[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.963230] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.713081] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.123341] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 26.796874] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) [ 26.959370] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 32.567406] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 32.653402] BUG: unable to handle kernel paging request at ffffeafff8ce8008 [ 32.660796] IP: [] page_remove_rmap+0x2e/0x260 [ 32.667055] PGD 0 [ 32.669296] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.674281] Dumping ftrace buffer: [ 32.677795] (ftrace buffer empty) [ 32.681482] Modules linked in: [ 32.684772] CPU: 1 PID: 3840 Comm: syz-executor434 Not tainted 4.4.150-g5541782 #19 [ 32.692561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.701913] task: ffff8801d968e000 task.stack: ffff8800aeb48000 [ 32.707945] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.716646] RSP: 0018:ffff8800aeb4f948 EFLAGS: 00010246 [ 32.722069] RAX: dffffc0000000000 RBX: ffffeafff8ce8000 RCX: 0000000000000000 [ 32.729315] RDX: 1ffffd5fff19d001 RSI: ffffffff814bceaf RDI: ffffeafff8ce8008 [ 32.736561] RBP: ffff8800aeb4f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.743811] R10: 0000000000000001 R11: ffff8801d968e000 R12: 0000000000000001 [ 32.751071] R13: 1ffff10015d69f2f R14: ffff8801c7e88800 R15: ffffeafff8ce8000 [ 32.758330] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.766530] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.772410] CR2: ffffeafff8ce8008 CR3: 00000001cca16000 CR4: 00000000001606f0 [ 32.779674] Stack: [ 32.781820] ffff8800aeb4fbd8 0000000000000001 ffff8800aeb4fa00 ffffffff8150ad13 [ 32.789826] 00003ffe33a001e0 00003ffe33a001e0 0000000041b58ab3 ffffffff841ef837 [ 32.797826] ffffffff8150ab10 00000000000004f0 ffff8800accbcec8 ffff8800aeb4f9c8 [ 32.805839] Call Trace: [ 32.808404] [] zap_huge_pmd+0x203/0x510 [ 32.814008] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.820565] [] unmap_single_vma+0xea3/0x1240 [ 32.826601] [] ? vm_normal_page+0x280/0x280 [ 32.832567] [] ? __put_single_page+0x60/0x60 [ 32.838604] [] unmap_vmas+0x81/0xd0 [ 32.843885] [] exit_mmap+0x1c9/0x3a0 [ 32.849225] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.855695] [] ? up_write+0x1a/0x60 [ 32.860951] [] mmput+0xf8/0x2d0 [ 32.865859] [] do_exit+0x8d8/0x26b0 [ 32.871118] [] ? file_map_prot_check+0x193/0x310 [ 32.877521] [] ? release_task.part.17+0x1200/0x1200 [ 32.884165] [] ? SyS_mprotect+0x41e/0x640 [ 32.889942] [] ? up_write+0x1a/0x60 [ 32.895195] [] ? SyS_mprotect+0x423/0x640 [ 32.900971] [] do_group_exit+0x111/0x330 [ 32.906675] [] ? do_group_exit+0x330/0x330 [ 32.912535] [] SyS_exit_group+0x1d/0x20 [ 32.918155] [] do_fast_syscall_32+0x324/0x8b0 [ 32.924277] [] sysenter_flags_fixed+0xd/0x1a [ 32.930319] 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 [ 32.957651] RIP [] page_remove_rmap+0x2e/0x260 [ 32.963980] RSP [ 32.967580] CR2: ffffeafff8ce8008 [ 32.971010] ---[ end trace 0863b11c2056f36e ]--- [ 32.975737] Kernel panic - not syncing: Fatal exception [ 32.981371] Dumping ftrace buffer: [ 32.984889] (ftrace buffer empty) [ 32.988575] Kernel Offset: disabled [ 32.992176] Rebooting in 86400 seconds..