[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 20.859001] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.031735] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.402642] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 26.013589] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 26.170992] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.10.63' (ECDSA) to the list of known hosts. [ 31.831019] random: sshd: uninitialized urandom read (32 bytes read, 67 bits of entropy available) executing program [ 31.920815] BUG: unable to handle kernel paging request at ffffeafffd2e8008 [ 31.928167] IP: [] page_remove_rmap+0x2e/0x260 [ 31.934405] PGD 0 [ 31.936761] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.941688] Dumping ftrace buffer: [ 31.945197] (ftrace buffer empty) [ 31.948880] Modules linked in: [ 31.952161] CPU: 1 PID: 3805 Comm: syz-executor104 Not tainted 4.4.150-g5541782 #19 [ 31.959922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.969250] task: ffff8801cacbb000 task.stack: ffff8800af7c0000 [ 31.975278] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 31.983940] RSP: 0018:ffff8800af7c7948 EFLAGS: 00010246 [ 31.989366] RAX: dffffc0000000000 RBX: ffffeafffd2e8000 RCX: 0000000000000000 [ 31.996608] RDX: 1ffffd5fffa5d001 RSI: ffffffff814bceaf RDI: ffffeafffd2e8008 [ 32.003849] RBP: ffff8800af7c7958 R08: ffffffff85363fb0 R09: 0000000000000000 [ 32.011152] R10: 0000000000000001 R11: ffff8801cacbb000 R12: 0000000000000001 [ 32.018466] R13: 1ffff10015ef8f2f R14: ffff8800ae897800 R15: ffffeafffd2e8000 [ 32.025716] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.033915] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 32.039770] CR2: ffffeafffd2e8008 CR3: 00000000ae933000 CR4: 00000000001606f0 [ 32.047011] Stack: [ 32.049133] ffff8800af7c7bd8 0000000000000001 ffff8800af7c7a00 ffffffff8150ad13 [ 32.057113] 00003fff4ba001e0 00003fff4ba001e0 0000000041b58ab3 ffffffff841ef837 [ 32.065082] ffffffff8150ab10 00000000000004f0 ffff8800b11cff20 ffff8800af7c79c8 [ 32.073051] Call Trace: [ 32.075621] [] zap_huge_pmd+0x203/0x510 [ 32.081233] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 32.087790] [] unmap_single_vma+0xea3/0x1240 [ 32.093820] [] ? vm_normal_page+0x280/0x280 [ 32.099762] [] ? __put_single_page+0x60/0x60 [ 32.105792] [] unmap_vmas+0x81/0xd0 [ 32.111045] [] exit_mmap+0x1c9/0x3a0 [ 32.116383] [] ? SyS_remap_file_pages+0x870/0x870 [ 32.122862] [] ? up_write+0x1a/0x60 [ 32.128115] [] mmput+0xf8/0x2d0 [ 32.133030] [] do_exit+0x8d8/0x26b0 [ 32.138280] [] ? file_map_prot_check+0x193/0x310 [ 32.144655] [] ? release_task.part.17+0x1200/0x1200 [ 32.151292] [] ? SyS_mprotect+0x41e/0x640 [ 32.157061] [] ? up_write+0x1a/0x60 [ 32.162312] [] ? SyS_mprotect+0x423/0x640 [ 32.168127] [] do_group_exit+0x111/0x330 [ 32.173825] [] ? do_group_exit+0x330/0x330 [ 32.179683] [] SyS_exit_group+0x1d/0x20 [ 32.185285] [] do_fast_syscall_32+0x324/0x8b0 [ 32.191406] [] sysenter_flags_fixed+0xd/0x1a [ 32.197431] 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 [ 32.224347] RIP [] page_remove_rmap+0x2e/0x260 [ 32.230685] RSP [ 32.234293] CR2: ffffeafffd2e8008 [ 32.237718] ---[ end trace 571c1e81af5a3b92 ]--- [ 32.242443] Kernel panic - not syncing: Fatal exception [ 32.248078] Dumping ftrace buffer: [ 32.251601] (ftrace buffer empty) [ 32.255284] Kernel Offset: disabled [ 32.258881] Rebooting in 86400 seconds..