sorry， the v8 version is 7.5
and I found that immovable code was allocated in large object space. but
the crash was still Incomprehensible.
On Wednesday, August 11, 2021 at 11:32:20 AM UTC+8 孙志朋 wrote:
> v8 version :7.2
>
> I have add some checks in Heap::CollectGarbage,
> code snippet:
> -----------------------------------------
> OptionalTimedHistogramScope histogram_timer_priority_scope(
> gc_type_priority_timer, isolate_, mode);
>
> VerifyPointersVisitor no_dirty_regions_visitor0(this); // new added0
> code_space_->Verify(isolate(), &no_dirty_regions_visitor0); // new
> added1
>
> code_lo_space_->Verify(isolate()); // new added2
> next_gc_likely_to_collect_more =
> PerformGarbageCollection(collector, gc_callback_flags);
> if (collector == MARK_COMPACTOR || collector == SCAVENGER) {
> tracer()->RecordGCPhasesHistograms(gc_type_timer);
> }
> VerifyPointersVisitor no_dirty_regions_visitor1(this); // new
> added3
> code_space_->Verify(isolate(), &no_dirty_regions_visitor1);// new
> added4
>
> code_lo_space_->Verify(isolate());// new added5
>
> -----------------------------------------
>
>
> with this change, my application may crash at "new added5".
> crash reason : the code object's have wrong embeded object.
> code object print:
> -------------------------
> 2 0x9f302001: [Code]
> 3 - map: 0xac100551 <Map>
> 4 kind = STUB
> 5 compiler = unknown
> 6 address = 0x9eebbf80
> 7
> 8 Instructions (size = 1272)
> 9 0x9f302040 0 e30ec5ec movw ip, #58860 ;;
> object: ì
> 10
> 11 ;;
> object: ì
> 12
> 13 ;;
> object: ì
> 14
> 15 0x9f302044 4 e34ac94a movt ip, #43338 ;; wasm
> stub call
> -------------------------
> and what's the most strange thing was we never allocate an large code
> object.
> why the code_lo_space_'s verify can cause an error ?
>
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