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Lunev A debugger stops every thread, so the sequence counter freezes at an odd value and the watchdog cannot tell that apart from an owner that never lets go. Attaching gdb to a running guest would report a hang that is not one. Skip the report while a tracer is attached, and restart the count so that a detach gets a full deadline before the watchdog can fire. Any ptracer sets TracerPid, so strace holds the watchdog off as well. Cc: Paolo Bonzini Cc: Richard Henderson Cc: Philippe Mathieu-Daudé Cc: Zhao Liu Signed-off-by: Denis V. Lunev --- system/cpus.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/system/cpus.c b/system/cpus.c index fe7f47ab1c3..f838cb6af7c 100644 --- a/system/cpus.c +++ b/system/cpus.c @@ -493,6 +493,10 @@ static void *bql_watchdog_fn(void *opaque) if (++stuck_polls < BQL_WATCHDOG_POLLS) { continue; } + if (qemu_debugger_attached()) { + stuck_polls = 0; + continue; + } if (seq == reported) { continue; } -- 2.53.0