csup crash

Dear colleagues,

I found csup is crashing on my building machine on some broken repo element, 
but cannot quickli realize what's the source of problem

Any hints?

Relevant info from gdb:

#0  stream_open_buf (b=0x0) at 
/usr/src/usr.bin/csup/../../contrib/csup/stream.c:364
364             b->in = 0;
[New Thread 800e0a900 (LWP 100725/csup)]
[New Thread 800e0aac0 (LWP 100686/csup)]
[New Thread 800e0ac80 (LWP 100548/csup)]
[New Thread 800e0ae40 (LWP 100535/csup)]
[New Thread 800e641c0 (LWP 100471/csup)]
[New Thread 800e64380 (LWP 100443/csup)]
[New Thread 800e041c0 (LWP 100446/initial thread)]
(gdb) bt
#0  stream_open_buf (b=0x0) at 
/usr/src/usr.bin/csup/../../contrib/csup/stream.c:364
#1  0x0000000000411787 in rcsfile_getdeltatext (rf=0x80111ec00, d=0x801121880, 
buf_dest=0x7fffff1f9b18)
    at /usr/src/usr.bin/csup/../../contrib/csup/rcsfile.c:677
#2  0x0000000000411715 in rcsfile_getdeltatext (rf=0x80111ec00, d=0x801121640, 
buf_dest=0x7fffff1f9c10)
    at /usr/src/usr.bin/csup/../../contrib/csup/rcsfile.c:658
#3  0x0000000000412174 in rcsfile_write (rf=0x80111ec00, dest=0x8011099c0)
    at /usr/src/usr.bin/csup/../../contrib/csup/rcsfile.c:579
#4  0x0000000000417d6c in updater_rcsedit (up=0x7fffff1f9f60, fup=0x801121d00, 
name=0x80111c402 "ports/graphics/Makefile,v",
    rcsopt=Variable "rcsopt" is not available.
) at /usr/src/usr.bin/csup/../../contrib/csup/updater.c:1688
#5  0x0000000000419a59 in updater_batch (up=0x7fffff1f9f60, isfixups=0) at 
/usr/src/usr.bin/csup/../../contrib/csup/updater.c:773
#6  0x000000000041a1d1 in updater (arg=Variable "arg" is not available.
) at /usr/src/usr.bin/csup/../../contrib/csup/updater.c:237
#7  0x00000000004158c4 in thread_start (data=Variable "data" is not available.
) at /usr/src/usr.bin/csup/../../contrib/csup/threads.c:169
#8  0x0000000800a224d1 in pthread_getprio () from /lib/libthr.so.3
#9  0x0000000000000000 in ?? ()
Cannot access memory at address 0x7fffff1fa000

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
------------------------------------------------------------------------
*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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