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Published 1 week ago • verified publisher icon anthropics

[BUG] Claude Code crashes with unhandled EPERM when killing shell running as different user

Open HFTrader opened this issue 3 weeks ago • 1 comments

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?

When using Kill Shell to terminate a background shell that spawned a process running as a different user (e.g., sudo -u postgres psql), Claude Code crashes instead of handling the error gracefully.

Application crashes with unhandled exception and React/Ink stack trace

What Should Happen?

Error message like "Cannot kill shell: permission denied"

Error Messages/Logs

● The COUNT query on the fixings table is taking a very long time (it's a 777GB database). Let me kill that query and just verify the database is working with a simpler check:

● Kill Shell(Kill shell: ae1652)
  ⎿  Shell ae1652 killed

* Bootstrapping… (esc to interrupt · ctrl+t to hide todos · 12m 13s · ↑ 1.2k tokens)
  ⎿  ☒ Stop PostgreSQL clusters
     ☒ Drop the empty PostgreSQL 14 cluster on /var/lib
     ☒ Run pg_upgradecluster with --link to migrate v12 to v14 under /mnt/data
     ☒ Verify etf database is accessible on upgraded cluster
     ☐ Drop old PostgreSQL 12 cluster

────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
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{dimColor:B!==A.line,backgroundColor:B===A.line?"error":void 0,color:B===A.line?"text":void 0},String(B).padStart(D," 
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x1B[?2004l"),$.setRawMode(!1),$.removeListener("readable",this.handleReadable),$.unref()};flushIncomplete=()=>{if(this.incompleteEscapeTimer=null,!this.keyParseState.incomplete)return;
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795 | `.repeat(H))}var DVI;var BVI=f(()=>{DVI=N(EH(),1)});var nD1;var GVI=f(()=>{z2H();nD1=N(EH(),1)});function fH$({state:H,percentage:$}){return 
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SystemError: kill() failed: EPERM: Operation not permitted
 syscall: "kill",
   errno: 1,
    code: "EPERM"

✢ Bootstrapping… (esc to interrupt · ctrl+t to hide todos · 12m 13s · ↑ 1.2k tokens)
  ⎿  ☒ Stop PostgreSQL clusters
     ☒ Drop the empty PostgreSQL 14 cluster on /var/lib
     ☒ Run pg_upgradecluster with --link to migrate v12 to v14 under /mnt/data
     ☒ Verify etf database is accessible on upgraded cluster
     ☐ Drop old PostgreSQL 12 cluster

Steps to Reproduce

  1. Start Claude Code
  2. Run a command as a different user in the background: sudo -u postgres psql -c "SELECT pg_sleep(60);"
  3. (or any long-running command with sudo -u <other_user>)
  4. While it's running, use /tasks to find the shell ID
  5. Use the Kill Shell tool to terminate that shell
  6. Result: Claude Code crashes with EPERM: Operation not permitted

The key condition is that the shell must have spawned a child process running as a different user than the one running Claude Code.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

2.0.59 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Xterm

Additional Information

No response

HFTrader avatar Dec 06 '25 00:12 HFTrader