[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.428870] 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: [ 26.506662] random: sshd: uninitialized urandom read (32 bytes read) [ 26.778711] random: sshd: uninitialized urandom read (32 bytes read) [ 27.275013] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.18' (ECDSA) to the list of known hosts. [ 32.915072] urandom_read: 1 callbacks suppressed [ 32.915075] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 33.006435] BUG: unable to handle kernel paging request at ffffeafff9120020 [ 33.013800] IP: [] page_remove_rmap+0x37/0x6d0 [ 33.020059] PGD 0 [ 33.022009] [ 33.023631] Oops: 0000 [#1] PREEMPT SMP KASAN [ 33.028102] Dumping ftrace buffer: [ 33.031655] (ftrace buffer empty) [ 33.035344] Modules linked in: [ 33.038631] CPU: 0 PID: 3749 Comm: syz-executor603 Not tainted 4.9.122-g54068d6 #78 [ 33.046433] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 33.055774] task: ffff8801bef64800 task.stack: ffff8801bd220000 [ 33.061804] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 33.070480] RSP: 0018:ffff8801bd227948 EFLAGS: 00010246 [ 33.075899] RAX: dffffc0000000000 RBX: ffffeafff9120000 RCX: ffffea0006ed8000 [ 33.083145] RDX: 1ffffd5fff224004 RSI: ffffffff814f5918 RDI: ffffeafff9120000 [ 33.090397] RBP: ffff8801bd227970 R08: 0000000000034260 R09: 0000000000000001 [ 33.097768] R10: ffff8801bef64800 R11: 0000000000000001 R12: ffff8801bd227c08 [ 33.105013] R13: ffffeafff9120020 R14: ffffeafff9120000 R15: 0000000000000001 [ 33.112259] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 33.120456] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 33.126311] CR2: ffffeafff9120020 CR3: 00000001c5050000 CR4: 00000000001606f0 [ 33.133558] Stack: [ 33.135682] ffffeafff9120020 ffff8801bd227c08 ffff8801c504d808 ffffeafff9120000 [ 33.143661] ffff8801c2716898 ffff8801bd2279c8 ffffffff8154cb8f ffff8801bd227c18 [ 33.151696] ffff8801bd227c10 ffff8801bd227c88 00003ffe448001a0 00000001c504d000 [ 33.159693] Call Trace: [ 33.162257] [] zap_huge_pmd+0x16f/0x860 [ 33.167858] [] unmap_page_range+0x12ad/0x1730 [ 33.173985] [] ? vm_normal_page_pmd+0x310/0x310 [ 33.180304] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 33.187209] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 33.194024] [] unmap_single_vma+0x101/0x260 [ 33.199968] [] unmap_vmas+0x102/0x1d0 [ 33.205394] [] exit_mmap+0x214/0x3f0 [ 33.210729] [] ? SyS_munmap+0xa0/0xa0 [ 33.216155] [] ? up_write+0x1a/0x60 [ 33.221407] [] mmput+0xf3/0x2d0 [ 33.226310] [] do_exit+0x906/0x27b0 [ 33.231565] [] ? release_task.part.19+0x1210/0x1210 [ 33.238205] [] ? up_write+0x1a/0x60 [ 33.243454] [] ? do_mprotect_pkey+0x71d/0x890 [ 33.249572] [] ? mprotect_fixup+0x930/0x930 [ 33.255520] [] do_group_exit+0x111/0x340 [ 33.261219] [] ? do_group_exit+0x340/0x340 [ 33.267078] [] SyS_exit_group+0x1d/0x20 [ 33.272675] [] do_syscall_64+0x1a6/0x490 [ 33.278363] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 33.285405] 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 [ 33.312361] RIP [] page_remove_rmap+0x37/0x6d0 [ 33.318706] RSP [ 33.322332] CR2: ffffeafff9120020 [ 33.325757] ---[ end trace a6042dc44163a346 ]--- [ 33.330497] Kernel panic - not syncing: Fatal exception [ 33.336185] Dumping ftrace buffer: [ 33.339707] (ftrace buffer empty) [ 33.343389] Kernel Offset: disabled [ 33.346987] Rebooting in 86400 seconds..