JDK-8331575 : C2: crash when ConvL2I is split thru phi at LongCountedLoop
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 17,21,22,23
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2024-05-02
  • Updated: 2024-06-14
  • Resolved: 2024-05-16
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JDK 21 JDK 23
21.0.5-oracleFixed 23 b24Fixed
Related Reports
Duplicate :  
JDK-8298851 - C2: ConvL2I nodes should not be split through phis
Relates :  
JDK-6663854 - assert(n != __null,"Bad immediate dominator info.") in C2 with -Xcomp
Relates :  
JDK-8256655 - rework long counted loop handling
Relates :  
JDK-6659207 - access violation in CompilerThread0
Description
Attached test case crashes with:

#  SIGFPE (0x8) at pc=0x00007f903c54e3d0, pid=3372325, tid=3372344
#
# JRE version: OpenJDK Runtime Environment (23.0) (fastdebug build 23-internal-adhoc.roland.jdk-jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 23-internal-adhoc.roland.jdk-jdk, mixed mode, sharing, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# J 41 c2 TestLongCountedLoopConvL2I.test1(I)I (61 bytes) @ 0x00007f903c54e3d0 [0x00007f903c54e360+0x0000000000000070]

Likely exists since LongCountedLoop exists.
Comments
[jdk21u-fix-request] Approval Request from Martin Should get backported for parity with 21.0.5-oracle. Applies cleanly and tier 1-4 have passed.
14-06-2024
A pull request was submitted for review. URL: https://git.openjdk.org/jdk21u-dev/pull/719 Date: 2024-06-13 15:31:23 +0000
13-06-2024
Changeset: f398cd22 Author: Roland Westrelin <roland@openjdk.org> Date: 2024-05-16 08:55:03 +0000 URL: https://git.openjdk.org/jdk/commit/f398cd225012694a586e528936159b6df7b1586c
16-05-2024
ILW = Same as JDK-8298851 = P3
03-05-2024
Ok seems like you've just sent a PR out in this very second. Then I suggest to close the other one as dup. Maybe you want to add the tests from JDK-8298851 as additional regression tests.
03-05-2024
Seems like a duplicate of JDK-8298851. I've had a patch ready for quite some time but never gotten to it. Do you want to take this over [~roland]?
03-05-2024
A pull request was submitted for review. URL: https://git.openjdk.org/jdk/pull/19086 Date: 2024-05-03 12:33:43 +0000
03-05-2024