16640 - [DOGFOOD] hitting back after large page begins to load takes forever

Status: VERIFIED WORKSFORME

(Core :: Networking, defect, P3)

Description

[David Baron :dbaron: (⌚️UTC-5, no longer working on Mozilla)]

DESCRIPTION:
 If I hit the "back" button after the above URL begins to load, it takes about
10-15 seconds to show the previous page again.  During this time, my CPU monitor
shows about 100% CPU usage.


STEPS TO REPRODUCE:

 * Begin loading the page
 * Right after you see some of the page show up, hit back


ACTUAL RESULTS:
 * A gray screen for about 15 seconds, during which CPU usage is 100%
 * Then, the previous page.

EXPECTED RESULTS:
 * Just the page.

DOES NOT WORK CORRECTLY ON:
 * Linux, apprunner, 1999-10-16-08-M11

Comment 1

[Sean Richardson]

Also DOES NOT WORK CORRECTLY ON:
Windows NT 4.0sp3, mozilla.exe, 1999-10-17-08-M11

STEPS TO REPRODUCE:
Click on the URL above and otherwise follow dbaron's steps.

ACTUAL RESULTS:
Watch the status bar closely as soon as the [Back] button is clicked.
For a second or two, depending on the speed of your link,
the status bar will alternate between:
"Transferring data from bugzilla.mozilla.org" and
"Transferring data from lxr.mozilla.org" - until this bugzilla page that
you started from is fully reloaded. At that point the [STOP] button will
grey out, but the status bar will continue to show
"Transferring data from lxr.mozilla.org" for a considerable time,
and it is possible to verify that data is being received by the machine.

EXPECTED RESULTS:
After the [Back] button is clicked, for a second or two,
depending on the speed of your link, the status bar will show:
"Transferring data from bugzilla.mozilla.org" - until this bugzilla page that
you started from is fully reloaded. At that point the [STOP] button will
grey out. THAT's IT, NO MORE.

SPECULATION:
The page at lxr referenced by the URL above continues to load until it is
completely loaded rather than the load attempt aborting when the [Back]
button is clicked. Changing Component to "Necko" based on this speculation.

ADDITIONAL OBSERVATIONS:
Tried this with a few other pages in the hundreds of kilobyte size range.
Did not see same behaviour. On the other hand, I am all but certain that I
added a comment to an open bug reporting something very similar (downloaded
a packet sniffer to check on that one, wish I remembered the bug number).

Comment 2

[Sean Richardson]

Found it. Similar but different. Bug 11355. Look in the second paragraph under
"Additional Comments From [e-mail]  10/13/99 08:22"

Still the same behaviour noted then; nothing appears in the status bar other
than the "Document: Done" message, but network activity clearly continues.

Comment 3

[Warren Harris]

Dogfood or beta?

Comment 4

[Gagan]

depends... cache or slow layout (bug 11702) :) actually it may also be related
to a similar bug 16484 that I just assigned to rick which suggests that clicking
on a link on a big page (while it is loading) doesn't stop the current one.
cc'ing him as well.

Comment 5

[leger]

tever, we think this is fixed.  Can you try with latest build?

Comment 6

[Tom Everingham]

Works for me.  Tested on Linux and NT.  Build 1999110809

Comment 7

[leger]

Bulk move of all Necko (to be deleted component) bugs to new Networking

component.