Hello,
I enjoy reading "A conversation with Jeff Bonwick and Bill Moore" in
ACM
Queue. PJD paper "Porting the ZFS file system to the FreeBSD operation
system" was really interesting... As a result, I switch all my
filesystems to zfs -- Yes I know: WARNING: ZFS is considered to be an
experimental feature in FreeBSD -- and it's quite stable for me.
Nevertheless I encouter a glitch *after* shutdown:
Kernel: 7.0-BETA1 - cvsup Oct 23 with patch
http://people.freebsd.org/~pjd/patches/vm_kern.c.2.patch.
Note: without this patch I get a kmem_map too small after some io load.
I setup my root fs under zfs. the boot fs is under gmirror+ufs.
loader.conf:
#--- Tuning for ZFS - http://wiki.freebsd.org/ZFSTuningGuide
vm.kmem_size="600M" # Size of kernel memory
vm.kmem_size_max="600M" # Max kmem size
vfs.zfs.debug="0" # ZFS - debug messages
vfs.zfs.prefetch_disable="1" # ZFS - disable prefetch
vfs.zfs.arc_max="128M" # ZFS - maximum ARC size :
128MB
#--- Mount root filesystem from ZFS
zfs_load="YES" # Load ZFS module
vfs.root.mountfrom="zfs:pool0" # Root filesystem is pool0
zpool status:
pool: pool0
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool0 ONLINE 0 0 0
mirror ONLINE 0 0 0
da0s2 ONLINE 0 0 0
da1s2 ONLINE 0 0 0
errors: No known data errors
pool: pool1
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool1 ONLINE 0 0 0
da0s3 ONLINE 0 0 0
da1s3 ONLINE 0 0 0
errors: No known data errors
pool: pool2
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
pool2 ONLINE 0 0 0
raidz1 ONLINE 0 0 0
ad4s3 ONLINE 0 0 0
ad6s3 ONLINE 0 0 0
errors: No known data errors
After shutdown I get a kernel trap:
[root@morzine MORZINE]# kgdb kernel.debug /var/crash/vmcore.20
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain
conditions.
Type "show copying" to see the conditions.
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details.
This GDB was configured as "i386-marcel-freebsd".
Unread portion of the kernel message buffer:
<118>Oct 28 09:58:48 morzine syslogd: exiting on signal 15
Waiting (max 60 seconds) for system process `vnlru' to stop...done
Waiting (max 60 seconds) for system process `bufdaemon' to stop...done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining...0 0 0 0 0 done
All buffers synced.
kernel trap 12 with interrupts disabled
Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x188
fault code = supervisor read, page not present
instruction pointer = 0x20:0xc0593425
stack pointer = 0x28:0xf668fa68
frame pointer = 0x28:0xf668fa80
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL 0, pres 1, def32 1, gran 1
processor eflags = resume, IOPL = 0
current process = 1 (init)
trap number = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper(c080a4a9,f668f944,c059f96f,c0825e2c,0,...) at
db_trace_self_wrapper+0x26
kdb_backtrace(c0825e2c,0,c07eebd8,f668f950,0,...) at kdb_backtrace+0x29
panic(c07eebd8,c08270e8,c5527f68,1,1,...) at panic+0x10f
trap_fatal(c0826fea,c,c588f000,f668f9c0,c5527d48,...) at trap_fatal+0x333
trap(f668fa28) at trap+0x11f
calltrap() at calltrap+0x6
--- trap 0xc, eip = 0xc0593425, esp = 0xf668fa68, ebp = 0xf668fa80 ---
_mtx_lock_sleep(c69d1a18,c5528440,0,0,0,...) at _mtx_lock_sleep+0x85
vrele(c69d1990,c5b80d0c,c5528440,c080eb5b,91f,...) at vrele+0x5b
vflush(c5b80d0c,1,2,c5528440,c5b5a844,...) at vflush+0x69b
zfs_umount(c5b80d0c,80000,c5528440,c5528440,c080e762,...) at zfs_umount+0xd5
dounmount(c5b80d0c,80000,c5528440,ead65aec,0,...) at dounmount+0x4ef
vfs_unmountall(c08083ac,0,c0808410,10e,f668fc50,...) at vfs_unmountall+0x33
boot(c5528440,8,0,fffffffe,c5528440,...) at boot+0x444
reboot(c5528440,f668fcfc,4,8048260,9e7c9054,...) at reboot+0x67
syscall(f668fd38) at syscall+0x335
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (55, FreeBSD ELF32, reboot), eip = 0x8050be3, esp =
0xbfbfe90c, ebp = 0xbfbfe9d8 ---
Uptime: 3d16h44m52s
Physical memory: 2030 MB
Dumping 468 MB: 453 437 421 405 389 373 357 341 325 309 293 277 261 245
229 213 197 181 165 149 133 117 101 85 69 53 37 21 5
#0 doadump () at pcpu.h:195
195 __asm __volatile("movl %%fs:0,%0" : "=r"
(td));
(kgdb)
Anyway, thanks for this great port
Henri