[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.783539] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 20.397017] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.677374] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.318111] random: sshd: uninitialized urandom read (32 bytes read, 55 bits of entropy available) [ 21.501253] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. [ 26.991067] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) executing program [ 27.079846] BUG: unable to handle kernel paging request at ffffeafff8cf8008 [ 27.087173] IP: [] page_remove_rmap+0x2e/0x260 [ 27.093423] PGD 0 [ 27.095696] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.100642] Dumping ftrace buffer: [ 27.104169] (ftrace buffer empty) [ 27.107869] Modules linked in: [ 27.111156] CPU: 0 PID: 3709 Comm: syz-executor688 Not tainted 4.4.149-gf76bdbd #18 [ 27.118937] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.128277] task: ffff8801ce0c1800 task.stack: ffff8800b2330000 [ 27.134305] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.142970] RSP: 0018:ffff8800b2337948 EFLAGS: 00010246 [ 27.148406] RAX: dffffc0000000000 RBX: ffffeafff8cf8000 RCX: 0000000000000000 [ 27.155649] RDX: 1ffffd5fff19f001 RSI: ffffffff814bc8bf RDI: ffffeafff8cf8008 [ 27.162892] RBP: ffff8800b2337958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.170149] R10: 0000000000000001 R11: ffff8801ce0c1800 R12: 0000000000000001 [ 27.177394] R13: 1ffff10016466f2f R14: ffff8801d210d800 R15: ffffeafff8cf8000 [ 27.184636] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.192842] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.198701] CR2: ffffeafff8cf8008 CR3: 00000001ce221000 CR4: 00000000001606f0 [ 27.205943] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.213200] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.220441] Stack: [ 27.222559] ffff8800b2337bd8 0000000000000001 ffff8800b2337a00 ffffffff8150a443 [ 27.230534] 00003ffe33e001e0 00003ffe33e001e0 0000000041b58ab3 ffffffff841ef837 [ 27.238533] ffffffff8150a240 00000000000004f0 ffff8800b5b859a0 ffff8800b23379c8 [ 27.246506] Call Trace: [ 27.249069] [] zap_huge_pmd+0x203/0x510 [ 27.254668] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.261222] [] unmap_single_vma+0xea3/0x1240 [ 27.267251] [] ? vm_normal_page+0x230/0x230 [ 27.273200] [] ? __put_single_page+0x60/0x60 [ 27.279248] [] unmap_vmas+0x81/0xd0 [ 27.284513] [] exit_mmap+0x1c9/0x3a0 [ 27.289848] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.296316] [] ? up_write+0x1a/0x60 [ 27.301570] [] mmput+0xf8/0x2d0 [ 27.306471] [] do_exit+0x8d8/0x26b0 [ 27.311725] [] ? file_map_prot_check+0x193/0x310 [ 27.318109] [] ? release_task.part.17+0x1200/0x1200 [ 27.324747] [] ? SyS_mprotect+0x41e/0x640 [ 27.330516] [] ? up_write+0x1a/0x60 [ 27.335766] [] ? SyS_mprotect+0x423/0x640 [ 27.341537] [] do_group_exit+0x111/0x330 [ 27.347224] [] ? do_group_exit+0x330/0x330 [ 27.353081] [] SyS_exit_group+0x1d/0x20 [ 27.358687] [] do_fast_syscall_32+0x324/0x8b0 [ 27.364820] [] sysenter_flags_fixed+0xd/0x1a [ 27.370848] 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 [ 27.397923] RIP [] page_remove_rmap+0x2e/0x260 [ 27.404250] RSP [ 27.407866] CR2: ffffeafff8cf8008 [ 27.411299] ---[ end trace 8387d5a1df8d6af4 ]--- [ 27.416024] Kernel panic - not syncing: Fatal exception [ 27.421699] Dumping ftrace buffer: [ 27.425218] (ftrace buffer empty) [ 27.428917] Kernel Offset: disabled [ 27.432517] Rebooting in 86400 seconds..