This message is primarily directed at Steve, but anyone else who
happens to know the answer, feel free to jump in. I've recently run gem5
through valgrind in timing mode with caches enabled and an error pops up
that I've been unable to come up with a solution to.
==4912== Invalid
read of size 4
==4912== at 0x4AFE14:
MemCmd::testCmdAttrib(MemCmd::Attribute) const (packet.hh:164)
==4912==
by 0x4AFE4D: MemCmd::needsResponse() const (packet.hh:175)
==4912== by
0x4AFE68: Packet::needsResponse() const (packet.hh:415)
==4912== by
0x9857A1: MSHR::isForwardNoResponse() const (mshr.hh:266)
==4912== by
0x9C2F87: MSHR::markInService(Packet*) (mshr.cc:215)
==4912== by
0x9C7466: MSHRQueue::markInService(MSHR*, Packet*)
(mshr_queue.cc:202)
==4912== by 0x988796:
BaseCache::markInServiceInternal(MSHR*, Packet*) (base.hh:179)
==4912==
by 0x988800: Cache::markInService(MSHR*, Packet*)
(cache_impl.hh:262)
==4912== by 0x999939:
Cache::MemSidePort::sendPacket() (cache_impl.hh:1711)
==4912== by
0x99A146: Cache::MemSidePort::recvRetry() (cache_impl.hh:1741)
==4912==
by 0x6F8E45: Port::sendRetry() (port.hh:212)
==4912== by 0x92F5D5:
Bus::recvRetry(int) (bus.cc:305)
==4912== Address 0x18ecb46c is 12 bytes
inside a block of size 88 free'd
==4912== at 0x4A0618C: operator
delete(void*) (vg_replace_malloc.c:342)
==4912== by 0x9407D9:
Packet::~Packet() (packet.hh:570)
==4912== by 0x99FAE7:
Cache::timingAccess(Packet*) (cache_impl.hh:527)
==4912== by 0x9A057D:
Cache::CpuSidePort::recvTiming(Packet*) (cache_impl.hh:1583)
==4912== by
0x5A0D73: Port::sendTiming(Packet*) (port.hh:186)
==4912== by 0x931281:
Bus::recvTiming(Packet*) (bus.cc:265)
==4912== by 0x93C483:
Bus::BusPort::recvTiming(Packet*) (bus.hh:89)
==4912== by 0x5A0D73:
Port::sendTiming(Packet*) (port.hh:186)
==4912== by 0x9991E9:
Cache::MemSidePort::sendPacket() (cache_impl.hh:1702)
==4912== by
0x99A146: Cache::MemSidePort::recvRetry() (cache_impl.hh:1741)
==4912==
by 0x6F8E45: Port::sendRetry() (port.hh:212)
==4912== by 0x92F5D5:
Bus::recvRetry(int) (bus.cc:305)
I've tracked it down to the
following:
// check for non-response packets (requests & writebacks)
PacketPtr pkt = myCache()->getTimingPacket();
if (pkt == NULL) {
....
} else {
MSHR *mshr = dynamic_cast(pkt->senderState);
bool success =
sendTiming(pkt);
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