Date: Thu, 2 May 2013 09:52:26 -0500 From: Eric van Gyzen <eric@vangyzen.net> To: Richard Sharpe <realrichardsharpe@gmail.com> Cc: freebsd-net@freebsd.org, Alfred Perlstein <bright@mu.org> Subject: Re: Seeing EINVAL from writev on 8.0 to a non-blocking socket even though the data seems to hit the wire Message-ID: <51827DAA.2020009@vangyzen.net> In-Reply-To: <CACyXjPy8ctxs1vG0KPLHtaJxrM_YTs6XfLEbhQUBKTkZAjewzA@mail.gmail.com> References: <CACyXjPwojx1vBo-7bDmN=Pjc2Qp3mRd3Ek2FUjLR_4DC=aUnWA@mail.gmail.com> <5181ECDF.1040905@mu.org> <CACyXjPy8ctxs1vG0KPLHtaJxrM_YTs6XfLEbhQUBKTkZAjewzA@mail.gmail.com>
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On 05/02/2013 08:48, Richard Sharpe wrote: > On Wed, May 1, 2013 at 9:34 PM, Alfred Perlstein <bright@mu.org> wrote: >> On 5/1/13 8:03 PM, Richard Sharpe wrote: >>> Hi folks, >>> >>> I am checking to see if there are any known bugs with respect to this >>> in FreeBSD 8.0. >>> >>> Situation is that Samba 3.6.6 uses writev to a non-blocking socket to >>> get the SMB2 requests on the wire. >>> >>> Intermittently, we see the writev return EINVAL even though the data >>> has gotten on the wire. This I have verified by grabbing a capture and >>> comparing the SMB Sequence number in the last outgoing packet on the >>> wire vs the in-memory contents when we get EINVAL. >>> >>> Sometimes it occurs on a four-element IOVEC, sometimes we get EAGAIN >>> on the four-element IOVEC and then we get EINVAL when retrying on a >>> smaller IOVEC. >>> >>> Where should I look to check if there is some path where this might be >>> happening? Is this even the correct mailing list? >>> >> What does the iovec look like when you get EINVAL? Can you sanity check >> it? Is there anything special about it? (zero length vecs?) >> >> I think there are a few "maxvals" that if overrun cause EINVAL to be >> returned. example is if your iovec is somehow huge or has many, many >> elements. > Can anyone tell me the call graph down to the TCP code? > writev kern/sys_generic.c kern_writev dofilewrite fo_write in sys/file.h soo_write in kern/sys_socket.c sosend in kern/uipc_socket.c sosend_generic tcp_usr_send in netinet/tcp_usrreq.c Eric
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