what to replace splnet in FreeBSD 5.x?

[Robert Watson]

On Tue, 2 Aug 2005, Ed Maste wrote:

>>> Spl-related cleanups (no longer useful documentation of old 
>>> synchronization in many places), lock order hard-coded into WITNESS 
>>> order rather than dynamically detected.
>>
>> Have you had a chance to run with this patch as yet?  If possible, I'd 
>> like to get it merged to 7.x-CURRENT so we can backport it for 6.0.
>
> I finally got our local CVS repository back into shape and gave this 
> patch a try.  Unfortunately got a panic as soon as our multicast app 
> started up:
>
> panic: _mtx_lock_sleep: recursed on non-recursive mutex in_multi_mtx @ 
> /d2/emaste/cvs_mcast/src/sys/netinet/ip_output.c:298

For now, we can flag in_multi_mtx as MTX_RECURSE in the mtx_init() call in 
in_var.h, but a better answer is probably desirable.

Robert N M Watson

>
> cpuid = 0
> KDB: stack backtrace:
> kdb_backtrace(100,a2894300,a07eba00,a07eba00,12a) at 0xa0586915 = kdb_backtrace+0x29
> panic(a071a883,a071f26e,a0729680,12a,a07eba00) at 0xa056eeb8 = panic+0x114
> _mtx_lock_sleep(a07eba00,a2894300,0,a0729680,12a) at 0xa05669cb = _mtx_lock_sleep+0x33
> _mtx_lock_flags(a07eba00,0,a0729680,12a,0) at 0xa05664ba = _mtx_lock_flags+0x8a
> ip_output(a2645e00,a2649100,a07eb9b0,0,c8635b08) at 0xa05f7b0e = ip_output+0x3fe
> igmp_sendpkt(a24b9de0,16,0,a24b9de0,c8635bb8) at 0xa05e292e = igmp_sendpkt+0x106
> igmp_joingroup(a24b9de0,a2504240,210,240600ef,0) at 0xa05e2642 = igmp_joingroup+0x92
> in_addmulti(c8635bcc,a23a1400,a23a1400,240600ef,1000001) at 0xa05e437e = in_addmulti+0x10e
> ip_setmoptions(a272c7f8,c8635c90,a071a701,12c,0) at 0xa05f9278 = ip_setmoptions+0x3a0
> ip_ctloutput(a27c2650,c8635c90,a283a22c,0,a0722810) at 0xa05f8a57 = ip_ctloutput+0x36b
> sosetopt(a27c2650,c8635c90,a26af798,1,0) at 0xa05a91ac = sosetopt+0x2c
> kern_setsockopt(a2894300,b,0,c,9fbfcd60) at 0xa05ada71 = kern_setsockopt+0xb5
> setsockopt(a2894300,c8635d04,5,3,246) at 0xa05ad9ba = setsockopt+0x1e
> syscall(81e003b,81e003b,9fbf003b,9fbfcd70,841fc28) at 0xa06c72fb = syscall+0x25b
>
> in_addmulti holds the in_multi_mtx when it calls _joingroup.
>
> I haven't yet looked over the whole patch to understand the
> specifics.  I'll post again once I do if I have any ideas.
>
> --
> Ed Maste, Sandvine Incorporated.
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