[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.304187] 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: [ 25.961000] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 26.423539] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 27.033351] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 27.206753] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.0.7' (ECDSA) to the list of known hosts. [ 32.743444] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 32.829804] BUG: unable to handle kernel paging request at ffffeafff8c80008 [ 32.837172] IP: [] page_remove_rmap+0x2e/0x260 [ 32.843419] PGD 0 [ 32.845691] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.850637] Dumping ftrace buffer: [ 32.854149] (ftrace buffer empty) [ 32.857832] Modules linked in: [ 32.861117] CPU: 1 PID: 3850 Comm: syz-executor943 Not tainted 4.4.148-gf057ff9 #81 [ 32.868881] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.878213] task: ffff8800b1aee000 task.stack: ffff8801d9b50000 [ 32.884254] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 32.892933] RSP: 0018:ffff8801d9b579c0 EFLAGS: 00010246 [ 32.898361] RAX: dffffc0000000000 RBX: ffffeafff8c80000 RCX: 0000000000000000 [ 32.905607] RDX: 1ffffd5fff190001 RSI: ffffffff814bc75f RDI: ffffeafff8c80008 [ 32.912854] RBP: ffff8801d9b579d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.920105] R10: 0000000000000001 R11: ffff8800b1aee000 R12: 0000000000000001 [ 32.927351] R13: 1ffff1003b36af3e R14: ffff8801caf92800 R15: ffffeafff8c80000 [ 32.934596] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.942794] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.948648] CR2: ffffeafff8c80008 CR3: 00000001d277e000 CR4: 00000000001606f0 [ 32.955908] Stack: [ 32.958029] ffff8801d9b57c50 0000000000000001 ffff8801d9b57a78 ffffffff8150a1f3 [ 32.966033] 00003ffe320001e0 00003ffe320001e0 0000000041b58ab3 ffffffff841ef82f [ 32.974058] ffffffff81509ff0 00000000000004f0 ffff8801d0fdd3c8 ffff8801d9b57a40 [ 32.982056] Call Trace: [ 32.984619] [] zap_huge_pmd+0x203/0x510 [ 32.990250] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.996919] [] unmap_single_vma+0xea3/0x1240 [ 33.002970] [] ? vm_normal_page+0x230/0x230 [ 33.008918] [] ? __put_single_page+0x60/0x60 [ 33.014967] [] unmap_vmas+0x81/0xd0 [ 33.020221] [] exit_mmap+0x1c9/0x3a0 [ 33.025567] [] ? SyS_remap_file_pages+0x870/0x870 [ 33.032056] [] ? up_write+0x1a/0x60 [ 33.037390] [] mmput+0xf8/0x2d0 [ 33.042387] [] do_exit+0x8d8/0x26b0 [ 33.047650] [] ? file_map_prot_check+0x193/0x310 [ 33.054040] [] ? release_task.part.17+0x1200/0x1200 [ 33.060682] [] ? SyS_mprotect+0x41e/0x640 [ 33.066736] [] ? up_write+0x1a/0x60 [ 33.072000] [] ? SyS_mprotect+0x423/0x640 [ 33.077822] [] do_group_exit+0x111/0x330 [ 33.083519] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 33.089990] [] SyS_exit_group+0x1d/0x20 [ 33.095594] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 33.102146] 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 [ 33.129117] RIP [] page_remove_rmap+0x2e/0x260 [ 33.135456] RSP [ 33.139055] CR2: ffffeafff8c80008 [ 33.142485] ---[ end trace d6c0834303352684 ]--- [ 33.147218] Kernel panic - not syncing: Fatal exception [ 33.152871] Dumping ftrace buffer: [ 33.156396] (ftrace buffer empty) [ 33.160187] Kernel Offset: disabled [ 33.163792] Rebooting in 86400 seconds..