Re: [Crash-utility] [PATCH] Fix "vm -M" option to properly display virtual memory data of the task

Hi, Kazu Thank you for the comment. On Fri, Mar 17, 2023 at 9:02 AM HAGIO KAZUHITO(萩尾　一仁) <k-hagio-ab(a)nec.com <mailto:k-hagio-ab@nec.com>> wrote: Hi Lianbo, On 2023/03/15 18:07, Lianbo Jiang wrote: > The help/man page of the "vm" command suggests that the "-M" option > accepts the mm_struct address as a valid argument. However, the "vm > -M" option always prints the virtual memory data of the current > task, regardless of its arguments. I think that it's the intended behavior, isn't it?           -M mm  if the mm_struct address has been removed from the task_struct                  of an exiting task, the virtual memory data cannot be displayed.                  However, if the address can be determined from the kernel stack,                  it can be entered manually in order to try to resurrect the                  virtual memory data of the task. They are not the same issues. For the live debugging, take the sshd as an example: Without the patch: crash> ps |grep sshd      1159       1   3  ffff9915858a9980  IN   0.1    15820     9020  sshd 51573    1159   2  ffff991572868000  IN   0.1    18916    11168  sshd     51595   51573   2  ffff991575026600  IN   0.0    18784     6892  sshd crash> vm -M ffff991572868000 PID: 51727    TASK: ffff9914465cb300  CPU: 0    COMMAND: "crash"   <------not a correct result