1415898 - 100% CPU usage calling mozilla::net::nsSocketTransportService::DoPollIteration in a loop while the browser was idle

Status: RESOLVED DUPLICATE of bug 1415387

(Core :: Networking, defect)

Description

[Markus Stange [:mstange]]

Attachment: Instruments trace

For the past 10 minutes, my Nightly has been at 100% CPU usage. Profiling with instruments showed that all the CPU usage was happening on the Socket Thread, with almost all the time spent in PR_Poll.

So it looks like PR_Poll was called repeatedly.

After opening this bug report page, the CPU usage has gone down again.

My open tabs are: GMail, Google Calendar, auth.mozilla.auth0.com x 2, IRCCloud, Bugzilla x 2, treeherder

Excerpt from an Activity Monitor sample:

    > 2408 Thread_2893937: Socket Thread
    > + 2408 thread_start  (in libsystem_pthread.dylib) + 13  [0x7fff983e408d]
    > +   2408 _pthread_start  (in libsystem_pthread.dylib) + 286  [0x7fff983e4887]
    > +     2408 _pthread_body  (in libsystem_pthread.dylib) + 180  [0x7fff983e493b]
    > +       2408 _pt_root  (in libnss3.dylib) + 211  [0x102033ba3]
    > +         2408 nsThread::ThreadFunc(void*)  (in XUL) + 475  [0x1022deb3b]
    > +           2408 MessageLoop::Run()  (in XUL) + 73  [0x10271a519]
    > +             2408 mozilla::ipc::MessagePumpForNonMainThreads::Run(base::MessagePump::Delegate*)  (in XUL) + 250  [0x102750fba]
    > +               2408 NS_ProcessNextEvent(nsIThread*, bool)  (in XUL) + 47  [0x1022e9a1f]
    > +                 2408 nsThread::ProcessNextEvent(bool, bool*)  (in XUL) + 1651  [0x1022e07e3]
    > +                   2408 non-virtual thunk to mozilla::net::nsSocketTransportService::Run()  (in XUL) + 13  [0x102393dcd]
    > +                     2342 mozilla::net::nsSocketTransportService::Run()  (in XUL) + 624  [0x1023930f0]
    > +                     ! 2269 mozilla::net::nsSocketTransportService::DoPollIteration(mozilla::BaseTimeDuration<mozilla::TimeDurationValueCalculator>*)  (in XUL) + 745  [0x102393879]
    > +                     ! : 2240 mozilla::net::nsSocketTransportService::Poll(unsigned int*, mozilla::BaseTimeDuration<mozilla::TimeDurationValueCalculator>*)  (in XUL) + 271  [0x102391f0f]
    > +                     ! : | 1692 PR_Poll  (in libnss3.dylib) + 1300  [0x10202d6d4]
    > +                     ! : | + 1670 poll  (in libnss3.dylib) + 457  [0x10201b6c9]
    > +                     ! : | + ! 1669 __select  (in libsystem_kernel.dylib) + 10  [0x7fff982f9eb6]

Comment 1

[Markus Stange [:mstange]]

This a nightly from yesterday, built from https://hg.mozilla.org/mozilla-central/rev/c10cf7082a9b84839e7c3fdda80bd468e091739a

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

[Tracking Requested - why for this release]:
Sounds like rather horrible thing to happen.

Comment 3

[Dragana Damjanovic [:dragana]]

This sounds like bug 1415387. The cause of that bug has already been backed out (bug 1415387 comment 6).

Comment 5

[Gerry Chang [:gchang]]

Track 58+ in bug 1415387 not here.