[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 13.150195] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 14.854654] random: sshd: uninitialized urandom read (32 bytes read) [ 15.093944] random: sshd: uninitialized urandom read (32 bytes read) [ 15.583880] random: sshd: uninitialized urandom read (32 bytes read) [ 19.397437] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.30' (ECDSA) to the list of known hosts. [ 24.981413] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 25.068849] BUG: unable to handle kernel paging request at ffffeafff8fa8020 [ 25.076190] IP: [] page_remove_rmap+0x37/0x6d0 [ 25.082432] PGD 0 [ 25.084376] [ 25.086065] Oops: 0000 [#1] PREEMPT SMP KASAN [ 25.090541] Dumping ftrace buffer: [ 25.094052] (ftrace buffer empty) [ 25.097733] Modules linked in: [ 25.101017] CPU: 1 PID: 3803 Comm: syz-executor030 Not tainted 4.9.121-g681e57b #25 [ 25.109011] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.118338] task: ffff8801b75e6000 task.stack: ffff8801b5850000 [ 25.124362] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 25.133035] RSP: 0018:ffff8801b5857948 EFLAGS: 00010246 [ 25.138452] RAX: dffffc0000000000 RBX: ffffeafff8fa8000 RCX: 0000000000000000 [ 25.145692] RDX: 1ffffd5fff1f5004 RSI: ffffffff814f5278 RDI: ffffeafff8fa8000 [ 25.152932] RBP: ffff8801b5857970 R08: 0000000000033ce0 R09: 0000000000000001 [ 25.160173] R10: ffff8801b75e6000 R11: 0000000000000001 R12: ffff8801b5857c08 [ 25.167419] R13: ffffeafff8fa8020 R14: ffffeafff8fa8000 R15: 0000000000000001 [ 25.174671] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 25.182869] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.188720] CR2: ffffeafff8fa8020 CR3: 00000001cb35f000 CR4: 00000000001606f0 [ 25.195965] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.203205] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.210443] Stack: [ 25.212563] ffffeafff8fa8020 ffff8801b5857c08 ffff8801c8810800 ffffeafff8fa8000 [ 25.220541] ffff8801b7ba0318 ffff8801b58579c8 ffffffff8154c20f ffff8801b5857c18 [ 25.228522] ffff8801b5857c10 ffff8801b5857c88 00003ffe3ea001e0 00000001c8810000 [ 25.236521] Call Trace: [ 25.239150] [] zap_huge_pmd+0x16f/0x860 [ 25.244941] [] unmap_page_range+0x12ad/0x1730 [ 25.251061] [] ? vm_normal_page_pmd+0x2f0/0x2f0 [ 25.257354] [] unmap_single_vma+0x101/0x260 [ 25.263299] [] unmap_vmas+0x102/0x1d0 [ 25.268719] [] exit_mmap+0x214/0x3f0 [ 25.274055] [] ? SyS_munmap+0xa0/0xa0 [ 25.279478] [] ? up_write+0x1a/0x60 [ 25.284725] [] mmput+0xf3/0x2d0 [ 25.289626] [] do_exit+0x906/0x27b0 [ 25.294875] [] ? release_task.part.19+0x1210/0x1210 [ 25.301509] [] ? up_write+0x1a/0x60 [ 25.306756] [] ? do_mprotect_pkey+0x71d/0x890 [ 25.312872] [] ? mprotect_fixup+0x930/0x930 [ 25.318812] [] do_group_exit+0x111/0x340 [ 25.324495] [] ? do_group_exit+0x340/0x340 [ 25.330349] [] SyS_exit_group+0x1d/0x20 [ 25.335946] [] do_syscall_64+0x1a6/0x490 [ 25.341629] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 25.348521] 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 [ 25.375241] RIP [] page_remove_rmap+0x37/0x6d0 [ 25.381568] RSP [ 25.385163] CR2: ffffeafff8fa8020 [ 25.388592] ---[ end trace 35dab5cc42ec2592 ]--- [ 25.393320] Kernel panic - not syncing: Fatal exception [ 25.398964] Dumping ftrace buffer: [ 25.402480] (ftrace buffer empty) [ 25.406161] Kernel Offset: disabled [ 25.409761] Rebooting in 86400 seconds..