Last Comment Bug 870007 - Assertion failure: pn, at ion/AsmJS.cpp:1159 or Crash [@ ~ModuleCompiler]
: Assertion failure: pn, at ion/AsmJS.cpp:1159 or Crash [@ ~ModuleCompiler]
: assertion, testcase
Product: Core
Classification: Components
Component: JavaScript Engine (show other bugs)
: Trunk
: x86 Linux
-- critical (vote)
: mozilla24
Assigned To: Benjamin Bouvier [:bbouvier]
: general
: Jason Orendorff [:jorendorff]
Depends on:
Blocks: langfuzz
  Show dependency treegraph
Reported: 2013-05-08 10:13 PDT by Christian Holler (:decoder)
Modified: 2013-08-23 07:39 PDT (History)
7 users (show)
ryanvm: in‑testsuite?
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---

[crash-signature] Machine-readable crash signature (1.00 KB, text/plain)
2013-05-08 10:15 PDT, Christian Holler (:decoder)
no flags Details
proposed fix (1.23 KB, patch)
2013-05-08 11:01 PDT, Benjamin Bouvier [:bbouvier]
luke: review+
Details | Diff | Splinter Review
proposed fix compatible with tip (1.21 KB, patch)
2013-05-08 13:33 PDT, Benjamin Bouvier [:bbouvier]
no flags Details | Diff | Splinter Review
[crash-signature] Machine-readable crash signature (945 bytes, text/plain)
2013-05-27 06:05 PDT, Christian Holler (:decoder)
no flags Details
Same fix with qref (1.27 KB, patch)
2013-05-27 19:22 PDT, Benjamin Bouvier [:bbouvier]
bbouvier: review+
bajaj.bhavana: approval‑mozilla‑aurora+
Details | Diff | Splinter Review

Description User image Christian Holler (:decoder) 2013-05-08 10:13:38 PDT
The following testcase asserts on mozilla-central revision 41ff3b67b692 (run with --ion-eager):

assertEq((function() {
  'use asm';
  function _main() {
    var $1=0, $2=0, $3=0, $4=0, $5=0, $6=0, $7=0, $8=0, $9=0, $10=0, label=0;
      switch (label | 0) {
       case 1:
       case (2147483647):
  return _main;
})()(), 1);
Comment 1 User image Christian Holler (:decoder) 2013-05-08 10:15:42 PDT
Created attachment 747014 [details]
[crash-signature] Machine-readable crash signature
Comment 2 User image Benjamin Bouvier [:bbouvier] 2013-05-08 11:01:16 PDT
Created attachment 747037 [details] [diff] [review]
proposed fix

This crash would happen as in CheckSwitchRange, if the switch table is larger than 512Mb, fail would be called with stmt, which is NULL here (end condition of the for loop above).
Comment 3 User image Luke Wagner [:luke] 2013-05-08 11:27:19 PDT
Comment on attachment 747037 [details] [diff] [review]
proposed fix

Nice, thanks!
Comment 4 User image Benjamin Bouvier [:bbouvier] 2013-05-08 13:33:47 PDT
Created attachment 747098 [details] [diff] [review]
proposed fix compatible with tip

Oops, forgot to pull tip before making the patch.
This version is compatible with tip.
Comment 5 User image Christian Holler (:decoder) 2013-05-27 06:05:15 PDT
Created attachment 754428 [details]
[crash-signature] Machine-readable crash signature
Comment 6 User image Benjamin Bouvier [:bbouvier] 2013-05-27 19:22:32 PDT
Created attachment 754629 [details] [diff] [review]
Same fix with qref

[Approval Request Comment]
Bug caused by (feature/regressing bug #): 870007
User impact if declined: low.
Risk to taking this patch (and alternatives if risky): no risk.

Same patch file as the one reviewed by Luke.
Comment 7 User image Ryan VanderMeulen [:RyanVM] 2013-05-29 17:40:11 PDT
Comment 8 User image Ryan VanderMeulen [:RyanVM] 2013-05-30 09:10:27 PDT
Comment 9 User image Ryan VanderMeulen [:RyanVM] 2013-06-03 06:11:29 PDT
Comment 10 User image Paul Silaghi, QA [:pauly] 2013-08-23 04:34:59 PDT
Running jsshell-win32 from a build before the fix with the testcase I got:
"Assertion failure: pn, at e:/builds/moz2_slave/m-cen-w32-d-000000000000000000/bu

After the fix (FF 24b5):
"test.js:6:7 warning: asm.js type error: all switch statements generate tables; t
his table would be too big
test.js:11:0 Error: Assertion failed: got (void 0), expected 1"

Is it ok ?
Comment 11 User image Christian Holler (:decoder) 2013-08-23 04:49:43 PDT
Yes, this is likely correct :)
Comment 12 User image Paul Silaghi, QA [:pauly] 2013-08-23 04:55:55 PDT
Thanks Christian. Verified based on comment 11
Comment 13 User image Paul Silaghi, QA [:pauly] 2013-08-23 07:39:26 PDT
Off-topic: Why do I get on Linux "No such file or directory" error when trying to run ./js from ?

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