diagnostic assertion "solocked2(so, so2)" failed

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hi,
I got this panic on a netbsd-5 kernel:
panic: kernel diagnostic assertion "solocked2(so, so2)" failed: file 
"/home/bouyer/src-5/src/sys/kern/uipc_usrreq.c", line 559                       
           
fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c03d035c cs 8 eflags 246 cr2 8077132 ilevel 4
Stopped in pid 23735.1 (sendmail) at    netbsd:breakpoint+0x4:  popl    %ebp
db{1}> bt
breakpoint(c06341a3,d2c43b38,c2cca800,c0312a97,bf157f98,c32fdf3d,c,c0329cb3, 
50435051,c2cca800) at netbsd:breakpoint+0x4
panic(c0673c38,c05f9771,c062a2f9,c062a8f0,22f,d2c43c5c,d2c43b7c,c0364825,c05f9771,c062a8f0)
 at netbsd:panic+0x1b0
__kernassert(c05f9771,c062a8f0,22f,c062a2f9,d2d89d60,d3ba2d40,c32fdf49,d22bc440,0,0)
 at netbsd:__kernassert+0x39
uipc_usrreq(c2ee2a0c,9,c32fdf00,0,0,d1e4bd20,3,c43be0,c2ee2a64,0) at 
netbsd:uipc_usrreq+0x965
sosend(c2ee2a0c,0,d2c43c94,c32fdf00,0,0,d1e4bd20,9,0,2) at netbsd:sosend+0x403
soo_write(d1b7b7c0,d1b7b7c0,d2c43c94,d1b69840,1,3,d1b7b7c0,d2c43c54,0,10) at 
netbsd:soo_write+0x3e
do_filewritev(5,bf157f30,2,d1b7b7c0,1,d2c43d28,d2c43d3c,c03d8908,d1e4bd20,d2c43d00)
 at netbsd:do_filewritev+0x190
sys_writev(d1e4bd20,d2c43d00,d2c43d28,8077000,d2d89d60,d2d89d60,1,5,bf157f30,2) 
at netbsd:sys_writev+0x37
syscall(d2c43d48,b3,ab,bf15001f,affd001f,1,bf157f98,bf157f58,afd2a0b0,0) at 
netbsd:syscall+0xc8
db{1}>

Does it ring a bell to someone ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--