Hi,
When attempting to change raid level from 1 to 0 (I was doing some testing
trying to convert a raid1 array to a raid10 one), I got a division error.
I'm on Debian sid, output of uname -a is:
Linux gbl-macbook 3.2.0-4-amd64 #1 SMP Debian 3.2.35-2 x86_64 GNU/Linux
I had the following raid set up (using devices on LVM):
gbl-macbook# cat /proc/mdstat
Personalities : [raid1] [raid0] [raid10]
md0 : active raid1 md1[2] md2[1]
409280 blocks super 1.2 [2/2] [UU]
md2 : active raid0 dm-8[1] dm-7[0]
1022976 blocks super 1.2 512k chunks
md1 : active raid0 dm-6[1] dm-5[0]
1022976 blocks super 1.2 512k chunks
unused devices: <none>
/dev/md0 was a mounted ext4 filesystem.
I attempted to run this:
gbl-macbook# mdadm --grow /dev/md0 -l 0
zsh: segmentation fault mdadm --grow /dev/md0 -l 0
gbl-macbook#
All my terminals have shown the following alert:
Message from syslogd@gbl-macbook at May 23 11:26:11 ...
kernel:[569106.802042] divide error: 0000 [#1] SMP
Message from syslogd@gbl-macbook at May 23 11:26:11 ...
kernel:[569106.802393] Stack:
Message from syslogd@gbl-macbook at May 23 11:26:11 ...
kernel:[569106.802430] Call Trace:
Message from syslogd@gbl-macbook at May 23 11:26:11 ...
kernel:[569106.802519] Code: 4c 24 18 49 8b 6c 24 18 48 89 4c 24 18 eb 6b 48 8b 7d 30 48 8d 74 24 38 e8 d4 16 af e0 49 63 8c 24 bc 00 00 00 48 8b 45 10 31 d2 <48> f7 f1 48 0f af c1 48 89 45 10 4d 8b 6c 24 18 eb 2f 49 8b 7d
Here's the relevant output from dmesg:
[569106.729859] RAID1 conf printout:
[569106.729870] --- wd:1 rd:2
[569106.729878] disk 0, wo:0, o:1, dev:md1
[569106.734368] md: unbind<md2>
[569106.795283] md: export_rdev(md2)
[569106.802042] divide error: 0000 [#1] SMP
[569106.802053] CPU 0
[569106.802057] Modules linked in: raid10 raid0 ext4 jbd2 mbcache raid1 md_mod b43 bcma asix usbnet mii nls_cp437 vfat fat nls_utf8 hfsplus usb_storage cdc_acm snd_usb_audio snd_usbmidi_lib ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables parport_pc ppdev lp parport rfcomm bnep pci_stub cpufreq_stats vboxpci(O) cpufreq_userspace cpufreq_powersave cpufreq_conservative vboxnetadp(O) vboxnetflt(O) vboxdrv(O) binfmt_misc uinput nfsd nfs nfs_acl auth_rpcgss fscache lockd sunrpc loop firewire_sbp2 fuse kvm_intel kvm uvcvideo videodev v4l2_compat_ioctl32 media snd_hda_codec_hdmi btusb bluetooth crc16 bcm5974 snd_hda_codec_cirrus joydev snd_hda_intel snd_hda_codec snd_pcm_oss snd_hwdep snd_mixer_oss snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi arc4 snd_seq snd_seq_device snd_timer coretemp mac80211 cfg80211 rfkill ssb rng_core applesmc pcmcia i2c_i801 pcmcia_core crc32c_intel snd iTCO_wdt acpi_cpufreq soundcore ghash_clmulni_intel aesni_intel aes_x86_64 aes_generic evdev i2c_core iTCO_vendor_support mperf cryptd input_polldev pcspkr fglrx(P) battery video ac apple_bl(O) button processor power_supply thermal_sys xfs hid_microsoft dm_mod sg sr_mod sd_mod cdrom crc_t10dif ata_generic hid_apple usbhid hid uhci_hcd ata_piix libata firewire_ohci scsi_mod firewire_core crc_itu_t sdhci_pci ehci_hcd sdhci mmc_core tg3 usbcore libphy usb_common [last unloaded: bcma]
[569106.802283]
[569106.802290] Pid: 30710, comm: mdadm Tainted: P O 3.2.0-4-amd64 #1 Debian 3.2.35-2 Apple Inc. MacBookPro8,2/Mac-94245A3940C91C80
[569106.802302] RIP: 0010:[<ffffffffa065745b>] [<ffffffffa065745b>] create_strip_zones+0x71/0x491 [raid0]
[569106.802320] RSP: 0018:ffff8801a8a77d48 EFLAGS: 00010246
[569106.802325] RAX: 00000000001f3600 RBX: ffff88012ccf5920 RCX: 0000000000000000
[569106.802331] RDX: 0000000000000000 RSI: fffffffffffffffb RDI: ffff88025151540c
[569106.802337] RBP: ffff880254d2f000 R08: 00000000fffffffd R09: ffff88025151ffff
[569106.802343] R10: ffffffff81600000 R11: ffffffff81600000 R12: ffff88042f058c00
[569106.802349] R13: ffff8801beb09000 R14: 0000000000000005 R15: ffff88042f058c18
[569106.802356] FS: 00007f6027661700(0000) GS:ffff88046fa00000(0000) knlGS:0000000000000000
[569106.802363] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[569106.802368] CR2: 000000000041f820 CR3: 00000001916d0000 CR4: 00000000000406f0
[569106.802375] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[569106.802381] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[569106.802388] Process mdadm (pid: 30710, threadinfo ffff8801a8a76000, task ffff880116fee380)
[569106.802393] Stack:
[569106.802397] 00000000fffffff4 0000000000000001 0000000000000001 ffff88042f058c18
[569106.802408] 0000000000000000 ffff8801a8a77e10 ffff8801a8a77e28 ffff88010031646d
[569106.802419] 30646961722d646d ffff880100000000 ffff88046fdfcc08 0000004081109b2e
[569106.802430] Call Trace:
[569106.802442] [<ffffffffa0657b11>] ? raid0_takeover+0x1c3/0x1e5 [raid0]
[569106.802456] [<ffffffffa066d409>] ? level_store+0x21b/0x52b [md_mod]
[569106.802470] [<ffffffffa066ec77>] ? md_attr_store+0x9a/0xbc [md_mod]
[569106.802483] [<ffffffff8114e4e7>] ? sysfs_write_file+0xe0/0x11c
[569106.802494] [<ffffffff810f9cc5>] ? vfs_write+0xa2/0xe9
[569106.802502] [<ffffffff810f9ea2>] ? sys_write+0x45/0x6b
[569106.802515] [<ffffffff81352012>] ? system_call_fastpath+0x16/0x1b
[569106.802519] Code: 4c 24 18 49 8b 6c 24 18 48 89 4c 24 18 eb 6b 48 8b 7d 30 48 8d 74 24 38 e8 d4 16 af e0 49 63 8c 24 bc 00 00 00 48 8b 45 10 31 d2 <48> f7 f1 48 0f af c1 48 89 45 10 4d 8b 6c 24 18 eb 2f 49 8b 7d
[569106.802594] RIP [<ffffffffa065745b>] create_strip_zones+0x71/0x491 [raid0]
[569106.802604] RSP <ffff8801a8a77d48>
[569106.802688] ---[ end trace dc1acf1d4fa82dd5 ]---
Afterwards, my mounted filesystem (/dev/md0) disappeared (it's no longer
mounted), and all operations related to software raid seem to fail:
gbl-macbook# umount /dev/md0
^C^C^C^C
<hangs forever>
11:41:38 goblin@gbl-macbook:~ % cat /proc/mdstat
<hangs forever but is Ctrl-Cable>
I haven't attempted to re-produce this yet.
--
Robert Goliasz
Infrastructure Engineer
--
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