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Description of problem:
The "task_cwd_path" tapset function can result in a memory leak. The function calls get_task_struct(task) early on, but does not have a corresponding put_task_struct() if the task->fs member is present.
Version-Release number of selected component (if applicable):
systemtap-3.0-7.el7.x86_64
How reproducible:
Easily
Steps to Reproduce:
1. Install systemtap required packages
2. Run the following script for a short interval
$ stap -e 'probe kprocess.exit {path=fullpath_struct_path(task_cwd_path(task_current()));printf("%s\n", path)}'
3. Monitor the "KernelStack" field in /proc/meminfo over time
Actual results:
The "KernelStack" counter continually increases
Expected results:
The "KernelStack" counter increases and decreases as task_structs are created/freed.
Additional info:
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:2301
Description of problem: The "task_cwd_path" tapset function can result in a memory leak. The function calls get_task_struct(task) early on, but does not have a corresponding put_task_struct() if the task->fs member is present. Version-Release number of selected component (if applicable): systemtap-3.0-7.el7.x86_64 How reproducible: Easily Steps to Reproduce: 1. Install systemtap required packages 2. Run the following script for a short interval $ stap -e 'probe kprocess.exit {path=fullpath_struct_path(task_cwd_path(task_current()));printf("%s\n", path)}' 3. Monitor the "KernelStack" field in /proc/meminfo over time Actual results: The "KernelStack" counter continually increases Expected results: The "KernelStack" counter increases and decreases as task_structs are created/freed. Additional info: