[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.976816] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.179070] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 28.615916] random: sshd: uninitialized urandom read (32 bytes read, 41 bits of entropy available) [ 29.249228] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) [ 29.401979] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 34.936709] random: sshd: uninitialized urandom read (32 bytes read, 76 bits of entropy available) executing program [ 35.027784] BUG: unable to handle kernel paging request at ffffeafff8d88008 [ 35.035186] IP: [] page_remove_rmap+0x2e/0x260 [ 35.041459] PGD 0 [ 35.043725] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.048717] Dumping ftrace buffer: [ 35.052231] (ftrace buffer empty) [ 35.055918] Modules linked in: [ 35.059256] CPU: 1 PID: 3833 Comm: syz-executor151 Not tainted 4.4.150-g5541782 #19 [ 35.067159] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.076559] task: ffff8800bb8f6000 task.stack: ffff8801d8c60000 [ 35.082596] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.091300] RSP: 0018:ffff8801d8c67948 EFLAGS: 00010246 [ 35.096757] RAX: dffffc0000000000 RBX: ffffeafff8d88000 RCX: 0000000000000000 [ 35.104120] RDX: 1ffffd5fff1b1001 RSI: ffffffff814bceaf RDI: ffffeafff8d88008 [ 35.111386] RBP: ffff8801d8c67958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 35.118637] R10: 0000000000000001 R11: ffff8800bb8f6000 R12: 0000000000000001 [ 35.125885] R13: 1ffff1003b18cf2f R14: ffff8801da37a800 R15: ffffeafff8d88000 [ 35.133135] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.141348] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 35.147258] CR2: ffffeafff8d88008 CR3: 00000001cfc33000 CR4: 00000000001606f0 [ 35.154518] Stack: [ 35.156643] ffff8801d8c67bd8 0000000000000001 ffff8801d8c67a00 ffffffff8150ad13 [ 35.164714] 00003ffe362001e0 00003ffe362001e0 0000000041b58ab3 ffffffff841ef837 [ 35.172946] ffffffff8150ab10 00000000000004f0 ffff8801c6d2bec8 ffff8801d8c679c8 [ 35.180938] Call Trace: [ 35.183515] [] zap_huge_pmd+0x203/0x510 [ 35.189118] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.195675] [] unmap_single_vma+0xea3/0x1240 [ 35.201711] [] ? vm_normal_page+0x280/0x280 [ 35.207665] [] ? __put_single_page+0x60/0x60 [ 35.213703] [] unmap_vmas+0x81/0xd0 [ 35.218957] [] exit_mmap+0x1c9/0x3a0 [ 35.224406] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.230999] [] ? up_write+0x1a/0x60 [ 35.236255] [] mmput+0xf8/0x2d0 [ 35.241171] [] do_exit+0x8d8/0x26b0 [ 35.246433] [] ? file_map_prot_check+0x193/0x310 [ 35.252820] [] ? release_task.part.17+0x1200/0x1200 [ 35.259476] [] ? SyS_mprotect+0x41e/0x640 [ 35.265255] [] ? up_write+0x1a/0x60 [ 35.270514] [] ? SyS_mprotect+0x423/0x640 [ 35.276411] [] do_group_exit+0x111/0x330 [ 35.282100] [] ? do_group_exit+0x330/0x330 [ 35.288018] [] SyS_exit_group+0x1d/0x20 [ 35.293628] [] do_fast_syscall_32+0x324/0x8b0 [ 35.299822] [] sysenter_flags_fixed+0xd/0x1a [ 35.305854] 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 [ 35.333217] RIP [] page_remove_rmap+0x2e/0x260 [ 35.339591] RSP [ 35.343229] CR2: ffffeafff8d88008 [ 35.346661] ---[ end trace 0399fb2a54f01a79 ]--- [ 35.351430] Kernel panic - not syncing: Fatal exception [ 35.357084] Dumping ftrace buffer: [ 35.360607] (ftrace buffer empty) [ 35.364292] Kernel Offset: disabled [ 35.367894] Rebooting in 86400 seconds..