kernel warning in sys_fwstat

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 8dc899e19d0f vmm: x86: Set the reserved bits in rflags
git tree: https://github.com/akaros/akaros.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=12e62f94400000
kernel config: https://syzkaller.appspot.com/x/.config?x=efef8cf2939304d3
dashboard link: https://syzkaller.appspot.com/bug?extid=bbd3f1bf47831b264b14
compiler:

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+bbd3f1...@syzkaller.appspotmail.com

�kernel warning at kern/src/ns/convM2D.c:52, from core 3: pnbuf
37, �STAT_FIX_LEnN_9P 49 BIT16SZ 2, GBITd16(buf) 0 �
x�swWStack Backtrace on Core 3:
A#�Ƶڹ69��~z 01 [<0xffffffffc2�00a2dc>q�] in backtraا�{��Vce
�#02 [�<*0���x�ff�� fffff?fc2009b9�4>]��&� ���/����� ��׀ C�#�IW4
�� Q�=i�ǶȀe0՝�n Qf��x_���warn
#03 [<0xffffffffc2034c0d>] in statcheck
�#0�4 [<0xffffffffc203deb8>] in validstat
+#05 ��9�2 �[<0xfffffbfffc203eft$vLx�z� u��e �$ � � K AN�'D8P,�1l�-z ��e P>�]
in
s/-�y���62\�9� ��sQ��v�� �.tlM*��fwstat
#06 [<0xffffffffc2055c70>] in sys_fwstat at src/syscall.c:2337
#07 [<0xffffffffc2059409>] in syscall at src/syscall.c:2528
#08 [<0xffffffffc20595d4>] in run_local_syscall at src/syscall.c:2563
#09 [<0xffffffffc2059b09>] in prep_syscalls at src/syscall.c:2583
#10 [<0xffffffffc20ab36a>] in sysenter_callwrapper at arch/x86/trap.c:854


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[barret rhoden]

#syz dup kernel warning in statcheck

[syzbot]

> #syz dup kernel warning in statcheck

unknown command "dup"

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[syzbot]

> #syz dup kernel warning in statcheck

unknown command "dup"

[barret rhoden]

#syz dup: kernel warning in statcheck