Date: Sat, 9 Mar 2002 11:52:08 -0800 (PST) From: Archie Cobbs <archie@dellroad.org> To: freebsd-stable@freebsd.org Cc: Tor.Egge@cvsup.no.freebsd.org, dillon@apollo.backplane.com Subject: Re: M_NOWAIT is waiting anyway..? Message-ID: <200203091952.g29Jq8B54534@arch20m.dellroad.org> In-Reply-To: <200203082112.g28LCcl48040@arch20m.dellroad.org> "from Archie Cobbs at Mar 8, 2002 01:12:38 pm"
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Archie Cobbs writes:
> I'm seeing a panic that suggests that the kernel malloc() implementation
> is broken with respect to M_NOWAIT, hard to believe as that is.
> Here's the trace:
>
> > panic: tsleep1
> > Debugger("panic")
> > Stopped at Debugger+0x34: movb $0,in_Debugger.426
> > db> tr
> > Debugger(c025f03b) at Debugger+0x34
> > panic(c025f50c,c02befd0,1000000,ffffffff,34) at panic+0x70
> > tsleep(c02befd0,4,c0279394,0,c02befd0) at tsleep+0x5e
> > acquire(c02befd0,1000000,600,1,c02b3540) at acquire+0x88
> > lockmgr(c02befd0,2,0,0,1) at lockmgr+0x248
> > kmem_malloc(c02befa0,1000,1,0,c06fb700) at kmem_malloc+0x54
> > malloc(c,c02b3540,1,0,c06fb700) at malloc+0x246
FYI, for the benefit of the -stable list..
In an offline conversation Tor Egge and Matt Dillon found
and fixed this bug, which has existed since FreeBSD 3.2.
In fact, it is possible to sleep in malloc() with M_NOWAIT.
The fix (which presumably will be MFC'd soon) was applied to
-current in rev. 1.75 of sys/vm/vm_kern.c:
http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/vm/vm_kern.c
This patch applies to -stable as well as -current.
Thanks Tor and Matt!
-Archie
__________________________________________________________________________
Archie Cobbs * Packet Design * http://www.packetdesign.com
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