[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.381639] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.194086] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 22.520976] random: sshd: uninitialized urandom read (32 bytes read, 42 bits of entropy available) [ 23.364523] random: sshd: uninitialized urandom read (32 bytes read, 101 bits of entropy available) [ 46.420489] random: sshd: uninitialized urandom read (32 bytes read, 111 bits of entropy available) Warning: Permanently added '10.128.0.47' (ECDSA) to the list of known hosts. [ 51.818166] random: sshd: uninitialized urandom read (32 bytes read, 117 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 52.322140] random: nonblocking pool is initialized [ 52.323669] kasan: CONFIG_KASAN_INLINE enabled [ 52.323675] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 52.323678] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 52.323681] Dumping ftrace buffer: [ 52.323683] (ftrace buffer empty) [ 52.323685] Modules linked in: [ 52.323690] CPU: 0 PID: 3337 Comm: syzkaller233787 Not tainted 4.4.107-g610c835 #4 [ 52.323692] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.323695] task: ffff8800b5b80000 task.stack: ffff8800b5290000 [ 52.323706] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 52.323709] RSP: 0018:ffff8800b5297970 EFLAGS: 00010a07 [ 52.323711] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 52.323713] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 52.323715] RBP: ffff8800b5297980 R08: 0000000000000001 R09: 0000000000000000 [ 52.323717] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 52.323719] R13: 0000000000000020 R14: ffff8800b09b8000 R15: dffffc0000000000 [ 52.323723] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009e72840 [ 52.323725] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 52.323728] CR2: 0000000020c19000 CR3: 00000000b58c9000 CR4: 00000000001406f0 [ 52.323731] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 52.323733] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 52.323734] Stack: [ 52.323738] 0000000000000000 ffff8800b09b8158 ffff8800b52979e0 ffffffff825b8cf1 [ 52.323743] ffff8800b09b8170 ffffed001613702b ffffed001613702e ffff8800b09b8168 [ 52.323747] dead4ead00000000 ffff8800b09b8140 0000000000000000 0000000000000000 [ 52.323747] Call Trace: [ 52.323755] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 52.323759] [] sg_finish_rem_req+0x2b5/0x340 [ 52.323763] [] sg_new_read.isra.18+0x39/0x3c0 [ 52.323766] [] ? sg_get_rq_mark+0x142/0x190 [ 52.323770] [] sg_read+0x8c2/0x1490 [ 52.323776] [] ? __kmalloc+0x124/0x320 [ 52.323780] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 52.323784] [] ? fsnotify+0xee0/0xee0 [ 52.323790] [] ? avc_policy_seqno+0x9/0x20 [ 52.323796] [] do_loop_readv_writev+0x141/0x1e0 [ 52.323800] [] ? security_file_permission+0x89/0x1e0 [ 52.323804] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 52.323807] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 52.323812] [] compat_do_readv_writev+0x5df/0x6e0 [ 52.323815] [] ? vfs_writev+0xb0/0xb0 [ 52.323821] [] ? _raw_spin_unlock+0x2c/0x50 [ 52.323825] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 52.323830] [] ? handle_mm_fault+0x3f2/0x3190 [ 52.323834] [] ? rw_verify_area+0x100/0x2f0 [ 52.323838] [] compat_readv+0xd9/0x140 [ 52.323841] [] compat_SyS_readv+0xd8/0x1b0 [ 52.323844] [] ? SyS_pwritev+0x230/0x230 [ 52.323849] [] ? do_fast_syscall_32+0xd7/0x890 [ 52.323852] [] ? SyS_pwritev+0x230/0x230 [ 52.323855] [] do_fast_syscall_32+0x314/0x890 [ 52.323859] [] sysenter_flags_fixed+0xd/0x17 [ 52.323910] Code: 76 ae 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 [ 52.323913] RIP [] __free_pages+0x21/0x90 [ 52.323915] RSP [ 52.323920] ---[ end trace 40d7148ea92b67ee ]--- [ 52.323922] Kernel panic - not syncing: Fatal exception [ 52.687719] Dumping ftrace buffer: [ 52.691251] (ftrace buffer empty) [ 52.694931] Kernel Offset: disabled [ 52.698521] Rebooting in 86400 seconds..