Date: Sun, 11 Apr 2004 23:54:36 +0200 From: "Simon L. Nielsen" <simon@FreeBSD.org> To: freebsd-current@freebsd.org Cc: Mark Murray <markm@FreeBSD.org> Subject: random(4) related panic: sleeping without a mutex Message-ID: <20040411215436.GB881@zaphod.nitro.dk>
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Hello
I getting the following panic on my Soekris Net4801 box right after init
has been started:
Mounting root from ufs:/dev/ad0s1a
start_init: trying /sbin/init
panic: sleeping without a mutex
at line 144 in file /data/nanobsd/src/sys/kern/kern_synch.c
Debugger("panic")
Stopped at Debugger+0x45: xchgl %ebx,in_Debugger.0
db> trace
Debugger(c0636dcb) at Debugger+0x45
__panic(c06375fc,90,c06375d4,c8758b70,c04cc4ee) at __panic+0xc7
msleep(c0682740,0,1a0,c06476ac,0) at msleep+0xae
random_read(c06865a4,c8758c88,20000,c065bfe0,74) at random_read+0x41
spec_read(c8758bec,c8758c38,c052853c,c8758bec,20000) at spec_read+0x110
spec_vnoperate(c8758bec) at spec_vnoperate+0x13
vn_read(c17f1aa0,c8758c88,c0ac2d80,0,c1777540) at vn_read+0x1a0
dofileread(c1777540,c17f1aa0,7,bfbfcb6c,74) at dofileread+0xb0
read(c1777540,c8758d14,3,4,296) at read+0x3b
syscall(2f,2f,2f,bfbfeea8,7) at syscall+0x217
Xint0x80_syscall() at Xint0x80_syscall+0x1d
--- syscall (3, FreeBSD ELF32, read), eip =3D 0x280c15e7, esp =3D 0xbfbfcb2=
c, ebp =3D 0xbfbfcbf8 ---
It seems related to Mark Murray latest random(4) updates. This is with
-CURRENT from today. I can trace the problem to the tsleep call in :
sys/dev/random/randomdev.c:106:
/* Blocking logic */
while (!random_systat.seeded && !error) {
if (flag & IO_NDELAY)
error =3D EWOULDBLOCK;
else
error =3D tsleep(&random_systat,
PUSER | PCATCH, "block", 0);
}
But my kernel foo is not sufficient to make more sense out of that, so I
hope somebody else can. It happens both with my custom kernel config
and GENERIC.
I don't have a gdb trace since the box only has a flash card so it's a
bit difficult to create one, but if it's important I can probably find a
way - just let me know.
--=20
Simon L. Nielsen
FreeBSD Documentation Team
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