From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Klaube Subject: Re: bcache bug / fs freeze on heavy IO Date: Fri, 22 Aug 2014 14:51:21 +0200 (CEST) Message-ID: <1721884467.4556004.1408711881311.JavaMail.zimbra@klaube.net> References: <318258231.4483994.1408694008758.JavaMail.zimbra@klaube.net> <58978953.4484590.1408694179180.JavaMail.zimbra@klaube.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from orion.efm.de ([195.190.148.230]:46832 "EHLO orion.efm.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755982AbaHVMvX convert rfc822-to-8bit (ORCPT ); Fri, 22 Aug 2014 08:51:23 -0400 In-Reply-To: Sender: linux-bcache-owner@vger.kernel.org List-Id: linux-bcache@vger.kernel.org To: Kent Overstreet Cc: linux-bcache@vger.kernel.org ----- Urspr=C3=BCngliche Mail ----- > Von: "Kent Overstreet" > An: "Thomas Klaube" > CC: linux-bcache@vger.kernel.org > Gesendet: Freitag, 22. August 2014 11:42:09 > Betreff: Re: bcache bug / fs freeze on heavy IO Hi Kent, > how large of an SSD/what bucket size were you using? The SSD is 900GB (HW Raid 1 over 2 Samsung SSDs). Bucket size is 512k=20 (thats what cat /sys/fs/bcache/3a26850d-c5a3-4919-93c3-51cdb99bec65/buc= ket_size says).=20 > it's possible you tripped over a bug I recently fixed in the dev > branch when the btree grew to depth 2 - that had lurked for awhile > because with ~1 mb buckets you need around a terabyte or so SSD to ge= t > a depth 2 btree in normal usage... Is the fix already in the 3.17-rc1 kernel? Then I would setup a testrun with 3.17-rc1. I could also setup a testrun on the Ubuntu 3.13.0-34 ker= nel if that is helpful... There was nothing else in the Log before the BUG_ON().=20 Regards Thomas >=20 > On Fri, Aug 22, 2014 at 2:38 AM, Kent Overstreet = wrote: > > there weren't any bcache changes in 3.16 from 3.15, so unless you h= it > > this again or someone else reports it I would think you just got > > unlucky. > > > > there's a bunch of fixes queued up for 3.17 though, and more I need= to > > backport and push out... > > > > On Fri, Aug 22, 2014 at 2:34 AM, Kent Overstreet wrote: > >> ouch. > >> > >> Is there anything more in the log before it hit that BUG_ON()? > >> > >> On Fri, Aug 22, 2014 at 12:56 AM, Thomas Klaube wrote: > >>> Hi, > >>> > >>> (I have sent this also to linux-kernel by mistake) > >>> > >>> while testing/benchmarking with fio on a bcache backed ext4 fs I = see > >>> this dmesg output. System is ubuntu 14.04.1 but with vanilla Kern= el > >>> 3.16.1: > >>> > >>> Aug 22 00:57:01 ubuntu kernel: [19115.694955] ------------[ cut h= ere > >>> ]------------ > >>> Aug 22 00:57:01 ubuntu kernel: [19115.695519] kernel BUG at > >>> drivers/md/bcache/btree.c:2053! > >>> Aug 22 00:57:01 ubuntu kernel: [19115.696066] invalid opcode: 000= 0 [#1] > >>> SMP > >>> Aug 22 00:57:01 ubuntu kernel: [19115.696619] Modules linked in: = xfs > >>> libcrc32c usb_storage x86_pkg_temp_thermal intel_powerclamp coret= emp > >>> kvm_intel kvm crct10dif_pclmul crc32_pclmul ast ghash_clmulni_int= el > >>> aesni_intel aes_x86_64 syscopyarea sysfillrect sysimgblt glue_hel= per > >>> mei_me mei drm_kms_helper bonding ttm lpc_ich lrw gf128mul ipmi_s= i > >>> ablk_helper drm video shpchp cryptd acpi_pad hid_generic usbhid h= id > >>> btrfs xor raid6_pq bcache ses enclosure megaraid_sas e1000e igb > >>> i2c_algo_bit dca ptp pps_core [last unloaded: usb_storage] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.699123] CPU: 3 PID: 274 Com= m: > >>> bcache_gc Not tainted 3.16.1 #4 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.699756] Hardware name: Supe= rmicro > >>> X10SLM-F/X10SLM-F, BIOS 2.0 04/24/2014 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.700387] task: ffff880404d59= 920 ti: > >>> ffff8803cd320000 task.ti: ffff8803cd320000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.701022] RIP: > >>> 0010:[] [] btree_split+0x4d5= /0x6c0 > >>> [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.701670] RSP: 0018:ffff8803c= d3238d8 > >>> EFLAGS: 00010283 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.702305] RAX: ffff8803cd3239= 70 RBX: > >>> ffff88030e82e400 RCX: ffffffffa01d6660 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.702942] RDX: 00000000000000= 00 RSI: > >>> 0000000000000200 RDI: ffff8803cd323870 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.703577] RBP: ffff8803cd3239= e8 R08: > >>> 0000000000000000 R09: 0000000000000003 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.704205] R10: 00000000000000= 04 R11: > >>> 0000000000000005 R12: ffff8800d7584400 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.704829] R13: 00000000000000= 00 R14: > >>> ffff88030e82e4d0 R15: ffff8803cd323e28 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.705469] FS: 00000000000000= 00(0000) > >>> GS:ffff88041fd80000(0000) knlGS:0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.706085] CS: 0010 DS: 0000 = ES: 0000 > >>> CR0: 0000000080050033 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.706697] CR2: 00007f3b3938c0= 00 CR3: > >>> 0000000001c13000 CR4: 00000000001407e0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.707310] DR0: 00000000000000= 00 DR1: > >>> 0000000000000000 DR2: 0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.707915] DR3: 00000000000000= 00 DR6: > >>> 00000000fffe0ff0 DR7: 0000000000000400 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.708510] Stack: > >>> Aug 22 00:57:01 ubuntu kernel: [19115.709107] ffff8803cd3238f0 > >>> ffff8800d7584498 0000000000000000 ffff8803cd323b20 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.709705] 00001162b81ec3bd > >>> 0000000000000000 ffff880404d59920 0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.710303] 0000000000000000 > >>> 0000000000000000 00000000a0000001 ffff8803cd323940 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.710894] Call Trace: > >>> Aug 22 00:57:01 ubuntu kernel: [19115.711474] [] ? > >>> arch_vtime_task_switch+0x94/0xa0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.712061] [] ? > >>> vtime_common_task_switch+0x3d/0x40 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.712643] [] ? > >>> finish_task_switch+0x128/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.713217] [] > >>> bch_btree_insert_node+0x2aa/0x3b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.713791] [] > >>> btree_gc_coalesce.isra.28+0x6e4/0x870 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.714363] [] > >>> btree_gc_recurse+0x1b1/0x300 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.714927] [] > >>> btree_gc_recurse+0x9e/0x300 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.715516] [] > >>> bch_btree_gc+0x42b/0x5b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.716063] [] ? > >>> prepare_to_wait_event+0x100/0x100 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.716605] [] > >>> bch_gc_thread+0x38/0x120 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.717155] [] ? > >>> bch_btree_gc+0x5b0/0x5b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.717706] [] > >>> kthread+0xd2/0xf0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.718257] [] ? > >>> kthread_create_on_node+0x180/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.718818] [] > >>> ret_from_fork+0x7c/0xb0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.719383] [] ? > >>> kthread_create_on_node+0x180/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.719952] Code: 8d 44 c2 10 4= 8 8d 95 > >>> 48 ff ff ff 48 89 85 50 ff ff ff e8 ff 01 00 00 48 8b 85 50 ff ff= ff 48 > >>> 39 85 48 ff ff ff 0f 84 6c fd ff ff <0f> 0b 66 0f 1f 84 00 00 00 = 00 00 > >>> 4c 8b 35 e9 0e 02 00 4d 85 f6 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.721195] RIP [] > >>> btree_split+0x4d5/0x6c0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.721815] RSP > >>> Aug 22 00:57:01 ubuntu kernel: [19115.724499] ------------[ cut h= ere > >>> ]------------ > >>> Aug 22 00:57:01 ubuntu kernel: [19115.725160] kernel BUG at > >>> arch/x86/mm/pageattr.c:216! > >>> Aug 22 00:57:01 ubuntu kernel: [19115.725819] invalid opcode: 000= 0 [#2] > >>> SMP > >>> Aug 22 00:57:01 ubuntu kernel: [19115.726475] Modules linked in: = xfs > >>> libcrc32c usb_storage x86_pkg_temp_thermal intel_powerclamp coret= emp > >>> kvm_intel kvm crct10dif_pclmul crc32_pclmul ast ghash_clmulni_int= el > >>> aesni_intel aes_x86_64 syscopyarea sysfillrect sysimgblt glue_hel= per > >>> mei_me mei drm_kms_helper bonding ttm lpc_ich lrw gf128mul ipmi_s= i > >>> ablk_helper drm video shpchp cryptd acpi_pad hid_generic usbhid h= id > >>> btrfs xor raid6_pq bcache ses enclosure megaraid_sas e1000e igb > >>> i2c_algo_bit dca ptp pps_core [last unloaded: usb_storage] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.729293] CPU: 3 PID: 274 Com= m: > >>> bcache_gc Not tainted 3.16.1 #4 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.729962] Hardware name: Supe= rmicro > >>> X10SLM-F/X10SLM-F, BIOS 2.0 04/24/2014 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.730628] task: ffff880404d59= 920 ti: > >>> ffff8803cd320000 task.ti: ffff8803cd320000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.731292] RIP: > >>> 0010:[] [] > >>> change_page_attr_set_clr+0x433/0x440 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.731968] RSP: 0018:ffff8803c= d322cc8 > >>> EFLAGS: 00010046 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.732631] RAX: 00000000000000= 46 RBX: > >>> 0000000000000000 RCX: 0000000000000010 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.733292] RDX: 00000000000020= 00 RSI: > >>> 0000000000000000 RDI: 0000000080000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.733943] RBP: ffff8803cd322d= 58 R08: > >>> 0000000000000001 R09: 0000000000000004 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.734591] R10: ffff88041fd94e= 48 R11: > >>> 0000000000000000 R12: 0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.735233] R13: 00000000000000= 10 R14: > >>> 0000000000000004 R15: 0000000000000005 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.735872] FS: 00000000000000= 00(0000) > >>> GS:ffff88041fd80000(0000) knlGS:0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.736518] CS: 0010 DS: 0000 = ES: 0000 > >>> CR0: 0000000080050033 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.737159] CR2: 00007f3b3938c0= 00 CR3: > >>> 0000000001c13000 CR4: 00000000001407e0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.737803] DR0: 00000000000000= 00 DR1: > >>> 0000000000000000 DR2: 0000000000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.738441] DR3: 00000000000000= 00 DR6: > >>> 00000000fffe0ff0 DR7: 0000000000000400 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.739075] Stack: > >>> Aug 22 00:57:01 ubuntu kernel: [19115.739708] ffff8803cd322d08 > >>> 0000000000000000 0000000000000000 0000000000000200 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.740360] 0000000000000008 > >>> 0000000000000000 0000000000000000 0000000000000010 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.741000] 0000000000000000 > >>> 0000000500000001 00000000000ccb18 0000020000000000 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.741631] Call Trace: > >>> Aug 22 00:57:01 ubuntu kernel: [19115.742253] [] > >>> _set_pages_array+0xe6/0x130 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.742879] [] > >>> set_pages_array_wc+0x13/0x20 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.743501] [] > >>> ttm_set_pages_caching+0x2f/0x70 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.744125] [] > >>> ttm_alloc_new_pages.isra.6+0xbc/0x190 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.744757] [] > >>> ttm_pool_populate+0x3c3/0x4d0 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.745379] [] > >>> ast_ttm_tt_populate+0xe/0x10 [ast] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.746000] [] > >>> ttm_bo_move_memcpy+0x5d1/0x680 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.746585] [] > >>> ast_bo_move+0x18/0x20 [ast] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.747173] [] > >>> ttm_bo_handle_move_mem+0x265/0x5b0 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.747762] [] ? > >>> ttm_bo_mem_space+0x116/0x340 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.748353] [] > >>> ttm_bo_validate+0x21f/0x230 [ttm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.748940] [] > >>> ast_bo_push_sysram+0x82/0xe0 [ast] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.749527] [] > >>> ast_crtc_do_set_base.isra.14.constprop.24+0x75/0x350 [ast] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.750134] [] > >>> ast_crtc_mode_set+0xaf4/0xc50 [ast] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.750728] [] > >>> drm_crtc_helper_set_mode+0x2b9/0x4f0 [drm_kms_helper] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.751328] [] > >>> drm_crtc_helper_set_config+0x87f/0xaa0 [drm_kms_helper] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.751929] [] ? > >>> __ww_mutex_lock+0x1b/0x97 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.752521] [] > >>> drm_mode_set_config_internal+0x61/0xe0 [drm] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.753100] [] > >>> drm_fb_helper_pan_display+0x94/0xf0 [drm_kms_helper] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.753675] [] > >>> fb_pan_display+0xc9/0x190 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.754245] [] > >>> bit_update_start+0x20/0x50 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.754815] [] > >>> fbcon_switch+0x3a2/0x550 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.755382] [] > >>> redraw_screen+0x189/0x240 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.755987] [] ? > >>> fb_blank+0x9e/0xc0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.756551] [] > >>> fbcon_blank+0x20a/0x2d0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.757097] [] ? > >>> wake_up_klogd+0x34/0x50 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.757625] [] ? > >>> console_unlock+0x1f8/0x440 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.758140] [] ? > >>> lock_timer_base.isra.34+0x2b/0x50 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.758637] [] ? > >>> internal_add_timer+0x2f/0x70 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.759128] [] ? > >>> mod_timer+0x12a/0x1e0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.759610] [] > >>> do_unblank_screen+0xb8/0x1f0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.760082] [] > >>> unblank_screen+0x10/0x20 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.760544] [] > >>> bust_spinlocks+0x19/0x40 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.761000] [] > >>> oops_end+0x38/0x150 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.761462] [] > >>> die+0x4b/0x70 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.761917] [] > >>> do_trap+0xb0/0x150 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.762374] [] > >>> do_error_trap+0x97/0x150 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.762835] [] ? > >>> btree_split+0x4d5/0x6c0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.763299] [] ? > >>> native_sched_clock+0x35/0x90 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.763755] [] ? > >>> sched_clock+0x9/0x10 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.764200] [] ? > >>> sched_clock_cpu+0x85/0xc0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.764645] [] ? > >>> bch_btree_insert_keys+0x72/0x200 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.765098] [] > >>> do_invalid_op+0x20/0x30 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.765552] [] > >>> invalid_op+0x1e/0x30 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.766023] [] ? > >>> btree_split+0x4d5/0x6c0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.766475] [] ? > >>> btree_split+0x4c1/0x6c0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.766919] [] ? > >>> arch_vtime_task_switch+0x94/0xa0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.767384] [] ? > >>> vtime_common_task_switch+0x3d/0x40 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.767870] [] ? > >>> finish_task_switch+0x128/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.768342] [] > >>> bch_btree_insert_node+0x2aa/0x3b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.768771] [] > >>> btree_gc_coalesce.isra.28+0x6e4/0x870 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.769212] [] > >>> btree_gc_recurse+0x1b1/0x300 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.769659] [] > >>> btree_gc_recurse+0x9e/0x300 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.770099] [] > >>> bch_btree_gc+0x42b/0x5b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.770533] [] ? > >>> prepare_to_wait_event+0x100/0x100 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.770971] [] > >>> bch_gc_thread+0x38/0x120 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.771441] [] ? > >>> bch_btree_gc+0x5b0/0x5b0 [bcache] > >>> Aug 22 00:57:01 ubuntu kernel: [19115.771919] [] > >>> kthread+0xd2/0xf0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.772380] [] ? > >>> kthread_create_on_node+0x180/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.772806] [] > >>> ret_from_fork+0x7c/0xb0 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.773225] [] ? > >>> kthread_create_on_node+0x180/0x180 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.773645] Code: ff ff 48 8b 4= d 80 e9 > >>> 9f fc ff ff 0f 0b 0f 0b be ba 00 00 00 48 c7 c7 09 99 a2 81 89 4d= 80 e8 > >>> 95 ed 00 00 8b 4d 80 e9 04 ff ff ff <0f> 0b 66 66 2e 0f 1f 84 00 = 00 00 > >>> 00 00 0f 1f 44 00 00 55 48 89 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.774598] RIP [] > >>> change_page_attr_set_clr+0x433/0x440 > >>> Aug 22 00:57:01 ubuntu kernel: [19115.775044] RSP > >>> Aug 22 00:57:01 ubuntu kernel: [19115.775494] ---[ end trace > >>> 658339f61e40f6ce ]--- > >>> > >>> Is bcache considered stable in 3.16 kernel? Is there anything I > >>> could do to debug? I had also problems with xfs on top of bcache. > >>> > >>> > >>> Thanx and Regards > >>> Thomas Klaube > >>> -- > >>> To unsubscribe from this list: send the line "unsubscribe linux-b= cache" > >>> in > >>> the body of a message to majordomo@vger.kernel.org > >>> More majordomo info at http://vger.kernel.org/majordomo-info.htm= l >