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yang.zhang
d4f4c50b9e
When msh tries to execute a non-ELF path, lwp_execve() may allocate a PID before lwp_load() fails. The old error path only dropped the LWP reference, leaving the PID tree entry pointing to a freed LWP. In an init-less boot flow, this can poison pid 1 after a failed command from msh. A later LWP launch may then treat the stale pid 1 entry as a valid parent LWP, resulting in invalid pgrp/session state and a job-control assertion during process exit. Add lwp_pid_rollback() for exec/spawn failures before the process becomes runnable. Unlike lwp_pid_put(), it always releases the PID lock and does not enter the "no more pid allocation" state when the PID tree becomes empty. Use the rollback helper in lwp_execve() failure paths after PID allocation. Signed-off-by: zhangyang <gaoshanliukou@163.com>