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The following reply was made to PR kern/39777; it has been noted by GNATS.
From: Matthias Scheler <tron@xxxxxxxxxxxxx>
To: netbsd-bugs@xxxxxxxxxx
Cc: gnats-bugs@xxxxxxxxxx
Subject: Re: kern/39777: NFS client triggers kernel panics
Date: Fri, 31 Oct 2008 18:30:12 +0000
I've looked at the faulting bit of code:
db{0}> examine/i netbsd:_bus_dmamap_load_mbuf,10
netbsd:_bus_dmamap_load_mbuf: pushq %rbp
netbsd:_bus_dmamap_load_mbuf+0x1: movq %rsp,%rbp
netbsd:_bus_dmamap_load_mbuf+0x4: pushq %r15
netbsd:_bus_dmamap_load_mbuf+0x6: pushq %r14
netbsd:_bus_dmamap_load_mbuf+0x8: pushq %r13
netbsd:_bus_dmamap_load_mbuf+0xa: pushq %r12
netbsd:_bus_dmamap_load_mbuf+0xc: movq %rsi,%r12
netbsd:_bus_dmamap_load_mbuf+0xf: pushq %rbx
netbsd:_bus_dmamap_load_mbuf+0x10: subq $0x58,%rsp
netbsd:_bus_dmamap_load_mbuf+0x14: movq %rdi,0xffffffffffffffb0(%rbp)
netbsd:_bus_dmamap_load_mbuf+0x18: movq %rdx,0xffffffffffffffa8(%rbp)
netbsd:_bus_dmamap_load_mbuf+0x1c: movl %ecx,0xffffffffffffffa4(%rbp)
netbsd:_bus_dmamap_load_mbuf+0x1f: movq 0x30(%rsi),%rax
netbsd:_bus_dmamap_load_mbuf+0x23: movq %rax,0xffffffffffffffb8(%rbp)
netbsd:_bus_dmamap_load_mbuf+0x27: movq $0,0x40(%rsi)
netbsd:_bus_dmamap_load_mbuf+0x2f: movl $0,0x48(%rsi)
The kernel crashes at netbsd:_bus_dmamap_load_mbuf+0x14 which tries
to access the stack space it previously created.
This looks like a stack overflow to me.
Kind regards
--
Matthias Scheler http://zhadum.org.uk/
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