[ 20.991864] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 21.249629] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.625645] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.696353] random: sshd: uninitialized urandom read (32 bytes read, 128 bits of entropy available) [ 22.792815] random: nonblocking pool is initialized Warning: Permanently added '10.128.0.17' (ECDSA) to the list of known hosts. executing program executing program executing program executing program [ 88.132929] kasan: CONFIG_KASAN_INLINE enabled [ 88.134329] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 88.134341] Dumping ftrace buffer: [ 88.134343] (ftrace buffer empty) [ 88.134345] Modules linked in: [ 88.134350] CPU: 1 PID: 3812 Comm: syzkaller207527 Not tainted 4.4.119-g855ea74 #27 [ 88.134352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.134355] task: ffff8800bae53000 task.stack: ffff8800ab170000 [ 88.134356] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 88.134367] RSP: 0018:ffff8800ab1779f0 EFLAGS: 00010a07 [ 88.134369] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b856b [ 88.134372] RDX: 1bd5a9d5a0000003 RSI: 0000000000000006 RDI: dead4ead0000001c [ 88.134374] RBP: ffff8800ab177a00 R08: 0000000048000000 R09: 0000000000001e30 [ 88.134376] R10: 0000000000002100 R11: 1ffff1001562ef1c R12: 0000000000000004 [ 88.134378] R13: 0000000000000020 R14: ffff8801d8be0000 R15: dffffc0000000000 [ 88.134381] FS: 0000000002023880(0063) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 88.134383] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 88.134385] CR2: 000000002085dff0 CR3: 00000000b15fc000 CR4: 0000000000160670 [ 88.134390] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 88.134391] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 88.134392] Stack: [ 88.134393] 0000000000000246 ffff8801d8be0158 ffff8800ab177a60 ffffffff825b8591 [ 88.134398] ffff8801d8be0170 ffffed003b17c02b ffffed003b17c02e ffff8801d8be0168 [ 88.134403] dead4ead00000000 ffff8801d8be0140 0000000000000000 0000000000000000 [ 88.134407] Call Trace: [ 88.134416] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 88.134419] [] sg_finish_rem_req+0x2b5/0x340 [ 88.134423] [] sg_new_read.isra.18+0x17d/0x3c0 [ 88.134427] [] sg_read+0x8bc/0x1490 [ 88.134432] [] ? __check_object_size+0x154/0x35b [ 88.134436] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 88.134440] [] ? fsnotify+0xee0/0xee0 [ 88.134446] [] ? avc_policy_seqno+0x9/0x20 [ 88.134450] [] do_loop_readv_writev+0x141/0x1e0 [ 88.134455] [] ? security_file_permission+0x89/0x1e0 [ 88.134458] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 88.134462] [] ? sg_proc_seq_show_debug+0xda0/0xda0 [ 88.134465] [] do_readv_writev+0x5dd/0x6e0 [ 88.134468] [] ? vfs_write+0x530/0x530 [ 88.134473] [] ? _raw_spin_unlock+0x2c/0x50 [ 88.134476] [] ? do_huge_pmd_anonymous_page+0x3dd/0xa10 [ 88.134482] [] ? handle_mm_fault+0x3f2/0x3190 [ 88.134485] [] ? __fsnotify_parent+0xbc/0x340 [ 88.134489] [] ? avc_policy_seqno+0x9/0x20 [ 88.134491] [] ? fsnotify+0x5ad/0xee0 [ 88.134494] [] vfs_readv+0x78/0xb0 [ 88.134497] [] SyS_readv+0xd9/0x240 [ 88.134501] [] ? rw_copy_check_uvector+0x2b0/0x2b0 [ 88.134505] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 88.134509] [] entry_SYSCALL_64_fastpath+0x1c/0x98 [ 88.134510] 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 [ 88.134567] RIP [] __free_pages+0x21/0x90 [ 88.134571] RSP [ 88.134575] ---[ end trace 6ab6d538d04aed8f ]--- [ 88.134577] Kernel panic - not syncing: Fatal exception [ 88.137667] Dumping ftrace buffer: [ 88.137668] (ftrace buffer empty) [ 88.137670] Kernel Offset: disabled [ 88.510803] Rebooting in 86400 seconds..