Ubuntu
ktorrent package

Ktorrent locking the system

Asked by Evgeny Brazgin

seems to be a ktorrent problem. But also may be because of kernel, don't really know.

All works, but at some time X stops responding, mouse stops moving and I see the activity of hard disk (hdd led is on).
In /var/log/messages the following appears many times
:
Sep 12 20:17:47 xaptop kernel: [176880.392142] ktorrent D f38bbb5c 0 10352 1 0x00000000
Sep 12 20:17:47 xaptop kernel: [176880.392153] f38bbb6c 00000086 00000002 f38bbb5c 00011200 c05d8a20 c08c3700 c08c3700
Sep 12 20:17:47 xaptop kernel: [176880.392167] c3c9e1b6 0000a0c0 c08c3700 c08c3700 c3c62877 0000a0c0 00000000 c08c3700
Sep 12 20:17:47 xaptop kernel: [176880.392180] c08c3700 ea198000 00000001 ea198000 c2921700 f38bbbb8 f38bbb7c c05c69b1
Sep 12 20:17:47 xaptop kernel: [176880.392193] Call Trace:
Sep 12 20:17:47 xaptop kernel: [176880.392209] [<c05c69b1>] io_schedule+0x61/0xa0
Sep 12 20:17:47 xaptop kernel: [176880.392219] [<c023d668>] sync_buffer+0x38/0x40
Sep 12 20:17:47 xaptop kernel: [176880.392226] [<c05c717d>] __wait_on_bit+0x4d/0x70
Sep 12 20:17:47 xaptop kernel: [176880.392233] [<c023d630>] ? sync_buffer+0x0/0x40
Sep 12 20:17:47 xaptop kernel: [176880.392240] [<c023d630>] ? sync_buffer+0x0/0x40
Sep 12 20:17:47 xaptop kernel: [176880.392248] [<c05c724b>] out_of_line_wait_on_bit+0xab/0xc0
Sep 12 20:17:47 xaptop kernel: [176880.392257] [<c0165e60>] ? wake_bit_function+0x0/0x50
Sep 12 20:17:47 xaptop kernel: [176880.392264] [<c023d62e>] __wait_on_buffer+0x2e/0x30
Sep 12 20:17:47 xaptop kernel: [176880.392271] [<c023e602>] __bread+0x72/0xa0
Sep 12 20:17:47 xaptop kernel: [176880.392279] [<c0277d02>] ext3_get_branch+0x72/0xf0
Sep 12 20:17:47 xaptop kernel: [176880.392287] [<c0279763>] ext3_get_blocks_handle+0x83/0x4a0
Sep 12 20:17:47 xaptop kernel: [176880.392297] [<c033f842>] ? submit_bio+0x72/0x100
Sep 12 20:17:47 xaptop kernel: [176880.392304] [<c0279c30>] ext3_get_block+0xb0/0x100
Sep 12 20:17:47 xaptop kernel: [176880.392313] [<c0245af6>] do_mpage_readpage+0x1c6/0x730
Sep 12 20:17:47 xaptop kernel: [176880.392322] [<c01e2cd9>] ? ____pagevec_lru_add+0x179/0x190
Sep 12 20:17:47 xaptop kernel: [176880.392329] [<c01e2d37>] ? __lru_cache_add+0x47/0x60
Sep 12 20:17:47 xaptop kernel: [176880.392337] [<c01da07c>] ? add_to_page_cache_lru+0x5c/0x70
Sep 12 20:17:47 xaptop kernel: [176880.392345] [<c0246197>] mpage_readpages+0xc7/0x100
Sep 12 20:17:47 xaptop kernel: [176880.392352] [<c0279b80>] ? ext3_get_block+0x0/0x100
Sep 12 20:17:47 xaptop kernel: [176880.392361] [<c01dfcc9>] ? __alloc_pages_nodemask+0xd9/0x1c0
Sep 12 20:17:47 xaptop kernel: [176880.392368] [<c0278590>] ? ext3_readpages+0x0/0x20
Sep 12 20:17:47 xaptop kernel: [176880.392375] [<c02785ae>] ext3_readpages+0x1e/0x20
Sep 12 20:17:47 xaptop kernel: [176880.392382] [<c0279b80>] ? ext3_get_block+0x0/0x100
Sep 12 20:17:47 xaptop kernel: [176880.392390] [<c01e1f6c>] __do_page_cache_readahead+0x14c/0x210
Sep 12 20:17:47 xaptop kernel: [176880.392398] [<c01e2056>] ra_submit+0x26/0x30
Sep 12 20:17:47 xaptop kernel: [176880.392406] [<c01db75f>] filemap_fault+0x3cf/0x400
Sep 12 20:17:47 xaptop kernel: [176880.392413] [<c035a1d9>] ? copy_to_user+0x39/0x130
Sep 12 20:17:47 xaptop kernel: [176880.392422] [<c01f25a0>] __do_fault+0x40/0x570
Sep 12 20:17:47 xaptop kernel: [176880.392429] [<c01f4566>] handle_mm_fault+0x146/0x400
Sep 12 20:17:47 xaptop kernel: [176880.392438] [<c0546a40>] ? udp_ioctl+0x0/0x80
Sep 12 20:17:47 xaptop kernel: [176880.392447] [<c05cbed6>] do_page_fault+0x146/0x440
Sep 12 20:17:47 xaptop kernel: [176880.392456] [<c04e7d35>] ? sys_socketcall+0x175/0x2a0
Sep 12 20:17:47 xaptop kernel: [176880.392464] [<c05cbd90>] ? do_page_fault+0x0/0x440
Sep 12 20:17:47 xaptop kernel: [176880.392471] [<c05c9307>] error_code+0x73/0x78
Sep 12 20:17:47 xaptop kernel: [176880.392479] [<c05c0000>] ? identify_cpu+0xc4/0x229

Sometimes info about memory is shown:
Sep 12 20:23:32 xaptop kernel: [177192.740206] Mem-Info:
Sep 12 20:23:32 xaptop kernel: [177192.740210] DMA per-cpu:
Sep 12 20:23:32 xaptop kernel: [177192.740215] CPU 0: hi: 0, btch: 1 usd: 0
Sep 12 20:23:32 xaptop kernel: [177192.740221] CPU 1: hi: 0, btch: 1 usd: 0
Sep 12 20:23:32 xaptop kernel: [177192.740225] Normal per-cpu:
Sep 12 20:23:32 xaptop kernel: [177192.740230] CPU 0: hi: 186, btch: 31 usd: 178
Sep 12 20:23:32 xaptop kernel: [177192.740235] CPU 1: hi: 186, btch: 31 usd: 143
Sep 12 20:23:32 xaptop kernel: [177192.740239] HighMem per-cpu:
Sep 12 20:23:32 xaptop kernel: [177192.740244] CPU 0: hi: 186, btch: 31 usd: 135
Sep 12 20:23:32 xaptop kernel: [177192.740249] CPU 1: hi: 186, btch: 31 usd: 117
Sep 12 20:23:32 xaptop kernel: [177192.740260] active_anon:298847 inactive_anon:156151 isolated_anon:2336
Sep 12 20:23:32 xaptop kernel: [177192.740263] active_file:356 inactive_file:737 isolated_file:0
Sep 12 20:23:32 xaptop kernel: [177192.740266] unevictable:0 dirty:2 writeback:237 unstable:0
Sep 12 20:23:32 xaptop kernel: [177192.740269] free:11818 slab_reclaimable:5084 slab_unreclaimable:19326
Sep 12 20:23:32 xaptop kernel: [177192.740272] mapped:5928 shmem:25602 pagetables:4420 bounce:0
Sep 12 20:23:32 xaptop kernel: [177192.740287] DMA free:6612kB min:64kB low:80kB high:96kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15804kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:136kB slab_unreclaimable:104kB kernel_stack:16kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
Sep 12 20:23:32 xaptop kernel: [177192.740299] lowmem_reserve[]: 0 865 2006 2006
Sep 12 20:23:32 xaptop kernel: [177192.740319] Normal free:40204kB min:3728kB low:4660kB high:5592kB active_anon:338836kB inactive_anon:339044kB active_file:612kB inactive_file:1044kB unevictable:0kB isolated(anon):768kB isolated(file):0kB present:885944kB mlocked:0kB dirty:0kB writeback:212kB mapped:8760kB shmem:46044kB slab_reclaimable:20200kB slab_unreclaimable:77200kB kernel_stack:3824kB pagetables:4612kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:224 all_unreclaimable? no
Sep 12 20:23:32 xaptop kernel: [177192.740333] lowmem_reserve[]: 0 0 9134 9134
Sep 12 20:23:32 xaptop kernel: [177192.740351] HighMem free:456kB min:512kB low:1740kB high:2972kB active_anon:856552kB inactive_anon:285560kB active_file:812kB inactive_file:1904kB unevictable:0kB isolated(anon):8576kB isolated(file):0kB present:1169168kB mlocked:0kB dirty:8kB writeback:736kB mapped:14952kB shmem:56364kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:13068kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:352 all_unreclaimable? no
Sep 12 20:23:32 xaptop kernel: [177192.740365] lowmem_reserve[]: 0 0 0 0
Sep 12 20:23:32 xaptop kernel: [177192.740372] DMA: 7*4kB 21*8kB 17*16kB 14*32kB 11*64kB 11*128kB 6*256kB 2*512kB 1*1024kB 0*2048kB 0*4096kB = 6612kB
Sep 12 20:23:32 xaptop kernel: [177192.740393] Normal: 9299*4kB 6*8kB 1*16kB 6*32kB 5*64kB 1*128kB 1*256kB 0*512kB 0*1024kB 1*2048kB 0*4096kB = 40204kB
Sep 12 20:23:32 xaptop kernel: [177192.740414] HighMem: 22*4kB 4*8kB 11*16kB 5*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 456kB
Sep 12 20:23:32 xaptop kernel: [177192.740435] 36030 total pagecache pages
Sep 12 20:23:32 xaptop kernel: [177192.740439] 9304 pages in swap cache
Sep 12 20:23:32 xaptop kernel: [177192.740444] Swap cache stats: add 770325, delete 761021, find 698606/719042
Sep 12 20:23:32 xaptop kernel: [177192.740449] Free swap = 0kB
Sep 12 20:23:32 xaptop kernel: [177192.740452] Total swap = 2008120kB
Sep 12 20:23:32 xaptop kernel: [177192.753276] 521904 pages RAM
Sep 12 20:23:32 xaptop kernel: [177192.753282] 294594 pages HighMem
Sep 12 20:23:32 xaptop kernel: [177192.753286] 9235 pages reserved
Sep 12 20:23:32 xaptop kernel: [177192.753289] 21326 pages shared
Sep 12 20:23:32 xaptop kernel: [177192.753293] 486620 pages non-shared

It seems, that the memory and swap are fully filled.
After some time (10-20 minutes) X restarts and everything goes ok.
Maybe it's kernel's problem, but this lines always appear with "ktorrent D f38bbb5c 0 10352 1 0x00000000" before.
I suppose, I'd file a bug to ktorrent or kernel, but not sure.
What should I better do?

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Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#1

I'd log a bug. If you rename the ktorrent config folder(s) then rerun it (giving vanilla settings) does it run ok?

Revision history for this message
Evgeny Brazgin (xapienz) said : 		#2

ktorrent runs ok.
The bug isn't reproducible always. I even don't know what should happen before appearing.
It may have gone some days of ktorrent running before freezing.

Revision history for this message
actionparsnip (andrew-woodhead666) said : 		#3

I'd log a bug

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