Hello,
I am using bcache in my laptop (RAM 32 GiB). I have been using it
perfectly for a month. ext4 + bcache.
Yesterday, system did not want do to a normal startup. Messages where
from udev out of memory (and udevadm killed?) and system was not
mounting / (/dev/bcache0).
After verifying/trying some things I found that:
bcache tries to prepare /dev/bcache0 but something happens (udev
related?) and the caching device is slave of it. If bcache can go on,
then prepares /dev/bcache1 with the same caching device and the
backing device.
# ls /sys/block/bcache?/slaves
/sys/block/bcache0/slaves:
sda1
/sys/block/bcache1/slaves:
sda1 sdb7
# cat /sys/block/bcache?/stat
418 0 3344 0 0 0 0
0 0 0 0
137372 0 2151740 456928 2476 0 138440
46252 0 0 0
so mounting /dev/bcache1 allows normal startup, but with something
messed up, I guess.
I got two ways for booting:
1) If I boot with only 16 GiB of RAM, it runs O.K. (physically only 16
GiB or with boot parameter mem=16G - mem=17G also boots; mem=20G does
not boot well)
2) booting with /dev/bcache1 as the root filesystem.
In this second case, I can see dmesg, so here it goes:
[ 3.619572] bcache: bch_journal_replay() journal replay done, 754
keys in 46 entries, seq 443121
[ 6.746571] bcache-register invoked oom-killer: gfp_mask=0x82d2,
order=0, oom_score_adj=0
[ 6.746575] bcache-register cpuset=/ mems_allowed=0
[ 6.746578] CPU: 1 PID: 296 Comm: bcache-register Not tainted 3.12.9 #1
[ 6.746580] Hardware name: Micro-Star International Co., Ltd.
GT60/MS-16F3, BIOS E16F3IMS.10U 01/21/2013
[ 6.746581] 0000ebc8000000e3 ffffffff8137e021 ffff8800371ab0c0
ffffffff8137c481
[ 6.746584] ffffffff8138110e ffffffff8138038b 0000000000000020
ffffffff810363f2
[ 6.746587] ffffffff81099f9b ffff880803afa040 ffffffff814fb060
0000000000000000
[ 6.746589] Call Trace:
[ 6.746596] [<ffffffff8137e021>] ? dump_stack+0x41/0x51
[ 6.746599] [<ffffffff8137c481>] ? dump_header+0x70/0x1a2
[ 6.746601] [<ffffffff8138110e>] ? _cond_resched+0x5/0x14
[ 6.746604] [<ffffffff8138038b>] ? mutex_lock+0x9/0x25
[ 6.746608] [<ffffffff810363f2>] ? put_online_cpus+0x1e/0x64
[ 6.746612] [<ffffffff81099f9b>] ? rcu_oom_notify+0xc0/0xd2
[ 6.746614] [<ffffffff810bee32>] ? oom_kill_process+0x6f/0x2c0
[ 6.746616] [<ffffffff810bf590>] ? out_of_memory+0x3d8/0x3f1
[ 6.746619] [<ffffffff810c365d>] ? __alloc_pages_nodemask+0x64e/0x7d0
[ 6.746624] [<ffffffff810f0f15>] ? alloc_pages_current+0xef/0x109
[ 6.746627] [<ffffffff810e70aa>] ? __vmalloc_node_range+0x143/0x1de
[ 6.746635] [<ffffffffa01d7d1c>] ? bcache_device_init+0x81/0x241 [bcache]
[ 6.746637] [<ffffffff810e7171>] ? __vmalloc_node+0x2c/0x31
[ 6.746642] [<ffffffffa01d7d1c>] ? bcache_device_init+0x81/0x241 [bcache]
[ 6.746645] [<ffffffff810e71ab>] ? vzalloc+0x21/0x22
[ 6.746649] [<ffffffffa01d7d1c>] ? bcache_device_init+0x81/0x241 [bcache]
[ 6.746653] [<ffffffffa01d805e>] ? flash_dev_run+0x7d/0x12b [bcache]
[ 6.746658] [<ffffffffa01d988b>] ? run_cache_set+0x5c4/0x695 [bcache]
[ 6.746664] [<ffffffffa01dae47>] ? register_bcache+0x10a0/0x12d9 [bcache]
[ 6.746666] [<ffffffff810f0f15>] ? alloc_pages_current+0xef/0x109
[ 6.746670] [<ffffffff81159855>] ? sysfs_write_file+0xcf/0x103
[ 6.746674] [<ffffffff81106a23>] ? vfs_write+0xa8/0x10b
[ 6.746677] [<ffffffff8110705e>] ? SyS_write+0x41/0x74
[ 6.746680] [<ffffffff81386ca2>] ? system_call_fastpath+0x16/0x1b
[ 6.746682] Mem-Info:
[ 6.746683] Node 0 DMA per-cpu:
[ 6.746685] CPU 0: hi: 0, btch: 1 usd: 0
[ 6.746686] CPU 1: hi: 0, btch: 1 usd: 0
[ 6.746687] CPU 2: hi: 0, btch: 1 usd: 0
[ 6.746688] CPU 3: hi: 0, btch: 1 usd: 0
[ 6.746689] CPU 4: hi: 0, btch: 1 usd: 0
[ 6.746691] CPU 5: hi: 0, btch: 1 usd: 0
[ 6.746692] CPU 6: hi: 0, btch: 1 usd: 0
[ 6.746693] CPU 7: hi: 0, btch: 1 usd: 0
[ 6.746694] Node 0 DMA32 per-cpu:
[ 6.746695] CPU 0: hi: 186, btch: 31 usd: 157
[ 6.746697] CPU 1: hi: 186, btch: 31 usd: 94
[ 6.746698] CPU 2: hi: 186, btch: 31 usd: 96
[ 6.746699] CPU 3: hi: 186, btch: 31 usd: 81
[ 6.746700] CPU 4: hi: 186, btch: 31 usd: 169
[ 6.746701] CPU 5: hi: 186, btch: 31 usd: 50
[ 6.746702] CPU 6: hi: 186, btch: 31 usd: 40
[ 6.746704] CPU 7: hi: 186, btch: 31 usd: 84
[ 6.746704] Node 0 Normal per-cpu:
[ 6.746706] CPU 0: hi: 186, btch: 31 usd: 108
[ 6.746707] CPU 1: hi: 186, btch: 31 usd: 112
[ 6.746708] CPU 2: hi: 186, btch: 31 usd: 127
[ 6.746709] CPU 3: hi: 186, btch: 31 usd: 176
[ 6.746710] CPU 4: hi: 186, btch: 31 usd: 166
[ 6.746711] CPU 5: hi: 186, btch: 31 usd: 169
[ 6.746712] CPU 6: hi: 186, btch: 31 usd: 117
[ 6.746714] CPU 7: hi: 186, btch: 31 usd: 174
[ 6.746717] active_anon:2478 inactive_anon:19 isolated_anon:0
[ 6.746717] active_file:364 inactive_file:271 isolated_file:0
[ 6.746717] unevictable:10512 dirty:0 writeback:0 unstable:0
[ 6.746717] free:51389 slab_reclaimable:1259 slab_unreclaimable:3625
[ 6.746717] mapped:328 shmem:32 pagetables:490 bounce:0
[ 6.746717] free_cma:0
[ 6.746720] Node 0 DMA free:15896kB min:32kB low:40kB high:48kB
active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB
unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15984kB
managed:15900kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB
shmem:0kB slab_reclaimable:0kB slab_unreclaimable:4kB kernel_stack:0kB
pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB
pages_scanned:0 all_unreclaimable? yes
[ 6.746725] lowmem_reserve[]: 0 3146 32125 32125
[ 6.746727] Node 0 DMA32 free:123128kB min:6616kB low:8268kB
high:9924kB active_anon:1508kB inactive_anon:0kB active_file:0kB
inactive_file:0kB unevictable:0kB isolated(anon):0kB
isolated(file):0kB present:3296400kB managed:3224152kB mlocked:0kB
dirty:0kB writeback:0kB mapped:4kB shmem:12kB slab_reclaimable:192kB
slab_unreclaimable:556kB kernel_stack:24kB pagetables:144kB
unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0
all_unreclaimable? yes
[ 6.746732] lowmem_reserve[]: 0 0 28978 28978
[ 6.746734] Node 0 Normal free:66532kB min:60932kB low:76164kB
high:91396kB active_anon:8404kB inactive_anon:76kB active_file:1084kB
inactive_file:1084kB unevictable:42632kB isolated(anon):0kB
isolated(file):0kB present:30136320kB managed:29673756kB mlocked:0kB
dirty:0kB writeback:0kB mapped:1308kB shmem:116kB
slab_reclaimable:4844kB slab_unreclaimable:13940kB kernel_stack:1088kB
pagetables:1816kB unstable:0kB bounce:0kB free_cma:0kB
writeback_tmp:0kB pages_scanned:192 all_unreclaimable? no
[ 6.746739] lowmem_reserve[]: 0 0 0 0
[ 6.746741] Node 0 DMA: 0*4kB 1*8kB (U) 1*16kB (U) 0*32kB 2*64kB
(U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB
(M) = 15896kB
[ 6.746750] Node 0 DMA32: 2*4kB (EM) 4*8kB (UEM) 1*16kB (U) 2*32kB
(E) 2*64kB (UM) 2*128kB (UM) 3*256kB (U) 6*512kB (UM) 6*1024kB (EM)
7*2048kB (UEMR) 24*4096kB (MR) = 123128kB
[ 6.746759] Node 0 Normal: 7*4kB (M) 15*8kB (UEM) 14*16kB (UM)
11*32kB (UEM) 3*64kB (UM) 1*128kB (M) 6*256kB (UE) 4*512kB (UEM)
4*1024kB (UM) 3*2048kB (UEM) 13*4096kB (MR) = 68116kB
[ 6.746770] Node 0 hugepages_total=0 hugepages_free=0
hugepages_surp=0 hugepages_size=2048kB
[ 6.746771] 11149 total pagecache pages
[ 6.746773] 0 pages in swap cache
[ 6.746774] Swap cache stats: add 0, delete 0, find 0/0
[ 6.746775] Free swap = 0kB
[ 6.746776] Total swap = 0kB
[ 6.814488] 8386047 pages RAM
[ 6.814490] 157595 pages reserved
[ 6.814491] 4560 pages shared
[ 6.814492] 8169064 pages non-shared
[ 6.814493] [ pid ] uid tgid total_vm rss nr_ptes swapents
oom_score_adj name
[ 6.814501] [ 90] 0 90 1202 159 8 0
0 udev
[ 6.814503] [ 92] 0 92 6261 340 17 0
-1000 systemd-udevd
[ 6.814505] [ 94] 0 94 6162 214 17 0
0 systemd-udevd
[ 6.814507] [ 96] 0 96 6228 238 17 0
0 systemd-udevd
[ 6.814508] [ 97] 0 97 6228 257 17 0
0 systemd-udevd
[ 6.814510] [ 99] 0 99 6228 238 17 0
0 systemd-udevd
[ 6.814512] [ 100] 0 100 6228 259 17 0
0 systemd-udevd
[ 6.814514] [ 101] 0 101 6228 258 17 0
0 systemd-udevd
[ 6.814516] [ 103] 0 103 6228 229 17 0
0 systemd-udevd
[ 6.814517] [ 105] 0 105 6228 222 17 0
0 systemd-udevd
[ 6.814519] [ 106] 0 106 6228 223 17 0
0 systemd-udevd
[ 6.814521] [ 107] 0 107 6228 232 17 0
0 systemd-udevd
[ 6.814523] [ 112] 0 112 6228 244 17 0
0 systemd-udevd
[ 6.814525] [ 113] 0 113 6228 244 17 0
0 systemd-udevd
[ 6.814526] [ 116] 0 116 6228 235 17 0
0 systemd-udevd
[ 6.814528] [ 117] 0 117 6228 241 17 0
0 systemd-udevd
[ 6.814530] [ 119] 0 119 5931 241 17 0
0 udevadm
[ 6.814532] [ 120] 0 120 6228 235 17 0
0 systemd-udevd
[ 6.814534] [ 121] 0 121 6228 235 17 0
0 systemd-udevd
[ 6.814535] [ 123] 0 123 6228 236 17 0
0 systemd-udevd
[ 6.814537] [ 126] 0 126 6228 236 17 0
0 systemd-udevd
[ 6.814539] [ 127] 0 127 6228 236 17 0
0 systemd-udevd
[ 6.814541] [ 129] 0 129 6228 236 17 0
0 systemd-udevd
[ 6.814542] [ 130] 0 130 6228 236 17 0
0 systemd-udevd
[ 6.814544] [ 133] 0 133 6228 236 17 0
0 systemd-udevd
[ 6.814546] [ 137] 0 137 6228 242 17 0
0 systemd-udevd
[ 6.814548] [ 139] 0 139 6228 243 17 0
0 systemd-udevd
[ 6.814552] [ 296] 0 296 1202 160 8 0
0 bcache-register
[ 6.814554] [ 319] 0 319 1202 160 8 0
0 bcache-register
[ 6.814556] Out of memory: Kill process 90 (udev) score 0 or sacrifice child
[ 6.814612] Killed process 119 (udevadm) total-vm:23724kB,
anon-rss:204kB, file-rss:760kB
[ 6.823222] bcache-register invoked oom-killer: gfp_mask=0x82d2,
order=0, oom_score_adj=0
[ 6.823226] bcache-register cpuset=/ mems_allowed=0
[ 6.823229] CPU: 1 PID: 296 Comm: bcache-register Not tainted 3.12.9 #1
Thanks,
Josep
--
--
Salutacions...Josep
--
--
--
Salutacions...Josep
--
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