Re: malloc(M_WAITOK) of "Mbuf", forcing M_NOWAIT with the following non-sleepable locks held

On Mon, 5 Jul 2004, Willem Jan Withagen wrote:

> It's not a LOR, but almost looks like one....  it could also be
> harmless, since it only delays the server (because it is logging to a
> serial console???) 

Do you have a stack trace available for this?  I've cleaned up a few, but
not all, of the known M_WAITOK with a mutex held cases, but there may well
be more.  I know Bruce Simpson has also been working on at least one.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> >From what I find in the archives, has this to do with MBUMA???
> Although no one has something with uipc_socket
> 
> I'm trying to tar something from an NFS mounted file, into that same NFS mounted
> directory... Copying the source first to /tmp, and then untar works flawless. So
> I guess it has to do with the way tar reads the inputfile.
> 
> [~/src/ports/net-snmp] wjw_at_opteron> uname -a
> FreeBSD opteron.digiware.nl 5.2-CURRENT FreeBSD 5.2-CURRENT #48: Fri Jul 2
> 00:55:22 CEST 2004 root_at_opteron.digiware.nl:/usr/obj/home2/src/sys/OPTERON.amd64
> amd64
> 
> Mount options:
>     rw,-Tbis3,nodev,intr,-r=1638,-w=163844
> 
> Which could be the reason, sinc I now see they are rather strange. :(
> So perhaps a don't do that is appropriate...., but none the less
> here's the traceback. (it's on amd64, hence no parameters)
> 
> --WjW
> 
> ----------------
> malloc(M_WAITOK) of "Mbuf", forcing M_NOWAIT with the following non-sleepable
> locks held:
> exclusive sleep mutex so_rcv r = 0 (0xffffff006174a6f8) locked _at_ /home2/src/sys/
> kern/uipc_socket.c:917
> Stack backtrace:
> backtrace() at backtrace+0x17
> witness_warn() at witness_warn+0x297
> uma_zalloc_arg() at uma_zalloc_arg+0x59
> m_copym() at m_copym+0x118
> soreceive() at soreceive+0x9a4
> nfs_receive() at nfs_receive+0x29f
> nfs_reply() at nfs_reply+0x46
> nfs_request() at nfs_request+0x374
> nfs_writerpc() at nfs_writerpc+0x22b
> nfs_doio() at nfs_doio+0x4a0
> nfssvc_iod() at nfssvc_iod+0x1c4
> fork_exit() at fork_exit+0xd1
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip = 0, rsp = 0xffffffffb4019d00, rbp = 0 ---
> 
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