 29.472123] Stack: [ 29.472130] 0000000000000246 ffff8801d9342258 ffff8801c857fa60 ffffffff825b8751 [ 29.472141] ffff8801d9342270 ffffed003b26844b ffffed003b26844e ffff8801d9342268 [ 29.472148] dead4ead00000000 ffff8801d9342240 0000000000000000 0000000000000000 [ 29.472149] Call Trace: [ 29.472160] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 29.472167] [] sg_finish_rem_req+0x2b5/0x340 [ 29.472173] [] sg_new_read.isra.18+0x17d/0x3c0 [ 29.472179] [] sg_read+0x8bc/0x1490 [ 29.472188] [] ? __check_object_size+0x154/0x35b [ 29.472195] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.472201] [] ? fsnotify+0xee0/0xee0 [ 29.472210] [] ? avc_policy_seqno+0x9/0x20 [ 29.472218] [] do_loop_readv_writev+0x141/0x1e0 [ 29.472224] [] ? security_file_permission+0x89/0x1e0 [ 29.472231] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.472237] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 29.472242] [] do_readv_writev+0x5dd/0x6e0 [ 29.472247] [] ? vfs_write+0x530/0x530 [ 29.472254] [] ? _raw_spin_unlock+0x2c/0x50 [ 29.472260] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 29.472268] [] ? handle_mm_fault+0x3f2/0x3190 [ 29.472273] [] ? __fsnotify_parent+0xbc/0x340 [ 29.472279] [] ? avc_policy_seqno+0x9/0x20 [ 29.472284] [] ? fsnotify+0x5ad/0xee0 [ 29.472292] [] ? __do_page_fault+0x290/0xa00 [ 29.472297] [] vfs_readv+0x78/0xb0 [ 29.472302] [] SyS_readv+0xd9/0x240 [ 29.472308] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 29.472315] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 29.472321] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 29.472406] Code: c6 9f 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 [ 29.472412] RIP [] __free_pages+0x21/0x90 [ 29.472414] RSP [ 29.472420] ---[ end trace f702bd4ca9475e19 ]--- [ 29.472424] Kernel panic - not syncing: Fatal exception [ 29.477145] Dumping ftrace buffer: [ 29.477147] (ftrace buffer empty) [ 29.477149] Kernel Offset: disabled [ 29.844035] Rebooting in 86400 seconds..