[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.896138] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.852939] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.118439] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.936036] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) [ 22.103600] random: sshd: uninitialized urandom read (32 bytes read, 100 bits of entropy available) Warning: Permanently added '10.128.15.218' (ECDSA) to the list of known hosts. [ 27.500070] random: sshd: uninitialized urandom read (32 bytes read, 108 bits of entropy available) executing program [ 27.592831] kasan: CONFIG_KASAN_INLINE enabled [ 27.597264] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.610763] Dumping ftrace buffer: [ 27.614269] (ftrace buffer empty) [ 27.617946] Modules linked in: [ 27.622357] CPU: 1 PID: 3319 Comm: syzkaller496674 Not tainted 4.4.107-g610c835 #4 [ 27.630033] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.639354] task: ffff8800b5172f80 task.stack: ffff8800b5b10000 [ 27.645376] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.653607] RSP: 0018:ffff8800b5b17a40 EFLAGS: 00010a07 [ 27.659028] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b8ccb [ 27.666264] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.673497] RBP: ffff8800b5b17a50 R08: 0000000000000001 R09: 0000000000000000 [ 27.680740] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004 [ 27.687984] R13: 0000000000000020 R14: ffff8801d0ab0000 R15: dffffc0000000000 [ 27.695243] FS: 0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000098c9840 [ 27.703449] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.709299] CR2: 0000000020001000 CR3: 00000001ccba5000 CR4: 00000000001406e0 [ 27.716549] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.723790] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.731035] Stack: [ 27.733152] 0000000000000000 ffff8801d0ab0158 ffff8800b5b17ab0 ffffffff825b8cf1 [ 27.741115] ffff8801d0ab0170 ffffed003a15602b ffffed003a15602e ffff8801d0ab0168 [ 27.749061] dead4ead00000000 ffff8801d0ab0140 0000000000000000 0000000000000000 [ 27.757013] Call Trace: [ 27.759575] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.766041] [] sg_finish_rem_req+0x2b5/0x340 [ 27.772066] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.778174] [] ? sg_get_rq_mark+0x142/0x190 [ 27.784120] [] sg_read+0x8c2/0x1490 [ 27.789363] [] ? __schedule+0xa99/0x1c70 [ 27.795559] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 27.802123] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.808755] [] ? __lock_is_held+0xa1/0xf0 [ 27.814517] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.821149] [] __vfs_read+0x103/0x440 [ 27.826573] [] ? vfs_iter_write+0x2d0/0x2d0 [ 27.832519] [] ? fsnotify+0x5ad/0xee0 [ 27.838203] [] ? fsnotify+0xee0/0xee0 [ 27.846069] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.853314] [] ? avc_policy_seqno+0x9/0x20 [ 27.859176] [] ? selinux_file_permission+0x348/0x460 [ 27.865895] [] ? security_file_permission+0x89/0x1e0 [ 27.872626] [] ? rw_verify_area+0x100/0x2f0 [ 27.878564] [] vfs_read+0x123/0x3a0 [ 27.883809] [] SyS_read+0xd9/0x1b0 [ 27.888967] [] ? do_sendfile+0xd30/0xd30 [ 27.894646] [] ? do_fast_syscall_32+0xd7/0x890 [ 27.900844] [] ? do_sendfile+0xd30/0xd30 [ 27.906518] [] do_fast_syscall_32+0x314/0x890 [ 27.912629] [] sysenter_flags_fixed+0xd/0x17 [ 27.918651] 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 [ 27.944989] RIP [] __free_pages+0x21/0x90 [ 27.950874] RSP [ 27.954773] ---[ end trace 634078133094bd3a ]--- [ 27.959514] Kernel panic - not syncing: Fatal exception [ 27.964890] Dumping ftrace buffer: [ 27.968402] (ftrace buffer empty) [ 27.972078] Kernel Offset: disabled [ 27.975670] Rebooting in 86400 seconds..