Kernel Oops

[ehamberg]

I have seen this crash many times. This is on a 32-bit system running Ubuntu 12.04.
The following backtrace is produced when running 0.6.0rc9 (Ubuntu version 0.6.0.65-0ubuntu1~precise1):

[  146.752457] BUG: unable to handle kernel paging request at ffdd2000
[  146.752609] IP: [<c12b6e7d>] memcpy+0x1d/0x40
[  146.752711] *pdpt = 000000000193a001 *pde = 000000000e685067 *pte = 0000000000000000 
[  146.752883] Oops: 0000 [#1] SMP 
[  146.752965] Modules linked in: joydev snd_hda_codec_conexant arc4 i915 iwl3945 iwl_legacy snd_hda_intel snd_hda_codec drm_kms_helper parport_pc mac80211 drm snd_hwdep snd_pcm r852 sm_common nand nand_ids snd_timer mtd snd nand_bch ppdev r592 psmouse bch soundcore serio_raw memstick nand_ecc cfg80211 lp snd_page_alloc i2c_algo_bit mac_hid video parport zfs(P) zcommon(P) znvpair(P) zavl(P) zunicode(P) spl(O) zlib_deflate usb_storage firewire_ohci firewire_core sdhci_pci sdhci e100 crc_itu_t
[  146.754179] 
[  146.754218] Pid: 2229, comm: flush-zfs-5 Tainted: P           O 3.2.0-25-generic-pae #40-Ubuntu FUJITSU SIEMENS AMILO Pro V3205/10AD
[  146.754460] EIP: 0060:[<c12b6e7d>] EFLAGS: 00010216 CPU: 0
[  146.754568] EIP is at memcpy+0x1d/0x40
[  146.754644] EAX: d58c7000 EBX: 00006000 ECX: 00001400 EDX: ffdd1000
[  146.754763] ESI: ffdd2000 EDI: d58c8000 EBP: ca40bc60 ESP: ca40bc54
[  146.754882]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[  146.754987] Process flush-zfs-5 (pid: 2229, ti=ca40a000 task=ce9df1a0 task.ti=ca40a000)
[  146.755133] Stack:
[  146.755177]  ceb45328 00006000 00000000 ca40bcb0 d00f54f9 00000000 00000000 00006000
[  146.755386]  00000000 00000000 d018fcf6 ca40bca0 ca40bc9c 00000000 00006000 00000000
[  146.755594]  00006000 00000000 ce912608 00000001 cef05540 00000000 00000000 ca40bd30
[  146.755803] Call Trace:
[  146.755933]  [<d00f54f9>] dmu_write+0xc9/0x1b0 [zfs]
[  146.756134]  [<d0177acf>] zfs_putpage+0x20f/0x310 [zfs]
[  146.756149]  [<c12af6ab>] ? prio_tree_next+0x8b/0x160
[  146.756149]  [<c15a8add>] ? _raw_spin_lock+0xd/0x10
[  146.756149]  [<d0188d14>] zpl_putpage+0x34/0x60 [zfs]
[  146.756149]  [<c10fe833>] write_cache_pages+0x193/0x3f0
[  146.756149]  [<d0188ce0>] ? zpl_readpage+0x60/0x60 [zfs]
[  146.756149]  [<d0188c78>] zpl_writepages+0x18/0x20 [zfs]
[  146.756149]  [<c10ff822>] do_writepages+0x22/0x40
[  146.756149]  [<c1168699>] writeback_single_inode+0x129/0x390
[  146.756149]  [<c1168c39>] writeback_sb_inodes+0x159/0x1f0
[  146.756149]  [<c1168d44>] __writeback_inodes_wb+0x74/0xa0
[  146.756149]  [<c1168f9b>] wb_writeback+0x22b/0x2d0
[  146.756149]  [<c11690c0>] wb_check_old_data_flush+0x80/0x90
[  146.756149]  [<c1169d20>] wb_do_writeback+0x100/0x160
[  146.756149]  [<c1068560>] ? usleep_range+0x40/0x40
[  146.756149]  [<c1169df5>] bdi_writeback_thread+0x75/0x240
[  146.756149]  [<c1169d80>] ? wb_do_writeback+0x160/0x160
[  146.756149]  [<c107962d>] kthread+0x6d/0x80
[  146.756149]  [<c10795c0>] ? flush_kthread_worker+0x80/0x80
[  146.756149]  [<c15b047e>] kernel_thread_helper+0x6/0x10
[  146.756149] Code: c3 90 8d 74 26 00 e8 43 fe ff ff eb e8 90 55 89 e5 83 ec 0c 89 5d f4 89 75 f8 89 7d fc 3e 8d 74 26 00 89 cb 89 c7 c1 e9 02 89 d6 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 8b 5d f4 8b 75 f8 8b 7d fc 89 
[  146.756149] EIP: [<c12b6e7d>] memcpy+0x1d/0x40 SS:ESP 0068:ca40bc54
[  146.756149] CR2: 00000000ffdd2000
[  146.756149] ---[ end trace ad39668439c9671f ]---

[behlendorf]

Thanks when we get a minute we'll look in to it.

[FransUrbo]

@ehamberg @behlendorf Is this still an issue? There's been quite a number of fixes regarding 32bit systems the last year (and considering this bug is two years old)...

[ehamberg]

I switched to zfs-fuse on that machine, so I don't know if it was fixed. Since no one else has reported anything in two years it's probably safe to close it (and let people re-open if they hit this in recent versions).

[behlendorf]

Sounds good. We can reopen if needed.