[....] 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[ 14.375635] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.114160] random: sshd: uninitialized urandom read (32 bytes read) [ 22.504128] random: sshd: uninitialized urandom read (32 bytes read) [ 22.944852] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. [ 28.850674] urandom_read: 1 callbacks suppressed [ 28.850677] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.940714] BUG: unable to handle kernel paging request at ffffeafff8e50020 [ 28.948079] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.954332] PGD 0 [ 28.956283] [ 28.957914] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.962390] Dumping ftrace buffer: [ 28.965905] (ftrace buffer empty) [ 28.969594] Modules linked in: [ 28.972885] CPU: 1 PID: 3802 Comm: syz-executor115 Not tainted 4.9.121-g681e57b #25 [ 28.980649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.989979] task: ffff8801b72e1800 task.stack: ffff8801ba4a0000 [ 28.996072] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 29.004762] RSP: 0018:ffff8801ba4a7948 EFLAGS: 00010246 [ 29.010189] RAX: dffffc0000000000 RBX: ffffeafff8e50000 RCX: 0000000000000000 [ 29.017453] RDX: 1ffffd5fff1ca004 RSI: ffffffff814f5278 RDI: ffffeafff8e50000 [ 29.024706] RBP: ffff8801ba4a7970 R08: 0000000000033cc0 R09: 0000000000000001 [ 29.031954] R10: ffff8801b72e1800 R11: 0000000000000001 R12: ffff8801ba4a7c08 [ 29.039201] R13: ffffeafff8e50020 R14: ffffeafff8e50000 R15: 0000000000000001 [ 29.046522] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 29.054734] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 29.060597] CR2: ffffeafff8e50020 CR3: 00000001c545f000 CR4: 00000000001606f0 [ 29.067843] Stack: [ 29.069970] ffffeafff8e50020 ffff8801ba4a7c08 ffff8801c54be800 ffffeafff8e50000 [ 29.077964] ffff8801b78325d8 ffff8801ba4a79c8 ffffffff8154c20f ffff8801ba4a7c18 [ 29.085957] ffff8801ba4a7c10 ffff8801ba4a7c88 00003ffe394001e0 00000001c54be000 [ 29.094080] Call Trace: [ 29.096646] [] zap_huge_pmd+0x16f/0x860 [ 29.102360] [] unmap_page_range+0x12ad/0x1730 [ 29.108491] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 29.114910] [] unmap_single_vma+0x101/0x260 [ 29.120868] [] unmap_vmas+0x102/0x1d0 [ 29.126617] [] exit_mmap+0x214/0x3f0 [ 29.131966] [] ? SyS_munmap+0xa0/0xa0 [ 29.137403] [] ? up_write+0x1a/0x60 [ 29.142666] [] mmput+0xf3/0x2d0 [ 29.147581] [] do_exit+0x906/0x27b0 [ 29.152845] [] ? release_task.part.19+0x1210/0x1210 [ 29.159495] [] ? up_write+0x1a/0x60 [ 29.164755] [] ? do_mprotect_pkey+0x71d/0x890 [ 29.170886] [] ? mprotect_fixup+0x930/0x930 [ 29.176852] [] do_group_exit+0x111/0x340 [ 29.182551] [] ? do_group_exit+0x340/0x340 [ 29.188424] [] SyS_exit_group+0x1d/0x20 [ 29.194035] [] do_syscall_64+0x1a6/0x490 [ 29.199730] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 29.206632] 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 [ 29.233568] RIP [] page_remove_rmap+0x37/0x6d0 [ 29.239916] RSP [ 29.243514] CR2: ffffeafff8e50020 [ 29.246946] ---[ end trace 39756fca243c7b94 ]--- [ 29.251680] Kernel panic - not syncing: Fatal exception [ 29.257343] Dumping ftrace buffer: [ 29.260882] (ftrace buffer empty) [ 29.264575] Kernel Offset: disabled [ 29.268179] Rebooting in 86400 seconds..