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Date: Tue, 15 Feb 2011 23:48:29 +0000 Message-ID: Subject: Re: [PATCH V2 0/3] drivers/staging: zcache: dynamic page cache/swap compression From: Matt To: Dan Magenheimer Cc: gregkh@suse.de, Chris Mason , linux-kernel@vger.kernel.org, linux-mm@kvack.org, ngupta@vflare.org, minchan.kim@gmail.com, linux-btrfs@vger.kernel.org, Josef Bacik , Dan Rosenberg , Yan Zheng , miaox@cn.fujitsu.com, Li Zefan Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 36555 Lines: 763 On Mon, Feb 14, 2011 at 8:59 PM, Matt wrote: > On Mon, Feb 14, 2011 at 1:29 AM, Matt wrote: >> On Mon, Feb 14, 2011 at 1:24 AM, Matt wrote: >>> On Mon, Feb 14, 2011 at 12:08 AM, Matt wrote: >>>> On Wed, Feb 9, 2011 at 1:03 AM, Dan Magenheimer >>>> wrote: >>>> [snip] >>>>> >>>>> If I've missed anything important, please let me know! >>>>> >>>>> Thanks again! >>>>> Dan >>>>> >>>> >>>> Hi Dan, >>>> >>>> thank you so much for answering my email in such detail ! >>>> >>>> I shall pick up on that mail in my next email sending to the mailing list :) >>>> >>>> >>>> currently I've got a problem with btrfs which seems to get triggered >>>> by cleancache get-operations: >>>> >>>> >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297377] device fsid >>>> 354120c992a00761-5fa07d400126a895 devid 1 transid 7 >>>> /dev/mapper/portage >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297698] btrfs: enabling disk space caching >>>> Feb 14 00:37:19 lupus kernel: [ 2831.297700] btrfs: force lzo compression >>>> Feb 14 00:37:19 lupus kernel: [ 2831.315844] zcache: created ephemeral >>>> tmem pool, id=3 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853188] BUG: unable to handle >>>> kernel paging request at 0000000001400050 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853219] IP: [] >>>> btrfs_encode_fh+0x2b/0x120 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853242] PGD 0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853251] Oops: 0000 [#1] PREEMPT SMP >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853275] last sysfs file: >>>> /sys/devices/platform/coretemp.3/temp1_input >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853295] CPU 4 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853303] Modules linked in: radeon >>>> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT >>>> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc >>>> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp >>>> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables >>>> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack xt_mark >>>> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables x_tables >>>> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss snd_seq_midi_event >>>> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi >>>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm >>>> snd_timer snd soundcore i2c_i801 wmi e1000e shpchp snd_page_alloc >>>> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage >>>> ehci_hcd [last unloaded: tg3] >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853682] >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853690] Pid: 11394, comm: >>>> btrfs-transacti Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower >>>> G3710 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853725] RIP: >>>> 0010:[] ?[] >>>> btrfs_encode_fh+0x2b/0x120 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853751] RSP: >>>> 0018:ffff880129a11b00 ?EFLAGS: 00010246 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853767] RAX: 00000000000000ff >>>> RBX: ffff88014a1ce628 RCX: 0000000000000000 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853788] RDX: ffff880129a11b3c >>>> RSI: ffff880129a11b70 RDI: 0000000000000006 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853808] RBP: 0000000001400000 >>>> R08: ffffffff8133eef0 R09: ffff880129a11c68 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853829] R10: 0000000000000001 >>>> R11: 0000000000000001 R12: ffff88014a1ce780 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853849] R13: ffff88021fefc000 >>>> R14: ffff88021fef9000 R15: 0000000000000000 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853870] FS: >>>> 0000000000000000(0000) GS:ffff8800bf500000(0000) >>>> knlGS:0000000000000000 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853894] CS: ?0010 DS: 0000 ES: >>>> 0000 CR0: 000000008005003b >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853911] CR2: 0000000001400050 >>>> CR3: 0000000001c27000 CR4: 00000000000006e0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853932] DR0: 0000000000000000 >>>> DR1: 0000000000000000 DR2: 0000000000000000 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853952] DR3: 0000000000000000 >>>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853973] Process btrfs-transacti >>>> (pid: 11394, threadinfo ffff880129a10000, task ffff880202e4ac40) >>>> Feb 14 00:39:20 lupus kernel: [ 2951.853999] Stack: >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854006] ?ffff880129a11b50 >>>> ffff880000000003 ffff88003c60a098 0000000000000003 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854035] ?ffffffffffffffff >>>> ffffffff810e6aaa 0000000000000000 0000000602e4ac40 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854063] ?ffffffff8133e3f0 >>>> ffffffff810e6cee 0000000000001000 0000000000000000 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854092] Call Trace: >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854103] ?[] ? >>>> cleancache_get_key+0x4a/0x60 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854122] ?[] ? >>>> btrfs_wake_function+0x0/0x20 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854140] ?[] ? >>>> __cleancache_flush_inode+0x3e/0x70 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854161] ?[] ? >>>> truncate_inode_pages_range+0x42/0x440 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854182] ?[] ? >>>> btrfs_search_slot+0x89e/0xa00 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854201] ?[] ? >>>> unmap_mapping_range+0xc5/0x2a0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854220] ?[] ? >>>> truncate_pagecache+0x40/0x70 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854240] ?[] ? >>>> btrfs_truncate_free_space_cache+0x81/0xe0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854261] ?[] ? >>>> btrfs_write_dirty_block_groups+0x245/0x500 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854283] ?[] ? >>>> btrfs_run_delayed_refs+0x1ba/0x220 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854304] ?[] ? >>>> commit_cowonly_roots+0xff/0x1d0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854323] ?[] ? >>>> btrfs_commit_transaction+0x363/0x760 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854344] ?[] ? >>>> autoremove_wake_function+0x0/0x30 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854364] ?[] ? >>>> transaction_kthread+0x283/0x2a0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854383] ?[] ? >>>> transaction_kthread+0x0/0x2a0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854401] ?[] ? >>>> transaction_kthread+0x0/0x2a0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854420] ?[] ? >>>> kthread+0x96/0xa0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854437] ?[] ? >>>> kernel_thread_helper+0x4/0x10 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854455] ?[] ? >>>> kthread+0x0/0xa0 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854471] ?[] ? >>>> kernel_thread_helper+0x0/0x10 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854488] Code: 55 b8 ff 00 00 00 >>>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00 >>>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00 >>>> 48 89 06 84 c9 48 8b 85 68 fe ff ff >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854742] RIP ?[] >>>> btrfs_encode_fh+0x2b/0x120 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854762] ?RSP >>>> Feb 14 00:39:20 lupus kernel: [ 2951.854773] CR2: 0000000001400050 >>>> Feb 14 00:39:20 lupus kernel: [ 2951.860906] ---[ end trace >>>> f831c5ceeaa49287 ]--- >>>> >>>> in my case I had compress-force with lzo and disk_cache enabled >>>> >>>> >>>> another user of the kernel I'm currently running has had the same >>>> problem with zcache >>>> (http://forums.gentoo.org/viewtopic-p-6571799.html#6571799) >>>> >>>> (looks like in his case compression and any other fancy additional >>>> features weren't enabled) >>>> >>>> >>>> changes made by this kernel or patchset to btrfs are from >>>> * io-less dirty throttling patchset (44 patches) >>>> * zcache V2 ("[PATCH] staging: zcache: fix memory leak" should be >>>> applied in both cases) >>>> * PATCH] fix (latent?) memory corruption in btrfs_encode_fh() >>>> * btrfs-unstable changes to state of >>>> 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 (so practically equals btrfs >>>> from 2.6.38-rc4+) >>>> >>>> I haven't tried downgrading to vanilla 2.6.37 with zcache only, yet, >>>> >>>> but kind of upgraded btrfs to the latest state of the btrfs-unstable >>>> repository (http://git.eu.kernel.org/?p=linux/kernel/git/mason/btrfs-unstable.git;a=summary) >>>> namely 3a90983dbdcb2f4f48c0d771d8e5b4d88f27fae6 >>>> >>>> this also didn't help and seemed to produce the same error-message >>>> >>>> so to summarize: >>>> >>>> 1) error message appearing with all 4 patchsets applied changing >>>> btrfs-code and compress-force=lzo and disk_cache enabled >>>> >>>> 2) error message appearing with default mount-options and btrfs from >>>> 2.6.37 and changes for zcache & io-less dirty throttling patchset >>>> applied (first 2 patch(sets)) from list) >>>> >>>> >>>> in my case I tried to extract / play back a 1.7 GiB tarball of my >>>> portage-directory (lots of small files and some tar.bzip2 archives) >>>> via pbzip2 or 7z when the error happened and the message was shown >>>> >>>> Due to KMS sound (webradio streaming) was still running but I couldn't >>>> continue work (X switching to kernel output) so I did the magic sysrq >>>> combo (reisub) >>>> >>>> >>>> Does that BUG message ring a bell for anyone ? >>>> >>>> (if I should leave out anyone from the CC in the next emails or >>>> future, please holler - I don't want to spam your inboxes) >>>> >>>> Thanks >>>> >>>> Matt >>>> >>> >>> >>> OK, >>> >>> here's the output of a kernel - >>> >>> staying as close to vanilla (2.6.37) as the current situation allows >>> (only including some corruption or leak fixes for zram & zcache and >>> "zram_xvmalloc: 64K page fixes and optimizations" (and 2 reiserfs >>> fixes)): >>> >>> so in total the following patches are included in this new kernel >>> (2.6.37-zcache): >>> >>> zram changes: >>> 1 zram: Fix sparse warning 'Using plain integer as NULL pointer' >>> 2 [PATCH] zram: fix data corruption issue >>> 3 [PATCH 0/7][v2] zram_xvmalloc: 64K page fixes and optimizations >>> >>> zcache: >>> 1 zcache-linux-2.6.37-110205 >>> 2 [PATCH] staging: zcache: fix memory leak >>> 3 [PATCH] zcache: Fix build error when sysfs is not defined >>> >>> reiserfs: >>> 1 [PATCH] reiserfs: Make sure va_end() is always called after >>> 2 [patch] reiserfs: potential ERR_PTR dereference >>> >>> >>> the same procedure: >>> >>> trying to extract the mentioned portage-tarball: >>> >>> time (7z e -so -tbzip2 -mmt=5 /system/portage_backup_022011.tbz2 | tar >>> -xp -C /usr/gentoo/) >>> >>> >>> this hopefully should make it easier to track down the problem: >>> >>> >>> Feb 14 01:59:59 lupus kernel: [ ?364.777143] device fsid >>> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 7 >>> /dev/mapper/portage >>> Feb 14 01:59:59 lupus kernel: [ ?364.844994] zcache: created ephemeral >>> tmem pool, id=2 >>> Feb 14 02:02:49 lupus kernel: [ ?534.577573] BUG: unable to handle >>> kernel paging request at 0000000037610050 >>> Feb 14 02:02:49 lupus kernel: [ ?534.577605] IP: [] >>> btrfs_encode_fh+0x2b/0x110 >>> Feb 14 02:02:49 lupus kernel: [ ?534.577630] PGD 0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.577640] Oops: 0000 [#1] PREEMPT SMP >>> Feb 14 02:02:49 lupus kernel: [ ?534.577665] last sysfs file: >>> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map >>> Feb 14 02:02:49 lupus kernel: [ ?534.577693] CPU 5 >>> Feb 14 02:02:49 lupus kernel: [ ?534.577701] Modules linked in: radeon >>> ttm drm_kms_helper cfbcopyarea cfbimgblt cfbfillrect ipt_REJECT >>> ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc nf_conntrack_irc >>> nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp >>> iptable_filter ipt_addrtype xt_DSCP xt_dscp xt_iprange ip_tables >>> ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit xt_conntrack xt_mark >>> xt_multiport xt_connmark nf_conntrack xt_string ip6_tables x_tables >>> it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss snd_seq_midi_event >>> snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss snd_hda_codec_hdmi >>> snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm >>> snd_timer snd e1000e soundcore i2c_i801 shpchp snd_page_alloc wmi >>> libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb usb_storage >>> ehci_hcd [last unloaded: tg3] >>> Feb 14 02:02:49 lupus kernel: [ ?534.578114] >>> Feb 14 02:02:49 lupus kernel: [ ?534.578124] Pid: 8285, comm: tar Not >>> tainted 2.6.37-zcache #2 FMP55/ipower G3710 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578146] RIP: >>> 0010:[] ?[] >>> btrfs_encode_fh+0x2b/0x110 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578172] RSP: >>> 0018:ffff88023ea9dcc8 ?EFLAGS: 00010246 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578189] RAX: 00000000000000ff >>> RBX: ffff8800b8643228 RCX: 0000000000000000 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578210] RDX: ffff88023ea9dd04 >>> RSI: ffff88023ea9dd38 RDI: 0000000000000006 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578230] RBP: 0000000037610000 >>> R08: ffffffff81338c90 R09: 0000000000000000 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578251] R10: 0000000000000019 >>> R11: 0000000000000001 R12: ffff8800b8643380 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578272] R13: ffff8800b8643258 >>> R14: 00007fff806f1f00 R15: 0000000000000000 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578293] FS: >>> 00007f823d7ed700(0000) GS:ffff8800bf540000(0000) >>> knlGS:0000000000000000 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578317] CS: ?0010 DS: 0000 ES: >>> 0000 CR0: 0000000080050033 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578334] CR2: 0000000037610050 >>> CR3: 000000023dcef000 CR4: 00000000000006e0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578356] DR0: 0000000000000000 >>> DR1: 0000000000000000 DR2: 0000000000000000 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578377] DR3: 0000000000000000 >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578398] Process tar (pid: 8285, >>> threadinfo ffff88023ea9c000, task ffff88023e8b9d40) >>> Feb 14 02:02:49 lupus kernel: [ ?534.578421] Stack: >>> Feb 14 02:02:49 lupus kernel: [ ?534.578428] ?000000013d096000 >>> ffff88023ed84800 ffff88023ea9c000 0000000000000002 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578458] ?ffffffffffffffff >>> ffffffff810e3b1a 0000000000000001 000000061e1d5240 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578486] ?fffffffffffffffb >>> ffffffff810e3d5e ffff88010f383000 0000001ab86cb908 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578514] Call Trace: >>> Feb 14 02:02:49 lupus kernel: [ ?534.578525] ?[] ? >>> cleancache_get_key+0x4a/0x60 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578544] ?[] ? >>> __cleancache_flush_inode+0x3e/0x70 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578565] ?[] ? >>> truncate_inode_pages_range+0x42/0x440 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578586] ?[] ? >>> btrfs_tree_unlock+0x41/0x50 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578605] ?[] ? >>> btrfs_release_path+0x15/0x70 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578624] ?[] ? >>> btrfs_run_delayed_iputs+0x49/0x120 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578644] ?[] ? >>> btrfs_evict_inode+0x27/0x1e0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578663] ?[] ? >>> evict+0x1a/0xa0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578678] ?[] ? >>> iput+0x1cd/0x2b0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578694] ?[] ? >>> do_unlinkat+0x12f/0x1d0 >>> Feb 14 02:02:49 lupus kernel: [ ?534.578712] ?[] ? >>> system_call_fastpath+0x16/0x1b >>> Feb 14 02:02:49 lupus kernel: [ ?534.578730] Code: 55 b8 ff 00 00 00 >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00 >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00 >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff >>> Feb 14 02:02:49 lupus kernel: [ ?534.578986] RIP ?[] >>> btrfs_encode_fh+0x2b/0x110 >>> Feb 14 02:02:49 lupus kernel: [ ?534.579081] ?RSP >>> Feb 14 02:02:49 lupus kernel: [ ?534.579093] CR2: 0000000037610050 >>> Feb 14 02:02:49 lupus kernel: [ ?534.587513] ---[ end trace >>> c596b12e66c0b360 ]--- >>> >>> >>> for reference I've pasted it to pastebin.com: >>> >>> "2.6.37_zcache_V2.patch" >>> http://pastebin.com/cVSkwQ6M >>> >>> >>> >>> >>> >>> after the reboot I had forgotten to not mount the btrfs volume and it >>> threw a similar error-message again and remounted several partitions >>> read-only (including the system partition) >>> the partition with btrfs (/usr/gentoo) couldn't be unmounted since the >>> umount process kind of hang >>> >>> so here's the error message after a reboot (might not be accurate or >>> kind of "skewed" since other patches are included (io-less dirty >>> throttling, PATCH] fix (latent?) memory corruption in >>> btrfs_encode_fh() and latest changes for btrfs)) but might help to get >>> some more evidence: >>> >>> >>> Feb 14 02:05:46 lupus kernel: [ ? 63.922648] device fsid >>> 684a4213565dd3fe-ca991821badc2aac devid 1 transid 13 >>> /dev/mapper/portage >>> Feb 14 02:05:46 lupus kernel: [ ? 64.047118] btrfs: unlinked 1 orphans >>> Feb 14 02:05:46 lupus kernel: [ ? 64.051956] zcache: created ephemeral >>> tmem pool, id=3 >>> Feb 14 02:05:48 lupus kernel: [ ? 65.801364] hub 2-1:1.0: hub_suspend >>> Feb 14 02:05:48 lupus kernel: [ ? 65.801376] usb 2-1: unlink >>> qh256-0001/ffff88023fefd180 start 1 [1/0 us] >>> Feb 14 02:05:48 lupus kernel: [ ? 65.801559] usb 2-1: usb auto-suspend >>> Feb 14 02:05:50 lupus kernel: [ ? 67.797929] hub 2-0:1.0: hub_suspend >>> Feb 14 02:05:50 lupus kernel: [ ? 67.797939] usb usb2: bus auto-suspend >>> Feb 14 02:05:50 lupus kernel: [ ? 67.797942] ehci_hcd 0000:00:1d.0: >>> suspend root hub >>> Feb 14 02:05:52 lupus kernel: [ ? 70.050493] BUG: unable to handle >>> kernel paging request at 0000030341ed0050 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.050670] IP: [] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.050807] PGD 0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.050929] Oops: 0000 [#1] PREEMPT SMP >>> Feb 14 02:05:52 lupus kernel: [ ? 70.051223] last sysfs file: >>> /sys/module/pcie_aspm/parameters/policy >>> Feb 14 02:05:52 lupus kernel: [ ? 70.051365] CPU 6 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.051411] Modules linked in: >>> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc >>> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 >>> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp >>> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit >>> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack xt_string >>> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss >>> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss >>> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec >>> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp e1000e >>> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb >>> usb_storage ehci_hcd [last unloaded: tg3] >>> Feb 14 02:05:52 lupus kernel: [ ? 70.054694] >>> Feb 14 02:05:52 lupus kernel: [ ? 70.054776] Pid: 7962, comm: umount >>> Not tainted 2.6.37-plus_v16_zcache #4 FMP55/ipower G3710 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.054912] RIP: >>> 0010:[] ?[] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055084] RSP: >>> 0018:ffff88023c77d6f8 ?EFLAGS: 00010246 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055173] RAX: 00000000000000ff >>> RBX: ffff88023cde0168 RCX: 0000000000000000 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055265] RDX: ffff88023c77d734 >>> RSI: ffff88023c77d768 RDI: 0000000000000006 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055357] RBP: 0000030341ed0000 >>> R08: ffffffff8133eef0 R09: ffff88023c77d8d8 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055448] R10: 0000000000000003 >>> R11: 0000000000000001 R12: 00000000ffffffff >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055540] R13: ffff88023cde0030 >>> R14: ffffea0007dd39f0 R15: 0000000000000001 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055633] FS: >>> 00007fb1cad04760(0000) GS:ffff8800bf580000(0000) >>> knlGS:0000000000000000 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055762] CS: ?0010 DS: 0000 ES: >>> 0000 CR0: 000000008005003b >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055851] CR2: 0000030341ed0050 >>> CR3: 000000023c7d5000 CR4: 00000000000006e0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.055943] DR0: 0000000000000000 >>> DR1: 0000000000000000 DR2: 0000000000000000 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056035] DR3: 0000000000000000 >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056128] Process umount (pid: >>> 7962, threadinfo ffff88023c77c000, task ffff88023c7a4260) >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056257] Stack: >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056338] ?0000000000000000 >>> 0000000000000002 ffff880200000000 0000000000000003 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056630] ?ffffea0007dd39f0 >>> ffffffff810e6aaa ffff880200000041 0000000600000246 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.056922] ?ffff88023cdcd300 >>> ffffffff810e6b3a 0000000000000001 ffffffff8132bb7c >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057213] Call Trace: >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057301] ?[] ? >>> cleancache_get_key+0x4a/0x60 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057393] ?[] ? >>> __cleancache_get_page+0x7a/0xd0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057487] ?[] ? >>> merge_state+0x7c/0x150 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057579] ?[] ? >>> __extent_read_full_page+0x52e/0x710 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057673] ?[] ? >>> rb_insert_color+0xa4/0x140 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057766] ?[] ? >>> tree_insert+0x86/0x1e0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.057859] ?[] ? >>> lock_timer_base.clone.22+0x33/0x70 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058004] ?[] ? >>> btree_get_extent+0x0/0x1c0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058097] ?[] ? >>> read_extent_buffer_pages+0x2d1/0x470 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058191] ?[] ? >>> btree_get_extent+0x0/0x1c0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058283] ?[] ? >>> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058415] ?[] ? >>> read_tree_block+0x39/0x60 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058508] ?[] ? >>> read_block_for_search.clone.40+0x116/0x410 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058638] ?[] ? >>> btrfs_cow_block+0x118/0x2b0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058731] ?[] ? >>> btrfs_search_slot+0x307/0xa00 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058823] ?[] ? >>> lookup_inline_extent_backref+0x98/0x4a0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.058919] ?[] ? >>> kmem_cache_alloc+0x87/0xa0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059032] ?[] ? >>> __btrfs_free_extent+0xcc/0x6f0 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059125] ?[] ? >>> run_clustered_refs+0x39f/0x880 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059220] ?[] ? >>> pagevec_lookup_tag+0x18/0x20 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059312] ?[] ? >>> filemap_fdatawait_range+0x91/0x180 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059405] ?[] ? >>> btrfs_run_delayed_refs+0xc7/0x220 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059498] ?[] ? >>> btrfs_commit_transaction+0x7c/0x760 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059591] ?[] ? >>> autoremove_wake_function+0x0/0x30 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059683] ?[] ? >>> start_transaction+0x1bf/0x270 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059775] ?[] ? >>> __sync_filesystem+0x5a/0x90 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059867] ?[] ? >>> generic_shutdown_super+0x2d/0x100 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.059960] ?[] ? >>> kill_anon_super+0x9/0x50 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.060051] ?[] ? >>> deactivate_locked_super+0x26/0x80 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.060144] ?[] ? >>> sys_umount+0x7a/0x390 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.060235] ?[] ? >>> system_call_fastpath+0x16/0x1b >>> Feb 14 02:05:52 lupus kernel: [ ? 70.060325] Code: 55 b8 ff 00 00 00 >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00 >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00 >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff >>> Feb 14 02:05:52 lupus kernel: [ ? 70.063170] RIP ?[] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.063302] ?RSP >>> Feb 14 02:05:52 lupus kernel: [ ? 70.063386] CR2: 0000030341ed0050 >>> Feb 14 02:05:52 lupus kernel: [ ? 70.063528] ---[ end trace >>> 3313552d105b1535 ]--- >>> Feb 14 02:06:16 lupus kernel: [ ? 93.961960] BUG: unable to handle >>> kernel paging request at 0000030341ed0050 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962171] IP: [] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962307] PGD 0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962430] Oops: 0000 [#2] PREEMPT SMP >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962637] last sysfs file: >>> /sys/devices/system/cpu/cpu7/cache/index2/shared_cpu_map >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962766] CPU 5 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.962812] Modules linked in: >>> ipt_REJECT ipt_LOG xt_limit xt_tcpudp xt_state nf_nat_irc >>> nf_conntrack_irc nf_nat_ftp nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 >>> nf_conntrack_ftp iptable_filter ipt_addrtype xt_DSCP xt_dscp >>> xt_iprange ip_tables ip6table_filter xt_NFQUEUE xt_owner xt_hashlimit >>> xt_conntrack xt_mark xt_multiport xt_connmark nf_conntrack xt_string >>> ip6_tables x_tables it87 hwmon_vid coretemp snd_seq_dummy snd_seq_oss >>> snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss >>> snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec >>> snd_hwdep snd_pcm snd_timer snd i2c_i801 soundcore wmi shpchp e1000e >>> snd_page_alloc libphy e1000 scsi_wait_scan sl811_hcd ohci_hcd ssb >>> usb_storage ehci_hcd [last unloaded: tg3] >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966044] >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966127] Pid: 7915, comm: >>> btrfs-transacti Tainted: G ? ? ?D ? ? 2.6.37-plus_v16_zcache #4 >>> FMP55/ipower G3710 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966266] RIP: >>> 0010:[] ?[] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966440] RSP: >>> 0018:ffff88023c63b6e0 ?EFLAGS: 00010246 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966528] RAX: 00000000000000ff >>> RBX: ffff88023cde0168 RCX: 0000000000000000 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966620] RDX: ffff88023c63b71c >>> RSI: ffff88023c63b750 RDI: 0000000000000006 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966713] RBP: 0000030341ed0000 >>> R08: ffffffff8133eef0 R09: ffff88023c63b8c0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966805] R10: 0000000000000003 >>> R11: 0000000000000001 R12: 00000000ffffffff >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966897] R13: ffff88023cde0030 >>> R14: ffffea0007d59bc8 R15: 0000000000000001 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.966990] FS: >>> 0000000000000000(0000) GS:ffff8800bf540000(0000) >>> knlGS:0000000000000000 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967120] CS: ?0010 DS: 0000 ES: >>> 0000 CR0: 000000008005003b >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967209] CR2: 0000030341ed0050 >>> CR3: 0000000001c27000 CR4: 00000000000006e0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967302] DR0: 0000000000000000 >>> DR1: 0000000000000000 DR2: 0000000000000000 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967394] DR3: 0000000000000000 >>> DR6: 00000000ffff0ff0 DR7: 0000000000000400 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967500] Process btrfs-transacti >>> (pid: 7915, threadinfo ffff88023c63a000, task ffff88023c7a1620) >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967630] Stack: >>> Feb 14 02:06:16 lupus kernel: [ ? 93.967711] ?0000000000000000 >>> 0000000000000002 0000000000000000 0000000000000003 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968057] ?ffffea0007d59bc8 >>> ffffffff810e6aaa 0000000000000041 0000000600000002 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968348] ?0000000000000000 >>> ffffffff810e6b3a 0000000000000001 ffffffff00000001 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968639] Call Trace: >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968728] ?[] ? >>> cleancache_get_key+0x4a/0x60 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968820] ?[] ? >>> __cleancache_get_page+0x7a/0xd0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.968914] ?[] ? >>> __extent_read_full_page+0x52e/0x710 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969008] ?[] ? >>> update_reserved_bytes+0xb3/0x140 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969102] ?[] ? >>> btree_get_extent+0x0/0x1c0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969193] ?[] ? >>> merge_state+0x7c/0x150 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969285] ?[] ? >>> read_extent_buffer_pages+0x2d1/0x470 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969378] ?[] ? >>> btree_get_extent+0x0/0x1c0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969470] ?[] ? >>> btree_read_extent_buffer_pages.clone.65+0x4d/0xa0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969602] ?[] ? >>> read_tree_block+0x39/0x60 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969694] ?[] ? >>> read_block_for_search.clone.40+0x116/0x410 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969878] ?[] ? >>> btrfs_search_slot+0x307/0xa00 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.969970] ?[] ? >>> lookup_inline_extent_backref+0x98/0x4a0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970065] ?[] ? >>> kmem_cache_alloc+0x87/0xa0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970157] ?[] ? >>> __btrfs_free_extent+0xcc/0x6f0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970249] ?[] ? >>> update_block_group.clone.62+0xc4/0x280 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970343] ?[] ? >>> run_clustered_refs+0x39f/0x880 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970436] ?[] ? >>> btrfs_run_delayed_refs+0xc7/0x220 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970529] ?[] ? >>> new_slab+0x169/0x1f0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970619] ?[] ? >>> btrfs_commit_transaction+0x7c/0x760 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970713] ?[] ? >>> autoremove_wake_function+0x0/0x30 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970806] ?[] ? >>> transaction_kthread+0x283/0x2a0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970898] ?[] ? >>> transaction_kthread+0x0/0x2a0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.970990] ?[] ? >>> transaction_kthread+0x0/0x2a0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.971083] ?[] ? >>> kthread+0x96/0xa0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.971174] ?[] ? >>> kernel_thread_helper+0x4/0x10 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.971266] ?[] ? >>> kthread+0x0/0xa0 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.971355] ?[] ? >>> kernel_thread_helper+0x0/0x10 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.971444] Code: 55 b8 ff 00 00 00 >>> 53 48 89 fb 48 83 ec 18 48 8b 6f 10 8b 3a 83 ff 04 0f 86 d5 00 00 00 >>> 85 c9 0f 95 c1 83 ff 07 0f 86 d5 00 00 00 <48> 8b 45 50 bf 05 00 00 00 >>> 48 89 06 84 c9 48 8b 85 68 fe ff ff >>> Feb 14 02:06:16 lupus kernel: [ ? 93.974280] RIP ?[] >>> btrfs_encode_fh+0x2b/0x120 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.974412] ?RSP >>> Feb 14 02:06:16 lupus kernel: [ ? 93.974497] CR2: 0000030341ed0050 >>> Feb 14 02:06:16 lupus kernel: [ ? 93.974599] ---[ end trace >>> 3313552d105b1536 ]--- >>> Feb 14 02:07:04 lupus kernel: [ ?141.906124] zcache: destroyed pool id=2 >>> Feb 14 02:07:17 lupus kernel: [ ?154.783358] SysRq : Keyboard mode set >>> to system default >>> Feb 14 02:07:18 lupus kernel: [ ?155.486147] SysRq : Terminate All Tasks >>> >>> >>> That's all for now >>> >>> Thanks & Regards >>> >>> Matt >>> >> >> (leaving out several folks from the CC to avoid spamming - if I left >> out someone wrongfully please re-add) >> >> running an addr2line reveals: >> >> >> addr2line -e /usr/src/linux-2.6.37_vanilla/vmlinux -i ffffffff81338cbb >> export.c:0 >> >> >> hope that helps >> >> >> Regards >> >> Matt >> > > > ok, maybe it's useful to have some more details how to reproduce it as > easily as possible and about my configuration: > > preparation steps: > > 1) 2.6.37 vanilla kernel with the mentioned changes to zram (and > xvmalloc), zcache (+ fixes) > > configuration specifics: > > CONFIG_CRYPTO_PCRYPT=y > > 2) on a non-btrfs partition or with zcache disable: get a > portage-tarball comparable to mine download from one of the > gentoo-mirrors (http://www.gentoo.org/main/en/mirrors2.xml), e.g. the > University of California: > ftp://ftp.ucsb.edu/pub/mirrors/linux/gentoo/snapshots/ > > (weighing only around 40 MiB) then > > get that tarball to a decent size by adding the latest changes from a > rsync-mirror (http://www.gentoo.org/main/en/mirrors-rsync.xml) > > I can also upload my specific tarball weighing at 1.7 GiB at request - > just point me a place to drop it > > 3) creating a tar.bzip2 ball (preferably via 7z or pbzip2 so that it > can be extracted later in parallel to create some pressure) > > > Hardware: > core i7 860 (4 cores - ht -> 8 threads), 8 GiB of RAM, > underlying harddrive is a Samsung HD203WI, NCQ is disabled > (queue_depth set to "1"), using CFQ as i/o scheduler > > echo "13" > /proc/sys/vm/page-cluster > echo "60" > /proc/sys/vm/swappiness > echo "3000" > /proc/sys/vm/dirty_expire_centisecs > echo "1500" ?> /proc/sys/vm/dirty_writeback_centisecs > echo "15" > /proc/sys/vm/dirty_background_ratio > echo "50" ? > /proc/sys/vm/dirty_ratio > echo "50" > /proc/sys/vm/vfs_cache_pressure > echo "32768" > /proc/sys/vm/min_free_kbytes > > for i in /sys/block/sd*; do > ? ? ? ? /bin/echo "4096" > ?$i/queue/read_ahead_kb > ? ? ? ? /bin/echo "64" > ?$i/queue/max_sectors_kb > ? ? ? ? /bin/echo "1" ? > ?$i/queue/rq_affinity > done > > nr_requests is set to "1024" > > slice_sync to "150" > fifo_expire_sync to "50" > > echo 4096 > /sys/class/bdi/default/read_ahead_kb > > > steps to get the "result": > > 1) cryptsetup-partition with aes or twofish-encryption (512 bits) > [using cryptsetup 1.1.3* or 1.2*] > > 2) on top of that btrfs > > 3) extracting the tarball (usually I'm adding a "time" in front to see > how long it took): time (7z e -so -tbzip2 -mmt=5 > /system/portage_backup_022011.tbz2 | tar > -xp -C /usr/gentoo/) > > > "result": > > 1) it seems to take several seconds or even minutes until that BUG > message gets shown so maybe some memory (or other kind of subsystem) > pressure is needed to trigger it > > > I hope that's useful in reproducing the BUG > > > Thanks & Regards > > Matt > *bump* adding: Li Zefan, Miao Xie, Yan Zheng, Dan Rosenberg, Josef Bacik and the btrfs mailing list to CC -- To unsubscribe from this list: send the line "unsubscribe 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