[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.355882] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 20.520835] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 20.785493] random: sshd: uninitialized urandom read (32 bytes read, 35 bits of entropy available) [ 21.437379] random: sshd: uninitialized urandom read (32 bytes read, 65 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.603946] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. [ 27.276870] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) executing program [ 27.360965] BUG: unable to handle kernel paging request at ffffeafff8bb0008 [ 27.368359] IP: [] page_remove_rmap+0x2e/0x260 [ 27.374608] PGD 0 [ 27.376855] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.381832] Dumping ftrace buffer: [ 27.385361] (ftrace buffer empty) [ 27.389070] Modules linked in: [ 27.392410] CPU: 0 PID: 3779 Comm: syz-executor073 Not tainted 4.4.150-g5541782 #19 [ 27.400181] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.409511] task: ffff8800af4d8000 task.stack: ffff8801ca1f0000 [ 27.415571] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.424275] RSP: 0018:ffff8801ca1f7948 EFLAGS: 00010246 [ 27.429698] RAX: dffffc0000000000 RBX: ffffeafff8bb0000 RCX: 0000000000000000 [ 27.436946] RDX: 1ffffd5fff176001 RSI: ffffffff814bceaf RDI: ffffeafff8bb0008 [ 27.444193] RBP: ffff8801ca1f7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.451439] R10: 0000000000000001 R11: ffff8800af4d8000 R12: 0000000000000001 [ 27.458689] R13: 1ffff1003943ef2f R14: ffff8801ca9ea800 R15: ffffeafff8bb0000 [ 27.465943] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.474168] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.480024] CR2: ffffeafff8bb0008 CR3: 00000001d0c4a000 CR4: 00000000001606f0 [ 27.487287] Stack: [ 27.489412] ffff8801ca1f7bd8 0000000000000001 ffff8801ca1f7a00 ffffffff8150ad13 [ 27.497446] 00003ffe2ec001e0 00003ffe2ec001e0 0000000041b58ab3 ffffffff841ef837 [ 27.505442] ffffffff8150ab10 00000000000004f0 ffff8800b0e5b9a0 ffff8801ca1f79c8 [ 27.513451] Call Trace: [ 27.516018] [] zap_huge_pmd+0x203/0x510 [ 27.521619] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.528177] [] unmap_single_vma+0xea3/0x1240 [ 27.534210] [] ? vm_normal_page+0x280/0x280 [ 27.540161] [] ? __put_single_page+0x60/0x60 [ 27.546193] [] unmap_vmas+0x81/0xd0 [ 27.551464] [] exit_mmap+0x1c9/0x3a0 [ 27.556805] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.563273] [] ? up_write+0x1a/0x60 [ 27.568535] [] mmput+0xf8/0x2d0 [ 27.573442] [] do_exit+0x8d8/0x26b0 [ 27.578699] [] ? file_map_prot_check+0x193/0x310 [ 27.585080] [] ? release_task.part.17+0x1200/0x1200 [ 27.591724] [] ? SyS_mprotect+0x41e/0x640 [ 27.597515] [] ? up_write+0x1a/0x60 [ 27.602771] [] ? SyS_mprotect+0x423/0x640 [ 27.608549] [] do_group_exit+0x111/0x330 [ 27.614235] [] ? do_group_exit+0x330/0x330 [ 27.620094] [] SyS_exit_group+0x1d/0x20 [ 27.625695] [] do_fast_syscall_32+0x324/0x8b0 [ 27.631829] [] sysenter_flags_fixed+0xd/0x1a [ 27.637861] 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 [ 27.664826] RIP [] page_remove_rmap+0x2e/0x260 [ 27.671177] RSP [ 27.674792] CR2: ffffeafff8bb0008 [ 27.678221] ---[ end trace d0db35fb7126a5ee ]--- [ 27.682952] Kernel panic - not syncing: Fatal exception [ 27.688605] Dumping ftrace buffer: [ 27.692127] (ftrace buffer empty) [ 27.695814] Kernel Offset: disabled [ 27.699413] Rebooting in 86400 seconds..