kernel warning in syswstat

Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported
kernel warning in statcheck	C			846880	2033d	2096d

846880

2033d

2096d

kernel warning at kern/src/ns/convM2D.c:52, from core 2: Onbuf 76, STAT_FIX_LEN_9P 49 BIT16SZ 2, GBIT16(buf) 0 e
_€Êï¿½Stack Backtrace on Core 2:
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M#01 [<0xffffffffc200a30c>] in backtrace
$#02 [<0xffffffffc2009ba4>] in _warn
3#03 [<0xffffffffc2034cdd>] in statcheck
ô%PÚ(œ¢!ç´'Äk#04 [<0xffffffffc203df88>] in validstat
#05 [<0xffffffffc203e146>] in syswstat at src/ns/sysfile.c:1159
#06 [<0xffffffffc2055ccf>] in sys_wstat at src/syscall.c:2263
#07 [<0xffffffffc20594d9>] in syscall at src/syscall.c:2462
#08 [<0xffffffffc20596a4>] in run_local_syscall at src/syscall.c:2497
#09 [<0xffffffffc2059bd9>] in prep_syscalls at src/syscall.c:2517
#10 [<0xffffffffc20ab56a>] in sysenter_callwrapper at arch/x86/trap.c:854