[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.228142] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 24.486685] random: sshd: uninitialized urandom read (32 bytes read) [ 25.023643] random: sshd: uninitialized urandom read (32 bytes read) [ 25.425712] random: sshd: uninitialized urandom read (32 bytes read) [ 30.444562] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.34' (ECDSA) to the list of known hosts. [ 36.045476] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 36.122062] BUG: unable to handle kernel paging request at ffffeafff90d8020 [ 36.129412] IP: [] page_remove_rmap+0x37/0x6d0 [ 36.135754] PGD 0 [ 36.137701] [ 36.139331] Oops: 0000 [#1] PREEMPT SMP KASAN [ 36.143806] Dumping ftrace buffer: [ 36.147325] (ftrace buffer empty) [ 36.151010] Modules linked in: [ 36.154291] CPU: 0 PID: 3795 Comm: syz-executor441 Not tainted 4.9.122-g54068d6 #78 [ 36.162055] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.171383] task: ffff8801bb09b000 task.stack: ffff8801b8a18000 [ 36.177410] RIP: 0010:[] [] page_remove_rmap+0x37/0x6d0 [ 36.186380] RSP: 0018:ffff8801b8a1f948 EFLAGS: 00010246 [ 36.191802] RAX: dffffc0000000000 RBX: ffffeafff90d8000 RCX: 0000000000000000 [ 36.199046] RDX: 1ffffd5fff21b004 RSI: ffffffff814f5918 RDI: ffffeafff90d8000 [ 36.206287] RBP: ffff8801b8a1f970 R08: 0000000000034500 R09: 0000000000000001 [ 36.213531] R10: ffff8801bb09b000 R11: 0000000000000001 R12: ffff8801b8a1fc08 [ 36.220771] R13: ffffeafff90d8020 R14: ffffeafff90d8000 R15: 0000000000000001 [ 36.228105] FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 36.236406] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 36.242266] CR2: ffffeafff90d8020 CR3: 00000001da380000 CR4: 00000000001606f0 [ 36.249512] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 36.256754] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 36.264001] Stack: [ 36.266122] ffffeafff90d8020 ffff8801b8a1fc08 ffff8801d9b38800 ffffeafff90d8000 [ 36.274112] ffff8801d932f058 ffff8801b8a1f9c8 ffffffff8154cb8f ffff8801b8a1fc18 [ 36.282123] ffff8801b8a1fc10 ffff8801b8a1fc88 00003ffe436001e0 00000001d9b38000 [ 36.290243] Call Trace: [ 36.292812] [] zap_huge_pmd+0x16f/0x860 [ 36.298585] [] unmap_page_range+0x12ad/0x1730 [ 36.304718] [] ? vm_normal_page_pmd+0x310/0x310 [ 36.311014] [] unmap_single_vma+0x101/0x260 [ 36.316968] [] unmap_vmas+0x102/0x1d0 [ 36.322388] [] exit_mmap+0x214/0x3f0 [ 36.327724] [] ? SyS_munmap+0xa0/0xa0 [ 36.333149] [] ? up_write+0x1a/0x60 [ 36.338466] [] mmput+0xf3/0x2d0 [ 36.343382] [] do_exit+0x906/0x27b0 [ 36.348641] [] ? release_task.part.19+0x1210/0x1210 [ 36.355280] [] ? up_write+0x1a/0x60 [ 36.360530] [] ? do_mprotect_pkey+0x71d/0x890 [ 36.366651] [] ? mprotect_fixup+0x930/0x930 [ 36.372713] [] do_group_exit+0x111/0x340 [ 36.378398] [] ? do_group_exit+0x340/0x340 [ 36.384253] [] SyS_exit_group+0x1d/0x20 [ 36.389849] [] do_syscall_64+0x1a6/0x490 [ 36.395540] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 36.402438] 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 [ 36.429241] RIP [] page_remove_rmap+0x37/0x6d0 [ 36.435571] RSP [ 36.439174] CR2: ffffeafff90d8020 [ 36.442602] ---[ end trace 8c769e396deb9b26 ]--- [ 36.447337] Kernel panic - not syncing: Fatal exception [ 36.452986] Dumping ftrace buffer: [ 36.456501] (ftrace buffer empty) [ 36.460186] Kernel Offset: disabled [ 36.463788] Rebooting in 86400 seconds..