[....] 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[ 12.979150] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.498541] random: sshd: uninitialized urandom read (32 bytes read) [ 17.737943] random: sshd: uninitialized urandom read (32 bytes read) [ 18.246862] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.5' (ECDSA) to the list of known hosts. [ 23.841915] urandom_read: 1 callbacks suppressed [ 23.841918] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 23.931477] BUG: unable to handle kernel paging request at ffffeafff9110020 [ 23.938967] IP: [] page_remove_rmap+0x37/0x6d0 [ 23.945221] PGD 0 [ 23.947184] [ 23.948807] Oops: 0000 [#1] PREEMPT SMP KASAN [ 23.953284] Dumping ftrace buffer: [ 23.956799] (ftrace buffer empty) [ 23.960489] Modules linked in: [ 23.963784] CPU: 0 PID: 3795 Comm: syz-executor994 Not tainted 4.9.122-g54068d6 #78 [ 23.971552] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 23.980935] task: ffff8801b83ec800 task.stack: ffff8801b6340000 [ 23.986969] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 23.995650] RSP: 0018:ffff8801b6347948 EFLAGS: 00010246 [ 24.001089] RAX: dffffc0000000000 RBX: ffffeafff9110000 RCX: 0000000000000000 [ 24.008358] RDX: 1ffffd5fff222004 RSI: ffffffff814f5918 RDI: ffffeafff9110000 [ 24.015606] RBP: ffff8801b6347970 R08: 0000000000033e20 R09: 0000000000000001 [ 24.022870] R10: ffff8801b83ec800 R11: 0000000000000001 R12: ffff8801b6347c08 [ 24.030117] R13: ffffeafff9110020 R14: ffffeafff9110000 R15: 0000000000000001 [ 24.037363] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.045565] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.051424] CR2: ffffeafff9110020 CR3: 00000001bdc57000 CR4: 00000000001606f0 [ 24.058672] Stack: [ 24.060799] ffffeafff9110020 ffff8801b6347c08 ffff8801c18d5800 ffffeafff9110000 [ 24.068789] ffff8801b91bf790 ffff8801b63479c8 ffffffff8154cb8f ffff8801b6347c18 [ 24.076852] ffff8801b6347c10 ffff8801b6347c88 00003ffe444001e0 00000001c18d5000 [ 24.084846] Call Trace: [ 24.087419] [] zap_huge_pmd+0x16f/0x860 [ 24.093077] [] unmap_page_range+0x12ad/0x1730 [ 24.099207] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.105503] [] unmap_single_vma+0x101/0x260 [ 24.111517] [] unmap_vmas+0x102/0x1d0 [ 24.116954] [] exit_mmap+0x214/0x3f0 [ 24.122293] [] ? SyS_munmap+0xa0/0xa0 [ 24.127718] [] ? up_write+0x1a/0x60 [ 24.132969] [] mmput+0xf3/0x2d0 [ 24.137872] [] do_exit+0x906/0x27b0 [ 24.143124] [] ? release_task.part.19+0x1210/0x1210 [ 24.149768] [] ? up_write+0x1a/0x60 [ 24.155025] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.161146] [] ? mprotect_fixup+0x930/0x930 [ 24.167097] [] do_group_exit+0x111/0x340 [ 24.172784] [] ? do_group_exit+0x340/0x340 [ 24.178646] [] SyS_exit_group+0x1d/0x20 [ 24.184242] [] do_syscall_64+0x1a6/0x490 [ 24.189928] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.196882] 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 [ 24.223751] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.230081] RSP [ 24.233722] CR2: ffffeafff9110020 [ 24.237159] ---[ end trace bafd68444121549d ]--- [ 24.241887] Kernel panic - not syncing: Fatal exception [ 24.247485] Dumping ftrace buffer: [ 24.251001] (ftrace buffer empty) [ 24.254689] Kernel Offset: disabled [ 24.258289] Rebooting in 86400 seconds..