[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 18.860883] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 19.876499] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.113517] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 20.963468] random: sshd: uninitialized urandom read (32 bytes read, 112 bits of entropy available) [ 21.116337] random: sshd: uninitialized urandom read (32 bytes read, 116 bits of entropy available) Warning: Permanently added '10.128.0.33' (ECDSA) to the list of known hosts. [ 26.495349] random: sshd: uninitialized urandom read (32 bytes read, 125 bits of entropy available) executing program [ 26.581331] kasan: CONFIG_KASAN_INLINE enabled [ 26.585743] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 26.598743] Dumping ftrace buffer: [ 26.602248] (ftrace buffer empty) [ 26.605925] Modules linked in: [ 26.609200] CPU: 0 PID: 3710 Comm: syzkaller599852 Not tainted 4.4.115-g5e56f24 #13 [ 26.616957] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.626300] task: ffff8800ae434800 task.stack: ffff8801d9058000 [ 26.632324] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 26.640554] RSP: 0018:ffff8801d905fa40 EFLAGS: 00010a07 [ 26.645972] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b870b [ 26.653211] RDX: 1bd5a9d5a0000003 RSI: 0000000000000000 RDI: dead4ead0000001c [ 26.660448] RBP: ffff8801d905fa50 R08: 0000000000000000 R09: 0000000000000000 [ 26.667684] R10: 0000000000000000 R11: 1ffff1003b20bf26 R12: 0000000000000004 [ 26.674921] R13: 0000000000000020 R14: ffff8801d90dc200 R15: dffffc0000000000 [ 26.682159] FS: 00000000012cd880(0063) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 26.690351] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.696208] CR2: 0000000020adff12 CR3: 00000001d237e000 CR4: 0000000000160670 [ 26.703446] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 26.710683] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 26.717920] Stack: [ 26.720035] ffffffff837750e9 ffff8801d90dc358 ffff8801d905fab0 ffffffff825b8731 [ 26.727998] ffff8801d90dc370 ffffed003b21b86b ffffed003b21b86e ffff8801d90dc368 [ 26.735955] dead4ead00000000 ffff8801d90dc340 0000000000000000 0000000000000000 [ 26.743911] Call Trace: [ 26.746470] [] ? retint_kernel+0x2d/0x2d [ 26.752151] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 26.758609] [] sg_finish_rem_req+0x2b5/0x340 [ 26.764636] [] sg_read+0xa1b/0x1490 [ 26.769884] [] ? __check_object_size+0x154/0x35b [ 26.776255] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.782888] [] ? fsnotify+0xee0/0xee0 [ 26.788307] [] ? avc_policy_seqno+0x9/0x20 [ 26.794158] [] do_loop_readv_writev+0x141/0x1e0 [ 26.800444] [] ? security_file_permission+0x89/0x1e0 [ 26.807162] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.813795] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 26.820429] [] do_readv_writev+0x5dd/0x6e0 [ 26.826282] [] ? vfs_write+0x530/0x530 [ 26.831787] [] ? sg_ioctl+0x29f0/0x29f0 [ 26.837379] [] ? __vfs_write+0x10b/0x450 [ 26.843055] [] ? handle_mm_fault+0x3f2/0x3190 [ 26.849168] [] ? __do_page_fault+0x380/0xa00 [ 26.855192] [] ? __fsnotify_parent+0xbc/0x340 [ 26.861304] [] ? avc_policy_seqno+0x9/0x20 [ 26.867155] [] ? fsnotify+0x5ad/0xee0 [ 26.872579] [] ? fsnotify+0xee0/0xee0 [ 26.878003] [] ? rw_verify_area+0x100/0x2f0 [ 26.883941] [] vfs_readv+0x78/0xb0 [ 26.889097] [] SyS_readv+0xd9/0x240 [ 26.894342] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 26.900887] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 26.907351] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 26.913894] 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 [ 26.940339] RIP [] __free_pages+0x21/0x90 [ 26.946220] RSP [ 26.949940] ---[ end trace 3a8eafdc5572e787 ]--- [ 26.954687] Kernel panic - not syncing: Fatal exception [ 26.960478] Dumping ftrace buffer: [ 26.963986] (ftrace buffer empty) [ 26.967666] Kernel Offset: disabled [ 26.971258] Rebooting in 86400 seconds..