Date:	Mon, 22 Mar 2010 20:50:55 -0400
From:	Gene Heskett <gene.heskett@...izon.net>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: shutdown bugs, since about 2.6.31 or so

Greetings;

I do not know if I am miss-configured or what, and I hadn't worried about it 
extensively because the machine runs fine ANAICT.

But any reboot method short of just pressing the hdwe reset button generates 
quite a lengthy process of repeatedly pressing ctl-alt-del, minimum of 6 
times I believe, in order to actually do a shutdown, and this isn't at all 
graceful.  Not all of it makes it to the log, but here is what does.

Mar 22 16:47:53 coyote kernel: [ 3000.619173] BUG: Dentry d76beaa0{i=2,n=/} 
still in use (1) [unmount of cifs cifs]
Mar 22 16:47:53 coyote kernel: [ 3000.619191] ------------[ cut here 
]------------
Mar 22 16:47:53 coyote kernel: [ 3000.619303] kernel BUG at fs/dcache.c:676!
Mar 22 16:47:53 coyote kernel: [ 3000.619420] invalid opcode: 0000 [#1] 
PREEMPT SMP
Mar 22 16:47:53 coyote kernel: [ 3000.619597] last sysfs file: 
/sys/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/ATK0110:00/hwmon/hwmon0/in3_input
Mar 22 16:47:53 coyote kernel: [ 3000.619803] Modules linked in: nls_utf8 
cifs radeon ttm drm_kms_helper drm agpgart nfsd lockd nfs_acl auth_rpcgss 
expo
rtfs rfcomm sco bnep l2cap autofs4 sunrpc ipv6 or51132 snd_usb_audio 
snd_usb_lib cx88_dvb cx88_vp3054_i2c videobuf_dvb snd_emu10k1_synth 
snd_emux_synth
snd_seq_virmidi snd_seq_midi_emul dvb_core tuner_simple tuner_types tda9887 
tda8290 tuner snd_emu10k1 cx8800 cx8802 cx88xx snd_rawmidi snd_ac97_codec ac
97_bus snd_seq_dummy i2c_algo_bit snd_seq_oss snd_seq_midi_event snd_seq 
ftdi_sio btusb snd_pcm_oss snd_mixer_oss snd_pcm tveeprom bluetooth 
snd_seq_dev
ice snd_timer v4l2_common snd_page_alloc videodev snd_util_mem snd_hwdep 
v4l1_compat usbserial btcx_risc snd i2c_nforce2 sg k10temp firewire_ohci 
firewi
re_core rtc_cmos videobuf_dma_sg sr_mod cdrom pcspkr soundcore videobuf_core 
rtc_core crc_itu_t rfkill hwmon usblp joydev rtc_lib button evdev sd_mod ex
t3 jbd uhci_hcd ohci_hcd ehci_hcd [last unloaded: asus_atk0110]
Mar 22 16:47:53 coyote kernel: [ 3000.620117]
Mar 22 16:47:53 coyote kernel: [ 3000.620117] Pid: 5747, comm: umount.cifs 
Not tainted 2.6.34-rc2 #1 M2N-SLI DELUXE/System Product Name
Mar 22 16:47:53 coyote kernel: [ 3000.620117] EIP: 0060:[<c10946ae>] EFLAGS: 
00010246 CPU: 1
Mar 22 16:47:53 coyote kernel: [ 3000.620117] EIP is at 
shrink_dcache_for_umount_subtree+0x14b/0x1fe
Mar 22 16:47:53 coyote kernel: [ 3000.620117] EAX: 0000005b EBX: 00000001 
ECX: 00000046 EDX: 00000000
Mar 22 16:47:53 coyote kernel: [ 3000.620117] ESI: d76beaa0 EDI: d76beafc 
EBP: d55e6f24 ESP: d55e6ef4
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  DS: 007b ES: 007b FS: 00d8 GS: 
00e0 SS: 0068
Mar 22 16:47:53 coyote kernel: [ 3000.620117] Process umount.cifs (pid: 5747, 
ti=d55e6000 task=d55d8780 task.ti=d55e6000)
Mar 22 16:47:53 coyote kernel: [ 3000.620117] Stack:
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  c12d20ac d76beaa0 00000002 
d76beafc 00000001 fa14da01 dc956b64 fa14da01
Mar 22 16:47:53 coyote kernel: [ 3000.620117] <0> 0000001b dc956a00 fa14a7b4 
dc956a00 d55e6f30 c109478e dc956a00 d55e6f40
Mar 22 16:47:53 coyote kernel: [ 3000.620117] <0> c1087d38 00000013 fa158a5c 
d55e6f4c c1087e32 dc956a00 d55e6f5c c10883c6
Mar 22 16:47:53 coyote kernel: [ 3000.620117] Call Trace:
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c109478e>] ? 
shrink_dcache_for_umount+0x2d/0x37
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c1087d38>] ? 
generic_shutdown_super+0x15/0xd2
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c1087e32>] ? 
kill_anon_super+0xc/0x43
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c10883c6>] ? 
deactivate_super+0x39/0x4b
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c1098dfd>] ? 
mntput_no_expire+0x8c/0xbb
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c10992df>] ? 
sys_umount+0x299/0x2be
Mar 22 16:47:53 coyote kernel: [ 3000.620117]  [<c1002813>] ? 
sysenter_do_call+0x12/0x22
Mar 22 16:47:53 coyote kernel: [ 3000.620117] Code: 00 89 45 ec 8b 46 10 8b 
1e 8b 7e 28 85 c0 74 03 8b 50 20 8d 81 64 01 00 00 50 ff 75 ec 53 57 52 56 6
8 ac 20 2d c1 e8 b5 fc 1b 00 <0f> 0b 83 c4 1c eb fe 8b 7e 1c 39 fe 75 04 31 
ff eb 03 f0 ff 0f
Mar 22 16:47:53 coyote kernel: [ 3000.620117] EIP: [<c10946ae>] 
shrink_dcache_for_umount_subtree+0x14b/0x1fe SS:ESP 0068:d55e6ef4
Mar 22 16:47:53 coyote kernel: [ 3000.627952] ---[ end trace fbecccbb5fac2d05 
]---

Now, after this point, I have to press ctl-alt-del at least 2 times to get it 
to continue the shutdown, it will timeout 3 times trying to umount /usr, and 
then finally squawk about a cifs mount that is done in my rc.local file.  
That requires 2 more presses of the ctl-alt-del keys, then it finally says 
its shutting down, and 20 to 30 seconds later I have to press them again 
before it actually reverts to the bios to begin the next boot anew.

I have seen this fs/dcache.c line 676 mentioned many times here, and I would 
have thought by now this nuisance would have been spanked.

Thanks.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)

Captain's Log, star date 21:34.5...
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