Re: sysrq shows impossible call stack

From: Roland Dreier
Date: Tue Apr 20 2004 - 11:31:36 EST

Eli> Hi, I am exsperiencing a hang, probably caused by a deadlock,
Eli> so I can do sysrq commands. However I can see that in some
Eli> cases the exspected call stack has some functions in between
Eli> as if two call stack are interleaved.

Hi Eli,

I think what you are seeing is old values left on the stack. If a
function allocates space for local variables but bumping the stack
pointer, but then never actually uses those variables, then old values
including old return addresses may be left in the stack.

- Roland
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