[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.706076] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.476662] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.833970] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.531768] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) [ 25.699532] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 31.218294] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) executing program [ 31.303825] BUG: unable to handle kernel paging request at ffffeafff8da8008 [ 31.311174] IP: [] page_remove_rmap+0x2e/0x260 [ 31.317419] PGD 0 [ 31.319665] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.324654] Dumping ftrace buffer: [ 31.328169] (ftrace buffer empty) [ 31.331855] Modules linked in: [ 31.335222] CPU: 0 PID: 3797 Comm: syz-executor273 Not tainted 4.4.150-g5541782 #19 [ 31.342993] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.352336] task: ffff8800af1f1800 task.stack: ffff8801c9ca8000 [ 31.358478] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.367160] RSP: 0018:ffff8801c9caf948 EFLAGS: 00010246 [ 31.372583] RAX: dffffc0000000000 RBX: ffffeafff8da8000 RCX: 0000000000000000 [ 31.379948] RDX: 1ffffd5fff1b5001 RSI: ffffffff814bceaf RDI: ffffeafff8da8008 [ 31.387327] RBP: ffff8801c9caf958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.394692] R10: 0000000000000001 R11: ffff8800af1f1800 R12: 0000000000000001 [ 31.401939] R13: 1ffff10039395f2f R14: ffff8801d1a65800 R15: ffffeafff8da8000 [ 31.409191] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.417395] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.423253] CR2: ffffeafff8da8008 CR3: 00000001d0c53000 CR4: 00000000001606f0 [ 31.430502] Stack: [ 31.432634] ffff8801c9cafbd8 0000000000000001 ffff8801c9cafa00 ffffffff8150ad13 [ 31.440681] 00003ffe36a001e0 00003ffe36a001e0 0000000041b58ab3 ffffffff841ef837 [ 31.448732] ffffffff8150ab10 00000000000004f0 ffff8801d23a91b8 ffff8801c9caf9c8 [ 31.456779] Call Trace: [ 31.459464] [] zap_huge_pmd+0x203/0x510 [ 31.465121] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.471683] [] unmap_single_vma+0xea3/0x1240 [ 31.477720] [] ? vm_normal_page+0x280/0x280 [ 31.483669] [] ? __put_single_page+0x60/0x60 [ 31.489761] [] unmap_vmas+0x81/0xd0 [ 31.495019] [] exit_mmap+0x1c9/0x3a0 [ 31.500366] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.506841] [] ? kmem_cache_free+0x2b4/0x340 [ 31.512879] [] mmput+0xf8/0x2d0 [ 31.517789] [] do_exit+0x8d8/0x26b0 [ 31.523045] [] ? file_map_prot_check+0x193/0x310 [ 31.529480] [] ? release_task.part.17+0x1200/0x1200 [ 31.536130] [] ? SyS_mprotect+0x41e/0x640 [ 31.541905] [] ? up_write+0x1a/0x60 [ 31.547156] [] ? SyS_mprotect+0x423/0x640 [ 31.553026] [] do_group_exit+0x111/0x330 [ 31.558723] [] ? do_group_exit+0x330/0x330 [ 31.564585] [] SyS_exit_group+0x1d/0x20 [ 31.570249] [] do_fast_syscall_32+0x324/0x8b0 [ 31.576446] [] sysenter_flags_fixed+0xd/0x1a [ 31.582623] 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 [ 31.609800] RIP [] page_remove_rmap+0x2e/0x260 [ 31.616142] RSP [ 31.619741] CR2: ffffeafff8da8008 [ 31.623170] ---[ end trace ff01b1ecd75bbf57 ]--- [ 31.627896] Kernel panic - not syncing: Fatal exception [ 31.633546] Dumping ftrace buffer: [ 31.637068] (ftrace buffer empty) [ 31.640751] Kernel Offset: disabled [ 31.644348] Rebooting in 86400 seconds..