Re: [PATCH] drm/amdkfd: Flush the process wq before creating a kfd_process

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On 2024-04-26 14:55, Lancelot SIX wrote:
There is a race condition when re-creating a kfd_process for a process.
This has been observed when a process under the debugger executes
exec(3).  In this scenario:
- The process executes exec.
  - This will eventually release the process's mm, which will cause the
    kfd_process object associated with the process to be freed
    (kfd_process_free_notifier decrements the reference count to the
    kfd_process to 0).  This causes kfd_process_ref_release to enqueue
    kfd_process_wq_release to the kfd_process_wq.
- The debugger receives the PTRACE_EVENT_EXEC notification, and tries to
   re-enable AMDGPU traps (KFD_IOC_DBG_TRAP_ENABLE).
  - When handling this request, KFD tries to re-create a kfd_process.
    This eventually calls kfd_create_process and kobject_init_and_add.

At this point the call to kobject_init_and_add can fail because the
old kfd_process.kobj has not been freed yet by kfd_process_wq_release.

This patch proposes to avoid this race by making sure to drain
kfd_process_wq before creating a new kfd_process object.  This way, we
know that any cleanup task is done executing when we reach
kobject_init_and_add.

Signed-off-by: Lancelot SIX <lancelot.six@xxxxxxx>

Reviewed-by: Felix Kuehling <felix.kuehling@xxxxxxx>


---
  drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
index 58c1fe542193..451bb058cc62 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
@@ -829,6 +829,14 @@ struct kfd_process *kfd_create_process(struct task_struct *thread)
  	if (process) {
  		pr_debug("Process already found\n");
  	} else {
+		/* If the process just called exec(3), it is possible that the
+		 * cleanup of the kfd_process (following the release of the mm
+		 * of the old process image) is still in the cleanup work queue.
+		 * Make sure to drain any job before trying to recreate any
+		 * resource for this process.
+		 */
+		flush_workqueue(kfd_process_wq);
+
  		process = create_process(thread);
  		if (IS_ERR(process))
  			goto out;

base-commit: cf743996352e327f483dc7d66606c90276f57380



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