[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.610958] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.630344] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.946636] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 25.607238] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) [ 25.781264] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Warning: Permanently added '10.128.0.46' (ECDSA) to the list of known hosts. [ 31.433474] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 31.530905] BUG: unable to handle kernel paging request at ffffeafffd458008 [ 31.538291] IP: [] page_remove_rmap+0x2e/0x260 [ 31.544540] PGD 0 [ 31.546827] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.551795] Dumping ftrace buffer: [ 31.555319] (ftrace buffer empty) [ 31.559014] Modules linked in: [ 31.562307] CPU: 0 PID: 3840 Comm: syz-executor703 Not tainted 4.4.150-g5541782 #19 [ 31.570073] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.579414] task: ffff8800acb3b000 task.stack: ffff8800bba70000 [ 31.585444] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.594125] RSP: 0018:ffff8800bba77948 EFLAGS: 00010246 [ 31.599570] RAX: dffffc0000000000 RBX: ffffeafffd458000 RCX: 0000000000000000 [ 31.606824] RDX: 1ffffd5fffa8b001 RSI: ffffffff814bceaf RDI: ffffeafffd458008 [ 31.614072] RBP: ffff8800bba77958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 31.621334] R10: 0000000000000001 R11: ffff8800acb3b000 R12: 0000000000000001 [ 31.628583] R13: 1ffff1001774ef2f R14: ffff8800b4751800 R15: ffffeafffd458000 [ 31.635831] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 31.644033] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 31.649894] CR2: ffffeafffd458008 CR3: 00000000b23a6000 CR4: 00000000001606f0 [ 31.657142] Stack: [ 31.659265] ffff8800bba77bd8 0000000000000001 ffff8800bba77a00 ffffffff8150ad13 [ 31.667264] 00003fff516001e0 00003fff516001e0 0000000041b58ab3 ffffffff841ef837 [ 31.675263] ffffffff8150ab10 00000000000004f0 ffff8800ad8e7c08 ffff8800bba779c8 [ 31.683265] Call Trace: [ 31.685840] [] zap_huge_pmd+0x203/0x510 [ 31.691449] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.698006] [] unmap_single_vma+0xea3/0x1240 [ 31.704064] [] ? vm_normal_page+0x280/0x280 [ 31.710024] [] ? __put_single_page+0x60/0x60 [ 31.716062] [] unmap_vmas+0x81/0xd0 [ 31.721315] [] exit_mmap+0x1c9/0x3a0 [ 31.726655] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.733124] [] ? up_write+0x1a/0x60 [ 31.738383] [] mmput+0xf8/0x2d0 [ 31.743294] [] do_exit+0x8d8/0x26b0 [ 31.748548] [] ? file_map_prot_check+0x193/0x310 [ 31.754937] [] ? release_task.part.17+0x1200/0x1200 [ 31.761585] [] ? SyS_mprotect+0x41e/0x640 [ 31.767360] [] ? up_write+0x1a/0x60 [ 31.772614] [] ? SyS_mprotect+0x423/0x640 [ 31.778389] [] do_group_exit+0x111/0x330 [ 31.784078] [] ? do_group_exit+0x330/0x330 [ 31.789954] [] SyS_exit_group+0x1d/0x20 [ 31.795559] [] do_fast_syscall_32+0x324/0x8b0 [ 31.801683] [] sysenter_flags_fixed+0xd/0x1a [ 31.807713] 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 [ 31.834736] RIP [] page_remove_rmap+0x2e/0x260 [ 31.841089] RSP [ 31.844701] CR2: ffffeafffd458008 [ 31.848145] ---[ end trace 4750790a7e792392 ]--- [ 31.852899] Kernel panic - not syncing: Fatal exception [ 31.858631] Dumping ftrace buffer: [ 31.858635] (ftrace buffer empty) [ 31.858637] Kernel Offset: disabled [ 31.869481] Rebooting in 86400 seconds..