[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.085874] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.373767] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [ 21.710297] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 22.240563] random: sshd: uninitialized urandom read (32 bytes read, 47 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.415586] random: sshd: uninitialized urandom read (32 bytes read, 50 bits of entropy available) Warning: Permanently added '10.128.0.60' (ECDSA) to the list of known hosts. [ 27.943354] random: sshd: uninitialized urandom read (32 bytes read, 56 bits of entropy available) executing program [ 28.031029] BUG: unable to handle kernel paging request at ffffeafff8c28008 [ 28.038382] IP: [] page_remove_rmap+0x2e/0x260 [ 28.044628] PGD 0 [ 28.046872] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.051822] Dumping ftrace buffer: [ 28.055334] (ftrace buffer empty) [ 28.059033] Modules linked in: [ 28.062370] CPU: 0 PID: 3840 Comm: syz-executor148 Not tainted 4.4.150-g5541782 #19 [ 28.070134] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.079462] task: ffff8801d2d08000 task.stack: ffff8801d9228000 [ 28.085488] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 28.094189] RSP: 0018:ffff8801d922f948 EFLAGS: 00010246 [ 28.099702] RAX: dffffc0000000000 RBX: ffffeafff8c28000 RCX: 0000000000000000 [ 28.106952] RDX: 1ffffd5fff185001 RSI: ffffffff814bceaf RDI: ffffeafff8c28008 [ 28.114233] RBP: ffff8801d922f958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 28.121479] R10: 0000000000000001 R11: ffff8801d2d08000 R12: 0000000000000001 [ 28.128766] R13: 1ffff1003b245f2f R14: ffff8801c7aba800 R15: ffffeafff8c28000 [ 28.136012] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 28.144223] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 28.150078] CR2: ffffeafff8c28008 CR3: 00000001cc40f000 CR4: 00000000001606f0 [ 28.157324] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.164583] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.171838] Stack: [ 28.173959] ffff8801d922fbd8 0000000000000001 ffff8801d922fa00 ffffffff8150ad13 [ 28.181944] 00003ffe30a001e0 00003ffe30a001e0 0000000041b58ab3 ffffffff841ef837 [ 28.189935] ffffffff8150ab10 00000000000004f0 ffff8800af120e18 ffff8801d922f9c8 [ 28.198136] Call Trace: [ 28.200702] [] zap_huge_pmd+0x203/0x510 [ 28.206305] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 28.212859] [] unmap_single_vma+0xea3/0x1240 [ 28.218888] [] ? vm_normal_page+0x280/0x280 [ 28.224837] [] ? __put_single_page+0x60/0x60 [ 28.230878] [] unmap_vmas+0x81/0xd0 [ 28.236127] [] exit_mmap+0x1c9/0x3a0 [ 28.241464] [] ? SyS_remap_file_pages+0x870/0x870 [ 28.247930] [] ? up_write+0x1a/0x60 [ 28.253184] [] mmput+0xf8/0x2d0 [ 28.258089] [] do_exit+0x8d8/0x26b0 [ 28.263358] [] ? file_map_prot_check+0x193/0x310 [ 28.269741] [] ? release_task.part.17+0x1200/0x1200 [ 28.276384] [] ? SyS_mprotect+0x41e/0x640 [ 28.282157] [] ? up_write+0x1a/0x60 [ 28.287422] [] ? SyS_mprotect+0x423/0x640 [ 28.293198] [] do_group_exit+0x111/0x330 [ 28.298890] [] ? do_group_exit+0x330/0x330 [ 28.304763] [] SyS_exit_group+0x1d/0x20 [ 28.310362] [] do_fast_syscall_32+0x324/0x8b0 [ 28.316480] [] sysenter_flags_fixed+0xd/0x1a [ 28.322510] 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 [ 28.349266] RIP [] page_remove_rmap+0x2e/0x260 [ 28.355597] RSP [ 28.359197] CR2: ffffeafff8c28008 [ 28.362635] ---[ end trace b9b15a7b62fb003a ]--- [ 28.367360] Kernel panic - not syncing: Fatal exception [ 28.373078] Dumping ftrace buffer: [ 28.376611] (ftrace buffer empty) [ 28.380295] Kernel Offset: disabled [ 28.383894] Rebooting in 86400 seconds..