[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.507840] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.439080] random: sshd: uninitialized urandom read (32 bytes read) [ 16.724397] random: sshd: uninitialized urandom read (32 bytes read) [ 17.249526] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.23' (ECDSA) to the list of known hosts. [ 22.922806] urandom_read: 1 callbacks suppressed [ 22.922809] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.012662] BUG: unable to handle kernel paging request at ffffeafff8e10020 [ 23.020036] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.026487] PGD 0 [ 23.028440] [ 23.030096] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.034688] Dumping ftrace buffer: [ 23.038207] (ftrace buffer empty) [ 23.041891] Modules linked in: [ 23.045194] CPU: 0 PID: 3786 Comm: syz-executor410 Not tainted 4.9.122-g54068d6 #26 [ 23.052966] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.062373] task: ffff8801b88e1800 task.stack: ffff8801b8a10000 [ 23.068416] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.077099] RSP: 0018:ffff8801b8a17948 EFLAGS: 00010246 [ 23.082522] RAX: dffffc0000000000 RBX: ffffeafff8e10000 RCX: 0000000000000000 [ 23.089771] RDX: 1ffffd5fff1c2004 RSI: ffffffff814f5918 RDI: ffffeafff8e10000 [ 23.097015] RBP: ffff8801b8a17970 R08: 0000000000033d40 R09: 0000000000000001 [ 23.104333] R10: ffff8801b88e1800 R11: 0000000000000001 R12: ffff8801b8a17c08 [ 23.111650] R13: ffffeafff8e10020 R14: ffffeafff8e10000 R15: 0000000000000001 [ 23.118905] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 23.127210] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 23.133071] CR2: ffffeafff8e10020 CR3: 00000001ca881000 CR4: 00000000001606f0 [ 23.140313] Stack: [ 23.142442] ffffeafff8e10020 ffff8801b8a17c08 ffff8801ca873800 ffffeafff8e10000 [ 23.150471] ffff8801b8b1a738 ffff8801b8a179c8 ffffffff8154cb8f ffff8801b8a17c18 [ 23.158636] ffff8801b8a17c10 ffff8801b8a17c88 00003ffe384001e0 00000001ca873000 [ 23.166666] Call Trace: [ 23.169277] [] zap_huge_pmd+0x16f/0x860 [ 23.174881] [] unmap_page_range+0x12ad/0x1730 [ 23.181113] [] ? vm_normal_page_pmd+0x310/0x310 [ 23.187409] [] unmap_single_vma+0x101/0x260 [ 23.193357] [] unmap_vmas+0x102/0x1d0 [ 23.198804] [] exit_mmap+0x214/0x3f0 [ 23.204257] [] ? SyS_munmap+0xa0/0xa0 [ 23.209686] [] ? up_write+0x1a/0x60 [ 23.215052] [] mmput+0xf3/0x2d0 [ 23.219962] [] do_exit+0x906/0x27b0 [ 23.225214] [] ? release_task.part.19+0x1210/0x1210 [ 23.231864] [] ? up_write+0x1a/0x60 [ 23.237123] [] ? do_mprotect_pkey+0x71d/0x890 [ 23.243251] [] ? mprotect_fixup+0x930/0x930 [ 23.249203] [] do_group_exit+0x111/0x340 [ 23.254888] [] ? do_group_exit+0x340/0x340 [ 23.260749] [] SyS_exit_group+0x1d/0x20 [ 23.266346] [] do_syscall_64+0x1a6/0x490 [ 23.272034] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 23.278932] 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 [ 23.306012] RIP [] page_remove_rmap+0x37/0x6d0 [ 23.312390] RSP [ 23.316125] CR2: ffffeafff8e10020 [ 23.319555] ---[ end trace c8dcb71a331eeae3 ]--- [ 23.324282] Kernel panic - not syncing: Fatal exception [ 23.330040] Dumping ftrace buffer: [ 23.333559] (ftrace buffer empty) [ 23.337256] Kernel Offset: disabled [ 23.340861] Rebooting in 86400 seconds..