[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.681374] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.465054] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.040821] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.610960] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 27.791506] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) Warning: Permanently added '10.128.0.13' (ECDSA) to the list of known hosts. [ 33.609736] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) executing program [ 33.699911] BUG: unable to handle kernel paging request at ffffeafff8cc8008 [ 33.707283] IP: [] page_remove_rmap+0x2e/0x260 [ 33.713527] PGD 0 [ 33.715813] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.720770] Dumping ftrace buffer: [ 33.724287] (ftrace buffer empty) [ 33.727976] Modules linked in: [ 33.731283] CPU: 1 PID: 3839 Comm: syz-executor705 Not tainted 4.4.150-g5541782 #19 [ 33.739053] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.748411] task: ffff8801d2d54800 task.stack: ffff8801d9280000 [ 33.754450] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 33.763138] RSP: 0018:ffff8801d9287948 EFLAGS: 00010246 [ 33.768562] RAX: dffffc0000000000 RBX: ffffeafff8cc8000 RCX: 0000000000000000 [ 33.775809] RDX: 1ffffd5fff199001 RSI: ffffffff814bceaf RDI: ffffeafff8cc8008 [ 33.783055] RBP: ffff8801d9287958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 33.790303] R10: 0000000000000001 R11: ffff8801d2d54800 R12: 0000000000000001 [ 33.797564] R13: 1ffff1003b250f2f R14: ffff8801d0809800 R15: ffffeafff8cc8000 [ 33.804824] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 33.813027] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 33.818889] CR2: ffffeafff8cc8008 CR3: 00000001ca7b3000 CR4: 00000000001606f0 [ 33.826136] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 33.833402] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 33.840662] Stack: [ 33.842924] ffff8801d9287bd8 0000000000000001 ffff8801d9287a00 ffffffff8150ad13 [ 33.850907] 00003ffe332001e0 00003ffe332001e0 0000000041b58ab3 ffffffff841ef837 [ 33.858895] ffffffff8150ab10 00000000000004f0 ffff8801d1987f20 ffff8801d92879c8 [ 33.866908] Call Trace: [ 33.869479] [] zap_huge_pmd+0x203/0x510 [ 33.875092] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 33.881648] [] unmap_single_vma+0xea3/0x1240 [ 33.887681] [] ? vm_normal_page+0x280/0x280 [ 33.893626] [] ? __put_single_page+0x60/0x60 [ 33.899662] [] unmap_vmas+0x81/0xd0 [ 33.904915] [] exit_mmap+0x1c9/0x3a0 [ 33.910270] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.916745] [] ? up_write+0x1a/0x60 [ 33.922003] [] mmput+0xf8/0x2d0 [ 33.926923] [] do_exit+0x8d8/0x26b0 [ 33.932191] [] ? file_map_prot_check+0x193/0x310 [ 33.938575] [] ? release_task.part.17+0x1200/0x1200 [ 33.945219] [] ? SyS_mprotect+0x41e/0x640 [ 33.951037] [] ? up_write+0x1a/0x60 [ 33.956292] [] ? SyS_mprotect+0x423/0x640 [ 33.962116] [] do_group_exit+0x111/0x330 [ 33.967806] [] ? do_group_exit+0x330/0x330 [ 33.973677] [] SyS_exit_group+0x1d/0x20 [ 33.979278] [] do_fast_syscall_32+0x324/0x8b0 [ 33.985396] [] sysenter_flags_fixed+0xd/0x1a [ 33.991424] 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 [ 34.018241] RIP [] page_remove_rmap+0x2e/0x260 [ 34.024593] RSP [ 34.028196] CR2: ffffeafff8cc8008 [ 34.031621] ---[ end trace 462a4143c20352fa ]--- [ 34.036367] Kernel panic - not syncing: Fatal exception [ 34.042078] Dumping ftrace buffer: [ 34.045598] (ftrace buffer empty) [ 34.049282] Kernel Offset: disabled [ 34.052883] Rebooting in 86400 seconds..