gdbstub: handle a potentially racing TaskState

When dealing with multi-threaded userspace programs there is a race
condition with the addition of cpu->opaque (aka TaskState). This is
due to cpu_copy calling cpu_create which updates the global vCPU list.
However the task state isn't set until later. This shouldn't be a
problem because the new thread can't have executed anything yet but
the gdbstub code does liberally iterate through the CPU list in
various places.

This sticking plaster ensure the not yet fully realized vCPU is given
an pid of -1 which should be enough to ensure it doesn't show up
anywhere else.

In the longer term I think the code that manages the association
between vCPUs and attached GDB processes could do with a clean-up and
re-factor.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/730
Message-Id: <20211129140932.4115115-6-alex.bennee@linaro.org>

diff --git a/gdbstub.c b/gdbstub.c
index 23baaef40e1bc49dd7e28a7545278635ac5b0cd1..141d7bc4ec151342a29f0d8baf212dc722f942fa 100644 (file)
--- a/gdbstub.c
+++ b/gdbstub.c
@@ -94,7 +94,7 @@ static inline int cpu_gdb_index(CPUState *cpu)
 {
 #if defined(CONFIG_USER_ONLY)
     TaskState *ts = (TaskState *) cpu->opaque;
-    return ts->ts_tid;
+    return ts ? ts->ts_tid : -1;
 #else
     return cpu->cpu_index + 1;
 #endif