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Hi,
In XRootD 5.5.0 we recently observed a number of core dumps on a few of our production hosts.
(The crashes occur at very similar times across a subset of the hosts).

xrootd[2076890]: segfault at 1010 ip 00007f3148c49d00 sp 00007f312abfac68 error 4 in libpthread-2.17.so[7f3148c40000+17000]

The only information I unfortunately have is:

#0  0x00007f3148c49d00 in pthread_mutex_lock () from /lib64/libpthread.so.0
No symbol table info available.
#1  0x00007f3149e11a92 in Lock (this=0x2dc) at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.hh:222
No locals.
#2  XrdXrootdProtocol::do_OffloadIO (this=0x4) at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdXeq.cc:1290
        pioP = <optimized out>
        rc = 0
#3  0x00007f3149e0b343 in XrdXrootdProtocol::Process (this=0x7f30dd16d400, lp=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/XrdXrootd/XrdXrootdProtocol.cc:373
        rc = <optimized out>
#4  0x00007f3149b4e3e6 in XrdLinkXeq::DoIt (this=0x7f309ba88c50) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdLinkXeq.cc:320
        rc = <optimized out>
#5  0x00007f3149b514ca in XrdScheduler::Run (this=0x614e60 <XrdGlobal::Sched>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:406
        waiting = 18
        jp = 0x7f309ba88c50
#6  0x00007f3149b515e9 in XrdStartWorking (carg=<optimized out>) at /usr/src/debug/xrootd/xrootd/src/Xrd/XrdScheduler.cc:89
        sp = <optimized out>
#7  0x00007f3149adf1e7 in XrdSysThread_Xeq (myargs=0x7f313140f0e0) at /usr/src/debug/xrootd/xrootd/src/XrdSys/XrdSysPthread.cc:86
        ap = 0x7f313140f0e0
        retc = <optimized out>
#8  0x00007f3148c47ea5 in start_thread () from /lib64/libpthread.so.0
No symbol table info available.
#9  0x00007f314897098d in clone () from /lib64/libc.so.6
No symbol table info available.

Any thoughts appreciated, in what might be happening, and if a particular mode of operation is triggering this particular flow ?

James

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