svn commit: r326758 - in head/sys/i386: conf include

[John Baldwin]

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