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To: Roman Shterenzon <roman@harmonic.co.il>
Cc: FreeBSD-gnats-submit@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: kern/32184: Kernel crashes in ufs code 
In-Reply-To: Your message of "Thu, 22 Nov 2001 13:12:54 +0200."
             <200111221112.fAMBCs300652@alchemy.oven.org> 
Date: Thu, 22 Nov 2001 13:58:49 +0000
From: Ian Dowse <iedowse@maths.tcd.ie>
Message-ID:  <200111221358.aa08693@salmon.maths.tcd.ie>
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In message <200111221112.fAMBCs300652@alchemy.oven.org>, Roman Shterenzon write
s:
>
>>Synopsis:       Kernel crashes in ufs code

The first trap occurs at frame #18 in xl_newbuf(). This is the
frame of interest. The UFS trap is probably caused by the kernel
attempting to sync the disks before rebooting at an inappropriate
time.

The line in question is

	MCLGET(m_new, M_DONTWAIT);

so some sort of mbuf cluster free-list corruption has probably
occurred. Tracking down such problems is not particularly easy...

Ian

>#17 0xc0274e2f in trap (frame={tf_fs = 16, tf_es = 16, tf_ds = 16, 
>      tf_edi = -1062710272, tf_esi = 6685184, tf_ebp = -1070806476, 
>      tf_isp = -1070806508, tf_ebx = -1062710272, tf_edx = -1063047168, 
>      tf_ecx = -264341449, tf_eax = 389973, tf_trapno = 12, tf_err = 0, 
>      tf_eip = -1071728840, tf_cs = 8, tf_eflags = 66050, 
>      tf_esp = -1062819840, tf_ss = -1059785052}) at ../../i386/i386/trap.c:44
>8
>#18 0xc01eb738 in xl_newbuf (sc=0xc0d4f000, c=0xc0d4f6a4)
>    at ../../pci/if_xl.c:1724
>#19 0xc01eb90a in xl_rxeof (sc=0xc0d4f000) at ../../pci/if_xl.c:1825
>#20 0xc01ec048 in xl_intr (arg=0xc0d4f000) at ../../pci/if_xl.c:2060
>#21 0xc027d917 in intr_mux (arg=0xc0a34800)
>    at ../../i386/isa/intr_machdep.c:582

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