Date: Fri, 5 May 2000 15:35:30 +0200 (CEST) From: Thomas Faehnle <tf@wurbl.wn.bawue.de> To: grog@lemis.com Cc: freebsd-questions@freebsd.org Subject: Re: 4.0-RELEASE: vinum, fs, ATA trouble Message-ID: <E12niI6-0002m3-00@wurbl.bk.int> In-Reply-To: <20000505091209.D32650@freebie.lemis.com>
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On 5 May, grog@lemis.com wrote:
> [...]
>> But then, copying /usr/src to a filesystem with non-default block and
>> fragment size (32k/4k) yields the cp process hanging in "D+" state
>> after some 10s of megabytes. No vinum, no soft updates involved.
>
> More interesting than the D+ state is the WCHAN value returned by
> ps l.
Ok, I have a debugging kernel now. Doing
newfs -f 4096 -b 32768 /dev/ad2s2e
mount /dev/ad2s2e /t
cp -rv /usr/src/* /t
leaves the machine as shown below. I've included stack traces of all
processes on the "nbufkv" WCHAN.
marvin:/sys/compile/TFDBG# ps l
UID PID PPID CPU PRI NI VSZ RSS WCHAN STAT TT TIME COMMAND
[...]
0 4 0 0 -2 0 0 0 nbufkv DL ?? 0:00.13 (bufdaemon)
0 5 0 0 -2 0 0 0 nbufkv DL ?? 0:00.35 (syncer)
[...]
0 241 212 0 -2 0 372 200 nbufkv D+ v0 0:02.76 cp -rv /usr/
[...]
marvin:/sys/compile/TFDBG# gdb -k
GNU gdb 4.18
[...]
(kgdb) symbol-file kernel.debug
Reading symbols from kernel.debug...done.
(kgdb) exec-file kernel
(kgdb) core-file /dev/mem
IdlePTD 3203072
initial pcb at 2990000
panic messages:
---
---
#0 mi_switch () at ../../kern/kern_synch.c:859
859 if (switchtime.tv_sec == 0)
(kgdb) proc 241
(kgdb) bt
#0 mi_switch () at ../../kern/kern_synch.c:859
#1 0xc014fe81 in tsleep (ident=0xc02990bc, priority=20,
wmesg=0xc0256b68 "nbufkv", timo=0) at ../../kern/kern_synch.c:468
#2 0xc016fbd7 in getnewbuf (slpflag=0, slptimeo=0, size=4096, maxsize=32768)
at ../../kern/vfs_bio.c:1709
#3 0xc0170511 in getblk (vp=0xc63529a0, blkno=0, size=4096, slpflag=0,
slptimeo=0) at ../../kern/vfs_bio.c:2248
#4 0xc016e48a in bread (vp=0xc63529a0, blkno=0, size=4096, cred=0x0,
bpp=0xc62ebcf4) at ../../kern/vfs_bio.c:498
#5 0xc01f192b in ffs_blkatoff (vp=0xc63529a0, offset=0, res=0x0,
bpp=0xc62ebd74) at ../../ufs/ffs/ffs_subr.c:83
#6 0xc01f63b5 in ufs_lookup (ap=0xc62ebdc4) at ../../ufs/ufs/ufs_lookup.c:219
#7 0xc01fb155 in ufs_vnoperate (ap=0xc62ebdc4)
at ../../ufs/ufs/ufs_vnops.c:2283
#8 0xc0172079 in vfs_cache_lookup (ap=0xc62ebe18) at vnode_if.h:77
#9 0xc01fb155 in ufs_vnoperate (ap=0xc62ebe18)
at ../../ufs/ufs/ufs_vnops.c:2283
#10 0xc0174c58 in lookup (ndp=0xc62ebe94) at vnode_if.h:52
#11 0xc0174754 in namei (ndp=0xc62ebe94) at ../../kern/vfs_lookup.c:153
#12 0xc017a0d1 in stat (p=0xc5db7080, uap=0xc62ebf80)
at ../../kern/vfs_syscalls.c:1698
#13 0xc023939e in syscall (frame={tf_fs = 47, tf_es = 47, tf_ds = 47,
tf_edi = 134563645, tf_esi = 20, tf_ebp = -1077937864,
tf_isp = -970014764, tf_ebx = 134573354, tf_edx = 134573374, tf_ecx = 0,
tf_eax = 188, tf_trapno = 7, tf_err = 2, tf_eip = 134522652, tf_cs = 31,
tf_eflags = 643, tf_esp = -1077938020, tf_ss = 47})
at ../../i386/i386/trap.c:1073
#14 0xc022d8c6 in Xint0x80_syscall ()
#15 0x80484da in ?? ()
#16 0x80480f9 in ?? ()
(kgdb)
(kgdb) proc 4
(kgdb) bt
#0 mi_switch () at ../../kern/kern_synch.c:859
#1 0xc014fe81 in tsleep (ident=0xc02990bc, priority=20,
wmesg=0xc0256b68 "nbufkv", timo=0) at ../../kern/kern_synch.c:468
#2 0xc016fbd7 in getnewbuf (slpflag=0, slptimeo=0, size=4096, maxsize=65536)
at ../../kern/vfs_bio.c:1709
#3 0xc0170617 in geteblk (size=4096) at ../../kern/vfs_bio.c:2320
#4 0xc016e7a8 in bwrite (bp=0xc1c87bb0) at ../../kern/vfs_bio.c:641
#5 0xc0173c82 in vop_stdbwrite (ap=0xc5dc5f68) at ../../kern/vfs_default.c:319
#6 0xc0173add in vop_defaultop (ap=0xc5dc5f68) at ../../kern/vfs_default.c:138
#7 0xc01823e9 in spec_vnoperate (ap=0xc5dc5f68)
at ../../miscfs/specfs/spec_vnops.c:117
#8 0xc01fb185 in ufs_vnoperatespec (ap=0xc5dc5f68)
at ../../ufs/ufs/ufs_vnops.c:2301
#9 0xc016f802 in vfs_bio_awrite (bp=0xc1c87bb0) at vnode_if.h:1172
#10 0xc016ff9a in flushbufqueues () at ../../kern/vfs_bio.c:1913
#11 0xc016fd7b in buf_daemon () at ../../kern/vfs_bio.c:1833
#12 0xc022d8e0 in fork_trampoline ()
error reading /proc/4/mem
(kgdb)
(kgdb) proc 5
(kgdb) bt
#0 mi_switch () at ../../kern/kern_synch.c:859
#1 0xc014fe81 in tsleep (ident=0xc02990bc, priority=20,
wmesg=0xc0256b68 "nbufkv", timo=0) at ../../kern/kern_synch.c:468
#2 0xc016fbd7 in getnewbuf (slpflag=0, slptimeo=0, size=4096, maxsize=65536)
at ../../kern/vfs_bio.c:1709
#3 0xc0170617 in geteblk (size=4096) at ../../kern/vfs_bio.c:2320
#4 0xc016e7a8 in bwrite (bp=0xc1cb8048) at ../../kern/vfs_bio.c:641
#5 0xc0173c82 in vop_stdbwrite (ap=0xc5dc7f10) at ../../kern/vfs_default.c:319
#6 0xc0173add in vop_defaultop (ap=0xc5dc7f10) at ../../kern/vfs_default.c:138
#7 0xc01823e9 in spec_vnoperate (ap=0xc5dc7f10)
at ../../miscfs/specfs/spec_vnops.c:117
#8 0xc01fb185 in ufs_vnoperatespec (ap=0xc5dc7f10)
at ../../ufs/ufs/ufs_vnops.c:2301
#9 0xc016eba2 in bawrite (bp=0xc1cb8048) at vnode_if.h:1172
#10 0xc01f48e2 in ffs_fsync (ap=0xc5dc7f7c) at ../../ufs/ffs/ffs_vnops.c:198
#11 0xc0176203 in sched_sync () at vnode_if.h:537
#12 0xc022d8e0 in fork_trampoline ()
error reading /proc/5/mem
(kgdb)
Thomas
--
Thomas Faehnle, Am Sommerrain 12, D-71522 Backnang | MIME mail welcome
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