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subversion-1.11.1-1+libserf1_0-1.3.9-1: Segfault after failed connect + empty serf debug package

Subversion segfaults with null instruction pointer after a failed connect. This affects the http and https protocols but not the svn protocol.
Related report:


$ uname -srvmo
CYGWIN_NT-10.0 3.1.2(0.340/5/3) 2019-12-21 15:25 x86_64 Cygwin

$ cygcheck -f /bin/svn

$ cygcheck -f /bin/cygserf-1-0.dll

$ svn info
Segmentation fault (core dumped)

$ svn info
Segmentation fault (core dumped)

$ svn info svn://
svn: E170013: Unable to connect to a repository at URL 'svn://'
svn: E000111: Can't connect to host '': Connection refused

Stacktrace from gdb:

#0  0x0000000000000000 in ?? ()
#1 0x00000003ce7c2c87 in serf.process_connection () from /usr/bin/cygserf-1-0.dll #2 0x00000003ce7c1333 in serf_event_trigger () from /usr/bin/cygserf-1-0.dll
#3  0x00000003ce7c141c in serf_context_run () from /usr/bin/cygserf-1-0.dll
#4 0x00000003ce0e7a11 in svn_ra_serf__context_run (sess=0x8000c2fb8, waittime_left=0xffffbef0, scratch_pool=0x8000d7e38) at /usr/src/debug/subversion-1.11.1-1/subversion/libsvn_ra_serf/util.c:913

Is possibly some error handling function pointer not set properly?

Same problem applies to cygwin x86 version. Downgrading to cygwin-3.0.7-1, libserf1_0-1.3.8-1 and subversion-1.10.4-1 does not help.

There is no easy way for further debugging. A serf-debuginfo package exists, but its tarball is empty...

PS: On the mirrors, there is still a serf-1.2.1-1-src.tar.bz2 with a (nonempty!) serf-debuginfo-1.2.1-1.tar.bz2 but the corresponding binary package libserf1_0-1.2.1-1.tar.xz is missing.

Problem reports:
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