Public bug reported:
eventstat checks to see if a process is a kernel thread by checking
/proc/$pid/exe - however, sometimes processes die before we can open
/proc/$pid/exe and it defaults to assuming the exe was not found and
hence it was a kernel thread rather than that it was a normal userland
process.
Instead, it should open /proc/$pid and if does not exist, assume it was
a short lived process (which is more likely). If this opens OK, then it
should check if /proc/$pid/exe exists or not. To avoid TOUTOC (time
of check, time of use) races, use openat on /proc/pid
** Affects: eventstat (Ubuntu)
Importance: Medium
Assignee: Colin King (colin-king)
Status: In Progress
** Changed in: eventstat (Ubuntu)
Status: New => In Progress
** Changed in: eventstat (Ubuntu)
Importance: Undecided => Medium
** Changed in: eventstat (Ubuntu)
Assignee: (unassigned) => Colin King (colin-king)
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https://bugs.launchpad.net/bugs/1226787
Title:
eventstat: sometimes detection of a kernel thread is wrong
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