chrg6
63228e7ca8
Hold a reference on an IPC session for the length of a request, and copy the transfer memory under the kernel lock.
...
SendSyncRequest looked the session up with kern_handle_get, which holds the kernel lock only for the lookup, and then
dispatched to the handler with no reference. A CloseHandle of the session's last handle on another thread meanwhile
reached ipc_handle_closed, which ran the close callback and freed the session while the handler still used it; for
the audio renderer, renderer_close joins the render thread and frees the renderer a RequestUpdate is reading.
OpenAudioRenderer read the transfer memory the same way, and a CloseHandle frees that object at once.
kernel.c gains kern_handle_hold, which runs a hold callback under the kernel lock after the lookup (handle_close
clears the slot under that lock before it calls ipc_handle_closed, so a close either comes first and the lookup
fails, or comes after and finds the extra reference), and kern_handle_copy, which copies an object under the lock.
ipc_svc takes the session with kern_handle_hold and drops the request's reference through ipc_handle_closed after the
answer, so the close callback runs on whichever thread drops the last reference; the request thread holds no service
lock by then. audren.c copies the transfer memory into a local IpcTransferMemory. Domain sub-objects are not freed
yet (IpcSession.objects), so their lookups are left for the domain object change.
Not reproduced before the change in a game run (no log shows a renderer closed during play). tests/ipc_session_check.py
builds ipc.c with kernel.c linked: a request whose handler blocks while another thread closes the session's only handle
must leave the close callback until the handler returns, and a closed transfer memory handle must copy nothing.
Against the previous ipc.c it fails with the close callback run while the handler was blocked. system_event_check,
sync_wake_check and the compile check of every runtime file pass.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com >
2026-11-13 18:41:46 -05:00
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