[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.902132] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.827402] random: sshd: uninitialized urandom read (32 bytes read) [ 18.105301] random: sshd: uninitialized urandom read (32 bytes read) [ 18.624846] random: sshd: uninitialized urandom read (32 bytes read) [ 25.251343] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.31' (ECDSA) to the list of known hosts. [ 31.000623] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 31.084057] BUG: unable to handle kernel paging request at ffffeafff9070020 [ 31.091403] IP: [] page_remove_rmap+0x37/0x6d0 [ 31.097643] PGD 0 [ 31.099588] [ 31.101212] Oops: 0000 [#1] PREEMPT SMP KASAN [ 31.105677] Dumping ftrace buffer: [ 31.109187] (ftrace buffer empty) [ 31.112869] Modules linked in: [ 31.116160] CPU: 1 PID: 3788 Comm: syz-executor606 Not tainted 4.9.121-g681e57b #77 [ 31.123922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.133264] task: ffff8801bbfe9800 task.stack: ffff8801d9880000 [ 31.139290] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 31.147962] RSP: 0018:ffff8801d9887948 EFLAGS: 00010246 [ 31.153382] RAX: dffffc0000000000 RBX: ffffeafff9070000 RCX: 0000000000000000 [ 31.160621] RDX: 1ffffd5fff20e004 RSI: ffffffff814f5278 RDI: ffffeafff9070000 [ 31.167863] RBP: ffff8801d9887970 R08: 0000000000034280 R09: 0000000000000001 [ 31.175103] R10: ffff8801bbfe9800 R11: 0000000000000001 R12: ffff8801d9887c08 [ 31.182345] R13: ffffeafff9070020 R14: ffffeafff9070000 R15: 0000000000000001 [ 31.189589] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 31.197787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 31.203653] CR2: ffffeafff9070020 CR3: 00000001cb697000 CR4: 00000000001606f0 [ 31.210896] Stack: [ 31.213033] ffffeafff9070020 ffff8801d9887c08 ffff8801cb6a1800 ffffeafff9070000 [ 31.221019] ffff8801b8e49108 ffff8801d98879c8 ffffffff8154c20f ffff8801d9887c18 [ 31.229029] ffff8801d9887c10 ffff8801d9887c88 00003ffe41c001e0 00000001cb6a1000 [ 31.237066] Call Trace: [ 31.239632] [] zap_huge_pmd+0x16f/0x860 [ 31.245230] [] unmap_page_range+0x12ad/0x1730 [ 31.251354] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 31.257647] [] unmap_single_vma+0x101/0x260 [ 31.263633] [] unmap_vmas+0x102/0x1d0 [ 31.269066] [] exit_mmap+0x214/0x3f0 [ 31.274405] [] ? SyS_munmap+0xa0/0xa0 [ 31.279836] [] ? up_write+0x1a/0x60 [ 31.285088] [] mmput+0xf3/0x2d0 [ 31.289993] [] do_exit+0x906/0x27b0 [ 31.295253] [] ? release_task.part.19+0x1210/0x1210 [ 31.301923] [] ? up_write+0x1a/0x60 [ 31.307181] [] ? do_mprotect_pkey+0x71d/0x890 [ 31.313376] [] ? mprotect_fixup+0x930/0x930 [ 31.319341] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 31.326854] [] do_group_exit+0x111/0x340 [ 31.332544] [] ? do_group_exit+0x340/0x340 [ 31.338407] [] SyS_exit_group+0x1d/0x20 [ 31.344146] [] do_syscall_64+0x1a6/0x490 [ 31.349841] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 31.356739] Code: 55 41 54 53 48 89 fb e8 c8 b6 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 93 b6 e6 [ 31.383914] RIP [] page_remove_rmap+0x37/0x6d0 [ 31.390257] RSP [ 31.393855] CR2: ffffeafff9070020 [ 31.397283] ---[ end trace 8a0ad8f6460423dd ]--- [ 31.402123] Kernel panic - not syncing: Fatal exception [ 31.407776] Dumping ftrace buffer: [ 31.411297] (ftrace buffer empty) [ 31.414982] Kernel Offset: disabled [ 31.418629] Rebooting in 86400 seconds..