[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.626095] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.562028] random: sshd: uninitialized urandom read (32 bytes read) [ 20.013514] random: sshd: uninitialized urandom read (32 bytes read) [ 20.520561] random: sshd: uninitialized urandom read (32 bytes read) [ 20.667955] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.33' (ECDSA) to the list of known hosts. [ 26.302409] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 26.388428] BUG: unable to handle kernel paging request at ffffeafff91e8020 [ 26.395922] IP: [] page_remove_rmap+0x37/0x6d0 [ 26.402182] PGD 0 [ 26.404129] [ 26.405854] Oops: 0000 [#1] PREEMPT SMP KASAN [ 26.410329] Dumping ftrace buffer: [ 26.413844] (ftrace buffer empty) [ 26.417529] Modules linked in: [ 26.420820] CPU: 1 PID: 3798 Comm: syz-executor769 Not tainted 4.9.122-g54068d6 #78 [ 26.428588] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.438034] task: ffff8801b9394800 task.stack: ffff8801b61d8000 [ 26.444069] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 26.452857] RSP: 0018:ffff8801b61df948 EFLAGS: 00010246 [ 26.458283] RAX: dffffc0000000000 RBX: ffffeafff91e8000 RCX: 0000000000000000 [ 26.465607] RDX: 1ffffd5fff23d004 RSI: ffffffff814f5918 RDI: ffffeafff91e8000 [ 26.472861] RBP: ffff8801b61df970 R08: 00000000000342a0 R09: 0000000000000001 [ 26.480236] R10: ffff8801b9394800 R11: 0000000000000001 R12: ffff8801b61dfc08 [ 26.487710] R13: ffffeafff91e8020 R14: ffffeafff91e8000 R15: 0000000000000001 [ 26.495148] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 26.503455] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 26.509313] CR2: ffffeafff91e8020 CR3: 00000001c857d000 CR4: 00000000001606f0 [ 26.516859] Stack: [ 26.518993] ffffeafff91e8020 ffff8801b61dfc08 ffff8801bcbc6800 ffffeafff91e8000 [ 26.527051] ffff8801b6d5a5d8 ffff8801b61df9c8 ffffffff8154cb8f ffff8801b61dfc18 [ 26.535036] ffff8801b61dfc10 ffff8801b61dfc88 00003ffe47a001e0 00000001bcbc6000 [ 26.543121] Call Trace: [ 26.545694] [] zap_huge_pmd+0x16f/0x860 [ 26.551301] [] unmap_page_range+0x12ad/0x1730 [ 26.557420] [] ? vm_normal_page_pmd+0x310/0x310 [ 26.563723] [] unmap_single_vma+0x101/0x260 [ 26.569677] [] unmap_vmas+0x102/0x1d0 [ 26.575169] [] exit_mmap+0x214/0x3f0 [ 26.580515] [] ? SyS_munmap+0xa0/0xa0 [ 26.585939] [] ? up_write+0x1a/0x60 [ 26.591188] [] mmput+0xf3/0x2d0 [ 26.596140] [] do_exit+0x906/0x27b0 [ 26.601407] [] ? release_task.part.19+0x1210/0x1210 [ 26.608049] [] ? up_write+0x1a/0x60 [ 26.613307] [] ? do_mprotect_pkey+0x71d/0x890 [ 26.619429] [] ? mprotect_fixup+0x930/0x930 [ 26.625378] [] do_group_exit+0x111/0x340 [ 26.631061] [] ? do_group_exit+0x340/0x340 [ 26.636920] [] SyS_exit_group+0x1d/0x20 [ 26.642524] [] do_syscall_64+0x1a6/0x490 [ 26.648261] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 26.655167] 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 [ 26.681956] RIP [] page_remove_rmap+0x37/0x6d0 [ 26.688297] RSP [ 26.691898] CR2: ffffeafff91e8020 [ 26.695330] ---[ end trace a7961a0b58326a8f ]--- [ 26.700060] Kernel panic - not syncing: Fatal exception [ 26.705698] Dumping ftrace buffer: [ 26.709215] (ftrace buffer empty) [ 26.712900] Kernel Offset: disabled [ 26.716504] Rebooting in 86400 seconds..