[....] 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[ 15.432105] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.160102] random: sshd: uninitialized urandom read (32 bytes read) [ 18.343565] random: sshd: uninitialized urandom read (32 bytes read) [ 18.837796] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. [ 24.645245] urandom_read: 1 callbacks suppressed [ 24.645249] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.734402] BUG: unable to handle kernel paging request at ffffeafff8fb8020 [ 24.741759] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.748002] PGD 0 [ 24.749970] [ 24.751594] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.756080] Dumping ftrace buffer: [ 24.759592] (ftrace buffer empty) [ 24.763280] Modules linked in: [ 24.766569] CPU: 0 PID: 3790 Comm: syz-executor891 Not tainted 4.9.122-g54068d6 #26 [ 24.774333] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.783662] task: ffff8801b872c800 task.stack: ffff8801b6950000 [ 24.789714] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.798405] RSP: 0018:ffff8801b6957948 EFLAGS: 00010246 [ 24.803828] RAX: dffffc0000000000 RBX: ffffeafff8fb8000 RCX: 0000000000000000 [ 24.811086] RDX: 1ffffd5fff1f7004 RSI: ffffffff814f5918 RDI: ffffeafff8fb8000 [ 24.818332] RBP: ffff8801b6957970 R08: 0000000000033b80 R09: 0000000000000001 [ 24.825575] R10: ffff8801b872c800 R11: 0000000000000001 R12: ffff8801b6957c08 [ 24.832816] R13: ffffeafff8fb8020 R14: ffffeafff8fb8000 R15: 0000000000000001 [ 24.840073] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 24.848273] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.854153] CR2: ffffeafff8fb8020 CR3: 00000001c5ed0000 CR4: 00000000001606f0 [ 24.861412] Stack: [ 24.863534] ffffeafff8fb8020 ffff8801b6957c08 ffff8801c5fac800 ffffeafff8fb8000 [ 24.871539] ffff8801b6e37630 ffff8801b69579c8 ffffffff8154cb8f ffff8801b6957c18 [ 24.879526] ffff8801b6957c10 ffff8801b6957c88 00003ffe3ee001e0 00000001c5fac000 [ 24.887515] Call Trace: [ 24.890085] [] zap_huge_pmd+0x16f/0x860 [ 24.895684] [] unmap_page_range+0x12ad/0x1730 [ 24.901802] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.908099] [] unmap_single_vma+0x101/0x260 [ 24.914042] [] unmap_vmas+0x102/0x1d0 [ 24.919474] [] exit_mmap+0x214/0x3f0 [ 24.924813] [] ? SyS_munmap+0xa0/0xa0 [ 24.930242] [] ? up_write+0x1a/0x60 [ 24.935492] [] mmput+0xf3/0x2d0 [ 24.940395] [] do_exit+0x906/0x27b0 [ 24.945646] [] ? release_task.part.19+0x1210/0x1210 [ 24.952284] [] ? up_write+0x1a/0x60 [ 24.957534] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.963653] [] ? mprotect_fixup+0x930/0x930 [ 24.969601] [] do_group_exit+0x111/0x340 [ 24.975287] [] ? do_group_exit+0x340/0x340 [ 24.981145] [] SyS_exit_group+0x1d/0x20 [ 24.986745] [] do_syscall_64+0x1a6/0x490 [ 24.992435] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.999328] 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 [ 25.026260] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.032591] RSP [ 25.036228] CR2: ffffeafff8fb8020 [ 25.039659] ---[ end trace 283af61ec559d683 ]--- [ 25.044387] Kernel panic - not syncing: Fatal exception [ 25.050039] Dumping ftrace buffer: [ 25.053561] (ftrace buffer empty) [ 25.057245] Kernel Offset: disabled [ 25.060844] Rebooting in 86400 seconds..