sysrq shows impossible call stack

[Eli Cohen]

Hi,
I am exsperiencing a hang, probably caused by a deadlock, so I can do 
sysrq commands. However I can see that in some cases the exspected call 
stack has some functions in between as if two call stack are 
interleaved. For example, if A and B denote two possible paths, I may see:
A0
A1
B0
A2
B1

Does anyone can explain that?
thanks
Eli
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