Ganbold wrote:> #3 0xc06ab8b3 in vput (vp=0xc3d11ac8) at
> /usr/src/sys/kern/vfs_subr.c:2202
> #4 0xc06a69e6 in dounmount (mp=0xc3e59b30, flags=524288,
> td=0xc3b31d20) at /usr/src/sys/kern/vfs_mount.c:1288
> #5 0xc06aa493 in vfs_unmountall () at /usr/src/sys/kern/vfs_subr.c:2939
> #6 0xc062b7f4 in boot (howto=16392) at
> /usr/src/sys/kern/kern_shutdown.c:400
> #7 0xc062bc17 in reboot (td=0xc3b31d20, uap=0xeef55cfc) at
> /usr/src/sys/kern/kern_shutdown.c:172
> #8 0xc08171f5 in syscall (frame=0xeef55d38) at
> /usr/src/sys/i386/i386/trap.c:1090
> #9 0xc07fd710 in Xint0x80_syscall () at
> /usr/src/sys/i386/i386/exception.s:255
> #10 0x00000033 in ?? ()
> (kgdb)
> ..
I was able to reproduce the panic. I plugged in external ZFS/GELI HDD
via USB
and used 'zpool import' to import disk and did some 'ls' and
then used
'zpool export' to umount disk.
Then I detached the disk from desktop and tried to "shutdown -p now".
This way panic is
reproduced 2 times.
More info:
daemon% uname -an
FreeBSD daemon.micom.mng.net 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #8
r185085M: Thu Nov 20 12:50:33 ULAT 2008
tsgan@daemon.micom.mng.net:/usr/obj/usr/src/sys/GDAEMON i386
daemon%
<118>.
<118>Writing entropy file:
<118>.
<118>Terminated
<118>.
<118>Nov 20 14:30:12 daemon syslogd: exiting on signal 15
rootvp 0xc3d11ac8 v_usecount 2
KDB: stack backtrace:
db_trace_self_wrapper(c086b1ee,f2c6bbac,c06abb23,c086faa8,c3d11ac8,...)
at db_trace_self_wrapper+0x26
kdb_backtrace(c086faa8,c3d11ac8,2,b,0,...) at kdb_backtrace+0x29
vrele(c3d11ac8,c3e6f690,0,0,0,...) at vrele+0x83
fdfree(c3e6f690,c3e8f000,48077bf0,f2c6bc80,c062ccfe,...) at fdfree+0x8b6
exit1(c3e6f690,0,f2c6bd2c,c0817245,c3e6f690,...) at exit1+0x5e9
sys_exit(c3e6f690,f2c6bcfc,4,c3e6f690,f2c6bd2c,...) at sys_exit+0x1d
syscall(f2c6bd38) at syscall+0x335
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x4810ed2f, esp =
0xbfbfe6bc, ebp = 0xbfbfe6c8 ---
rootvp 0xc3d11ac8 v_usecount 1
KDB: stack backtrace:
db_trace_self_wrapper(c086b1ee,f2c6bbac,c06abb23,c086faa8,c3d11ac8,...)
at db_trace_self_wrapper+0x26
kdb_backtrace(c086faa8,c3d11ac8,1,b,0,...) at kdb_backtrace+0x29
vrele(c3d11ac8,c3e6f690,0,0,0,...) at vrele+0x83
fdfree(c3e6f690,c3e8f000,48077bf0,f2c6bc80,c062ccfe,...) at fdfree+0x8c3
exit1(c3e6f690,0,f2c6bd2c,c0817245,c3e6f690,...) at exit1+0x5e9
sys_exit(c3e6f690,f2c6bcfc,4,c3e6f690,f2c6bd2c,...) at sys_exit+0x1d
syscall(f2c6bd38) at syscall+0x335
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (1, FreeBSD ELF32, sys_exit), eip = 0x4810ed2f, esp =
0xbfbfe6bc, ebp = 0xbfbfe6c8 ---
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...2 1 0 0 done
All buffers synced.
rootvp 0xc3d11ac8 v_usecount 1
KDB: stack backtrace:
db_trace_self_wrapper(c086b1ee,eef55ba8,c06abb23,c086faa8,c3d11ac8,...)
at db_trace_self_wrapper+0x26
kdb_backtrace(c086faa8,c3d11ac8,1,c3b31d20,eef55ba8,...) at
kdb_backtrace+0x29
vrele(c3d11ac8,2,eef55bf0,c3b31d20,0,...) at vrele+0x83
dounmount(c3e56b30,80000,c3b31d20,e3b61aec,0,...) at dounmount+0x491
vfs_unmountall(c0869007,0,c086906b,117,eef55c50,...) at vfs_unmountall+0x33
boot(c3b31d20,8,0,fffffffe,c3b31d20,...) at boot+0x444
reboot(c3b31d20,eef55cfc,4,8048290,9e7c9054,...) at reboot+0x67
syscall(eef55d38) at syscall+0x335
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (55, FreeBSD ELF32, reboot), eip = 0x8050bb3, esp =
0xbfbfe8ec, ebp = 0xbfbfe9b8 ---
panic: vput: negative ref cnt
cpuid = 0
KDB: stack backtrace:
db_trace_self_wrapper(c086b1ee,eef55b68,c062bd39,c08832ea,0,...) at
db_trace_self_wrapper+0x26
kdb_backtrace(c08832ea,0,c086fac1,eef55b74,0,...) at kdb_backtrace+0x29
panic(c086fac1,eef55ba8,c06abcd0,c3d11ac8,eef55b90,...) at panic+0x119
vput(c3d11ac8,2,eef55bf0,c3b31d20,0,...) at vput+0xf3
dounmount(c3e56b30,80000,c3b31d20,e3b61aec,0,...) at dounmount+0x4a6
vfs_unmountall(c0869007,0,c086906b,117,eef55c50,...) at vfs_unmountall+0x33
boot(c3b31d20,8,0,fffffffe,c3b31d20,...) at boot+0x444
reboot(c3b31d20,eef55cfc,4,8048290,9e7c9054,...) at reboot+0x67
syscall(eef55d38) at syscall+0x335
Xint0x80_syscall() at Xint0x80_syscall+0x20
--- syscall (55, FreeBSD ELF32, reboot), eip = 0x8050bb3, esp =
0xbfbfe8ec, ebp = 0xbfbfe9b8 ---
Uptime: 7m3s
Physical memory: 1013 MB
Dumping 54 MB: 39 23 7
(kgdb) where
#0 doadump () at pcpu.h:196
#1 0xc062ba67 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:418
#2 0xc062bd72 in panic (fmt=Variable "fmt" is not available.
) at /usr/src/sys/kern/kern_shutdown.c:574
#3 0xc06ab8e3 in vput (vp=0xc3d11ac8) at /usr/src/sys/kern/vfs_subr.c:2211
#4 0xc06a69e6 in dounmount (mp=0xc3e56b30, flags=524288, td=0xc3b31d20)
at /usr/src/sys/kern/vfs_mount.c:1288
#5 0xc06aa493 in vfs_unmountall () at /usr/src/sys/kern/vfs_subr.c:2948
#6 0xc062b7f4 in boot (howto=16392) at
/usr/src/sys/kern/kern_shutdown.c:400
#7 0xc062bc17 in reboot (td=0xc3b31d20, uap=0xeef55cfc) at
/usr/src/sys/kern/kern_shutdown.c:172
#8 0xc0817245 in syscall (frame=0xeef55d38) at
/usr/src/sys/i386/i386/trap.c:1090
#9 0xc07fd760 in Xint0x80_syscall () at
/usr/src/sys/i386/i386/exception.s:255
#10 0x00000033 in ?? ()
(kgdb) frame 4
#4 0xc06a69e6 in dounmount (mp=0xc3e56b30, flags=524288, td=0xc3b31d20)
at /usr/src/sys/kern/vfs_mount.c:1288
1288 vput(fsrootvp);
(kgdb) p *mp
$1 = {mnt_lock = {lk_object = {lo_name = 0xc086f234 "vfslock", lo_type
=
0xc086f234 "vfslock", lo_flags = 70844416, lo_witness_data = {lod_list
= {
stqe_next = 0x0}, lod_witness = 0x0}}, lk_interlock =
0xc0956fa8, lk_flags = 1310720, lk_sharecount = 0, lk_waitcount = 0,
lk_exclusivecount = 1,
lk_prio = 80, lk_timo = 0, lk_lockholder = 0xc3b31d20, lk_newlock =
0x0}, mnt_mtx = {lock_object = {lo_name = 0xc086f223 "struct mount
mtx",
lo_type = 0xc086f223 "struct mount mtx", lo_flags = 16973824,
lo_witness_data = {lod_list = {stqe_next = 0x0}, lod_witness = 0x0}},
mtx_lock = 4,
mtx_recurse = 0}, mnt_gen = 1, mnt_list = {tqe_next = 0x0, tqe_prev
= 0xc091c224}, mnt_op = 0xc0926080, mnt_vfc = 0xc0926040,
mnt_vnodecovered = 0x0,
mnt_syncer = 0x0, mnt_ref = 736, mnt_nvnodelist = {tqh_first =
0xc3d11ac8, tqh_last = 0xc67fd350}, mnt_nvnodelistsize = 736,
mnt_writeopcount = 1,
mnt_kern_flag = 553648137, mnt_flag = 20480, mnt_noasync = 0, mnt_opt
= 0xc3c4cc90, mnt_optnew = 0x0, mnt_maxsymlinklen = 120, mnt_stat = {
f_version = 537068824, f_type = 1, f_flags = 20480, f_bsize = 2048,
f_iosize = 16384, f_blocks = 2538519, f_bfree = 2339932, f_bavail =
2136851,
f_files = 659454, f_ffree = 651413, f_syncwrites = 0, f_asyncwrites
= 0, f_syncreads = 0, f_asyncreads = 0, f_spare = {0, 0, 0, 0, 0, 0, 0,
0, 0, 0},
f_namemax = 255, f_owner = 0, f_fsid = {val = {1149777033,
1944990175}}, f_charspare = '\0' <repeats 79 times>,
f_fstypename = "ufs", '\0' <repeats 12 times>,
f_mntfromname =
"/dev/ad4s1a", '\0' <repeats 76 times>, f_mntonname =
"/", '\0' <repeats
86 times>},
mnt_cred = 0xc3e52700, mnt_data = 0xc3e52600, mnt_time = 1227162073,
mnt_iosize_max = 131072, mnt_export = 0x0, mnt_label = 0x0,
mnt_hashseed = 2358371174, mnt_markercnt = 0, mnt_holdcnt = 0,
mnt_holdcntwaiters = 0, mnt_secondary_writes = 0,
mnt_secondary_accwrites = 2874,
mnt_gjprovider = 0x0, mnt_explock = {lk_object = {lo_name = 0xc086f23c
"explock", lo_type = 0xc086f23c "explock", lo_flags =
70844416,
lo_witness_data = {
lod_list = {stqe_next = 0x0}, lod_witness = 0x0}}, lk_interlock
= 0xc0956fc0, lk_flags = 0, lk_sharecount = 0, lk_waitcount = 0,
lk_exclusivecount = 0, lk_prio = 80, lk_timo = 0, lk_lockholder =
0xffffffff, lk_newlock = 0x0}}
(kgdb) p fsrootvp
$2 = (struct vnode *) 0xc3d11ac8
(kgdb) p *fsrootvp
$3 = {v_type = VDIR, v_tag = 0xc0864e51 "ufs", v_op = 0xc0926280,
v_data
= 0xc3e5d000, v_mount = 0xc3e56b30, v_nmntvnodes = {tqe_next = 0xc3d119b4,
tqe_prev = 0xc3e56b98}, v_un = {vu_mount = 0x0, vu_socket = 0x0,
vu_cdev = 0x0, vu_fifoinfo = 0x0, vu_yield = 0}, v_hashlist = {le_next =
0x0,
le_prev = 0xc3d09da0}, v_hash = 2, v_cache_src = {lh_first = 0x0},
v_cache_dst = {tqh_first = 0x0, tqh_last = 0xc3d11af8}, v_dd = 0x0,
v_cstart = 0,
v_lasta = 0, v_lastw = 0, v_clen = 0, v_lock = {lk_object = {lo_name =
0xc0864e51 "ufs", lo_type = 0xc0864e51 "ufs", lo_flags =
70844416,
lo_witness_data = {lod_list = {stqe_next = 0x0}, lod_witness =
0x0}}, lk_interlock = 0xc0956510, lk_flags = 262208, lk_sharecount = 0,
lk_waitcount = 0, lk_exclusivecount = 1, lk_prio = 80, lk_timo = 51,
lk_lockholder = 0xc3b31d20, lk_newlock = 0x0}, v_interlock =
{lock_object = {
lo_name = 0xc086fb51 "vnode interlock", lo_type = 0xc086fb51
"vnode interlock", lo_flags = 16973824, lo_witness_data = {lod_list =
{stqe_next = 0x0},
lod_witness = 0x0}}, mtx_lock = 3283295520, mtx_recurse = 0},
v_vnlock = 0xc3d11b20, v_holdcnt = 2, v_usecount = 0, v_iflag = 0,
v_vflag = 1,
v_writecount = 0, v_freelist = {tqe_next = 0x0, tqe_prev = 0x0},
v_bufobj = {bo_mtx = 0xc3d11b50, bo_clean = {bv_hd = {tqh_first =
0xe3d02594,
tqh_last = 0xe3d025cc}, bv_root = 0xe3d02594, bv_cnt = 1},
bo_dirty = {bv_hd = {tqh_first = 0x0, tqh_last = 0xc3d11b9c}, bv_root =
0x0,
bv_cnt = 0}, bo_numoutput = 0, bo_flag = 0, bo_ops = 0xc091ae00,
bo_bsize = 16384, bo_object = 0xc106183c, bo_synclist = {le_next = 0x0,
le_prev = 0x0}, bo_private = 0xc3d11ac8, __bo_vnode = 0xc3d11ac8},
v_pollinfo = 0x0, v_label = 0x0, v_lockf = 0x0}
(kgdb) p rootvnode
$4 = (struct vnode *) 0x0
(kgdb) p *rootvnode
Cannot access memory at address 0x0
(kgdb)
--
They are called computers simply because computation is the only
significant job that has so far been given to them.