[...]
>> [ NOTE-2: The call-trace I have seen once (TERMSLASH=0). ]
>
> Do you know for which operation?
>

# echo $TESTS
open-plain.test open-trunc.test open-creat.test open-creat-trunc.test
open-creat-excl.test open-creat-excl-trunc.test noent-plain.test
noent-trunc.test noent-creat.test noent-creat-trunc.test
noent-creat-excl.test noent-creat-excl-trunc.test sym1-plain.test
sym1-trunc.test sym1-creat.test sym1-creat-excl.test sym2-plain.test
sym2-trunc.test sym2-creat.test sym2-creat-excl.test symx-plain.test
symx-trunc.test symx-creat.test symx-creat-excl.test
symx-creat-trunc.test truncate.test dir-open.test dir-weird-open.test
dir-open-dir.test dir-weird-open-dir.test dir-sym1-open.test
dir-sym1-weird-open.test dir-sym2-open.test dir-sym2-weird-open.test
readlink.test impermissible.test

# for i in $TESTS ; do echo [ $i ] ; LC_ALL=C TEST_OVERLAYFS=1
TERMSLASH=1 ./run.sh $i 2>&1 | tee ../run-sh-log_${i}.txt ; dmesg
>dmesg_${i}.txt ; done

# for i in $TESTS ; do echo [ $i ] ; grep "INFO: possible recursive
locking detected" dmesg_${i}.txt ; done
...
[ symx-creat-trunc.test ]
[ truncate.test ]
[ 1910.007203] [ INFO: possible recursive locking detected ]
...

LAST-GOOD: dmesg_symx-creat-trunc.test.txt

FIRST-BAD: dmesg_truncate.test.txt

dmesg files attached.

- Sedat -