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There was a typo here: (gpointer *) pid_data should have been (gpointer *) &pid_data, so that g_hash_table_iter_next() would make pid_data a pointer to a PidData struct. Instead, the previous implementation left pid_data set to NULL, leading to a NULL dereference and segmentation fault whenever a name fell off the bus while a watched client existed. Instead of directly inserting the missing "&", I've used a pattern that avoids needing the cast, in an attempt to make it more obviously correct. Signed-off-by: Simon McVittie <smcv@collabora.com> Closes: #2417 Approved by: matthiasclasen