[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.827807] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. [ 21.025287] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [ 21.237896] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [ 21.889622] random: sshd: uninitialized urandom read (32 bytes read, 60 bits of entropy available) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.072337] random: sshd: uninitialized urandom read (32 bytes read, 64 bits of entropy available) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 27.660705] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) executing program [ 27.752640] BUG: unable to handle kernel paging request at ffffeafff8ba0008 [ 27.759999] IP: [] page_remove_rmap+0x2e/0x260 [ 27.766245] PGD 0 [ 27.768486] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.773429] Dumping ftrace buffer: [ 27.776948] (ftrace buffer empty) [ 27.780631] Modules linked in: [ 27.783936] CPU: 1 PID: 3803 Comm: syz-executor191 Not tainted 4.4.150-g5541782 #83 [ 27.791706] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.801041] task: ffff8801c8ad9800 task.stack: ffff8801c8408000 [ 27.807078] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 27.815769] RSP: 0018:ffff8801c840f9c0 EFLAGS: 00010246 [ 27.821187] RAX: dffffc0000000000 RBX: ffffeafff8ba0000 RCX: ffffea0002db0000 [ 27.828431] RDX: 1ffffd5fff174001 RSI: ffffffff814bceaf RDI: ffffeafff8ba0008 [ 27.835676] RBP: ffff8801c840f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 27.842951] R10: 0000000000000001 R11: ffff8801c8ad9800 R12: 0000000000000001 [ 27.850194] R13: 1ffff10039081f3e R14: ffff8801cd352800 R15: ffffeafff8ba0000 [ 27.857460] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.865662] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.871518] CR2: ffffeafff8ba0008 CR3: 00000001d0cf9000 CR4: 00000000001606f0 [ 27.878766] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.886010] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.893257] Stack: [ 27.895380] ffff8801c840fc50 0000000000000001 ffff8801c840fa78 ffffffff8150ad13 [ 27.903366] 00003ffe2e8001e0 00003ffe2e8001e0 0000000041b58ab3 ffffffff841ef837 [ 27.911357] ffffffff8150ab10 00000000000004f0 ffff8801d02a4c60 ffff8801c840fa40 [ 27.919381] Call Trace: [ 27.921956] [] zap_huge_pmd+0x203/0x510 [ 27.927556] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 27.934127] [] unmap_single_vma+0xea3/0x1240 [ 27.940160] [] ? vm_normal_page+0x280/0x280 [ 27.946109] [] ? __put_single_page+0x60/0x60 [ 27.952140] [] unmap_vmas+0x81/0xd0 [ 27.957397] [] exit_mmap+0x1c9/0x3a0 [ 27.962735] [] ? SyS_remap_file_pages+0x870/0x870 [ 27.969200] [] ? up_write+0x1a/0x60 [ 27.974452] [] mmput+0xf8/0x2d0 [ 27.979373] [] do_exit+0x8d8/0x26b0 [ 27.984633] [] ? file_map_prot_check+0x193/0x310 [ 27.991011] [] ? release_task.part.17+0x1200/0x1200 [ 27.997654] [] ? SyS_mprotect+0x41e/0x640 [ 28.003426] [] ? up_write+0x1a/0x60 [ 28.008677] [] ? SyS_mprotect+0x423/0x640 [ 28.014452] [] do_group_exit+0x111/0x330 [ 28.020138] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.026617] [] SyS_exit_group+0x1d/0x20 [ 28.032218] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 28.038791] 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 [ 28.065594] RIP [] page_remove_rmap+0x2e/0x260 [ 28.071929] RSP [ 28.075530] CR2: ffffeafff8ba0008 [ 28.078958] ---[ end trace 8f492b578510c822 ]--- [ 28.083704] Kernel panic - not syncing: Fatal exception [ 28.089397] Dumping ftrace buffer: [ 28.092935] (ftrace buffer empty) [ 28.096641] Kernel Offset: disabled [ 28.100244] Rebooting in 86400 seconds..