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Date:      Wed, 13 Dec 2017 03:09:46 +0700
From:      Eugene Grosbein <eugen@grosbein.net>
To:        John Baldwin <jhb@FreeBSD.org>, Konstantin Belousov <kostikbel@gmail.com>, Conrad Meyer <cem@FreeBSD.org>
Cc:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   Re: svn commit: r326758 - in head/sys/i386: conf include
Message-ID:  <5A30378A.3040609@grosbein.net>
In-Reply-To: <4a9c76c9-8063-9420-b198-14487b089840@FreeBSD.org>
References:  <201712110432.vBB4WbnE021090@repo.freebsd.org> <20171211091943.GF2272@kib.kiev.ua> <5A2E5D44.9030904@grosbein.net> <4a9c76c9-8063-9420-b198-14487b089840@FreeBSD.org>

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On 13.12.2017 02:32, John Baldwin wrote:

> Certainly for MIPS I have found that compiling with clang
> instead of gcc for mips64 gives a kernel that panics for stack overflow for any
> use of NFS.  It might be that this is due to something MIPS-specific, but it
> might be worthwhile retesting with kstack_pages=2 and building the kernel
> with CROSS_TOOLCHAIN=i386-gcc after installing the appropriate package.

You may want to check NFS code that uses stack heavily.
Here are numbers for i386 (bytes-on-stack, module, what function):

1344 nfs_nfsdport.o <nfssvc_nfsd>:
1152 nfs_nfsdserv.o <nfsrvd_lockt>:
1128 nfs_nfsdserv.o <nfsrvd_lock>:
952 nfs_nfsdserv.o <nfsrvd_rename>:
664 nfs_nfsdserv.o <nfsrvd_open>:
640 nfs_nfsdserv.o <nfsrvd_link>:
624 nfs_nfsdserv.o <nfsrvd_create>:
608 nfs_nfsdserv.o <nfsrvd_mknod>:
600 nfs_clvfsops.o <nfs_mount>:





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