[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.335539] random: sshd: uninitialized urandom read (32 bytes read, 31 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.478113] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.899976] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 23.667353] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) [ 23.834011] random: sshd: uninitialized urandom read (32 bytes read, 75 bits of entropy available) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 29.459540] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) executing program [ 29.549806] BUG: unable to handle kernel paging request at ffffeafffd360008 [ 29.557191] IP: [] page_remove_rmap+0x2e/0x260 [ 29.563443] PGD 0 [ 29.565687] Oops: 0000 [#1] PREEMPT SMP KASAN [ 29.570628] Dumping ftrace buffer: [ 29.574154] (ftrace buffer empty) [ 29.577839] Modules linked in: [ 29.581123] CPU: 0 PID: 3708 Comm: syz-executor584 Not tainted 4.4.150-g5541782 #19 [ 29.588887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 29.598215] task: ffff8801ce57e000 task.stack: ffff8800b15e0000 [ 29.604243] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 29.612916] RSP: 0018:ffff8800b15e7948 EFLAGS: 00010246 [ 29.618337] RAX: dffffc0000000000 RBX: ffffeafffd360000 RCX: 0000000000000000 [ 29.625582] RDX: 1ffffd5fffa6c001 RSI: ffffffff814bceaf RDI: ffffeafffd360008 [ 29.632825] RBP: ffff8800b15e7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 29.640068] R10: 0000000000000001 R11: ffff8801ce57e000 R12: 0000000000000001 [ 29.647310] R13: 1ffff100162bcf2f R14: ffff8800b5b65800 R15: ffffeafffd360000 [ 29.654556] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 29.662751] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 29.668606] CR2: ffffeafffd360008 CR3: 00000000b5b67000 CR4: 00000000001606f0 [ 29.675852] Stack: [ 29.677971] ffff8800b15e7bd8 0000000000000001 ffff8800b15e7a00 ffffffff8150ad13 [ 29.685947] 00003fff4d8001e0 00003fff4d8001e0 0000000041b58ab3 ffffffff841ef837 [ 29.693933] ffffffff8150ab10 00000000000004f0 ffff8800b23c8210 ffff8800b15e79c8 [ 29.701915] Call Trace: [ 29.704486] [] zap_huge_pmd+0x203/0x510 [ 29.710092] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 29.716716] [] unmap_single_vma+0xea3/0x1240 [ 29.722756] [] ? vm_normal_page+0x280/0x280 [ 29.728701] [] ? __put_single_page+0x60/0x60 [ 29.734735] [] unmap_vmas+0x81/0xd0 [ 29.739985] [] exit_mmap+0x1c9/0x3a0 [ 29.745322] [] ? SyS_remap_file_pages+0x870/0x870 [ 29.751788] [] ? up_write+0x1a/0x60 [ 29.757038] [] mmput+0xf8/0x2d0 [ 29.761943] [] do_exit+0x8d8/0x26b0 [ 29.767196] [] ? file_map_prot_check+0x193/0x310 [ 29.773573] [] ? release_task.part.17+0x1200/0x1200 [ 29.780213] [] ? SyS_mprotect+0x41e/0x640 [ 29.785984] [] ? up_write+0x1a/0x60 [ 29.791244] [] ? SyS_mprotect+0x423/0x640 [ 29.797015] [] do_group_exit+0x111/0x330 [ 29.802698] [] ? do_group_exit+0x330/0x330 [ 29.808555] [] SyS_exit_group+0x1d/0x20 [ 29.814153] [] do_fast_syscall_32+0x324/0x8b0 [ 29.820273] [] sysenter_flags_fixed+0xd/0x1a [ 29.826299] 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 [ 29.853008] RIP [] page_remove_rmap+0x2e/0x260 [ 29.859337] RSP [ 29.862933] CR2: ffffeafffd360008 [ 29.866361] ---[ end trace 3a651dd004841420 ]--- [ 29.871086] Kernel panic - not syncing: Fatal exception [ 29.876759] Dumping ftrace buffer: [ 29.880296] (ftrace buffer empty) [ 29.883979] Kernel Offset: disabled [ 29.887583] Rebooting in 86400 seconds..