806092 - Deadlock during shutdown (restart) at ShutdownEventTracing | PR_JoinThread

Status: RESOLVED INCOMPLETE

(Core :: Gecko Profiler, defect)

Description

[Honza Bambas (:mayhemer)]

nspr4.dll!_PR_MD_WAIT_CV(_MDCVar * cv, _MDLock * lock, unsigned int timeout)  Line 250	C
 	nspr4.dll!_PR_WaitCondVar()  Line 173	C
 	nspr4.dll!PR_JoinThread(PRThread * thread)  Line 1531 + 0x2a bytes	C
 	xul.dll!mozilla::ShutdownEventTracing()  Line 196 + 0x7 bytes	C++
 	xul.dll!XRE_main(int argc, char * * argv, const nsXREAppData * aAppData, unsigned int aFlags)  Line 3941 + 0xd bytes	C++
 	firefox.exe!wmain(int argc, wchar_t * * argv)  Line 105 + 0x57f bytes	C++
 	firefox.exe!__tmainCRTStartup()  Line 552 + 0x17 bytes	C
 	kernel32.dll!_BaseProcessStart@4()  + 0x23 bytes	

I unfortunately didn't check what the tracer thread was doing :( sorry...  Now I cannot reproduce.


STR, but cannot reproduce:
- have a default profile I normally use
- run it with Nightly and the profile extension installed and enabled
- since I was experiencing bug 805817 regularly on almost any page, I decided to switch using Aurora for a moment
- Aurora did start, checked for addons compatibility and then after the main window appeared it deadlocked (a different bug I will file separately), so I wanted to switch back to Nightly
- before I ran Nightly on that profile, I moved the profiler extension out of the extension dir in the default profile (to uninstall it)
- I started Nightly but it deadlocked even before it did the addons compatibility check
- in a debugger I found out it was joing the tracer thread but the thread didn't want to shutdown from some reason (I didn't check why... sorry)
- so, I made Nightly work again by starting it in a debugger and jumping over the PR_JoinThread call line ; no other way didn't help like switching profiler prefs or moving with the extension xpi file here and there
- since then it works again

I will try to reproduce, but I don't think I will be successful.  However, reporting to let you know there is such a potential critical problem.

Comment 1

[Honza Bambas (:mayhemer)]

BTW: to bypass the deadlock, I jumped over PR_JoinThread in the debugger.  Since that moment, I'm not able to reproduce.

Comment 2

[Rares Doghi, Desktop QA]

Hi Honza, Since this issue only occured 9 years ago, should we close this issue ? or are you able to reproduce it with our latest builds ? is the extension still available ? is there a way to reproduce this issue with Windows 10 ?

Comment 3

[Clara Guerrero ( Need Info Brindusa Tot Please)]

Hi,

I'm marking this as Resolved-Incomplete due to lack of response. If the issue is still reproducible with the latest Firefox version, feel free to reopen the bug with more information.

Regards, Clara.