[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 19.237221] random: sshd: uninitialized urandom read (32 bytes read, 33 bits of entropy available) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.176400] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 24.514783] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 25.076724] random: sshd: uninitialized urandom read (32 bytes read, 59 bits of entropy available) [ 25.230829] random: sshd: uninitialized urandom read (32 bytes read, 61 bits of entropy available) Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. [ 30.749862] random: sshd: uninitialized urandom read (32 bytes read, 68 bits of entropy available) executing program [ 30.842947] BUG: unable to handle kernel paging request at ffffeafff8c88008 [ 30.850515] IP: [] page_remove_rmap+0x2e/0x260 [ 30.856984] PGD 0 [ 30.859234] Oops: 0000 [#1] PREEMPT SMP KASAN [ 30.864439] Dumping ftrace buffer: [ 30.868213] (ftrace buffer empty) [ 30.871905] Modules linked in: [ 30.875197] CPU: 1 PID: 3782 Comm: syz-executor747 Not tainted 4.4.150-g5541782 #83 [ 30.883114] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 30.892632] task: ffff8800afd5c800 task.stack: ffff8801d7bb0000 [ 30.898665] RIP: 0010:[] [] page_remove_rmap+0x2e/0x260 [ 30.907534] RSP: 0018:ffff8801d7bb79c0 EFLAGS: 00010246 [ 30.912953] RAX: dffffc0000000000 RBX: ffffeafff8c88000 RCX: 0000000000000000 [ 30.920203] RDX: 1ffffd5fff191001 RSI: ffffffff814bceaf RDI: ffffeafff8c88008 [ 30.927555] RBP: ffff8801d7bb79d0 R08: ffffffff85333170 R09: 0000000000000000 [ 30.934799] R10: 0000000000000001 R11: ffff8800afd5c800 R12: 0000000000000001 [ 30.942166] R13: 1ffff1003af76f3e R14: ffff8801cf604800 R15: ffffeafff8c88000 [ 30.949528] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 30.957730] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 30.963588] CR2: ffffeafff8c88008 CR3: 00000001d02a2000 CR4: 00000000001606f0 [ 30.970837] Stack: [ 30.973046] ffff8801d7bb7c50 0000000000000001 ffff8801d7bb7a78 ffffffff8150ad13 [ 30.981125] 00003ffe322001e0 00003ffe322001e0 0000000041b58ab3 ffffffff841ef837 [ 30.989147] ffffffff8150ab10 00000000000004f0 ffff8801d0046688 ffff8801d7bb7a40 [ 30.997137] Call Trace: [ 30.999710] [] zap_huge_pmd+0x203/0x510 [ 31.005486] [] ? __pmd_trans_huge_lock+0x320/0x320 [ 31.012050] [] unmap_single_vma+0xea3/0x1240 [ 31.018084] [] ? vm_normal_page+0x280/0x280 [ 31.024135] [] ? __put_single_page+0x60/0x60 [ 31.030174] [] unmap_vmas+0x81/0xd0 [ 31.035425] [] exit_mmap+0x1c9/0x3a0 [ 31.040880] [] ? SyS_remap_file_pages+0x870/0x870 [ 31.047363] [] ? up_write+0x1a/0x60 [ 31.052718] [] mmput+0xf8/0x2d0 [ 31.057625] [] do_exit+0x8d8/0x26b0 [ 31.062879] [] ? file_map_prot_check+0x193/0x310 [ 31.069262] [] ? release_task.part.17+0x1200/0x1200 [ 31.075904] [] ? SyS_mprotect+0x41e/0x640 [ 31.081772] [] ? up_write+0x1a/0x60 [ 31.087024] [] ? SyS_mprotect+0x423/0x640 [ 31.092793] [] do_group_exit+0x111/0x330 [ 31.098481] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 31.104945] [] SyS_exit_group+0x1d/0x20 [ 31.110596] [] entry_SYSCALL_64_fastpath+0x22/0x9e [ 31.117148] 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 [ 31.144444] RIP [] page_remove_rmap+0x2e/0x260 [ 31.150986] RSP [ 31.154583] CR2: ffffeafff8c88008 [ 31.158006] ---[ end trace aed75e7dcfc83b9f ]--- [ 31.162783] Kernel panic - not syncing: Fatal exception [ 31.168513] Dumping ftrace buffer: [ 31.172034] (ftrace buffer empty) [ 31.175720] Kernel Offset: disabled [ 31.179320] Rebooting in 86400 seconds..