[....] 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[ 13.086585] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.195901] random: sshd: uninitialized urandom read (32 bytes read) [ 21.518460] random: sshd: uninitialized urandom read (32 bytes read) [ 21.930143] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.51' (ECDSA) to the list of known hosts. [ 27.578851] urandom_read: 1 callbacks suppressed [ 27.578855] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 27.668560] BUG: unable to handle kernel paging request at ffffeafff8f98020 [ 27.675908] IP: [] page_remove_rmap+0x37/0x6d0 [ 27.682148] PGD 0 [ 27.684095] [ 27.685719] Oops: 0000 [#1] PREEMPT SMP KASAN [ 27.690183] Dumping ftrace buffer: [ 27.693693] (ftrace buffer empty) [ 27.697374] Modules linked in: [ 27.700656] CPU: 0 PID: 3731 Comm: syz-executor086 Not tainted 4.9.121-g681e57b #77 [ 27.708417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.717744] task: ffff8801bf5d0000 task.stack: ffff8801bef10000 [ 27.723769] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 27.732490] RSP: 0018:ffff8801bef17948 EFLAGS: 00010246 [ 27.737918] RAX: dffffc0000000000 RBX: ffffeafff8f98000 RCX: 0000000000000000 [ 27.745159] RDX: 1ffffd5fff1f3004 RSI: ffffffff814f5278 RDI: ffffeafff8f98000 [ 27.752399] RBP: ffff8801bef17970 R08: 0000000000034020 R09: 0000000000000001 [ 27.759639] R10: ffff8801bf5d0000 R11: 0000000000000001 R12: ffff8801bef17c08 [ 27.766885] R13: ffffeafff8f98020 R14: ffffeafff8f98000 R15: 0000000000000001 [ 27.774231] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 27.782429] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.788284] CR2: ffffeafff8f98020 CR3: 00000001c6f1e000 CR4: 00000000001606f0 [ 27.795528] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.802777] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.810016] Stack: [ 27.812136] ffffeafff8f98020 ffff8801bef17c08 ffff8801ca469800 ffffeafff8f98000 [ 27.820115] ffff8801c5428a50 ffff8801bef179c8 ffffffff8154c20f ffff8801bef17c18 [ 27.828094] ffff8801bef17c10 ffff8801bef17c88 00003ffe3e6001e0 00000001ca469000 [ 27.836182] Call Trace: [ 27.838779] [] zap_huge_pmd+0x16f/0x860 [ 27.844383] [] unmap_page_range+0x12ad/0x1730 [ 27.850509] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 27.856801] [] unmap_single_vma+0x101/0x260 [ 27.862745] [] unmap_vmas+0x102/0x1d0 [ 27.868167] [] exit_mmap+0x214/0x3f0 [ 27.873510] [] ? SyS_munmap+0xa0/0xa0 [ 27.879036] [] mmput+0xf3/0x2d0 [ 27.883948] [] do_exit+0x906/0x27b0 [ 27.889200] [] ? release_task.part.19+0x1210/0x1210 [ 27.895838] [] ? up_write+0x1a/0x60 [ 27.901149] [] ? do_mprotect_pkey+0x71d/0x890 [ 27.907271] [] ? mprotect_fixup+0x930/0x930 [ 27.913266] [] ? key_get_type_from_user.constprop.9+0xe0/0xe0 [ 27.920784] [] do_group_exit+0x111/0x340 [ 27.926469] [] ? do_group_exit+0x340/0x340 [ 27.932427] [] SyS_exit_group+0x1d/0x20 [ 27.938033] [] do_syscall_64+0x1a6/0x490 [ 27.943718] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 27.951009] 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 [ 27.977916] RIP [] page_remove_rmap+0x37/0x6d0 [ 27.984242] RSP [ 27.987839] CR2: ffffeafff8f98020 [ 27.991265] ---[ end trace 3d4fffb82227bce2 ]--- [ 27.995992] Kernel panic - not syncing: Fatal exception [ 28.001653] Dumping ftrace buffer: [ 28.005163] (ftrace buffer empty) [ 28.008926] Kernel Offset: disabled [ 28.012531] Rebooting in 86400 seconds..