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I first tried HEAD with http.tlsreuse off. Sadly, I get this trace, leading to a segfault:

#0  __GI___libc_free (mem=0x301) at malloc.c:2941
#1  0x00007f62b815a80d in CRYPTO_free () from /lib64/libcrypto.so.10
#2  0x00007f62b824451d in ASN1_STRING_free () from /lib64/libcrypto.so.10
#3  0x00007f62b82385fd in ASN1_primitive_free () from /lib64/libcrypto.so.10
#4  0x00007f62b82385df in ASN1_primitive_free () from /lib64/libcrypto.so.10
#5  0x00007f62b823897f in ASN1_template_free () from /lib64/libcrypto.so.10
#6  0x00007f62b823880a in asn1_item_combine_free () from /lib64/libcrypto.so.10
#7  0x00007f62b823897f in ASN1_template_free () from /lib64/libcrypto.so.10
#8  0x00007f62b823880a in asn1_item_combine_free () from /lib64/libcrypto.so.10
#9  0x00007f62b82388c5 in ASN1_item_free () from /lib64/libcrypto.so.10
#10 0x00007f62b859cdf8 in SSL_SESSION_free () from /lib64/libssl.so.10
#11 0x00007f62b8599d0d in SSL_free () from /lib64/libssl.so.10
#12 0x00007f62b3a0866e in XrdHttpProtocol::Cleanup (this=this@entry=0x7f62a400d8e0) at /usr/src/debug/xrootd/xrootd/src/XrdHttp/XrdHttpProtocol.cc:1687
#13 0x00007f62b3a0891e in XrdHttpProtocol::Recycle (this=0x7f62a400d8e0, lp=<optimized out>, csec=<optimized out>, reason=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdHttp/XrdHttpProtocol.cc:865
#14 0x00007f62b9d03ec9 in XrdXrootdTransit::Recycle (this=0x7f62a40274d0, lp=0x7f62a4006af8, consec=0, reason=0x7f62a40249e0 "send failure") at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdTransit.cc:424
#15 0x00007f62b9a6828e in XrdLinkXeq::Close (this=0x7f62a4006af8, defer=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdLinkXeq.cc:240
#16 0x00007f62b9a64eb9 in XrdLink::setProtocol (this=0x7f62a4006af8, pp=<optimized out>, runit=<optimized out>, push=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdLink.cc:421
#17 0x00007f62b9a6b7bf in XrdScheduler::Run (this=0x614c20 <XrdGlobal::Sched>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:382
#18 0x00007f62b9a6b909 in XrdStartWorking (carg=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:88
#19 0x00007f62b9a2eae7 in XrdSysThread_Xeq (myargs=0x15c36e0) at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.cc:86
#20 0x00007f62b95d3ea5 in start_thread (arg=0x7f62b48b9700) at pthread_create.c:307
#21 0x00007f62b88ca8dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

So it seems OpenSSL tries to clean up the session even if caching is disabled... (?).

I'll try with http.tlsreuse on next.

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