[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 21.039784] random: sshd: uninitialized urandom read (32 bytes read, 34 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 23.090076] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 23.552921] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 24.225256] random: sshd: uninitialized urandom read (32 bytes read, 71 bits of entropy available) [ 24.398555] random: sshd: uninitialized urandom read (32 bytes read, 73 bits of entropy available) Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. [ 30.106073] random: sshd: uninitialized urandom read (32 bytes read, 78 bits of entropy available) executing program [ 30.195461] BUG: unable to handle kernel paging request at ffffeafff8bf8008 [ 30.202863] IP: [] page_remove_rmap+0x2e/0x260 [ 30.209112] PGD 0 [ 30.211359] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.216313] Dumping ftrace buffer: [ 30.219869] (ftrace buffer empty) [ 30.223557] Modules linked in: [ 30.226846] CPU: 0 PID: 3808 Comm: syz-executor042 Not tainted 4.4.150-g5541782 #83 [ 30.234612] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.243954] task: ffff8801c945e000 task.stack: ffff8801d4548000 [ 30.249984] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.258690] RSP: 0018:ffff8801d454f9c0 EFLAGS: 00010246 [ 30.264121] RAX: dffffc0000000000 RBX: ffffeafff8bf8000 RCX: 0000000000000000 [ 30.271368] RDX: 1ffffd5fff17f001 RSI: ffffffff814bceaf RDI: ffffeafff8bf8008 [ 30.278628] RBP: ffff8801d454f9d0 R08: ffffffff85363fb0 R09: 0000000000000000 [ 30.285897] R10: 0000000000000001 R11: ffff8801c945e000 R12: 0000000000000001 [ 30.293146] R13: 1ffff1003a8a9f3e R14: ffff8801d05ce800 R15: ffffeafff8bf8000 [ 30.300391] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 30.308604] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.314469] CR2: ffffeafff8bf8008 CR3: 00000001cf616000 CR4: 00000000001606f0 [ 30.321726] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 30.328976] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 30.336231] Stack: [ 30.338354] ffff8801d454fc50 0000000000000001 ffff8801d454fa78 ffffffff8150ad13 [ 30.346384] 00003ffe2fe001e0 00003ffe2fe001e0 0000000041b58ab3 ffffffff841ef837 [ 30.354378] ffffffff8150ab10 00000000000004f0 ffff8801d071d4d0 ffff8801d454fa40 [ 30.362416] Call Trace: [ 30.364982] [] zap_huge_pmd+0x203/0x510 [ 30.370583] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 30.377466] [] unmap_single_vma+0xea3/0x1240 [ 30.383498] [] ? vm_normal_page+0x280/0x280 [ 30.389457] [] ? __put_single_page+0x60/0x60 [ 30.395502] [] unmap_vmas+0x81/0xd0 [ 30.400756] [] exit_mmap+0x1c9/0x3a0 [ 30.406094] [] ? SyS_remap_file_pages+0x870/0x870 [ 30.412579] [] ? up_write+0x1a/0x60 [ 30.417834] [] mmput+0xf8/0x2d0 [ 30.422748] [] do_exit+0x8d8/0x26b0 [ 30.428019] [] ? file_map_prot_check+0x193/0x310 [ 30.434401] [] ? release_task.part.17+0x1200/0x1200 [ 30.441052] [] ? SyS_mprotect+0x41e/0x640 [ 30.446823] [] ? up_write+0x1a/0x60 [ 30.452075] [] ? SyS_mprotect+0x423/0x640 [ 30.457847] [] do_group_exit+0x111/0x330 [ 30.463546] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 30.470012] [] SyS_exit_group+0x1d/0x20 [ 30.475640] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 30.482201] 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 [ 30.509338] RIP [] page_remove_rmap+0x2e/0x260 [ 30.515676] RSP [ 30.519275] CR2: ffffeafff8bf8008 [ 30.522719] ---[ end trace edd5e3281efdeade ]--- [ 30.527446] Kernel panic - not syncing: Fatal exception [ 30.533233] Dumping ftrace buffer: [ 30.536768] (ftrace buffer empty) [ 30.540453] Kernel Offset: disabled [ 30.544056] Rebooting in 86400 seconds..