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Investigating Zombie Reaping Race Condition #13

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opened 2026-02-22 09:04:15 +00:00 by rawan · 0 comments
rawan commented 2026-02-22 09:04:15 +00:00
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Location: crates/chvm-init/src/signal.rs:6-25

Issue:
The guest init spawns a separate reaper thread that waits for SIGCHLD. However, there's a race between:

  1. Main thread spawning a child process
  2. Reaper thread not yet installed signal handlers
  3. Child exiting before reaper reads it

This can result in zombie processes if the child exits before the sigwait() is active.

**Location:** `crates/chvm-init/src/signal.rs:6-25` **Issue:** The guest `init` spawns a separate reaper thread that waits for SIGCHLD. However, there's a race between: 1. Main thread spawning a child process 2. Reaper thread not yet installed signal handlers 3. Child exiting before reaper reads it This can result in zombie processes if the child exits before the `sigwait()` is active.
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geomind_code/my_hypervisor#13
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