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test 3207 fails the thread sanitizier for no-verbose builds in Curl_llist_insert_next #18806

@vszakats

Description

@vszakats

I did this

Disabled verbose strings in the tsan CI job:

--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -277,7 +278,7 @@ jobs:
             CFLAGS: -fsanitize=thread -g
             LDFLAGS: -fsanitize=thread
             CC: clang
-            generate: -DOPENSSL_ROOT_DIR=/home/runner/openssl -DENABLE_DEBUG=ON -DENABLE_CURLDEBUG=OFF
+            generate: -DOPENSSL_ROOT_DIR=/home/runner/openssl -DENABLE_DEBUG=ON -DENABLE_CURLDEBUG=OFF -DCURL_DISABLE_VERBOSE_STRINGS=ON
 
           - name: 'memory-sanitizer'
             install_packages: clang

These errors happened:
tsan-report-t3207.log
Ref: https://github.com/curl/curl/actions/runs/18178272234/job/51748891918?pr=18797

Ref: #18797 (comment)
Ref: #18804 (comment)

I expected the following

The job to pass tests.

curl/libcurl version

latest master

operating system

Linux (possibly agnostic)

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