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I don't know if it's useful, but I ran this through strace and found the following:
[pid 3139] epoll_wait(149, {{EPOLLIN, {u32=3628045120, u64=140350274376512}}}, 1024, 4294967295) = 1
[pid 3139] read(168, "\0\0\0\0", 16) = 4
[pid 3139] read(168, 0x7fa5d8c741cc, 12) = -1 EAGAIN (Resource temporarily unavailable)
[pid 3139] read(168, "\0\1p$\0\0\0\0\200M\3363", 12) = 12
[pid 3139] gettimeofday({1398314925, 998294}, NULL) = 0
[pid 3139] write(2, "[2014-04-24 06:48:45 +0200][Dump"..., 151[2014-04-24 06:48:45 +0200][Dump ][XRootD ] [red-gridftp4.unl.edu:1094] ReadRawReadV: read buffer for chunk 611320064@3737509952915243008
) = 151
[pid 3139] gettimeofday({1398314925, 998443}, NULL) = 0
[pid 3139] epoll_wait(149, {{EPOLLIN, {u32=3628045120, u64=140350274376512}}}, 1024, 4294967295) = 1
[pid 3139] read(168, "\0\0\0\327\3\354\0\0\1TF\344\32J\0{", 16) = 16
[pid 3139] gettimeofday({1398314925, 998624}, NULL) = 0
[pid 3139] write(2, "[2014-04-24 06:48:45 +0200][Erro"..., 185[2014-04-24 06:48:45 +0200][Error ][XRootD ] [red-gridftp4.unl.edu:1094] ReadRawReadV: Impossible to find chunk buffer corresponding to 65798144 bytes at 95779437589168251.
All the cases where an invalid request was returned had the read of the header split across. The problem can't be that simple though - there were cases where the header was split but didn't run into an invalid argument error. That said, most of those cases look like this:
[pid 29963] read(161, "\0\0\0\0\0\1+!\0\0\0\0", 16) = 12
[pid 29963] read(161, 0x7fa36781b3d4, 4) = -1 EAGAIN (Resource temporarily unavailable)
[pid 29963] read(161, 0x7fa36781b3d4, 4) = -1 EAGAIN (Resource temporarily unavailable)
[pid 29963] gettimeofday({1398309237, 668923}, NULL) = 0
[pid 29963] epoll_wait(148, {{EPOLLIN, {u32=1823182080, u64=140339879578880}}}, 1024, 4294967295) = 1
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