Crash in DrawZoneTrace

[TrianglesPCT]

This is with latest version on github 0.8.4 compiled with vs2019

Running Windows 10, app was running without Admin privileges.

I had been using Tracy alot before this happened, so the crash is not a regular thing.

Ran the game for a only maybe 30 seconds, closed it. Was viewing the result in Tracy when I clicked on one of the zones and it crashed here.

     Tracy.exe!tracy::DrawZoneTrace<tracy::ZoneEvent const *>(const tracy::ZoneEvent * zone, const std::vector<tracy::ZoneEvent   const      *,std::allocator<tracy::ZoneEvent const *>> & trace, const tracy::Worker & worker, tracy::BuzzAnim<void const *> & anim, tracy::View &  view, bool & showUnknownFrames, std::function<void __cdecl(tracy::ZoneEvent const *,int &)> showZone) Line 238	C++
Tracy.exe!tracy::View::DrawZoneInfoWindow() Line 978	C++

[Inline Frame] Tracy.exe!tracy::View::DrawInfoWindow() Line 280	C++

Tracy.exe!tracy::View::DrawImpl() Line 975	C++

Tracy.exe!tracy::View::Draw() Line 584	C++

Tracy.exe!DrawContents() Line 738	C++

[Inline Frame] Tracy.exe!std::_Func_class<void>::operator()() Line 968	C++

[Inline Frame] Tracy.exe!Backend::Run() Line 113	C++

Tracy.exe!main(int argc, char * * argv) Line 247	C++

Because: Unhandled exception thrown: read access violation. cs was 0xFFFFFFFFFFFFFFFF.

This is the line:

 auto& cs = worker.GetCallstack( lcv );
 const auto csz = cs.size();

Locals mostly not visible but here is what It showed:

`

	Name	Value	Type
	$L0	Variable is optimized away and not available.
	$L0	Variable is optimized away and not available.
▶	anim	{active=false time=0.00000000 id=0x0000000000000000 }	tracy::BuzzAnim<void const *> &
	ccv	Variable is optimized away and not available.
▶	cs	{m_size=??? m_hash=??? m_ptr={m_ptr=0x0000ffff01000005 <Error reading characters of string.> } }	const tracy::VarArraytracy::CallstackFrameId &
	csz	Variable is optimized away and not available.
	curr	Variable is optimized away and not available.
	currCs	Variable is optimized away and not available.
	expand	Variable is optimized away and not available.
	fidx	1	int
	fileName	Variable is optimized away and not available.
	fileName	Variable is optimized away and not available.
	frame	Variable is optimized away and not available.
	frame	Variable is optimized away and not available.
	frameData	Variable is optimized away and not available.
	frameData	Variable is optimized away and not available.
	frameName	Variable is optimized away and not available.
	frameName	Variable is optimized away and not available.
	i	2691135205680	unsigned __int64
	idx	Variable is optimized away and not available.
▶	last	0x00000272a7e39a5f {_start_srcloc=60897853308931 _child2=54 _end_child1=1623668574322688 ...}	const tracy::ZoneEvent *
	lcv	3276800	const unsigned int
	normalized	Variable is optimized away and not available.
	normalized	Variable is optimized away and not available.
	pcv	Variable is optimized away and not available.
	pf	Variable is optimized away and not available.
	prev	Variable is optimized away and not available.
▶	prevCs	{m_size=0 m_hash=0 m_ptr={m_ptr=0x000000d88e8fdc7f "" } }	const tracy::VarArraytracy::CallstackFrameId &
	shortenName	114 'r'	tracy::ShortenName
	showUnknownFrames	true	bool &
▶	showZone	{idx=0 __this=0x00000272a1735dd0 {m_showRanges=false m_statRange={min=0 max=0 active=false ...} m_waitStackRange=...} }	std::function<void __cdecl(tracy::ZoneEvent const *,int &)>
	sz	2691358231216	const unsigned __int64
	time	12.0000000	const float
	time	Variable is optimized away and not available.
▶	trace	{ size=0 }	const std::vector<tracy::ZoneEvent const *,std::allocator<tracy::ZoneEvent const *>> &
▶	view	{m_showRanges=false m_statRange={min=0 max=0 active=false ...} m_waitStackRange={min=0 max=0 active=...} ...}	tracy::View &
▶	worker	{m_sock={m_buf=0x00000272a1a80020 "˜\x5" m_bufPtr=0x00000272a1a805bc "\xf5º‚\x1dË\x2# ê\x18\x6/Ð7U\x5\x17&^{Ó\x4AÀŒ0\n?\x17\x1f A" ...} ...}	const tracy::Worker &
	zone	Variable is optimized away and not available.

`

[wolfpld]

This is with latest version on github 0.8.4 compiled with vs2019

This is not actionable without an exact revision.

[TrianglesPCT]

Should be 49bda91 as I had just downloaded it compiled it fresh earlier today.

[wolfpld]

I have made a brief look at this and there's nothing obvious which would cause such behavior. The GetCallstack( lcv ) access should be only performed on indices that have corresponding callstack data stored. The lvc value of 3276800 is certainly interesting, 0x320000. Buffer overrun?

[TrianglesPCT]

Could the client shutting down before something is sent cause this?

It looks like lcv is the index into where the callstack for that zone entry is stored, perhaps it hadn't arrived when I shutdown?

Oh well probably not enough info here, want me to close this?

[wolfpld]

This is what I have specifically checked for. There does not seem to be a code path where an index is created with no backing data.