Most recent kernel where this bug did not occur: Distribution: Hardware Environment: Software Environment: Problem Description: The "memory leak" bug. The Linux kernel ACPI interpreter after completion the AML Continue operation doesn't release some memory allocations. The issue has been revealed by PMEMCV, is not seen by OAS (see bug 5422). Steps to reproduce: Run interpreter with the .asl demo code attached below to observe the slowing down of interpretation visually.
Created attachment 6288 [details] ASL code to reproduce bug. The attached AML test being run on the Linux kernel ACPI interpreter when it is compiled into a simulator allows to observe the problem. Each time when the Continue operator is executed new memory leaks are produced. To make the problem visual the demo runs this operation in a long enough cycle (0xA000 repetitions). So that you even can observe the slowing down of interpretation visually. INTERNAL BUG NUMBER 159
This bug and 5423 one contain the common part, so should be fixed simultaneously. About patch fixing this bug see 5423. After fixing bugs 5422, 5423 and 5424 the time of execution of all the tests of ASLTS test suite has been decreased in average like follow: Linux 2.6.5-7.191-smp #1 SMP Tue Jun 28 14:58:56 UTC 2005 i686 i686 i386 GNU/Linux -> from 76 minutes to 42 minutes. CYGWIN_NT-5.1 1.5.18(0.132/4/2) 2005-07-02 20:30 i686 unknown unknown Cygwin -> from 62 minutes to 58 minutes. The patch essentially decreases the time of execution of programs like given by demo. A. Time of execution of demo program BEFORE update: CYGWIN_NT-5.1 1.5.18(0.132/4/2) 2005-07-02 20:30 i686 unknown unknown Cygwin 9 minutes 12 seconds (+ noise of swapping) Linux 2.6.5-7.191-smp #1 SMP Tue Jun 28 14:58:56 UTC 2005 i686 i686 i386 GNU/Linux 5 minutes 53 seconds (+ noise of swapping) B. Time of execution of demo program AFTER update: CYGWIN_NT-5.1 1.5.18(0.132/4/2) 2005-07-02 20:30 i686 unknown unknown Cygwin 16 seconds (NO noise of swapping) Linux 2.6.5-7.191-smp #1 SMP Tue Jun 28 14:58:56 UTC 2005 i686 i686 i386 GNU/Linux 16 seconds (NO noise of swapping) The update was tested by the ASLTS test suite runs (all the test cases) on the following systems: - CYGWIN_NT-5.1 1.5.18(0.132/4/2) 2005-07-02 20:30 i686 unknown unknown Cygwin - Linux 2.6.5-7.191-smp #1 SMP Tue Jun 28 14:58:56 UTC 2005 i686 i686 i386 GNU/Linux for the following (all) modes supported by the ASLTS test suite: - 32-bit norm mode - 64-bit norm mode - 32-bit slack mode - 32-bit slack mode The tests were run (on the systems described above) before update, then the tests were run on those systems after update. Then results of two runs were compared. All is Ok (no new errors).
Integrated for next release of ACPICA
Released in ACPICA version 20051216
ACPICA 20060127 shipped in Linux-2.6.16 closed.