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elfuse stalls at startup under any finite host RLIMIT_CPU

Abierto
#474 0 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
48/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
c, macos

Línea de trabajo

Start by reproducing with the supplied zsh command and compare behavior with no host CPU limit. The report places the stall in hv_vcpu_run (Hv::Vcpu::run_once in hv_trap), with the vCPU stuck at the same EL1 PC; inspect that execution path and the host RLIMIT_CPU setup. Done means elfuse runs the guest and prints hello under a finite host CPU limit.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Under any finite host RLIMIT_CPU, elfuse stalls before the guest produces output: test-hello prints nothing, and the vCPU watchdog ends elfuse after 10 s with status 124. The limit is nowhere near used up, so the stall comes from a finite limit being set, not from the limit firing.

Reproducer (zsh):

(ulimit -St 1000; build/elfuse build/test-hello; echo "status=$?")
host limit result
none prints hello, status 0
ulimit -St 1000 no output, vCPU execution timed out after 10s, PC=0xfeffdf6000 CPSR=0x3c5, status 124
ulimit -St 100000 same
ulimit -Ht 100000 same
ulimit -St 1000, with SIGXCPU ignored in the parent shell (trap '' XCPU) same

The same happens on 3347188 (main), e9fdbbb, and c2785c7^1, from before #448 moved guest limits into the guest table, so it is not caused by the guest table or its enforcement. Ignoring SIGXCPU does not change it, so the host signal is not what stops the guest.

A sample of a stalled process shows the main thread inside hv_vcpu_run (Hv::Vcpu::run_once in hv_trap) for the whole 2 s window, with process CPU time equal to wall time, and the vCPU at EL1 at the same PC on every run. The cause is not traced yet.

Since #448 the guest seeds its RLIMIT_CPU from the host, so a CPU limit inherited from the shell, which the RLIMIT_CPU enforcement in the follow-up PR handles, cannot be exercised until this is fixed.

Lenguaje dominante
C
Estrellas
278
Forks
31
Merge medio
2 d 22 h
PR fusionados (30 d)
17

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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