[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.982356] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 27.347072] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.888803] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.613479] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 28.778420] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts. [ 34.316413] random: sshd: uninitialized urandom read (32 bytes read, 81 bits of entropy available) executing program [ 34.409003] BUG: unable to handle kernel paging request at ffffeafffd510008 [ 34.416363] IP: [] page_remove_rmap+0x2e/0x260 [ 34.422615] PGD 0 [ 34.424868] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.429851] Dumping ftrace buffer: [ 34.433362] (ftrace buffer empty) [ 34.437042] Modules linked in: [ 34.440325] CPU: 1 PID: 3849 Comm: syz-executor303 Not tainted 4.4.148-gf057ff9 #81 [ 34.448087] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.457415] task: ffff8800b7288000 task.stack: ffff8800bbb08000 [ 34.463448] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.472170] RSP: 0018:ffff8800bbb0f9c0 EFLAGS: 00010246 [ 34.477604] RAX: dffffc0000000000 RBX: ffffeafffd510000 RCX: ffffea0002ae8000 [ 34.484849] RDX: 1ffffd5fffaa2001 RSI: ffffffff814bc75f RDI: ffffeafffd510008 [ 34.492093] RBP: ffff8800bbb0f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.499335] R10: 0000000000000001 R11: ffff8800b7288000 R12: 0000000000000001 [ 34.506579] R13: 1ffff10017761f3e R14: ffff8800bb9c5810 R15: ffffeafffd510000 [ 34.513841] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 34.522042] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.527896] CR2: ffffeafffd510008 CR3: 00000000bb9c1000 CR4: 00000000001606f0 [ 34.535156] Stack: [ 34.537297] ffff8800bbb0fc50 0000000000000001 ffff8800bbb0fa78 ffffffff8150a1f3 [ 34.545284] 00003fff544001a0 00003fff544001a0 0000000041b58ab3 ffffffff841ef82f [ 34.553271] ffffffff81509ff0 00000000000004f0 ffff8800b3948580 ffff8800bbb0fa40 [ 34.561275] Call Trace: [ 34.563839] [] zap_huge_pmd+0x203/0x510 [ 34.569437] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.575993] [] unmap_single_vma+0xea3/0x1240 [ 34.582025] [] ? vm_normal_page+0x230/0x230 [ 34.587988] [] ? __put_single_page+0x60/0x60 [ 34.594017] [] unmap_vmas+0x81/0xd0 [ 34.599270] [] exit_mmap+0x1c9/0x3a0 [ 34.604607] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.611073] [] ? up_write+0x1a/0x60 [ 34.616324] [] mmput+0xf8/0x2d0 [ 34.621228] [] do_exit+0x8d8/0x26b0 [ 34.626481] [] ? file_map_prot_check+0x193/0x310 [ 34.632869] [] ? release_task.part.17+0x1200/0x1200 [ 34.639508] [] ? SyS_mprotect+0x41e/0x640 [ 34.645294] [] ? up_write+0x1a/0x60 [ 34.650545] [] ? SyS_mprotect+0x423/0x640 [ 34.656317] [] do_group_exit+0x111/0x330 [ 34.661999] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.668463] [] SyS_exit_group+0x1d/0x20 [ 34.674062] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.680608] 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 [ 34.707504] RIP [] page_remove_rmap+0x2e/0x260 [ 34.713843] RSP [ 34.717463] CR2: ffffeafffd510008 [ 34.720890] ---[ end trace c1d31235a51c7c78 ]--- [ 34.725614] Kernel panic - not syncing: Fatal exception [ 34.731270] Dumping ftrace buffer: [ 34.734788] (ftrace buffer empty) [ 34.738473] Kernel Offset: disabled [ 34.742093] Rebooting in 86400 seconds..