diff --git a/include/haproxy/tinfo-t.h b/include/haproxy/tinfo-t.h
index 9e0b950e1..e7f0c9e4b 100644
--- a/include/haproxy/tinfo-t.h
+++ b/include/haproxy/tinfo-t.h
@@ -79,6 +79,7 @@ enum {
 enum thread_exec_ctx_type {
 	TH_EX_CTX_NONE = 0,                 /* context not filled */
 	TH_EX_CTX_OTHER,                    /* context only known by a generic pointer */
+	TH_EX_CTX_INITCALL,                 /* the pointer is an initcall providing file:line */
 };
 
 struct thread_exec_ctx {
@@ -86,6 +87,7 @@ struct thread_exec_ctx {
 	/* 32-bit hole here on 64-bit platforms */
 	union {
 		const void *pointer;        /* generic pointer (for other) */
+		const struct initcall *initcall;  /* used with TH_EX_CTX_INITCALL */
 	};
 };
 
diff --git a/src/tools.c b/src/tools.c
index f6e1d273b..97532e2d7 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -7515,6 +7515,13 @@ void chunk_append_thread_ctx(struct buffer *output, const struct thread_exec_ctx
 	chunk_appendf(output,"%s", pfx ? pfx : "");
 
 	switch (ctx->type) {
+	case TH_EX_CTX_INITCALL: {
+		const char *file = ctx->initcall->loc_file;
+		const char *slash = strrchr(file, '/');
+		slash = slash ? slash + 1 : file;
+		chunk_appendf(output,"ctx registered at %s:%d", slash, ctx->initcall->loc_line);
+		break;
+	}
 	default:
 		chunk_appendf(output,"other ctx %p", ctx->pointer);
 		break;