Fixes thread_cancel crash issue #14392
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Why I did it
fixes thread_cancel will lead to core dump, make thread pointer to NULL while deleting it.
How I did it
make pointer list and thr in
do_thread_cancel()to NULLHow to verify it
check list and thread_array is NULL
Which release branch to backport (provide reason below if selected)
Description for the changelog
make pointer list and thr in
do_thread_cancel()to NULLEnsure to add label/tag for the feature raised. example - PR#2174 under sonic-utilities repo. where, Generic Config and Update feature has been labelled as GCU.
Link to config_db schema for YANG module changes
N/A
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