SIGABRT crash: native .node addon deleted from /tmp during runtime (v2.1.42) #26057

Bug Report

Claude Code version: 2.1.42
OS: Ubuntu 24.04.2 LTS (kernel 6.11.0-1013-oem)
Architecture: AMD x86-64
RAM: 16 GB (7.8 GB available at crash time, no memory pressure)

Description

Claude Code crashes with SIGABRT (Signal 6) when a native Node.js addon (.node file) extracted to /tmp is deleted during runtime.

Crash Details

Signal: 6 (ABRT)
Module: /tmp/.7fd7ffdf9bf9ff67-00000000.node (deleted)
Coredump size: 88.3M

Stack Trace (from coredumpctl)

#0  __pthread_kill_implementation (libc.so.6 + 0x9eb2c)
#1  __GI_raise (libc.so.6 + 0x4527e)
#2  __GI_abort (libc.so.6 + 0x2898f)
#3  (claude binary + 0x3f06b58)
#4  (claude binary + 0x59a6421)
#5  (claude binary + 0x59a2dd1)
#6  (claude binary + 0x59a2e25)
#7  (claude binary + 0x59a2163)
#8  (claude binary + 0x49b74cd)
...

Root Cause Analysis

1. Claude Code extracts native .node addons to /tmp at startup (e.g., /tmp/.7fd7ffdf9bf9ff67-00000000.node)
2. The file gets deleted during execution (shown as (deleted) in coredump module listing)
3. When the runtime tries to access the addon, it triggers an assertion failure → SIGABRT

Possible Causes for File Deletion

• Claude Code internal restart/update mechanism deleting old temp files
• GC/fork behavior cleaning up temp files from parent process
• External cleanup (systemd-tmpfiles, though configured for 30d retention here)

Suggested Fix

• Use O_TMPFILE or memfd_create() to keep the file descriptor alive even if unlinked
• Or extract addons to a persistent directory (e.g., ~/.local/share/claude/native/) instead of /tmp
• Or add error handling for missing .node files with graceful restart instead of abort

Reproduction

• Single occurrence so far on this system
• Running as a long-lived process via tmux (systemd user service)
• 15 min into session when crash occurred

Environment

• systemd-tmpfiles-clean timer: active (30d retention on /tmp)
• Process was running in systemd user scope
• No OOM conditions (7.8 GB free, 0 swap used)