syzbot

kernel warning at kern/src/ns/convM2D.c:52, from core 0: nbuf 209, STAT_FIX_LEN_9P 49 BIT16SZ 2, GBIT16(buf) 0 
Stack Backtrace on Core 0:
#01 [<0xffffffffc200a33c>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009bd4>] in _warn at src/init.c:323
#03 [<0xffffffffc2034d1d>] in statcheck at src/ns/convM2D.c:51
#04 [<0xffffffffc203dfc8>] in validstat at src/ns/sysfile.c:961
#05 [<0xffffffffc203f02e>] in sysfwstat at src/ns/sysfile.c:421
#06 [<0xffffffffc2055d50>] in sys_fwstat at src/syscall.c:2264
#07 [<0xffffffffc2059569>] in syscall at src/syscall.c:2455
#08 [<0xffffffffc2059734>] in run_local_syscall at src/syscall.c:2490
#09 [<0xffffffffc2059c69>] in prep_syscalls at src/syscall.c:2510
#10 [<0xffffffffc20ab5fa>] in sysenter_callwrapper at arch/x86/trap.c:854