Date: Tue, 12 Dec 2017 16:55:56 -0500 From: John Baldwin <jhb@FreeBSD.org> To: Eugene Grosbein <eugen@grosbein.net>, 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: <e2c426c3-41ed-2dd8-c5d4-15c60d8f7303@FreeBSD.org> In-Reply-To: <5A30378A.3040609@grosbein.net> References: <201712110432.vBB4WbnE021090@repo.freebsd.org> <20171211091943.GF2272@kib.kiev.ua> <5A2E5D44.9030904@grosbein.net> <4a9c76c9-8063-9420-b198-14487b089840@FreeBSD.org> <5A30378A.3040609@grosbein.net>
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On 12/12/17 3:09 PM, Eugene Grosbein wrote: > 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>: My point is that you should compare gcc with clang as 10.x switched to clang and that may be a factor in the stack overflows beginning with 10.x. -- John Baldwin
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