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Taken from: <https://salsa.debian.org/glibc-team/glibc/-/blob/027f94215a633cbf53794d4b48675fde36706e35/debian/patches/hurd-i386/local-intr-msg-clobber.diff>
Force putting save_data on the stack rather than in SSE register
The signal management does not yet properly save SSE state, so that save_data
would get overwritten by signal handlers, notably leading to `` shell
replacement getting empty content because then the io_read RPC retry gets an
MIG_BAD_ARGUMENTS error.
XXX: This is only temporary to fix the common shll replacement issue, and is
waiting for proper SSE state restoration.
Index: glibc-2.38/hurd/intr-msg.c
===================================================================
--- glibc-2.38.orig/hurd/intr-msg.c
+++ glibc-2.38/hurd/intr-msg.c
@@ -66,7 +66,7 @@ _hurd_intr_rpc_mach_msg (mach_msg_header
mach_msg_bits_t msgh_bits;
mach_port_t remote_port;
mach_msg_id_t msgid;
- struct clobber save_data;
+ volatile struct clobber save_data;
if ((option & (MACH_SEND_MSG|MACH_RCV_MSG)) != (MACH_SEND_MSG|MACH_RCV_MSG)
|| _hurd_msgport_thread == MACH_PORT_NULL)
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