On Tue, 11 Sep 2018 16:26:40 +0530, Muni Sekhar said:

During kernel drivers testing I see lot of user mode applications blocks forever in interruptible sleep mode. Is there any way to get the corresponding kernel functions stack trace ?

cat /proc/NNN/stack should do the trick.

Similarly is it possible to get a warning or kernel functions stack trace when a task in “S - interruptible sleep mode” and did not get scheduled for certain duration?

Take a look at the number of processes in that state *normally* on a desktop system: [~] ps ax | grep S | wc -l 218 And that's running e16 as a window manager, not a full Gnome environment. That's the *normal* state for a process or kernel thread waiting for work.