Date: Mon, 10 Feb 2003 12:10:16 -0800 (PST) From: "Marc G. Fournier" <scrappy@hub.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/48029: Fatal trap 12: page fault while in kernel mode Message-ID: <200302102010.h1AKAGxK006926@freefall.freebsd.org>
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The following reply was made to PR kern/48029; it has been noted by GNATS.
From: "Marc G. Fournier" <scrappy@hub.org>
To: David Schultz <dschultz@uclink.Berkeley.EDU>
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/48029: Fatal trap 12: page fault while in kernel mode
Date: Mon, 10 Feb 2003 16:06:57 -0400 (AST)
On Mon, 10 Feb 2003, David Schultz wrote:
> Hmm...if my understanding is correct, it shouldn't be making that
> bcopy at all from the syncer daemon. Can you please show me that
> uio structure (and maybe bp, too) in ffs_write()? Is this problem
> reproduceable, and did it happen with kernels from before December
> 31st? I will see if I can figure out what is going on this
> weekend, but I'm no Matt Dillon, so there are no guarantees.
If I've done this wrong, please say so, but:
(kgdb) print *uio
$2 = {uio_iov = 0xea667d04, uio_iovcnt = 1, uio_offset = 0, uio_resid = 8192, uio_segflg = UIO_SYSSPACE, uio_rw = UIO_WRITE, uio_procp = 0x0}
and
(kgdb) print *bp
$4 = {b_hash = {le_next = 0xd40eecec, le_prev = 0xd434485c}, b_vnbufs = {tqe_next = 0x0, tqe_prev = 0xece7a7ec}, b_freelist = {tqe_next = 0x0, tqe_prev = 0xc02429e0}, b_act = {tqe_next = 0x0, tqe_prev = 0xc76b84b4}, b_flags = 536870944,
b_qindex = 0, b_xflags = 2 '\002', b_lock = {lk_interlock = {lock_data = 0}, lk_flags = 1024, lk_sharecount = 0, lk_waitcount = 0, lk_exclusivecount = 1, lk_prio = 20, lk_wmesg = 0xc02186f0 "bufwait", lk_timo = 0, lk_lockholder = 5},
b_error = 0, b_bufsize = 8192, b_runningbufspace = 0, b_bcount = 8192, b_resid = 0, b_dev = 0xffffffff, b_data = 0xdb1b5000 "", b_kvabase = 0xdb1b5000 "", b_kvasize = 16384, b_lblkno = 0, b_blkno = 58729680, b_offset = 0, b_iodone = 0,
b_iodone_chain = 0x0, b_vp = 0xece7a7c0, b_dirtyoff = 0, b_dirtyend = 0, b_rcred = 0x0, b_wcred = 0x0, b_pblkno = 49481871, b_saveaddr = 0x0, b_driver1 = 0x0, b_driver2 = 0x0, b_caller1 = 0x0, b_caller2 = 0x0, b_pager = {pg_spc = 0x0,
pg_reqpage = 0}, b_cluster = {cluster_head = {tqh_first = 0xd41a1db8, tqh_last = 0xd411bd64}, cluster_entry = {tqe_next = 0xd41a1db8, tqe_prev = 0xd411bd64}}, b_pages = {0xc1c9abec, 0xc1d37528, 0x0 <repeats 30 times>}, b_npages = 2, b_dep = {
lh_first = 0x0}, b_chain = {parent = 0x0, count = 0}}
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