[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.095315] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 15.799937] random: sshd: uninitialized urandom read (32 bytes read) [ 16.046164] random: sshd: uninitialized urandom read (32 bytes read) Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 16.555597] random: sshd: uninitialized urandom read (32 bytes read) [ 16.696580] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. [ 22.290267] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 22.374415] BUG: unable to handle kernel paging request at ffffeafff9138020 [ 22.381758] IP: [] page_remove_rmap+0x37/0x6d0 [ 22.388092] PGD 0 [ 22.390035] [ 22.391655] Oops: 0000 [#1] PREEMPT SMP KASAN [ 22.396139] Dumping ftrace buffer: [ 22.399650] (ftrace buffer empty) [ 22.403331] Modules linked in: [ 22.406615] CPU: 0 PID: 3794 Comm: syz-executor914 Not tainted 4.9.121-g681e57b #25 [ 22.414378] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 22.423705] task: ffff8801b6cab000 task.stack: ffff8801b6160000 [ 22.429749] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 22.438422] RSP: 0018:ffff8801b6167948 EFLAGS: 00010246 [ 22.443841] RAX: dffffc0000000000 RBX: ffffeafff9138000 RCX: 0000000000000000 [ 22.451086] RDX: 1ffffd5fff227004 RSI: ffffffff814f5278 RDI: ffffeafff9138000 [ 22.458330] RBP: ffff8801b6167970 R08: 0000000000033ae0 R09: 0000000000000001 [ 22.465583] R10: ffff8801b6cab000 R11: 0000000000000001 R12: ffff8801b6167c08 [ 22.472830] R13: ffffeafff9138020 R14: ffffeafff9138000 R15: 0000000000000001 [ 22.480076] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 22.488275] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.494128] CR2: ffffeafff9138020 CR3: 00000001c9078000 CR4: 00000000001606f0 [ 22.501373] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.508614] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.515856] Stack: [ 22.517980] ffffeafff9138020 ffff8801b6167c08 ffff8801caf86800 ffffeafff9138000 [ 22.525963] ffff8801b7021420 ffff8801b61679c8 ffffffff8154c20f ffff8801b6167c18 [ 22.533941] ffff8801b6167c10 ffff8801b6167c88 00003ffe44e001e0 00000001caf86000 [ 22.541920] Call Trace: [ 22.544482] [] zap_huge_pmd+0x16f/0x860 [ 22.550083] [] unmap_page_range+0x12ad/0x1730 [ 22.556204] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 22.562496] [] unmap_single_vma+0x101/0x260 [ 22.568449] [] unmap_vmas+0x102/0x1d0 [ 22.573871] [] exit_mmap+0x214/0x3f0 [ 22.579210] [] ? SyS_munmap+0xa0/0xa0 [ 22.584634] [] ? up_write+0x1a/0x60 [ 22.589894] [] mmput+0xf3/0x2d0 [ 22.594796] [] do_exit+0x906/0x27b0 [ 22.600056] [] ? release_task.part.19+0x1210/0x1210 [ 22.606697] [] ? up_write+0x1a/0x60 [ 22.611948] [] ? do_mprotect_pkey+0x71d/0x890 [ 22.618065] [] ? mprotect_fixup+0x930/0x930 [ 22.624011] [] do_group_exit+0x111/0x340 [ 22.629694] [] ? do_group_exit+0x340/0x340 [ 22.635549] [] SyS_exit_group+0x1d/0x20 [ 22.641154] [] do_syscall_64+0x1a6/0x490 [ 22.646839] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 22.653735] 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 [ 22.680532] RIP [] page_remove_rmap+0x37/0x6d0 [ 22.686875] RSP [ 22.690475] CR2: ffffeafff9138020 [ 22.693903] ---[ end trace 851e2b1e00b074c2 ]--- [ 22.698628] Kernel panic - not syncing: Fatal exception [ 22.704355] Dumping ftrace buffer: [ 22.707874] (ftrace buffer empty) [ 22.711557] Kernel Offset: disabled [ 22.715180] Rebooting in 86400 seconds..