Date:	Mon, 4 May 2009 06:26:34 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	dm-devel@...hat.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: dm-multipath completely breaks AHCI driver

On Monday 04 of May 2009 00:43:01 Robert Hancock wrote:
> Andrey Borzenkov wrote:
> > Yeah, me knows - it does sound weird.
> >
> > I moved my system from to different notebook (it was pure rsync +
> > mkinitrd + couple of adjustments in loaded modules). Older one was
> > using pata_ali, new one is using AHCI (Intel ICH8).
> >
> > After booting it (using *the* *same* kernel, only different
> > modules) for the first time I started to get random oopses, file
> > system corruptions as well as scary HSM violations in logs.
> >
> > Ubuntu live CD had no issues (even with relatively high IO load
> > during kernel compilation); also my son used this notebook for
> > several months under ArchLinux without any issues either.
> >
> > I compiled minimal stripped down kernel which worked. I tried to
> > compile more feature reach one - and immediately got HSM
> > violations. This time I noticed that "bad" one had dm-multipath and
> > "good" one not ... well, removing /etc/mutipath.conf (to block
> > loading of it) - and lo and behold! I am running without any issues
> > ...
> >
> > So what I got in logs was:
> >
> > [   18.593217] device-mapper: uevent: version 1.0.3
> > [   18.593873] device-mapper: ioctl: 4.14.0-ioctl (2008-04-23)
> > initialised: dm-devel@...hat.com
> > [   18.664812] device-mapper: multipath: version 1.0.5 loaded
> > [   19.070383] ata1.00: exception Emask 0x2 SAct 0x73 SErr
> > 0x3000400 action 0x6
> > [   19.070389] ata1.00: irq_stat 0x45000008
> > [   19.070395] ata1: SError: { Proto TrStaTrns UnrecFIS }
> > [   19.070406] ata1.00: cmd 60/08:00:e2:e5:c3/00:00:01:00:00/40 tag
> > 0 ncq 4096 in
> > [   19.070409]          res 40/00:38:00:00:00/00:00:00:00:00/40
> > Emask 0x2 (HSM violation)
> > [   19.070414] ata1.00: status: { DRDY }
> > [   19.070424] ata1.00: cmd 60/40:08:12:60:40/00:00:01:00:00/40 tag
> > 1 ncq 32768 in
> > [   19.070426]          res 40/00:38:00:00:00/00:00:00:00:00/40
> > Emask 0x2 (HSM violation)
> > [   19.070431] ata1.00: status: { DRDY }
> > [   19.070442] ata1.00: cmd 60/18:20:42:c1:c4/00:00:01:00:00/40 tag
> > 4 ncq 12288 in
> > [   19.070444]          res 41/84:18:59:c1:c4/03:00:01:00:00/61
> > Emask 0x412 (ATA bus error) <F>
> > [   19.070453] ata1.00: status: { DRDY ERR }
> > [   19.070455] ata1.00: error: { ICRC ABRT }
> > [   19.070460] ata1.00: cmd 60/28:28:22:c3:c4/00:00:01:00:00/40 tag
> > 5 ncq 20480 in
> > [   19.070461]          res 40/00:38:00:00:00/00:00:00:00:00/40
> > Emask 0x2 (HSM violation)
> > [   19.070464] ata1.00: status: { DRDY }
> > [   19.070469] ata1.00: cmd 60/80:30:c2:c3:c4/02:00:01:00:00/40 tag
> > 6 ncq 327680 in
> > [   19.070470]          res 40/00:38:00:00:00/00:00:00:00:00/40
> > Emask 0x2 (HSM violation)
> > [   19.070473] ata1.00: status: { DRDY }
> > [   19.070479] ata1: hard resetting link
> > [   19.420110] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl
> > 300) [   19.485363] ata1.00: configured for UDMA/100
> > [   19.485406] ata1: EH complete
>
> It seems really unlikely that dm-multipath could have this kind of
> effect.

I could hardly beieve it myself.

> This really looks like a hardware problem of some type, as
> the controller is seeing errors on the SATA link and the drive is
> complaining about bad CRCs. Maybe whatever you were doing was
> stressing something more than usual?
>

I was booting :) Nothing more.

> > [   19.586193] device-mapper: multipath round-robin: version 1.0.0
> > loaded
> > [   19.586634] device-mapper: table: 254:0: multipath: error
> > getting device
> > [   19.586638] device-mapper: ioctl: error adding target to table
> > [   31.932088] REISERFS (device sda7): found reiserfs format "3.6"
> > with standard journal
> > [   31.932111] REISERFS (device sda7): using ordered data mode
> > [   31.932289] REISERFS (device sda7): journal params: device sda7,
> > size 8192, journal first block 18, max trans len 1024, max batch
> > 900, max commit age 30, max trans age 30
> > [   31.932559] REISERFS (device sda7): checking transaction log
> > (sda7) [   31.999527] REISERFS (device sda7): Using r5 hash to sort
> > names [   32.101614] loop: module loaded
> > [   32.581870] Adding 4192924k swap on /dev/sda5.  Priority:-1
> > extents:1 across:4192924k
> > [   34.671257] iwl3945 0000:0c:00.0: firmware: requesting
> > iwlwifi-3945-2.ucode
> > [   34.924834] iwl3945 0000:0c:00.0: loaded firmware version
> > 15.28.2.8 [   34.941614] BUG: unable to handle kernel paging
> > request at 08048154 [   34.949359] IP: [<c0284711>]
> > kmem_cache_alloc+0xa8/0xc1 [   34.949359] *pde = 7f4b8067
> > [   34.949359] Oops: 0003 [#1] SMP
> > [   34.949359] last sysfs file:
> > /sys/devices/virtual/dmi/id/board_serial [   34.949359] Modules
> > linked in: loop ext2 mbcache dm_mirror dm_region_hash dm_log
> > dm_round_robin dm_multipath dm_mod
> > snd_hda_codec_idt iwl3945 snd_hda_intel snd_hda_codec iwlcore
> > snd_hwdep btusb uvcvideo bluetooth snd_pcm videodev sdhci_pci
> > ohci1394 snd_page_alloc sdhci v4l1_compat iTCO_wdt ieee1394
> > lib80211 mmc_core dcdbas ricoh_mmc hid ata_piix ahci libata
> > reiserfs
> > [   34.949359]
> > [   34.949359] Pid: 2151, comm: hald Tainted: G        W  (2.6.30-
> > rc4-3avb #5) XPS M1330
> > [   34.949359] EIP: 0060:[<c0284711>] EFLAGS: 00010246 CPU: 1
> > [   34.949359] EIP is at kmem_cache_alloc+0xa8/0xc1
> > [   34.949359] EAX: 00000000 EBX: 08048154 ECX: 00000025 EDX:
> > 00000094 [   34.949359] ESI: 00008050 EDI: 08048154 EBP: f5a26f2c
> > ESP: f5a26f14 [   34.949359]  DS: 007b ES: 007b FS: 00d8 GS: 0033
> > SS: 0068 [   34.949359] Process hald (pid: 2151, ti=f5a26000
> > task=f5aabe30 task.ti=f5a26000)
> > [   34.949359] Stack:
> > [   34.949359]  f7001000 c02eb6d5 00000094 f6601260 f5a21d80
> > 00008050 f5a26f44 c02eb6d5
> > [   34.949359]  f5a21d90 f5a21d80 f71e4dec f71e4e08 f5a26f58
> > c02a9b43 f6f71eec f71e4dec
> > [   34.949359]  f5a21d80 f5a26f7c c02a9c6c f6f72100 f5a21db4
> > ffffffea c02aa7d6 fffffff4
> > [   34.949359] Call Trace:
> > [   34.949359]  [<c02eb6d5>] ? idr_pre_get+0x27/0x60
> > [   34.949359]  [<c02eb6d5>] ? idr_pre_get+0x27/0x60
> > [   34.949359]  [<c02a9b43>] ? inotify_handle_get_wd+0x19/0x54
> > [   34.949359]  [<c02a9c6c>] ? inotify_add_watch+0x4d/0xe1
> > [   34.949359]  [<c02aa7d6>] ? sys_inotify_add_watch+0xbb/0x16c
> > [   34.949359]  [<c02aa815>] ? sys_inotify_add_watch+0xfa/0x16c
> > [   34.949359]  [<c02029d4>] ? sysenter_do_call+0x12/0x32
> > [   34.949359] Code: 02 00 00 75 09 57 9d e8 60 ca fb ff eb 07 e8
> > d1 de fb ff 57 9d 66 85 f6 79 20 85 db 74 1c 8b 4d f0 89 df c1 e9
> > 02 31 c0 8b 55 f0 <f3> ab f6 c2 02 74 02 66 ab f6 c2 01 74 01 aa 8d
> > 65 f4 89 d8 5b [   34.949359] EIP: [<c0284711>]
> > kmem_cache_alloc+0xa8/0xc1 SS:ESP 0068:f5a26f14
> > [   34.949359] CR2: 0000000008048154
> > [   35.262159] ---[ end trace a499c68e391b7f63 ]---
> > [   35.272994] Registered led device: iwl-phy0::radio
> > [   35.282572] Registered led device: iwl-phy0::assoc
> > [   35.292096] Registered led device: iwl-phy0::RX
> > [   35.302859] Registered led device: iwl-phy0::TX
> > [   35.317633] BUG: unable to handle kernel paging request at
> > 62696c2f [   35.327346] IP: [<c02846c7>] kmem_cache_alloc+0x5e/0xc1
> > [   35.327561] *pde = 00000000
> > [   35.327561] Oops: 0000 [#2] SMP
> > [   35.327561] last sysfs file:
> > /sys/devices/virtual/dmi/id/board_serial [   35.327561] Modules
> > linked in: loop ext2 mbcache dm_mirror dm_region_hash dm_log
> > dm_round_robin dm_multipath dm_mod
> > snd_hda_codec_idt iwl3945 snd_hda_intel snd_hda_codec iwlcore
> > snd_hwdep btusb uvcvideo bluetooth snd_pcm videodev sdhci_pci
> > ohci1394 snd_page_alloc sdhci v4l1_compat iTCO_wdt ieee1394
> > lib80211 mmc_core dcdbas ricoh_mmc hid ata_piix ahci libata
> > reiserfs
> > [   35.327561]
> > [   35.327561] Pid: 2267, comm: console-kit-dae Tainted: G      D W
> > (2.6.30-rc4-3avb #5) XPS M1330
> > [   35.327561] EIP: 0060:[<c02846c7>] EFLAGS: 00010002 CPU: 1
> > [   35.327561] EIP is at kmem_cache_alloc+0x5e/0xc1
> > [   35.327561] EAX: 00000000 EBX: 62696c2f ECX: f7001000 EDX:
> > c22b34bc [   35.327561] ESI: 00008050 EDI: 00000246 EBP: f5a5cf2c
> > ESP: f5a5cf14 [   35.327561]  DS: 007b ES: 007b FS: 00d8 GS: 0033
> > SS: 0068 [   35.327561] Process console-kit-dae (pid: 2267,
> > ti=f5a5c000 task=f59fa550 task.ti=f5a5c000)
> > [   35.327561] Stack:
> > [   35.327561]  f7001000 c02eb6d5 00000094 f67fe0c0 f67fe0c0
> > 00008050 f5a5cf44 c02eb6d5
> > [   35.327561]  f67fe0d0 f67fe0c0 f71e4cd4 f71e4cf0 f5a5cf58
> > c02a9b43 f6f7259c f71e4cd4
> > [   35.327561]  f67fe0c0 f5a5cf7c c02a9c6c f6f727b0 f67fe0f4
> > ffffffea c02aa7d6 fffffff4
> > [   35.327561] Call Trace:
> > [   35.327561]  [<c02eb6d5>] ? idr_pre_get+0x27/0x60
> > [   35.327561]  [<c02eb6d5>] ? idr_pre_get+0x27/0x60
> > [   35.327561]  [<c02a9b43>] ? inotify_handle_get_wd+0x19/0x54
> > [   35.327561]  [<c02a9c6c>] ? inotify_add_watch+0x4d/0xe1
> > [   35.327561]  [<c02aa7d6>] ? sys_inotify_add_watch+0xbb/0x16c
> > [   35.327561]  [<c02aa815>] ? sys_inotify_add_watch+0xfa/0x16c
> > [   35.327561]  [<c02029d4>] ? sysenter_do_call+0x12/0x32
> > [   35.327561] Code: 62 f5 21 00 9c 5f fa e8 aa ca fb ff 8b 4d e8
> > 64 a1 88 d4 66 c0 8b 94 81 a4 00 00 00 8b 42 10 89 45 f0 8b 1a 85
> > db 74 0a 8b 42 0c <8b> 04 83 89 02 eb 15 52 83 c9 ff 89 f2 ff 75 ec
> > 8b 45 e8 e8 4d [   35.327561] EIP: [<c02846c7>]
> > kmem_cache_alloc+0x5e/0xc1 SS:ESP 0068:f5a5cf14
> > [   35.327561] CR2: 0000000062696c2f
> > [   35.327561] ---[ end trace a499c68e391b7f64 ]---
> > [   35.693405] ADDRCONF(NETDEV_UP): wlan0: link is not ready
> >
> > The contents of /etc/mutipath.conf was:
> >
> > defaults {
> > 	getuid_callout	"/bin/echo -n 12345678"
> > 	path_checker	readsector0
> > }
> > multipaths {
> > 	multipath {
> > 		wwid		12345678
> > 		features	"1 queue_if_no_path"
> > 		no_path_retry	5
> > 		failback	immediate
> > 	}
> > }
> >
> > I was experimenting with multipath-over-loop and completely forgot
> > about it later.
> >
> > I understand that it sounds more like "doctor, it hurts when I stab
> > myself in the eye". Still, even with this absolutely weird config
> > result is rather unexpected (what is worse, it is near to
> > impossible to find out the reason; I did it by pure accident). Also
> > I have been running with *exactly* the same config for almost a
> > year without any ill effects at all.
> >
> > I am ready to offer debugging aid if required.


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