[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.210792] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.078613] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.371599] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.106352] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 22.286817] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) Warning: Permanently added '10.128.10.28' (ECDSA) to the list of known hosts. [ 27.887105] random: sshd: uninitialized urandom read (32 bytes read, 85 bits of entropy available) executing program [ 27.978420] BUG: unable to handle kernel paging request at ffffeafffd2f8008 [ 27.985784] IP: [] page_remove_rmap+0x2e/0x260 [ 27.992060] PGD 0 [ 27.994392] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.999348] Dumping ftrace buffer: [ 28.002895] (ftrace buffer empty) [ 28.006583] Modules linked in: [ 28.009875] CPU: 1 PID: 3831 Comm: syz-executor471 Not tainted 4.4.150-g5541782 #83 [ 28.017641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.026970] task: ffff8801d2ca4800 task.stack: ffff8800bb058000 [ 28.033014] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.041689] RSP: 0018:ffff8800bb05f9c0 EFLAGS: 00010246 [ 28.047110] RAX: dffffc0000000000 RBX: ffffeafffd2f8000 RCX: 0000000000000000 [ 28.054367] RDX: 1ffffd5fffa5f001 RSI: ffffffff814bceaf RDI: ffffeafffd2f8008 [ 28.061626] RBP: ffff8800bb05f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.068887] R10: 0000000000000001 R11: ffff8801d2ca4800 R12: 0000000000000001 [ 28.076133] R13: 1ffff1001760bf3e R14: ffff8800b351d800 R15: ffffeafffd2f8000 [ 28.083382] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.091583] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.097437] CR2: ffffeafffd2f8008 CR3: 00000000b44cb000 CR4: 00000000001606f0 [ 28.104682] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.111927] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.119168] Stack: [ 28.121291] ffff8800bb05fc50 0000000000000001 ffff8800bb05fa78 ffffffff8150ad13 [ 28.129283] 00003fff4be001e0 00003fff4be001e0 0000000041b58ab3 ffffffff841ef837 [ 28.137275] ffffffff8150ab10 00000000000004f0 ffff8800b36969f8 ffff8800bb05fa40 [ 28.145283] Call Trace: [ 28.147848] [] zap_huge_pmd+0x203/0x510 [ 28.153455] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.160108] [] unmap_single_vma+0xea3/0x1240 [ 28.166148] [] ? vm_normal_page+0x280/0x280 [ 28.172102] [] ? __put_single_page+0x60/0x60 [ 28.178139] [] unmap_vmas+0x81/0xd0 [ 28.183395] [] exit_mmap+0x1c9/0x3a0 [ 28.188736] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.195207] [] ? up_write+0x1a/0x60 [ 28.200481] [] mmput+0xf8/0x2d0 [ 28.205394] [] do_exit+0x8d8/0x26b0 [ 28.210649] [] ? file_map_prot_check+0x193/0x310 [ 28.217030] [] ? release_task.part.17+0x1200/0x1200 [ 28.223677] [] ? SyS_mprotect+0x41e/0x640 [ 28.229450] [] ? up_write+0x1a/0x60 [ 28.234704] [] ? SyS_mprotect+0x423/0x640 [ 28.240488] [] do_group_exit+0x111/0x330 [ 28.246181] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.252650] [] SyS_exit_group+0x1d/0x20 [ 28.258253] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.264805] 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 [ 28.291783] RIP [] page_remove_rmap+0x2e/0x260 [ 28.298127] RSP [ 28.301727] CR2: ffffeafffd2f8008 [ 28.305161] ---[ end trace b46b0e11d3302d8f ]--- [ 28.309894] Kernel panic - not syncing: Fatal exception [ 28.315574] Dumping ftrace buffer: [ 28.319096] (ftrace buffer empty) [ 28.322779] Kernel Offset: disabled [ 28.326381] Rebooting in 86400 seconds..