Date: Mon, 29 Nov 1999 17:45:04 -0500 (EST) From: "Viren R.Shah" <viren@rstcorp.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: Greg Lehey <grog@lemis.com>, freebsd-current@FreeBSD.ORG Subject: Re: repeatable crash in -current (softupdates, NFS) Message-ID: <14403.496.341437.658744@jabberwock.rstcorp.com> In-Reply-To: <199911292155.NAA09688@apollo.backplane.com> References: <14399.63511.296802.242618@jabberwock.rstcorp.com> <19991127195332.36233@mojave.sitaranetworks.com> <14402.62513.189527.729294@jabberwock.rstcorp.com> <199911292155.NAA09688@apollo.backplane.com>
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>>>>> "Matt" == Matthew Dillon <dillon@apollo.backplane.com> writes:
Matt> The problem is a NULL pointer dereference somewhere... please
Matt> nm your kernel binary and extract out all elements with c0163
Matt> in them. e.g. nm /kernel | fgrep c0163 | sort.
OK, here's a -current system from today (11/29) morning [4am EST] with
kernel compiled with DDB and -g.
FreeBSD jabberwock 4.0-CURRENT FreeBSD 4.0-CURRENT #0: Mon Nov 29
17:11:27 EST 1999
vshah@jabberwock:/home/ncvs/FreeBSD/current-src/src/sys/compile/J39
i386
Tried doing a simple symlink over a NFS mounted filesystem:
fatal trap 12: page fault while in kernel mode
fault virtual address = 0x4
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0167979
stack pointer = 0x10:0xc9d74e40
frame pointer = 0x10:0xc9d74e58
code segment = base 0x0; limit 0xfffff, type 0x1b
= DPL0, pres 1, def32 1, gran 1
processor flags = interrupt enabled, resume, 10PL = 0
current process = 315 (ln)
interrupt mask = none
kernel: type 12 trap code = 0
db> trace
vput(0) at vput+0x11
symlink (c9d4e200, c9d74f80, bfbfdab5, bfbfda9e, bfbfd99c) at symlink+0x1e3
syscall(2f, 2f, 2f, bfbfd99c, bfbfda9e) at syscall+0x176
Xint0x80_syscall() at Xint0x80_syscall+0x26
db> show reg
...
eip 0xc0167979 vput+0x11
efl 0x10286 nfs_write+0xe2
Hope this helps. If there is anything else I can do to debug this, let
me know.
Viren
--
Viren Shah | "You can't trust code that you did not totally
Research Associate, RST Inc. | create yourself. (Especially code from
viren@rstcorp.com | companies that employ people like me.)"
http://www.rstcorp.com/~vshah | - Ken Thompson "Reflections on Trusting Trust"
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