[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.666246] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 22.092419] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.388931] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.107318] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) [ 23.280748] random: sshd: uninitialized urandom read (32 bytes read, 70 bits of entropy available) Warning: Permanently added '10.128.0.31' (ECDSA) to the list of known hosts. [ 28.877759] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 28.967704] BUG: unable to handle kernel paging request at ffffeafffd2d8008 [ 28.975055] IP: [] page_remove_rmap+0x2e/0x260 [ 28.981302] PGD 0 [ 28.983542] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.988767] Dumping ftrace buffer: [ 28.992279] (ftrace buffer empty) [ 28.995971] Modules linked in: [ 28.999274] CPU: 1 PID: 3832 Comm: syz-executor070 Not tainted 4.4.149-gf76bdbd #18 [ 29.007086] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.016417] task: ffff8801d9693000 task.stack: ffff8801d9278000 [ 29.022465] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.031142] RSP: 0018:ffff8801d927f948 EFLAGS: 00010246 [ 29.036566] RAX: dffffc0000000000 RBX: ffffeafffd2d8000 RCX: 0000000000000000 [ 29.043849] RDX: 1ffffd5fffa5b001 RSI: ffffffff814bc8bf RDI: ffffeafffd2d8008 [ 29.051107] RBP: ffff8801d927f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.058352] R10: 0000000000000001 R11: ffff8801d9693000 R12: 0000000000000001 [ 29.065601] R13: 1ffff1003b24ff2f R14: ffff8801cb312800 R15: ffffeafffd2d8000 [ 29.072885] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.081112] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.086969] CR2: ffffeafffd2d8008 CR3: 00000001cb0c5000 CR4: 00000000001606f0 [ 29.094216] Stack: [ 29.096339] ffff8801d927fbd8 0000000000000001 ffff8801d927fa00 ffffffff8150a443 [ 29.104402] 00003fff4b6001e0 00003fff4b6001e0 0000000041b58ab3 ffffffff841ef837 [ 29.112394] ffffffff8150a240 00000000000004f0 ffff8801cc471e18 ffff8801d927f9c8 [ 29.120895] Call Trace: [ 29.123467] [] zap_huge_pmd+0x203/0x510 [ 29.129081] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.135638] [] unmap_single_vma+0xea3/0x1240 [ 29.141676] [] ? vm_normal_page+0x230/0x230 [ 29.147646] [] ? __put_single_page+0x60/0x60 [ 29.153681] [] unmap_vmas+0x81/0xd0 [ 29.158939] [] exit_mmap+0x1c9/0x3a0 [ 29.164280] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.170750] [] ? up_write+0x1a/0x60 [ 29.176007] [] mmput+0xf8/0x2d0 [ 29.180933] [] do_exit+0x8d8/0x26b0 [ 29.186206] [] ? file_map_prot_check+0x193/0x310 [ 29.192588] [] ? release_task.part.17+0x1200/0x1200 [ 29.199282] [] ? SyS_mprotect+0x41e/0x640 [ 29.205077] [] ? up_write+0x1a/0x60 [ 29.210328] [] ? SyS_mprotect+0x423/0x640 [ 29.216099] [] do_group_exit+0x111/0x330 [ 29.221801] [] ? do_group_exit+0x330/0x330 [ 29.227662] [] SyS_exit_group+0x1d/0x20 [ 29.233289] [] do_fast_syscall_32+0x324/0x8b0 [ 29.239411] [] sysenter_flags_fixed+0xd/0x1a [ 29.245441] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 29.272460] RIP [] page_remove_rmap+0x2e/0x260 [ 29.278795] RSP [ 29.282394] CR2: ffffeafffd2d8008 [ 29.285837] ---[ end trace e3e32cd2e36555f4 ]--- [ 29.290566] Kernel panic - not syncing: Fatal exception [ 29.296219] Dumping ftrace buffer: [ 29.299764] (ftrace buffer empty) [ 29.303450] Kernel Offset: disabled [ 29.307067] Rebooting in 86400 seconds..