[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.487070] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 26.853082] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 27.391814] random: sshd: uninitialized urandom read (32 bytes read, 40 bits of entropy available) [ 28.182529] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 28.359738] random: sshd: uninitialized urandom read (32 bytes read, 77 bits of entropy available) Warning: Permanently added '10.128.0.3' (ECDSA) to the list of known hosts. [ 33.897458] random: sshd: uninitialized urandom read (32 bytes read, 83 bits of entropy available) executing program [ 33.990675] BUG: unable to handle kernel paging request at ffffeafffd448008 [ 33.998027] IP: [] page_remove_rmap+0x2e/0x260 [ 34.004291] PGD 0 [ 34.006547] Oops: 0000 [#1] PREEMPT SMP KASAN [ 34.011521] Dumping ftrace buffer: [ 34.015051] (ftrace buffer empty) [ 34.018753] Modules linked in: [ 34.022039] CPU: 0 PID: 3856 Comm: syz-executor163 Not tainted 4.4.148-gf057ff9 #81 [ 34.029812] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.039145] task: ffff8800abb50000 task.stack: ffff8800abad8000 [ 34.045178] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 34.053858] RSP: 0018:ffff8800abadf9c0 EFLAGS: 00010246 [ 34.059280] RAX: dffffc0000000000 RBX: ffffeafffd448000 RCX: 0000000000000000 [ 34.066527] RDX: 1ffffd5fffa89001 RSI: ffffffff814bc75f RDI: ffffeafffd448008 [ 34.073770] RBP: ffff8800abadf9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 34.081027] R10: 0000000000000001 R11: ffff8800abb50000 R12: 0000000000000001 [ 34.088274] R13: 1ffff1001575bf3e R14: ffff8800b18d8800 R15: ffffeafffd448000 [ 34.095531] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 34.103733] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.109590] CR2: ffffeafffd448008 CR3: 00000000ae26c000 CR4: 00000000001606f0 [ 34.116833] Stack: [ 34.119003] ffff8800abadfc50 0000000000000001 ffff8800abadfa78 ffffffff8150a1f3 [ 34.126995] 00003fff512001e0 00003fff512001e0 0000000041b58ab3 ffffffff841ef82f [ 34.135017] ffffffff81509ff0 00000000000004f0 ffff8801cb36bf78 ffff8800abadfa40 [ 34.143003] Call Trace: [ 34.145579] [] zap_huge_pmd+0x203/0x510 [ 34.151178] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 34.157732] [] unmap_single_vma+0xea3/0x1240 [ 34.163772] [] ? vm_normal_page+0x230/0x230 [ 34.169721] [] ? __put_single_page+0x60/0x60 [ 34.175752] [] unmap_vmas+0x81/0xd0 [ 34.181003] [] exit_mmap+0x1c9/0x3a0 [ 34.186340] [] ? SyS_remap_file_pages+0x870/0x870 [ 34.192808] [] ? up_write+0x1a/0x60 [ 34.198063] [] mmput+0xf8/0x2d0 [ 34.202970] [] do_exit+0x8d8/0x26b0 [ 34.208228] [] ? file_map_prot_check+0x193/0x310 [ 34.214648] [] ? release_task.part.17+0x1200/0x1200 [ 34.221298] [] ? SyS_mprotect+0x41e/0x640 [ 34.227379] [] ? up_write+0x1a/0x60 [ 34.232631] [] ? SyS_mprotect+0x423/0x640 [ 34.238422] [] do_group_exit+0x111/0x330 [ 34.244112] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 34.250576] [] SyS_exit_group+0x1d/0x20 [ 34.256176] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 34.262726] 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 [ 34.289686] RIP [] page_remove_rmap+0x2e/0x260 [ 34.296013] RSP [ 34.299646] CR2: ffffeafffd448008 [ 34.303074] ---[ end trace a960dd922ef1fb8b ]--- [ 34.307802] Kernel panic - not syncing: Fatal exception [ 34.313426] Dumping ftrace buffer: [ 34.316950] (ftrace buffer empty) [ 34.320636] Kernel Offset: disabled [ 34.324243] Rebooting in 86400 seconds..