kernel warning in sysfwstat

[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=152ed254400000
kernel config: https://syzkaller.appspot.com/x/.config?x=efef8cf2939304d3
dashboard link: https://syzkaller.appspot.com/bug?extid=48c0606f3b8f0af4bfd2
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+48c060...@syzkaller.appspotmail.com

kernel warning at kern/src/ns/convM2D.c:52, from core 1: nbuf 123,
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
g#03 [< 0xf�ff�fG ��ȥ�ffffc2�034cdd>] in statcheck1
;#04 [<0��Q�9�xf�� f�fffff! ���¿ fT�c2 SZ��|�03df88>] in validstat
#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
kernel warning at kern/src/ns/convM2D.c:52, from core 2: nbuf 174,
STAT_FIX_LEN_9P 49 BIT16SZ 2, GBIT16(buf) 0
Stack Backtrace on Core 2:
#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 [<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


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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