Date: Tue, 28 Mar 2000 13:42:46 -0500 (EST) From: David Gilbert <dgilbert@velocet.ca> To: freebsd-current@freebsd.org, Archie Cobbs <archie@whistle.com> Subject: Kernel trace question (kernel doesn't compile _without_ -O) Message-ID: <14560.64806.608659.960815@trooper.velocet.net>
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I'm puzzled over the following kernel trace. 'm' in frame 6 is
clearly not null... but in frame 5, it is. I have compiled the
ng_l2tp module without -O... just in case that was the problem, but
line 391 (the for loop) explicitly tests m for NULLness anyways.
Also... I have noticed that several modules don't want to compile in
the kernel without -O, including kern_synch.c (undefined reference to
__cursig) and atomic.c (inconsistent operand constraints in an `asm').
(kgdb) bt
#0 boot (howto=256) at ../../kern/kern_shutdown.c:304
#1 0xc0155ed5 in panic (fmt=0xc026010f "page fault")
at ../../kern/kern_shutdown.c:554
#2 0xc022557a in trap_fatal (frame=0xc0269d58, eva=16)
at ../../i386/i386/trap.c:924
#3 0xc022522d in trap_pfault (frame=0xc0269d58, usermode=0, eva=16)
at ../../i386/i386/trap.c:817
#4 0xc0224db3 in trap (frame={tf_fs = -1071251440, tf_es = 9502736,
tf_ds = 16, tf_edi = 96, tf_esi = 1, tf_ebp = -1071211080,
tf_isp = -1071211132, tf_ebx = 0, tf_edx = 0, tf_ecx = 0, tf_eax = 0,
tf_trapno = 12, tf_err = 0, tf_eip = -1072237390, tf_cs = 8,
tf_eflags = 66054, tf_esp = -1038559808, tf_ss = -1072044908})
at ../../i386/i386/trap.c:423
#5 0xc016f4b2 in m_dup (m=0x0, how=1) at ../../kern/uipc_mbuf.c:763
#6 0xc019e4f3 in ngl2tp_ctrlq_timeout (arg=0xc218d5c0)
at ../../netgraph/ng_l2tp.c:393
#7 0xc015b245 in softclock () at ../../kern/kern_timeout.c:131
(kgdb) frame 6
#6 0xc019e4f3 in ngl2tp_ctrlq_timeout (arg=0xc218d5c0)
at ../../netgraph/ng_l2tp.c:393
393 n = m_dup(m, M_NOWAIT);
(kgdb) l
388 int i, error = 0;
389 u_char *d;
390
391 for(m=p->ctrlq, i=0; m && i < p->Swin; m = m->m_nextpkt, i++)
392 {
393 n = m_dup(m, M_NOWAIT);
394 if(n)
395 {
396 d = mtod(n, u_char *);
397 *((u_int16_t *)(d+10)) = htons(p->Nr); /* update window recd */
(kgdb) p m
$1 = (struct mbuf *) 0xc0752280
--
============================================================================
|David Gilbert, Velocet Communications. | Two things can only be |
|Mail: dgilbert@velocet.net | equal if and only if they |
|http://www.velocet.net/~dgilbert | are precisely opposite. |
=========================================================GLO================
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