[BUG] Unable to run claude code in FreeBSD Linux emulator jail

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Created a Linux jail in FreeBSD, this is like running on Ubuntu 22.04, it should work, but it fails.

```root@aitools:/# curl -fsSL https://claude.ai/install.sh | bash
Setting up Claude Code...
6 | // and may be used to improve Anthropic's products, including training models.
7 | // You are responsible for reviewing any code suggestions before use.
8 |
9 | // (c) Anthropic PBC. All rights reserved. Use is subject to the Legal Agreements outlined here: https://code.claude.com/docs/en/legal-and-compliance.
10 |
11 | var nfB=Object.create;var{getPrototypeOf:rfB,defineProperty:Fe,getOwnPropertyNames:spH,getOwnPropertyDescriptor:ofB}=Object,epH=Object.prototype.hasOwnProperty,mA=(H,$,A)=>{for(let L of spH($))if(!epH.call(H,L)&&L!=="default")Fe(H,L,{get:()=>$[L],enumerable:!0});if(A){for(let L of spH($))if(!epH.call(A,L)&&L!=="default")Fe(A,L,{get:()=>$[L],enumerable:!0});return A}},R=(H,$,A)=>{A=H!=null?nfB(rfB(H)):{};let L=$||!H||!H.__esModule?Fe(A,"default",{value:H,enumerable:!0}):A;for(let I of spH(H))if(!epH.call(L,I))Fe(L,I,{get:()=>H[I],enumerable:!0});return L},ukA=new WeakMap,Lb=(H)=>{var $=ukA.get(H),A;if($)return $;if($=Fe({},"__esModule",{value:!0}),H&&typeof H==="object"||typeof H==="function")spH(H).map((L)=>!epH.call($,L)&&Fe($,L,{get:()=>H[L],enumerable:!(A=ofB(H,L))||A.enumerable}));return ukA.set(H,$),$},N=(H,$)=>()=>($||H(($={exports:{}}).exports,$),$.exports);var UD=(H,$)=>{for(var A in $)Fe(H,A,{get:$[A],enumerable:!0,configurable:!0,set:(L)=>$[A]=()=>L})};var K=(H,$)=>()=>(H&&($=H(H=0)),$);var gkA=N((f | ... truncated

ENOENT: no such file or directory, lstat '/'
path: "/",
syscall: "lstat",
errno: -2,
code: "ENOENT"

at ymA (/$bunfs/root/claude:11:30009)
at <anonymous> (/$bunfs/root/claude:11:40632)
at <anonymous> (/$bunfs/root/claude:11:1003)
at <anonymous> (/$bunfs/root/claude:12:167)
at <anonymous> (/$bunfs/root/claude:11:1003)
at <anonymous> (/$bunfs/root/claude:14:238)
at <anonymous> (/$bunfs/root/claude:11:1003)
at <anonymous> (/$bunfs/root/claude:14:9079)
at <anonymous> (/$bunfs/root/claude:11:1003)

Bun v1.3.5 (Linux x64 baseline)```

What Should Happen?

It should work

Error Messages/Logs

Steps to Reproduce

FreeBSD Version

Latest FreeBSD FreeBSD 15.0-RELEASE

Enable Linux Compatibility

sysrc linux_enable="YES"
service linux start

echo 'linux64_load="YES"' >> /boot/loader.conf

Bootstrap Linux Userland with Debootstrap

pkg install debootstrap

# Create jail directory
mkdir -p /jails/aitools

# Bootstrap Ubuntu 22.04 (jammy) into the jail
debootstrap --arch=amd64 jammy /jails/aitools http://archive.ubuntu.com/ubuntu

Jail creation

# /etc/jail.conf

aitools {
    # HOSTNAME/PATH
    host.hostname = "aitools.jail";
    path = "/jails/aitools";

    # NETWORK - inherit host's network stack (simplest, has full internet access)
    ip4 = inherit;
    ip6 = inherit;

    # LOGGING
    exec.consolelog = "/var/log/jail_console_${name}.log";

    # Mount devfs
    mount.devfs;
    devfs_ruleset = 4;

    # Allow Linux compatibility mounts
    allow.mount;
    allow.mount.devfs;
    allow.mount.fdescfs;
    allow.mount.procfs;
    allow.mount.linprocfs;
    allow.mount.linsysfs;
    allow.mount.tmpfs;
    enforce_statfs = 1;

    # Networking
    allow.raw_sockets;

    # For Linux jails: no FreeBSD rc scripts
    exec.start = "";
    exec.stop = "";

    # Persist
    persist;
}

Enable the jail service:

sysrc jail_enable="YES"
sysrc jail_parallel_start="YES"

Configure the Linux Jail

Set up basic configuration inside the jail:

# Set up DNS resolution
echo "nameserver 1.1.1.1" > /jails/aitools/etc/resolv.conf

# Set hostname
echo "aitools" > /jails/aitools/etc/hostname

# Configure apt sources
cat > /jails/aitools/etc/apt/sources.list << 'EOF'
deb http://archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-security main restricted universe multiverse
EOF

Mount Required Filesystems

Create a script to mount Linux filesystems before starting the jail. Add to /etc/fstab.aitools:

linprocfs    /jails/aitools/proc         linprocfs    rw    0    0
linsysfs     /jails/aitools/sys          linsysfs     rw    0    0
tmpfs        /jails/aitools/dev/shm      tmpfs        rw,mode=1777    0    0
devfs        /jails/aitools/dev          devfs        rw    0    0

Create mount points and mount:

mkdir -p /jails/aitools/proc /jails/aitools/sys /jails/aitools/dev/shm
mount -F /etc/fstab.aitools -a

Start and Enter the Jail

Start the jail:

service jail start aitools

Enter the jail using Linux shell:

jexec aitools /bin/bash

Update and Install Essential Packages

Inside the jail, update the system and install prerequisites:

# Update package lists
apt update

# Upgrade existing packages
apt upgrade -y

# Install essential tools
apt install -y curl wget ca-certificates gnupg

Claude installation

root@aitools:/# curl -fsSL https://claude.ai/install.sh | bash
Setting up Claude Code...
 6 | // and may be used to improve Anthropic's products, including training models.
 7 | // You are responsible for reviewing any code suggestions before use.
 8 |
 9 | // (c) Anthropic PBC. All rights reserved. Use is subject to the Legal Agreements outlined here: https://code.claude.com/docs/en/legal-and-compliance.
10 |
11 | var nfB=Object.create;var{getPrototypeOf:rfB,defineProperty:Fe,getOwnPropertyNames:spH,getOwnPropertyDescriptor:ofB}=Object,epH=Object.prototype.hasOwnProperty,mA=(H,$,A)=>{for(let L of spH($))if(!epH.call(H,L)&&L!=="default")Fe(H,L,{get:()=>$[L],enumerable:!0});if(A){for(let L of spH($))if(!epH.call(A,L)&&L!=="default")Fe(A,L,{get:()=>$[L],enumerable:!0});return A}},R=(H,$,A)=>{A=H!=null?nfB(rfB(H)):{};let L=$||!H||!H.__esModule?Fe(A,"default",{value:H,enumerable:!0}):A;for(let I of spH(H))if(!epH.call(L,I))Fe(L,I,{get:()=>H[I],enumerable:!0});return L},ukA=new WeakMap,Lb=(H)=>{var $=ukA.get(H),A;if($)return $;if($=Fe({},"__esModule",{value:!0}),H&&typeof H==="object"||typeof H==="function")spH(H).map((L)=>!epH.call($,L)&&Fe($,L,{get:()=>H[L],enumerable:!(A=ofB(H,L))||A.enumerable}));return ukA.set(H,$),$},N=(H,$)=>()=>($||H(($={exports:{}}).exports,$),$.exports);var UD=(H,$)=>{for(var A in $)Fe(H,A,{get:$[A],enumerable:!0,configurable:!0,set:(L)=>$[A]=()=>L})};var K=(H,$)=>()=>(H&&($=H(H=0)),$);var gkA=N((f | ... truncated

ENOENT: no such file or directory, lstat '/'
    path: "/",
 syscall: "lstat",
   errno: -2,
    code: "ENOENT"

      at ymA (/$bunfs/root/claude:11:30009)
      at <anonymous> (/$bunfs/root/claude:11:40632)
      at <anonymous> (/$bunfs/root/claude:11:1003)
      at <anonymous> (/$bunfs/root/claude:12:167)
      at <anonymous> (/$bunfs/root/claude:11:1003)
      at <anonymous> (/$bunfs/root/claude:14:238)
      at <anonymous> (/$bunfs/root/claude:11:1003)
      at <anonymous> (/$bunfs/root/claude:14:9079)
      at <anonymous> (/$bunfs/root/claude:11:1003)

Bun v1.3.5 (Linux x64 baseline)

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.16

Platform

Anthropic API

Operating System

Other

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_