Re: malloc(M_WAITOK) of "Mbuf", forcing M_NOWAIT .. raw_ip.c:740

On Wed, 15 Sep 2004, Bjoern A. Zeeb wrote:

> Hi,
> 
> on a machine 61 days uptime I've just seen this in all the dmesg.
> 
> The kernel is from
> FreeBSD 5.2-CURRENT #4: Fri Jul 16 11:53:55 UTC 2004
> sources from about 0-3 days before.
> 
> looks partly similar to kern/68323.
> 
> I cannot see any changes in raw_ip.c > line 560 within the last
> two months but a lot of other things have changed since then.

I believe this one is fixed in -CURRENT, as the M_TRYWAIT argument to
M_PREPEND() in raw_ip.c was converted to an M_DONTWAIT.  That change was
committed on 7/20/2004 (1.136), so it looks like it was made just a few
days after the tree you're running with was checked out.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> --- cut ---
> malloc(M_WAITOK) of "Mbuf", forcing M_NOWAIT with the following non-sleepable locks held:
> exclusive sleep mutex rip r = 0 (0xc06871cc) locked _at_ /u2/src/HEAD/src/sys/netinet/raw_ip.c:740
> KDB: stack backtrace:
> kdb_backtrace(1,c2b1ec00,c2444b40,14,cb48ab50) at kdb_backtrace+0x29
> witness_warn(5,0,c05ff4da,c05e4685) at witness_warn+0x182
> uma_zalloc_arg(c2444b40,cb48ab74,2) at uma_zalloc_arg+0x38
> m_prepend(c2b1ec00,14,2,c2b899e0,c289c370) at m_prepend+0x52
> rip_output(c2b1ec00,c2b899e0,23efea9,580,c2b1ec00) at rip_output+0x99
> rip_ctlinput(c2b899e0,0,c2b1ec00,c289c370,0) at rip_ctlinput+0x7a2
> sosend(c2b899e0,c289c370,cb48ac54,c2b1ec00,0) at sosend+0x5b0
> kern_sendit(c29a22c0,3,cb48accc,0,0) at kern_sendit+0xd1
> socketpair(c29a22c0,3,cb48accc,0,804f2d4) at socketpair+0x479
> sendto(c29a22c0,cb48ad14,6,151,296) at sendto+0x4d
> syscall(2f,2f,2f,804ed54,804ed54) at syscall+0x1eb
> Xint0x80_syscall() at Xint0x80_syscall+0x1f
> --- syscall (133, FreeBSD ELF32, sendto), eip = 0x280e42bf, esp = 0xbfbee80c, ebp = 0xbfbee848 ---
> --- cut ---
> 
> 
> PS: I will not be able to test anything related to this before next
> tue - sorry. if you need further information please let me know and
> I'll see what I can do.
> 
> -- 
> Greetings
> Bjoern A. Zeeb				bzeeb at Zabbadoz dot NeT
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