diff --git a/blacklist.conf b/blacklist.conf
index 9a1a8ab..91b19eb 100644
--- a/blacklist.conf
+++ b/blacklist.conf
@@ -565,6 +565,7 @@ c3fee60908db4a8594f2e4a2131998384b8fa006 # printk: cosmetic; anyway, it fixes a 
 b665eae7a788c5e2bc10f9ac3c0137aa0ad1fc97 # printk: cosmetic problem
 d2130e82e9454304e9b91ba9da551b5989af8c27 # printk: cosmetic problem; wrong value shown in log
 57116ce17b04fde2fe30f0859df69d8dbe5809f6 # printk/workqueue: very hard to hit; works well with lockless ringuffer; but it might cause wrong timestamps or even lost messages on 4.12 where per-CPU buffers are used
+900fdc4573766dd43b847b4f54bd4a1ee2bc7360 # vsprintf: non-trivial change that modifies the behavior a bit; it should be safe because it is in the mainline for a long time without regression reports; but who knows; it is rather a corner case; it does not look worth the risk
 075e1a0c50f59ea210561d0d0fedbd945615df78 # sysrq: prehistoric bug, non-critical, found by code review
 b642e44e8ab335868b549fe5753b783ca47bf3a3 # kstrto*: comment fix
 ef0f2685336bbc334e8b6997ce9b155e5f7edd31 # kstrto*: comment fix