[....] 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[ 13.717246] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 17.478044] random: sshd: uninitialized urandom read (32 bytes read) [ 17.794183] random: sshd: uninitialized urandom read (32 bytes read) [ 18.303265] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.13' (ECDSA) to the list of known hosts. [ 24.048069] urandom_read: 1 callbacks suppressed [ 24.048073] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 24.133725] BUG: unable to handle kernel paging request at ffffeafff91c8020 [ 24.141269] IP: [] page_remove_rmap+0x37/0x6d0 [ 24.147517] PGD 0 [ 24.149462] [ 24.151170] Oops: 0000 [#1] PREEMPT SMP KASAN [ 24.155659] Dumping ftrace buffer: [ 24.159281] (ftrace buffer empty) [ 24.162970] Modules linked in: [ 24.166367] CPU: 1 PID: 3806 Comm: syz-executor000 Not tainted 4.9.122-g54068d6 #78 [ 24.174154] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.183506] task: ffff8801b6fc1800 task.stack: ffff8801b8120000 [ 24.189540] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 24.198221] RSP: 0018:ffff8801b8127948 EFLAGS: 00010246 [ 24.203644] RAX: dffffc0000000000 RBX: ffffeafff91c8000 RCX: 0000000000000000 [ 24.211005] RDX: 1ffffd5fff239004 RSI: ffffffff814f5918 RDI: ffffeafff91c8000 [ 24.218253] RBP: ffff8801b8127970 R08: 00000000000349a0 R09: 0000000000000001 [ 24.225498] R10: ffff8801b6fc1800 R11: 0000000000000001 R12: ffff8801b8127c08 [ 24.232792] R13: ffffeafff91c8020 R14: ffffeafff91c8000 R15: 0000000000000001 [ 24.240081] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 24.248285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 24.254144] CR2: ffffeafff91c8020 CR3: 00000001c9027000 CR4: 00000000001606f0 [ 24.261462] Stack: [ 24.263592] ffffeafff91c8020 ffff8801b8127c08 ffff8801c75a1800 ffffeafff91c8000 [ 24.271591] ffff8801b6de8f20 ffff8801b81279c8 ffffffff8154cb8f ffff8801b8127c18 [ 24.279597] ffff8801b8127c10 ffff8801b8127c88 00003ffe472001e0 00000001c75a1000 [ 24.287669] Call Trace: [ 24.290234] [] zap_huge_pmd+0x16f/0x860 [ 24.295849] [] unmap_page_range+0x12ad/0x1730 [ 24.301982] [] ? vm_normal_page_pmd+0x310/0x310 [ 24.308297] [] unmap_single_vma+0x101/0x260 [ 24.314245] [] unmap_vmas+0x102/0x1d0 [ 24.319672] [] exit_mmap+0x214/0x3f0 [ 24.325013] [] ? SyS_munmap+0xa0/0xa0 [ 24.330447] [] ? up_write+0x1a/0x60 [ 24.335720] [] mmput+0xf3/0x2d0 [ 24.340633] [] do_exit+0x906/0x27b0 [ 24.345894] [] ? release_task.part.19+0x1210/0x1210 [ 24.352555] [] ? up_write+0x1a/0x60 [ 24.357807] [] ? do_mprotect_pkey+0x71d/0x890 [ 24.363932] [] ? mprotect_fixup+0x930/0x930 [ 24.370004] [] do_group_exit+0x111/0x340 [ 24.375693] [] ? do_group_exit+0x340/0x340 [ 24.381557] [] SyS_exit_group+0x1d/0x20 [ 24.387162] [] do_syscall_64+0x1a6/0x490 [ 24.392868] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 24.399928] 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 [ 24.427004] RIP [] page_remove_rmap+0x37/0x6d0 [ 24.433343] RSP [ 24.436947] CR2: ffffeafff91c8020 [ 24.440378] ---[ end trace 93115c89f3a9967b ]--- [ 24.445111] Kernel panic - not syncing: Fatal exception [ 24.450804] Dumping ftrace buffer: [ 24.454325] (ftrace buffer empty) [ 24.458015] Kernel Offset: disabled [ 24.461638] Rebooting in 86400 seconds..