From owner-freebsd-alpha  Mon Jan 21  6:13:37 2002
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Date: Mon, 21 Jan 2002 09:13:02 -0500 (EST)
To: Bernd Walter <ticso@cicely8.cicely.de>
Cc: freebsd-alpha@FreeBSD.ORG
Subject: Re: 4.5-RC panic
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Bernd Walter writes:
 > (kgdb) bt
 > #0  0xfffffc000037fdc0 in dumpsys () at ../../kern/kern_shutdown.c:472
 > #1  0xfffffc000037f988 in boot (howto=256) at ../../kern/kern_shutdown.c:313
 > #2  0xfffffc00003801d0 in panic (fmt=0xfffffc000051c3dc "trap") at ../../kern/kern_shutdown.c:581
 > #3  0xfffffc00004dba60 in trap (a0=4833124384, a1=4832532772, a2=0, entry=2, framep=0xfffffe00071d3a40)
 >     at ../../alpha/alpha/trap.c:551
 > #4  0xfffffc00004cd97c in XentMM ()
 > #5  0xfffffc00004dbcc4 in syscall (code=344, framep=0xfffffe00071d3ee0) at ../../alpha/alpha/trap.c:655
 > 
 > dmesg:

<...>

 > fatal kernel trap:
 > 
 >     trap entry = 0x2 (memory management fault)
 >     a0         = 0x12013a020
 >     a1         = 0x1
 >     a2         = 0x0
 >     pc         = 0xfffffc00004d035c
 >     ra         = 0xfffffc00004dbcc4
 >     curproc    = 0xfffffe0005c6efc0
 >         pid = 268, comm = tcsh

Truly bizzare.  Its trap'ping on what looks like user-space address
somewhere in the user proc's heap.  a2 is 0, so its a load.  What
pointer had this value?

The syscall in question (344) is sigreturn. I haven't been keeping up
with committers in the last few months.  Has anything changed lately
wrt. signal delivery?  

Can you disassemble this and see if its faulting on the call or the return?

Drew

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