[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.165472] 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: [ 24.513601] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.846452] random: sshd: uninitialized urandom read (32 bytes read, 38 bits of entropy available) [ 25.602124] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 27.813926] random: sshd: uninitialized urandom read (32 bytes read, 72 bits of entropy available) Warning: Permanently added '10.128.10.47' (ECDSA) to the list of known hosts. [ 33.661471] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 33.750092] BUG: unable to handle kernel paging request at ffffeafff8d60008 [ 33.757641] IP: [] page_remove_rmap+0x2e/0x260 [ 33.763913] PGD 0 [ 33.766176] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.771179] Dumping ftrace buffer: [ 33.774726] (ftrace buffer empty) [ 33.778472] Modules linked in: [ 33.781894] CPU: 0 PID: 3841 Comm: syz-executor396 Not tainted 4.4.150-g5541782 #83 [ 33.789671] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.799042] task: ffff8801c8b00000 task.stack: ffff8801d9038000 [ 33.805086] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.813905] RSP: 0018:ffff8801d903f9c0 EFLAGS: 00010246 [ 33.819342] RAX: dffffc0000000000 RBX: ffffeafff8d60000 RCX: 0000000000000000 [ 33.826600] RDX: 1ffffd5fff1ac001 RSI: ffffffff814bceaf RDI: ffffeafff8d60008 [ 33.833861] RBP: ffff8801d903f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.841120] R10: 0000000000000001 R11: ffff8801c8b00000 R12: 0000000000000001 [ 33.848376] R13: 1ffff1003b207f3e R14: ffff8801cad29800 R15: ffffeafff8d60000 [ 33.855636] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.863898] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.869770] CR2: ffffeafff8d60008 CR3: 00000001d0997000 CR4: 00000000001606f0 [ 33.877030] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.884288] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.891541] Stack: [ 33.893674] ffff8801d903fc50 0000000000000001 ffff8801d903fa78 ffffffff8150ad13 [ 33.901741] 00003ffe358001e0 00003ffe358001e0 0000000041b58ab3 ffffffff841ef837 [ 33.909786] ffffffff8150ab10 00000000000004f0 ffff8801d0829b00 ffff8801d903fa40 [ 33.917900] Call Trace: [ 33.920525] [] zap_huge_pmd+0x203/0x510 [ 33.926141] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.932739] [] unmap_single_vma+0xea3/0x1240 [ 33.938842] [] ? vm_normal_page+0x280/0x280 [ 33.944849] [] ? __put_single_page+0x60/0x60 [ 33.950895] [] unmap_vmas+0x81/0xd0 [ 33.956205] [] exit_mmap+0x1c9/0x3a0 [ 33.961561] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.968042] [] ? lock_acquire+0x19f/0x450 [ 33.973829] [] ? up_write+0x1a/0x60 [ 33.979094] [] mmput+0xf8/0x2d0 [ 33.984012] [] do_exit+0x8d8/0x26b0 [ 33.989277] [] ? file_map_prot_check+0x193/0x310 [ 33.995674] [] ? release_task.part.17+0x1200/0x1200 [ 34.002358] [] ? SyS_mprotect+0x41e/0x640 [ 34.008196] [] ? up_write+0x1a/0x60 [ 34.013466] [] ? SyS_mprotect+0x423/0x640 [ 34.019256] [] ? retint_user+0x18/0x3c [ 34.024782] [] do_group_exit+0x111/0x330 [ 34.030481] [] ? trace_hardirqs_on_thunk+0x17/0x19 [ 34.037051] [] SyS_exit_group+0x1d/0x20 [ 34.042667] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.049429] Code: e5 41 54 53 48 89 fb e8 31 76 e9 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 de 01 00 00 43 08 01 0f 84 4e 01 00 00 e8 03 76 e9 ff f0 83 43 18 ff 78 [ 34.077351] RIP [] page_remove_rmap+0x2e/0x260 [ 34.083730] RSP [ 34.087340] CR2: ffffeafff8d60008 [ 34.090835] ---[ end trace 7ea3e0967f67d179 ]--- [ 34.095576] Kernel panic - not syncing: Fatal exception [ 34.101405] Dumping ftrace buffer: [ 34.104945] (ftrace buffer empty) [ 34.109019] Kernel Offset: disabled [ 34.112633] Rebooting in 86400 seconds..