[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.769295] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 20.264839] random: sshd: uninitialized urandom read (32 bytes read) [ 20.654994] random: sshd: uninitialized urandom read (32 bytes read) [ 21.143023] random: sshd: uninitialized urandom read (32 bytes read) [ 21.298405] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.19' (ECDSA) to the list of known hosts. [ 26.985729] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.069502] BUG: unable to handle kernel paging request at ffffeafff90b8020 [ 27.077303] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.083758] PGD 0 [ 27.085829] [ 27.087606] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.092091] Dumping ftrace buffer: [ 27.095623] (ftrace buffer empty) [ 27.099352] Modules linked in: [ 27.103160] CPU: 1 PID: 3785 Comm: syz-executor701 Not tainted 4.9.120-gf85543b #76 [ 27.110942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.120464] task: ffff8801ba5ae000 task.stack: ffff8801cf150000 [ 27.126541] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.135538] RSP: 0018:ffff8801cf157948 EFLAGS: 00010246 [ 27.140978] RAX: dffffc0000000000 RBX: ffffeafff90b8000 RCX: 0000000000000000 [ 27.148777] RDX: 1ffffd5fff217004 RSI: ffffffff814f5128 RDI: ffffeafff90b8000 [ 27.156315] RBP: ffff8801cf157970 R08: 0000000000033ca0 R09: 0000000000000001 [ 27.163686] R10: ffff8801ba5ae000 R11: 0000000000000001 R12: ffff8801cf157c08 [ 27.171242] R13: ffffeafff90b8020 R14: ffffeafff90b8000 R15: 0000000000000001 [ 27.179412] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 27.187627] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.193520] CR2: ffffeafff90b8020 CR3: 00000001c53d9000 CR4: 00000000001606f0 [ 27.200959] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.208221] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.215501] Stack: [ 27.217641] ffffeafff90b8020 ffff8801cf157c08 ffff8801c52d1800 ffffeafff90b8000 [ 27.225822] ffff8801b9d76688 ffff8801cf1579c8 ffffffff8154bfcf ffff8801cf157c18 [ 27.234264] ffff8801cf157c10 ffff8801cf157c88 00003ffe42e001e0 00000001c52d1000 [ 27.242534] Call Trace: [ 27.245127] [] zap_huge_pmd+0x16f/0x860 [ 27.250891] [] unmap_page_range+0x12ad/0x1730 [ 27.257184] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.263653] [] unmap_single_vma+0x101/0x260 [ 27.269625] [] unmap_vmas+0x102/0x1d0 [ 27.275071] [] exit_mmap+0x214/0x3f0 [ 27.280570] [] ? SyS_munmap+0xa0/0xa0 [ 27.286011] [] ? up_write+0x1a/0x60 [ 27.291424] [] mmput+0xf3/0x2d0 [ 27.296343] [] do_exit+0x906/0x27b0 [ 27.301616] [] ? release_task.part.19+0x1210/0x1210 [ 27.308295] [] ? up_write+0x1a/0x60 [ 27.313700] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.319953] [] ? mprotect_fixup+0x930/0x930 [ 27.325918] [] do_group_exit+0x111/0x340 [ 27.331621] [] ? do_group_exit+0x340/0x340 [ 27.337645] [] SyS_exit_group+0x1d/0x20 [ 27.343527] [] do_syscall_64+0x1a6/0x490 [ 27.349246] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.356329] 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 [ 27.384957] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.391416] RSP [ 27.395262] CR2: ffffeafff90b8020 [ 27.398874] ---[ end trace a530488a6ce2ef28 ]--- [ 27.403619] Kernel panic - not syncing: Fatal exception [ 27.409716] Dumping ftrace buffer: [ 27.413259] (ftrace buffer empty) [ 27.417130] Kernel Offset: disabled [ 27.420776] Rebooting in 86400 seconds..