Re: [linux-cifs-client] shutdown bugs, since about 2.6.31 or so

[Jeff Layton <jlayton@samba.org>]

On Tue, 23 Mar 2010 09:59:57 +0530
Suresh Jayaraman <sjayaraman@suse.de> wrote:

> Ccing linux-cifs-client@lists.samba.org where most of the cifs
> development happens.
> 
> On 03/23/2010 06:20 AM, Gene Heskett wrote:
> > 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.
> > 
> 
> 

Looks like the same bug as reported here:

http://lists.samba.org/archive/linux-cifs-client/2010-February/005560.html

...the patch I asked them to test is now here:

http://git.samba.org/?p=jlayton/linux.git;a=commit;h=fd0ab22278f38b0e2b7d303a1101b15d3255aee9

...but I still think the problem is likely in how we autodisable server
inode numbers. A way to reproduce this problem would be very helpful.

-- 
Jeff Layton <jlayton@samba.org>