kernel warning in syscall

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 8b21413cae5f parlib: Basic implementation of sigaltstack
git tree: https://github.com/akaros/akaros.git/master
console output: https://syzkaller.appspot.com/x/log.txt?x=10be189c400000
kernel config: https://syzkaller.appspot.com/x/.config?x=efef8cf2939304d3
dashboard link: https://syzkaller.appspot.com/bug?extid=f6346c574b0ec43e474d
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+f6346c...@syzkaller.appspotmail.com

�kernel warning at kern/src/ns/convM2D.c:52, from core 3: �nbuf 121,
STAT_FIX_LEN_9P 49 BIT16SZ 2, GBIT16(buf) 0
_Stack Backtrace on Core 3:
�#01 [<0xffffffffc200a30c>؁�;���� 5�k�l�"47���q�$�G� ��lG1]��
��3�R H�$ ��� ���x(�zS�ֽ"� � ����&���` � + �~l�:�[� �]q_�Xɼ
He e =^ � �� ��#���o��cin backtrace
`#02 [<0xffffffffc2009ba4>] in _warn
4#034 [<0xfffŸff�fffc203 4cd��(3G d>] �8in statchec S ���k
k�#04�� [<0�]xffff�ff�ffc QWA203df88>] in vali�dstat
#05 [<0xffffffffc203efee>] in sysfwstat
|� {Ұ�� 4M�Y�� #06 [<0xffffffffc2055d10>] in sys_fwst a ��Qt
#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
kernel warning at kern/src/ns/convM2D.c:52, from core 1: nbuf 76,
STAT_FIX_LEN_9P 49 BIT16SZ 2, GBIT16(buf) 0
Stack Backtrace on Core 1:
#01 [<0xffffffffc200a30c>] in backtrace at src/kdebug.c:220
#02 [<0xffffffffc2009ba4>] in _warn at src/init.c:323
#03 [<0xffffffffc2034cdd>] in statcheck at src/ns/convM2D.c:51
#04 [<0xffffffffc203df88>] in validstat at src/ns/sysfile.c:961
#05 [<0xffffffffc203efee>] in sysfwstat at src/ns/sysfile.c:421
#06 [<0xffffffffc2055d10>] in sys_fwstat at src/syscall.c:2271
#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


---
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[barret rhoden]

#syz dup kernel warning in statcheck

[syzbot]

> #syz dup kernel warning in statcheck

unknown command "dup"

[syzbot]

> #syz dup kernel warning in statcheck

unknown command "dup"

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[barret rhoden]

#syz dup: kernel warning in statcheck