[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 22.169906] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 28.207959] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 28.646455] random: sshd: uninitialized urandom read (32 bytes read, 39 bits of entropy available) [ 29.235382] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) [ 29.405439] random: sshd: uninitialized urandom read (32 bytes read, 63 bits of entropy available) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 34.981388] random: sshd: uninitialized urandom read (32 bytes read, 69 bits of entropy available) executing program [ 35.069750] BUG: unable to handle kernel paging request at ffffeafff8b80008 [ 35.077158] IP: [] page_remove_rmap+0x2e/0x260 [ 35.083433] PGD 0 [ 35.085684] Oops: 0000 [#1] PREEMPT SMP KASAN [ 35.090649] Dumping ftrace buffer: [ 35.094174] (ftrace buffer empty) [ 35.097856] Modules linked in: [ 35.101146] CPU: 1 PID: 3828 Comm: syz-executor105 Not tainted 4.4.148-gf057ff9 #81 [ 35.108912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.118238] task: ffff8800bbac6000 task.stack: ffff8801d92b8000 [ 35.124265] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 35.133013] RSP: 0018:ffff8801d92bf9c0 EFLAGS: 00010246 [ 35.138444] RAX: dffffc0000000000 RBX: ffffeafff8b80000 RCX: 0000000000000000 [ 35.145701] RDX: 1ffffd5fff170001 RSI: ffffffff814bc75f RDI: ffffeafff8b80008 [ 35.152942] RBP: ffff8801d92bf9d0 R08: ffffffff85333170 R09: 0000000000000000 [ 35.160190] R10: 0000000000000001 R11: ffff8800bbac6000 R12: 0000000000000001 [ 35.167441] R13: 1ffff1003b257f3e R14: ffff8801ccf42800 R15: ffffeafff8b80000 [ 35.174684] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 35.182883] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 35.188879] CR2: ffffeafff8b80008 CR3: 00000001cde0d000 CR4: 00000000001606f0 [ 35.196235] Stack: [ 35.198365] ffff8801d92bfc50 0000000000000001 ffff8801d92bfa78 ffffffff8150a1f3 [ 35.206462] 00003ffe2e0001e0 00003ffe2e0001e0 0000000041b58ab3 ffffffff841ef82f [ 35.214741] ffffffff81509ff0 00000000000004f0 ffff8801cdf68d68 ffff8801d92bfa40 [ 35.222746] Call Trace: [ 35.225320] [] zap_huge_pmd+0x203/0x510 [ 35.231008] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 35.237582] [] unmap_single_vma+0xea3/0x1240 [ 35.243627] [] ? vm_normal_page+0x230/0x230 [ 35.249582] [] ? __put_single_page+0x60/0x60 [ 35.255637] [] unmap_vmas+0x81/0xd0 [ 35.260898] [] exit_mmap+0x1c9/0x3a0 [ 35.266245] [] ? SyS_remap_file_pages+0x870/0x870 [ 35.272720] [] ? up_write+0x1a/0x60 [ 35.277987] [] mmput+0xf8/0x2d0 [ 35.282977] [] do_exit+0x8d8/0x26b0 [ 35.288338] [] ? file_map_prot_check+0x193/0x310 [ 35.294770] [] ? release_task.part.17+0x1200/0x1200 [ 35.301430] [] ? SyS_mprotect+0x41e/0x640 [ 35.307216] [] ? up_write+0x1a/0x60 [ 35.312564] [] ? SyS_mprotect+0x423/0x640 [ 35.318360] [] do_group_exit+0x111/0x330 [ 35.324063] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 35.330556] [] SyS_exit_group+0x1d/0x20 [ 35.336179] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 35.342746] Code: e5 41 54 53 48 89 fb e8 e1 77 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 b3 77 e9 ff f0 83 43 18 ff 78 [ 35.370087] RIP [] page_remove_rmap+0x2e/0x260 [ 35.376434] RSP [ 35.380037] CR2: ffffeafff8b80008 [ 35.383472] ---[ end trace 0b79faf722810517 ]--- [ 35.388211] Kernel panic - not syncing: Fatal exception [ 35.393909] Dumping ftrace buffer: [ 35.397438] (ftrace buffer empty) [ 35.401126] Kernel Offset: disabled [ 35.404733] Rebooting in 86400 seconds..