[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.980928] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.251713] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 22.641996] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.246502] random: sshd: uninitialized urandom read (32 bytes read, 50 bits of entropy available) [ 23.429870] random: sshd: uninitialized urandom read (32 bytes read, 53 bits of entropy available) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 28.960239] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) executing program [ 29.047458] BUG: unable to handle kernel paging request at ffffeafffd3e8008 [ 29.054850] IP: [] page_remove_rmap+0x2e/0x260 [ 29.061097] PGD 0 [ 29.063337] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.068278] Dumping ftrace buffer: [ 29.071791] (ftrace buffer empty) [ 29.075482] Modules linked in: [ 29.078785] CPU: 1 PID: 3712 Comm: syz-executor688 Not tainted 4.4.150-g5541782 #83 [ 29.086548] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.095874] task: ffff8801ce114800 task.stack: ffff8800b1aa8000 [ 29.101900] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.110582] RSP: 0018:ffff8800b1aaf9c0 EFLAGS: 00010246 [ 29.116031] RAX: dffffc0000000000 RBX: ffffeafffd3e8000 RCX: ffffea0007318000 [ 29.123275] RDX: 1ffffd5fffa7d001 RSI: ffffffff814bceaf RDI: ffffeafffd3e8008 [ 29.130518] RBP: ffff8800b1aaf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.137762] R10: 0000000000000001 R11: ffff8801ce114800 R12: 0000000000000001 [ 29.145004] R13: 1ffff10016355f3e R14: ffff8800b512a800 R15: ffffeafffd3e8000 [ 29.152250] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.160507] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.166361] CR2: ffffeafffd3e8008 CR3: 00000000b50b6000 CR4: 00000000001606f0 [ 29.173609] Stack: [ 29.175731] ffff8800b1aafc50 0000000000000001 ffff8800b1aafa78 ffffffff8150ad13 [ 29.183726] 00003fff4fa001e0 00003fff4fa001e0 0000000041b58ab3 ffffffff841ef837 [ 29.191716] ffffffff8150ab10 00000000000004f0 ffff8800b2e85aa8 ffff8800b1aafa40 [ 29.199707] Call Trace: [ 29.202286] [] zap_huge_pmd+0x203/0x510 [ 29.207884] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.214436] [] unmap_single_vma+0xea3/0x1240 [ 29.220466] [] ? vm_normal_page+0x280/0x280 [ 29.226478] [] ? __put_single_page+0x60/0x60 [ 29.232540] [] unmap_vmas+0x81/0xd0 [ 29.237791] [] exit_mmap+0x1c9/0x3a0 [ 29.243129] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.249595] [] ? up_write+0x1a/0x60 [ 29.254846] [] mmput+0xf8/0x2d0 [ 29.259744] [] do_exit+0x8d8/0x26b0 [ 29.264993] [] ? file_map_prot_check+0x193/0x310 [ 29.271373] [] ? release_task.part.17+0x1200/0x1200 [ 29.278025] [] ? SyS_mprotect+0x41e/0x640 [ 29.283798] [] ? up_write+0x1a/0x60 [ 29.289046] [] ? SyS_mprotect+0x423/0x640 [ 29.294816] [] do_group_exit+0x111/0x330 [ 29.300500] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 29.306978] [] SyS_exit_group+0x1d/0x20 [ 29.312580] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 29.319126] 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 [ 29.345906] RIP [] page_remove_rmap+0x2e/0x260 [ 29.352259] RSP [ 29.355857] CR2: ffffeafffd3e8008 [ 29.359284] ---[ end trace 9b8ccaca45d096e8 ]--- [ 29.364095] Kernel panic - not syncing: Fatal exception [ 29.369769] Dumping ftrace buffer: [ 29.373291] (ftrace buffer empty) [ 29.376975] Kernel Offset: disabled [ 29.380572] Rebooting in 86400 seconds..