[....] Starting OpenBSD Secure Shell server: sshd[ 14.060460] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ 14.350591] random: sshd: uninitialized urandom read (32 bytes read) [1G[[32m ok [39;49m8[?25h[?0c. [ 14.761059] random: sshd: uninitialized urandom read (32 bytes read) [ 15.289672] random: sshd: uninitialized urandom read (32 bytes read) [ 15.424638] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.42' (ECDSA) to the list of known hosts. syzkaller login: [ 20.913134] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 21.000247] BUG: unable to handle kernel paging request at ffffeafff8e80020 [ 21.007833] IP: [] page_remove_rmap+0x37/0x6d0 [ 21.014103] PGD 0 [ 21.016048] [ 21.017676] Oops: 0000 [#1] PREEMPT SMP KASAN [ 21.022152] Dumping ftrace buffer: [ 21.025662] (ftrace buffer empty) [ 21.029385] Modules linked in: [ 21.032714] CPU: 1 PID: 3790 Comm: syz-executor322 Not tainted 4.9.122-g54068d6 #78 [ 21.040515] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 21.049846] task: ffff8801b6b60000 task.stack: ffff8801b6b20000 [ 21.055882] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 21.064595] RSP: 0018:ffff8801b6b27948 EFLAGS: 00010246 [ 21.070029] RAX: dffffc0000000000 RBX: ffffeafff8e80000 RCX: 0000000000000000 [ 21.077301] RDX: 1ffffd5fff1d0004 RSI: ffffffff814f5918 RDI: ffffeafff8e80000 [ 21.084557] RBP: ffff8801b6b27970 R08: 0000000000034100 R09: 0000000000000001 [ 21.091816] R10: ffff8801b6b60000 R11: 0000000000000001 R12: ffff8801b6b27c08 [ 21.099065] R13: ffffeafff8e80020 R14: ffffeafff8e80000 R15: 0000000000000001 [ 21.106317] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 21.114614] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 21.120474] CR2: ffffeafff8e80020 CR3: 00000001c65db000 CR4: 00000000001606f0 [ 21.127737] Stack: [ 21.129863] ffffeafff8e80020 ffff8801b6b27c08 ffff8801c9678800 ffffeafff8e80000 [ 21.137900] ffff8801cab9ca50 ffff8801b6b279c8 ffffffff8154cb8f ffff8801b6b27c18 [ 21.145936] ffff8801b6b27c10 ffff8801b6b27c88 00003ffe3a0001e0 00000001c9678000 [ 21.153958] Call Trace: [ 21.156558] [] zap_huge_pmd+0x16f/0x860 [ 21.162181] [] unmap_page_range+0x12ad/0x1730 [ 21.168331] [] ? vm_normal_page_pmd+0x310/0x310 [ 21.174631] [] unmap_single_vma+0x101/0x260 [ 21.180578] [] unmap_vmas+0x102/0x1d0 [ 21.186005] [] exit_mmap+0x214/0x3f0 [ 21.191345] [] ? SyS_munmap+0xa0/0xa0 [ 21.196776] [] ? up_write+0x1a/0x60 [ 21.202026] [] mmput+0xf3/0x2d0 [ 21.206931] [] do_exit+0x906/0x27b0 [ 21.212184] [] ? release_task.part.19+0x1210/0x1210 [ 21.218831] [] ? up_write+0x1a/0x60 [ 21.224082] [] ? do_mprotect_pkey+0x71d/0x890 [ 21.230226] [] ? mprotect_fixup+0x930/0x930 [ 21.236194] [] do_group_exit+0x111/0x340 [ 21.241881] [] ? do_group_exit+0x340/0x340 [ 21.247757] [] SyS_exit_group+0x1d/0x20 [ 21.253376] [] do_syscall_64+0x1a6/0x490 [ 21.259068] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 21.265965] 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 [ 21.295076] RIP [] page_remove_rmap+0x37/0x6d0 [ 21.301437] RSP [ 21.305243] CR2: ffffeafff8e80020 [ 21.308673] ---[ end trace 63eba9f6f832f23c ]--- [ 21.313401] Kernel panic - not syncing: Fatal exception [ 21.319083] Dumping ftrace buffer: [ 21.322601] (ftrace buffer empty) [ 21.326398] Kernel Offset: disabled [ 21.330009] Rebooting in 86400 seconds..