Date: Sun, 11 May 1997 16:10:02 -0700 (PDT) From: Tor Egge <Tor.Egge@idi.ntnu.no> To: freebsd-bugs Subject: Re: kern/3438: Use of NFS v3 might cause a trap 12 Message-ID: <199705112310.QAA17412@hub.freebsd.org>
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The following reply was made to PR kern/3438; it has been noted by GNATS.
From: Tor Egge <Tor.Egge@idi.ntnu.no>
To: freebsd-gnats-submit@FreeBSD.ORG
Cc: Subject: Re: kern/3438: Use of NFS v3 might cause a trap 12
Date: Mon, 12 May 1997 01:06:59 +0200
I managed to catch this error at an earlier stage by adding a sanity
check to relpbuf.
This trace is consistent with the scenario mentioned in the
original bug report.
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GDB 4.16 (i386-unknown-freebsd),
Copyright 1996 Free Software Foundation, Inc...
IdlePTD 274000
current pcb at 21e414
panic: relpbuf: physical buffer on vnode clean/dirty list
#0 boot (howto=256) at ../../kern/kern_shutdown.c:265
(kgdb) where
#0 boot (howto=256) at ../../kern/kern_shutdown.c:265
#1 0xe01196b6 in panic (
fmt=0xe01bff5f "relpbuf: physical buffer on vnode clean/dirty list")
at ../../kern/kern_shutdown.c:393
#2 0xe01bffaf in relpbuf (bp=0xe6feebbc) at ../../vm/vm_pager.c:350
#3 0xe01361f3 in cluster_callback (bp=0xe6feebbc)
at ../../kern/vfs_cluster.c:474
#4 0xe01348e8 in biodone (bp=0xe6feebbc) at ../../kern/vfs_bio.c:1559
#5 0xe01610c3 in nfs_doio (bp=0xe6feebbc, cr=0xe50dc780, p=0x0)
at ../../nfs/nfs_bio.c:1020
#6 0xe01802eb in nfssvc_iod (p=0xe3160c00) at ../../nfs/nfs_syscalls.c:804
#7 0xe017ef9e in nfssvc (p=0xe3160c00, uap=0xe94d3f94, retval=0xe94d3f84)
at ../../nfs/nfs_syscalls.c:206
#8 0xe01d4967 in syscall (frame={tf_es = 39, tf_ds = 39, tf_edi = -541073792,
tf_esi = 0, tf_ebp = -541073840, tf_isp = -380813340, tf_ebx = 2,
tf_edx = 0, tf_ecx = 1, tf_eax = 155, tf_trapno = 12, tf_err = 7,
tf_eip = 8917, tf_cs = 31, tf_eflags = 598, tf_esp = -541073900,
tf_ss = 39}) at ../../i386/i386/trap.c:907
#9 0x22d5 in ?? ()
#10 0x107e in ?? ()
(kgdb) up 2
#2 0xe01bffaf in relpbuf (bp=0xe6feebbc) at ../../vm/vm_pager.c:350
(kgdb) print/x *bp
$1 = {b_hash = {le_next = 0x0, le_prev = 0x0}, b_vnbufs = {le_next = 0x0,
le_prev = 0xe385fdb4}, b_freelist = {tqe_next = 0x0,
tqe_prev = 0xe47ea5e8}, b_act = {tqe_next = 0x0, tqe_prev = 0x0},
b_proc = 0x0, b_flags = 0x60020296, b_qindex = 0x0, b_usecount = 0x0,
b_error = 0x0, b_bufsize = 0x2000, b_bcount = 0x2000, b_resid = 0x0,
b_dev = 0xffffffff, b_un = {b_addr = 0xe8210000}, b_kvabase = 0xe8210000,
b_kvasize = 0x2000, b_lblkno = 0x5, b_blkno = 0x50, b_iodone = 0xe0136180,
b_iodone_chain = 0x0, b_vp = 0xe385fd80, b_dirtyoff = 0x0,
b_dirtyend = 0x2000, b_rcred = 0x0, b_wcred = 0xe50dc780, b_validoff = 0x0,
b_validend = 0x0, b_pblkno = 0x0, b_saveaddr = 0x0, b_savekva = 0x0,
b_driver1 = 0x0, b_driver2 = 0x0, b_spc = 0x0, b_cluster = {cluster_head = {
tqh_first = 0xe703911c, tqh_last = 0xe70391ac}, cluster_entry = {
tqe_next = 0xe703911c, tqe_prev = 0xe70391ac}}, b_pages = {0xe0816a18,
0xe07fd74c, 0x0 <repeats 14 times>}, b_npages = 0x2}
(kgdb) print/x *bp->b_vp
$2 = {v_flag = 0x2000, v_usecount = 0x2, v_writecount = 0x1, v_holdcnt = 0xc,
v_lastr = 0x7, v_id = 0x10c6370, v_mount = 0xe45e4200, v_op = 0xe2fe7300,
v_freelist = {tqe_next = 0xe3a3e200, tqe_prev = 0xe3516620}, v_mntvnodes = {
le_next = 0xe5154580, le_prev = 0xe36ab9a8}, v_cleanblkhd = {
lh_first = 0xe7043464}, v_dirtyblkhd = {lh_first = 0xe6feebbc},
v_numoutput = 0x2, v_type = 0x1, v_un = {vu_mountedhere = 0x0,
vu_socket = 0x0, vu_specinfo = 0x0, vu_fifoinfo = 0x0}, v_lease = 0x0,
v_lastw = 0x0, v_cstart = 0x0, v_lasta = 0x0, v_clen = 0x0, v_usage = 0x4,
v_object = 0xe4f64d00, v_interlock = {lock_data = 0x0},
v_vnlock = 0xe3691680, v_tag = 0x2, v_data = 0xe36d4d00}
(kgdb) print bp
$3 = (struct buf *) 0xe6feebbc
(kgdb) print swbuf
$4 = (struct buf *) 0xe6fed7f8
(kgdb) print bp-swbuf
$5 = 23
(kgdb) print nswbuf
$6 = 128
---
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