Hi folks,
I am using go1.19.1 for development and see a strange panic ("invalid
memory address") in an application; the panic is definitely not
triggered by a nil dereference (the object in question is a string):
key = peer.Key()
entry, ok := tbl.recs[key]
The panic happens in the second line of the code. After checking that
'tbl' and 'tbl.recs' are valid (not nil), I inserted a log line in between:
key = peer.Key()
log.Printf("Key=%v", key)
entry, ok := tbl.recs[key]
Now the panic happens in the log line; the object 'key' seems to have an
invalid address (but I don't know how I can check if I can't access the
object and printf, where the new panic happens, obviously doesn't know
either).
The 'Key()' function returns a string (there is no way to return nil
from a function with a string return value that I know of), so obviously
something strange is going on.
It even got a bit stranger when I removed the log line and tried a recover:
defer func() {
if r := recover(); r != nil {
log.Printf("key=%s", peer.Key())
log.Printf("key=%v", key)
}
}()
The first log line (now) works (it delivers a valid string result), but
the second line still panics within recovery.
Maybe I should mention that the application heavily uses channels and go
routines; I have the subjective impression that the more go routines are
running the more likely the panic occurs after some time. But maybe that
is irrelevant.
I compiled the same source with go1.18 (the earliest version that could
compile the code), and the panic still occurs.
Is there anthing I can do to hunt down the problem? I am happy to share
the code (it is free software anyway) and can explain how to reproduce
the panic on your own machine (I guess that running the application
might requires some explanation).
Cheers, Bernd.
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