[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.929151] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 25.851486] random: sshd: uninitialized urandom read (32 bytes read) [ 26.237947] random: sshd: uninitialized urandom read (32 bytes read) [ 26.749028] random: sshd: uninitialized urandom read (32 bytes read) [ 26.885436] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.18' (ECDSA) to the list of known hosts. [ 32.495583] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 32.575988] BUG: unable to handle kernel paging request at ffffeafff91c8020 [ 32.583407] IP: [] page_remove_rmap+0x37/0x6d0 [ 32.589669] PGD 0 [ 32.591616] [ 32.593241] Oops: 0000 [#1] PREEMPT SMP KASAN [ 32.597712] Dumping ftrace buffer: [ 32.601225] (ftrace buffer empty) [ 32.604974] Modules linked in: [ 32.608277] CPU: 1 PID: 3804 Comm: syz-executor896 Not tainted 4.9.122-g54068d6 #26 [ 32.616080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.625516] task: ffff8801b7723000 task.stack: ffff8801b6008000 [ 32.631676] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 32.640368] RSP: 0018:ffff8801b600f948 EFLAGS: 00010246 [ 32.645788] RAX: dffffc0000000000 RBX: ffffeafff91c8000 RCX: 0000000000000000 [ 32.653033] RDX: 1ffffd5fff239004 RSI: ffffffff814f5918 RDI: ffffeafff91c8000 [ 32.660624] RBP: ffff8801b600f970 R08: 0000000000033ac0 R09: 0000000000000001 [ 32.667931] R10: ffff8801b7723000 R11: 0000000000000001 R12: ffff8801b600fc08 [ 32.675236] R13: ffffeafff91c8020 R14: ffffeafff91c8000 R15: 0000000000000001 [ 32.682547] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 32.690867] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.696727] CR2: ffffeafff91c8020 CR3: 00000001c8da7000 CR4: 00000000001606f0 [ 32.704098] Stack: [ 32.706235] ffffeafff91c8020 ffff8801b600fc08 ffff8801c8cd0800 ffffeafff91c8000 [ 32.714307] ffff8801bef25528 ffff8801b600f9c8 ffffffff8154cb8f ffff8801b600fc18 [ 32.722307] ffff8801b600fc10 ffff8801b600fc88 00003ffe472001e0 00000001c8cd0000 [ 32.730330] Call Trace: [ 32.732907] [] zap_huge_pmd+0x16f/0x860 [ 32.738516] [] unmap_page_range+0x12ad/0x1730 [ 32.744640] [] ? vm_normal_page_pmd+0x310/0x310 [ 32.751039] [] unmap_single_vma+0x101/0x260 [ 32.756984] [] unmap_vmas+0x102/0x1d0 [ 32.762407] [] exit_mmap+0x214/0x3f0 [ 32.767747] [] ? SyS_munmap+0xa0/0xa0 [ 32.773176] [] ? up_write+0x1a/0x60 [ 32.778434] [] mmput+0xf3/0x2d0 [ 32.783481] [] do_exit+0x906/0x27b0 [ 32.788735] [] ? release_task.part.19+0x1210/0x1210 [ 32.795418] [] ? up_write+0x1a/0x60 [ 32.800842] [] ? do_mprotect_pkey+0x71d/0x890 [ 32.807088] [] ? mprotect_fixup+0x930/0x930 [ 32.813048] [] do_group_exit+0x111/0x340 [ 32.818745] [] ? do_group_exit+0x340/0x340 [ 32.824778] [] SyS_exit_group+0x1d/0x20 [ 32.830422] [] do_syscall_64+0x1a6/0x490 [ 32.836124] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 32.843023] Code: 55 41 54 53 48 89 fb e8 58 b4 e6 ff 4c 8d 6b 20 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 80 3c 02 00 0f 85 b8 05 00 00 <4c> 8b 73 20 49 89 dc 41 f6 c6 01 0f 85 4b 03 00 00 e8 23 b4 e6 [ 32.870169] RIP [] page_remove_rmap+0x37/0x6d0 [ 32.876500] RSP [ 32.880097] CR2: ffffeafff91c8020 [ 32.883532] ---[ end trace 1ea82eab3621ce0b ]--- [ 32.888261] Kernel panic - not syncing: Fatal exception [ 32.893957] Dumping ftrace buffer: [ 32.897480] (ftrace buffer empty) [ 32.901166] Kernel Offset: disabled [ 32.904767] Rebooting in 86400 seconds..