Closed Bug 1242840 Opened 5 years ago Closed 5 years ago

Crash [@ JSObject::as<js::ClonedBlockObject>] with OOM


(Core :: JavaScript Engine, defect)

Not set



Tracking Status
firefox46 --- wontfix
firefox47 --- fixed


(Reporter: decoder, Assigned: jonco)


(Blocks 1 open bug)


(Keywords: assertion, regression, testcase, Whiteboard: [jsbugmon:update])

Crash Data


(1 file)

The following testcase crashes on mozilla-central revision c2256ee8ae9a (build with --enable-optimize --enable-posix-nspr-emulation --enable-valgrind --enable-gczeal --disable-tests --enable-debug, run with --fuzzing-safe --ion-offthread-compile=off --ion-eager):

oomTest(() => {
    try {
        for (quit of ArrayBuffer);
    } catch (e) {
        switch (1) {
            case 0:
                let x
            case 1:
                (function() x)()


Program received signal SIGSEGV, Segmentation fault.
JSObject::as<js::ClonedBlockObject> (this=0x0) at js/src/jsobj.h:546
#0  JSObject::as<js::ClonedBlockObject> (this=0x0) at js/src/jsobj.h:546
#1  0x0000000000ad627c in js::ScopeIter::settle (this=this@entry=0x7fffffffb3a0) at js/src/vm/ScopeObject.cpp:1473
#2  0x0000000000ad699e in js::ScopeIter::operator++ (this=this@entry=0x7fffffffb3a0) at js/src/vm/ScopeObject.cpp:1501
#3  0x0000000000a2e3fb in js::UnwindAllScopesInFrame (cx=cx@entry=0x7ffff6907800, si=...) at js/src/vm/Interpreter.cpp:994
#4  0x00000000007f188e in js::jit::DebugEpilogue (cx=cx@entry=0x7ffff6907800, frame=frame@entry=0x7fffffffbb08, pc=0x7ffff318e88c "\214", ok=ok@entry=false) at js/src/jit/VMFunctions.cpp:690
#5  0x00000000006dcbbc in js::jit::OnLeaveBaselineFrame (cx=cx@entry=0x7ffff6907800, frame=..., pc=<optimized out>, rfe=rfe@entry=0x7fffffffba98, frameOk=frameOk@entry=false) at js/src/jit/JitFrames.cpp:525
#6  0x0000000000701777 in HandleExceptionBaseline (pc=0x7ffff318e88c "\214", rfe=<optimized out>, frame=..., cx=0x7ffff6907800) at js/src/jit/JitFrames.cpp:758
#7  js::jit::HandleException (rfe=<optimized out>) at js/src/jit/JitFrames.cpp:899
#8  0x00007ffff7fe8608 in ?? ()
#9  0x0000000000000008 in ?? ()
#10 0x00007fffffffba98 in ?? ()
#11 0x0000000000000000 in ?? ()
rax	0x7ffff7e6a1c0	140737352475072
rbx	0x7fffffffb3a0	140737488335776
rcx	0x7ffff7e660a0	140737352458400
rdx	0x1	1
rsi	0x2	2
rdi	0x0	0
rbp	0x7fffffffb320	140737488335648
rsp	0x7fffffffb2f0	140737488335600
r8	0x7fffffffb390	140737488335760
r9	0xa	10
r10	0x1	1
r11	0x7ffff695d1e0	140737330401760
r12	0x7ffff7e6a1c0	140737352475072
r13	0x7ffff7e6a1c0	140737352475072
r14	0x7fffffffbb08	140737488337672
r15	0x7ffff318e88c	140737271883916
rip	0x7e45f1 <JSObject::as<js::ClonedBlockObject>()+1>
=> 0x7e45f1 <JSObject::as<js::ClonedBlockObject>()+1>:	mov    (%rdi),%rdx
   0x7e45f4 <JSObject::as<js::ClonedBlockObject>()+4>:	lea    0x13b5685(%rip),%rax        # 0x1b99c80 <_ZN2js17ClonedBlockObject6class_E>
Whiteboard: [jsbugmon:update,bisect] → [jsbugmon:update]
JSBugMon: Bisection requested, result:
=== Treeherder Build Bisection Results by autoBisect ===

The "good" changeset has the timestamp "20151013053056" and the hash "8d9c20c241be7d7b3cfa90a3368a77db42172781".
The "bad" changeset has the timestamp "20151013054956" and the hash "d80f9d6921f8209ef01aa730be9a97ab727704d1".

Likely regression window:
Not sure if this is exactly the same as bug 1241731, but both involve "clones", so setting s-s since that bug is s-s, and setting needinfo? from Jon as a start (since he's fixing that bug too).

(I was unable to reproduce this quickly on Mac builds fwiw)
Group: javascript-core-security
Flags: needinfo?(jcoppeard)
This bug is unrelated and the testcase doesn't fail without that assertion, even under valgrind.  Clearing s-s.
Assignee: nobody → jcoppeard
Group: javascript-core-security
Flags: needinfo?(jcoppeard)
Patch to change jit::Invalidate() to skip calling the profiler's markEvent() method if we hit OOM.  I'm pretty sure that this will not cause problems.

This let me make Invalidate() infallible, and a whole chain of other things followed.
Attachment #8712135 - Flags: review?(jdemooij)
Comment on attachment 8712135 [details] [diff] [review]

Review of attachment 8712135 [details] [diff] [review]:

Nice fix!
Attachment #8712135 - Flags: review?(jdemooij) → review+
Closed: 5 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla47
Too late to uplift to 46, we are just at the end of the cycle heading into beta 11.
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