726799 - "Assertion failure: !f.fp()->finishedInInterpreter()," with mjitChunkLimit

Status: VERIFIED FIXED

(Core :: JavaScript Engine, defect)

Description

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Attachment: stack

function tryItOut(code) {
    f = eval("(function(){" + code + "})")
    for (e in f()) {}
}
mjitChunkLimit(25)
tryItOut("\
    for each(x in[0,0,0,0,0,0,0]) {\
        function f(b) {\
            Object.defineProperty(b,\"\",({t:f}))\
        }\
        for each(d in[(1),String,String,String,String,(0),String,(1),String]) {\
            try{\
                f(d);\
                yield\
            }catch(e){}\
        }\
    }\
")

asserts js debug shell on m-c changeset ebafee0cea36 with -m and -n at Assertion failure: !f.fp()->finishedInInterpreter(),

Comment 1

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

autoBisect shows this is probably related to the following changeset:

The first bad revision is:
changeset:   84835:d0c192e5bd41
user:        Brian Hackett
date:        Wed Jan 18 16:40:18 2012 -0800
summary:     Compile large scripts in chunks, bug 706914. r=dvander

Comment 2

[Brian Hackett [Laid off!]]

Attachment: patch

With chunk compilation it is possible we could compile a portion of a generator script (previously, we relied on the presence of JSOP_GENERATOR or JSOP_YIELD to abort compilation).  s-s to be safe, generator frames behave pretty differently from normal frames and it's possible the VM could be confused in worse ways by this accidental compilation.

Comment 3

[Brian Hackett [Laid off!]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/aa8ab7f39600

Comment 4

[Ed Morley [:emorley]]

https://hg.mozilla.org/mozilla-central/rev/aa8ab7f39600

Comment 5

[Daniel Veditz [:dveditz]]

Comment on attachment 597590 [details] [diff] [review]
patch

[Approval Request Comment]
Regression caused by (bug #): 706914
User impact if declined: potentially exposed to a security hole for 6 wks
Testing completed (on m-c, etc.): 
Risk to taking this patch (and alternatives if risky): We'd compile code dangerously
String changes made by this patch: none

Comment 6

[Gary Kwong [:gkw] [:nth10sd] (NOT official MoCo now)]

Verified FIXED:

autoBisect shows this is probably related to the following changeset:

The first good revision is:
changeset:   87060:aa8ab7f39600
user:        Brian Hackett
date:        Thu Feb 16 15:26:30 2012 -0800
summary:     Ensure that generators are never compiled, bug 726799. r=dvander

Comment 7

[Alex Keybl [:akeybl]]

Comment on attachment 597590 [details] [diff] [review]
patch

[Triage Comment]
Approved for Beta 12 since this is an sg:crit and we'll have the opportunity to mitigate any fallout. Please land before EOD tomorrow (3/27).

Comment 8

[Brian Hackett [Laid off!]]

https://hg.mozilla.org/releases/mozilla-beta/rev/37ac63b43ce6

Comment 9

[Christian Holler (:decoder)]

Automatically extracted testcase for this bug was committed:

https://hg.mozilla.org/mozilla-central/rev/efaf8960a929