kernel: Fix gsp_emu_cleanup crash on dead thread (refcount saturation)

Root cause: when the gsp_emu thread crashes (e.g. fortify_panic in
gsp_rm_send), the kernel kills it. Later, gsp_emu_cleanup() calls
kthread_stop() on the dead thread, hitting refcount_warn_saturate
on the freed/saturated task_struct.

Fixes:
1. pid_alive() check before kthread_stop() - skip if thread already dead
2. get_task_struct() after kthread_run() - hold reference so the
   task_struct stays valid even after a crash
3. put_task_struct() in cleanup - release the reference

This prevents the module from getting stuck in 'going' state during
mdev removal after a gsp_emu thread crash.

0 files changed, 0 insertions, 0 deletions