[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.591118] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 17.188650] random: sshd: uninitialized urandom read (32 bytes read) [ 17.674771] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.201749] random: sshd: uninitialized urandom read (32 bytes read) [ 22.509245] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.50' (ECDSA) to the list of known hosts. [ 28.007784] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 28.089446] BUG: unable to handle kernel paging request at ffffeafff90b0020 [ 28.096819] IP: [] page_remove_rmap+0x37/0x6d0 [ 28.103080] PGD 0 [ 28.105120] [ 28.106753] Oops: 0000 [#1] PREEMPT SMP KASAN [ 28.111345] Dumping ftrace buffer: [ 28.114933] (ftrace buffer empty) [ 28.118623] Modules linked in: [ 28.121920] CPU: 1 PID: 3787 Comm: syz-executor466 Not tainted 4.9.120-gf85543b #76 [ 28.129787] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.139121] task: ffff8801bb6fb000 task.stack: ffff8801b9660000 [ 28.145153] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 28.153836] RSP: 0018:ffff8801b9667948 EFLAGS: 00010246 [ 28.159260] RAX: dffffc0000000000 RBX: ffffeafff90b0000 RCX: 0000000000000000 [ 28.166511] RDX: 1ffffd5fff216004 RSI: ffffffff814f5128 RDI: ffffeafff90b0000 [ 28.173760] RBP: ffff8801b9667970 R08: 0000000000033e60 R09: 0000000000000001 [ 28.181006] R10: ffff8801bb6fb000 R11: 0000000000000001 R12: ffff8801b9667c08 [ 28.188366] R13: ffffeafff90b0020 R14: ffffeafff90b0000 R15: 0000000000000001 [ 28.195615] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.203817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.209672] CR2: ffffeafff90b0020 CR3: 00000001c555a000 CR4: 00000000001606f0 [ 28.217108] Stack: [ 28.219238] ffffeafff90b0020 ffff8801b9667c08 ffff8801c4772800 ffffeafff90b0000 [ 28.227239] ffff8801bacf9bb0 ffff8801b96679c8 ffffffff8154bfcf ffff8801b9667c18 [ 28.235358] ffff8801b9667c10 ffff8801b9667c88 00003ffe42c001e0 00000001c4772000 [ 28.243492] Call Trace: [ 28.246066] [] zap_huge_pmd+0x16f/0x860 [ 28.251667] [] unmap_page_range+0x12ad/0x1730 [ 28.257790] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 28.264091] [] unmap_single_vma+0x101/0x260 [ 28.270043] [] unmap_vmas+0x102/0x1d0 [ 28.275475] [] exit_mmap+0x214/0x3f0 [ 28.280817] [] ? SyS_munmap+0xa0/0xa0 [ 28.286250] [] ? up_write+0x1a/0x60 [ 28.291601] [] mmput+0xf3/0x2d0 [ 28.296507] [] do_exit+0x906/0x27b0 [ 28.301763] [] ? release_task.part.19+0x1210/0x1210 [ 28.308408] [] ? up_write+0x1a/0x60 [ 28.313821] [] ? do_mprotect_pkey+0x71d/0x890 [ 28.319943] [] ? mprotect_fixup+0x930/0x930 [ 28.325993] [] do_group_exit+0x111/0x340 [ 28.331685] [] ? do_group_exit+0x340/0x340 [ 28.337555] [] SyS_exit_group+0x1d/0x20 [ 28.343159] [] do_syscall_64+0x1a6/0x490 [ 28.348847] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 28.355745] 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 [ 28.382672] RIP [] page_remove_rmap+0x37/0x6d0 [ 28.389005] RSP [ 28.392601] CR2: ffffeafff90b0020 [ 28.396045] ---[ end trace 633037d929d96ae9 ]--- [ 28.400776] Kernel panic - not syncing: Fatal exception [ 28.406474] Dumping ftrace buffer: [ 28.409997] (ftrace buffer empty) [ 28.413686] Kernel Offset: disabled [ 28.417287] Rebooting in 86400 seconds..