[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.592162] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.927079] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 22.277899] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.932722] random: sshd: uninitialized urandom read (32 bytes read, 52 bits of entropy available) [ 23.110455] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 28.781204] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) executing program [ 28.873457] BUG: unable to handle kernel paging request at ffffeafff8d10008 [ 28.880820] IP: [] page_remove_rmap+0x2e/0x260 [ 28.887074] PGD 0 [ 28.889321] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.894271] Dumping ftrace buffer: [ 28.897788] (ftrace buffer empty) [ 28.901475] Modules linked in: [ 28.904768] CPU: 1 PID: 3728 Comm: syz-executor157 Not tainted 4.4.150-g5541782 #83 [ 28.912536] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.921867] task: ffff8800b2219800 task.stack: ffff8800b1750000 [ 28.927898] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.936583] RSP: 0018:ffff8800b17579c0 EFLAGS: 00010246 [ 28.942009] RAX: dffffc0000000000 RBX: ffffeafff8d10000 RCX: 0000000000000000 [ 28.949273] RDX: 1ffffd5fff1a2001 RSI: ffffffff814bceaf RDI: ffffeafff8d10008 [ 28.956536] RBP: ffff8800b17579d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.963785] R10: 0000000000000001 R11: ffff8800b2219800 R12: 0000000000000001 [ 28.971033] R13: 1ffff100162eaf3e R14: ffff8801cfe05800 R15: ffffeafff8d10000 [ 28.978281] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.986482] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.992358] CR2: ffffeafff8d10008 CR3: 00000001cfee3000 CR4: 00000000001606f0 [ 28.999693] Stack: [ 29.001824] ffff8800b1757c50 0000000000000001 ffff8800b1757a78 ffffffff8150ad13 [ 29.009823] 00003ffe344001e0 00003ffe344001e0 0000000041b58ab3 ffffffff841ef837 [ 29.018226] ffffffff8150ab10 00000000000004f0 ffff8801ccd56528 ffff8800b1757a40 [ 29.026259] Call Trace: [ 29.028826] [] zap_huge_pmd+0x203/0x510 [ 29.034450] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.041008] [] unmap_single_vma+0xea3/0x1240 [ 29.047042] [] ? vm_normal_page+0x280/0x280 [ 29.052991] [] ? __put_single_page+0x60/0x60 [ 29.059025] [] unmap_vmas+0x81/0xd0 [ 29.064281] [] exit_mmap+0x1c9/0x3a0 [ 29.069640] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.076116] [] ? up_write+0x1a/0x60 [ 29.081391] [] mmput+0xf8/0x2d0 [ 29.086299] [] do_exit+0x8d8/0x26b0 [ 29.091571] [] ? file_map_prot_check+0x193/0x310 [ 29.097970] [] ? release_task.part.17+0x1200/0x1200 [ 29.104634] [] ? SyS_mprotect+0x41e/0x640 [ 29.110411] [] ? up_write+0x1a/0x60 [ 29.115665] [] ? SyS_mprotect+0x423/0x640 [ 29.121451] [] do_group_exit+0x111/0x330 [ 29.127137] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.133612] [] SyS_exit_group+0x1d/0x20 [ 29.139219] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.145768] 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 [ 29.172757] RIP [] page_remove_rmap+0x2e/0x260 [ 29.179089] RSP [ 29.182689] CR2: ffffeafff8d10008 [ 29.186120] ---[ end trace a3976ebdd63ea36f ]--- [ 29.190848] Kernel panic - not syncing: Fatal exception [ 29.196493] Dumping ftrace buffer: [ 29.200023] (ftrace buffer empty) [ 29.203709] Kernel Offset: disabled [ 29.207333] Rebooting in 86400 seconds..