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Message-ID: <AANLkTi=3MvH1M7GyZQh9r+hvE88Y03+3bKUGM05Dxcmk@mail.gmail.com> Date: Thu, 18 Nov 2010 23:36:22 +0100 From: richard -rw- weinberger <richard.weinberger@...il.com> To: Ondřej Kunc <ondra@...l.eu> Cc: linux-ext4@...r.kernel.org, user-mode-linux-devel@...ts.sourceforge.net Subject: Re: [uml-devel] Ext4 in user mode linux hang 2010/11/18 Ondřej Kunc <ondra@...l.eu>: > Hi, > > the same test with ext3 runs without problem about a hour, with ext4 it > hangs quickly ... latest hang from all tests was when it filled the > partition (2GB) with data. How long does it take until it hangs? Your test runs fine on my testbed. > Dne 18.11.2010 20:55, richard -rw- weinberger napsal(a): >> >> 2010/11/18 Ondřej Kunc<ondra@...l.eu>: >> >>> >>> Hi, >>> >>> on vanilla kernel (2.6.36 from kernel.org) ... it fails too(so it is not >>> debian specific), traces from sysrq t (via uml_mconsole) >>> >> >> Does it only happen with ext4? >> >> >>> >>> (only processess in D state): >>> >>> jbd2/ubdb-8 D 00000000405068b3 0 580 2 0x00000000 >>> 66aea608 660214c8 66021038 60284440 66041cb0 60013597 66aea140 66040000 >>> 66040000 66aea140 66041d10 601d3381 679ac2d0 66bcb8a8 66041d10 >>> 66040000 >>> 00000000 66bcb800 67453a80 1000014a0 66040000 67453b18 66041e50 >>> 60122f6f >>> Call Trace: >>> 66041c88: [<60013597>] _switch_to+0x5e/0xae >>> 66041cb8: [<601d3381>] schedule+0x274/0x2ae >>> 66041d18: [<60122f6f>] jbd2_journal_commit_transaction+0x16c/0xe59 >>> 66041d98: [<600245e3>] switch_threads+0x2d/0x3d >>> 66041de0: [<60042f46>] autoremove_wake_function+0x0/0x34 >>> 66041e58: [<6012635c>] kjournald2+0xb8/0x1bb >>> 66041e90: [<60042f46>] autoremove_wake_function+0x0/0x34 >>> 66041eb0: [<601262a4>] kjournald2+0x0/0x1bb >>> 66041ed0: [<601262a4>] kjournald2+0x0/0x1bb >>> 66041ee8: [<60042c9d>] kthread+0x91/0x99 >>> 66041f48: [<60021329>] run_kernel_thread+0x41/0x4a >>> 66041f58: [<60042c0c>] kthread+0x0/0x99 >>> 66041f98: [<60021310>] run_kernel_thread+0x28/0x4a >>> 66041fc8: [<6001350f>] new_thread_handler+0x71/0x9b >>> >>> flush-98:16 D 00000000405068b3 0 609 2 0x00000000 >>> 660214c8 608dec08 608de778 60284440 6613b9d0 60013597 66021000 6613a000 >>> 6613a000 66021000 6613ba30 601d3381 6613b9f0 6002a34f 6613ba30 >>> 6613a000 >>> 76800000767 66021000 63474428 00000002 0000ffff 63474440 6613ba90 >>> 601d45a2 >>> Call Trace: >>> 6613b9a8: [<60013597>] _switch_to+0x5e/0xae >>> 6613b9d8: [<601d3381>] schedule+0x274/0x2ae >>> 6613b9e8: [<6002a34f>] wake_up_process+0x10/0x12 >>> 6613ba38: [<601d45a2>] rwsem_down_failed_common+0xb8/0xd8 >>> 6613ba98: [<601d45d5>] rwsem_down_write_failed+0x13/0x15 >>> 6613baa8: [<60027bbb>] call_rwsem_down_write_failed+0x13/0x20 >>> 6613bae8: [<601d3db5>] down_write+0x1c/0x1e >>> 6613baf8: [<6010053a>] mpage_da_map_blocks+0x308/0x359 >>> 6613bb68: [<60100ce7>] ext4_da_writepages+0x2f7/0x479 >>> 6613bc58: [<6005b236>] do_writepages+0x1c/0x25 >>> 6613bc68: [<60090ab0>] writeback_single_inode+0x93/0x1d4 >>> 6613bc98: [<60090e42>] writeback_sb_inodes+0xa1/0xfe >>> 6613bcf8: [<60091558>] writeback_inodes_wb+0xc5/0xe4 >>> 6613bd00: [<60042f7a>] wake_bit_function+0x0/0x2e >>> 6613bd48: [<600916e6>] wb_writeback+0x16f/0x1de >>> 6613bda8: [<601d3389>] schedule+0x27c/0x2ae >>> 6613bdf8: [<60091868>] wb_do_writeback+0x113/0x130 >>> 6613be08: [<601d3600>] schedule_timeout+0x13e/0x15c >>> 6613be78: [<6009190e>] bdi_writeback_thread+0x89/0x13f >>> 6613beb0: [<60091885>] bdi_writeback_thread+0x0/0x13f >>> 6613bed0: [<60091885>] bdi_writeback_thread+0x0/0x13f >>> 6613bee8: [<60042c9d>] kthread+0x91/0x99 >>> 6613bf48: [<60021329>] run_kernel_thread+0x41/0x4a >>> 6613bf58: [<60042c0c>] kthread+0x0/0x99 >>> 6613bf98: [<60021310>] run_kernel_thread+0x28/0x4a >>> 6613bfc8: [<6001350f>] new_thread_handler+0x71/0x9b >>> >>> dd D 00000000405068b3 0 18357 922 0x00000000 >>> 608dec08 60276e98 6087b8c0 6002a1ed 6087b8d0 60013597 608de740 6087a000 >>> 6087a000 608de740 6087b930 601d3381 6087b930 601d7480 6087b930 >>> 6087a000 >>> 816087b920 66bcb800 00000000 67453a80 6087a000 6087b998 6087b9e0 >>> 60122942 >>> Call Trace: >>> 6087b898: [<6002a1ed>] dequeue_task+0x39/0x48 >>> 6087b8a8: [<60013597>] _switch_to+0x5e/0xae >>> 6087b8d8: [<601d3381>] schedule+0x274/0x2ae >>> 6087b938: [<60122942>] start_this_handle+0x2f4/0x395 >>> 6087b990: [<60042f46>] autoremove_wake_function+0x0/0x34 >>> 6087b9e8: [<60122b70>] jbd2__journal_start+0xb9/0xf7 >>> 6087ba38: [<60122bbc>] jbd2_journal_start+0xe/0x10 >>> 6087ba48: [<6010add9>] ext4_journal_start_sb+0xe0/0x125 >>> 6087ba78: [<60015daf>] buffer_op+0xab/0xc7 >>> 6087baa8: [<600ffbf6>] ext4_da_write_begin+0xc1/0x1b4 >>> 6087bb28: [<60054e94>] generic_file_buffered_write+0x124/0x27e >>> 6087bbc8: [<60088a92>] file_update_time+0x3b/0xfe >>> 6087bc18: [<60056828>] __generic_file_aio_write+0x380/0x3bf >>> 6087bcd8: [<600568bf>] generic_file_aio_write+0x58/0xa2 >>> 6087bd18: [<600f80fb>] ext4_file_write+0x92/0xa3 >>> 6087bd48: [<60077c1b>] do_sync_write+0xd1/0x10e >>> 6087bdb8: [<60015daf>] buffer_op+0xab/0xc7 >>> 6087be68: [<600785ef>] vfs_write+0xb5/0x169 >>> 6087bea8: [<6007875c>] sys_write+0x45/0x6c >>> 6087bee8: [<60015ab8>] handle_syscall+0x58/0x70 >>> 6087bf08: [<60024ecb>] userspace+0x2dd/0x38a >>> 6087bfc8: [<60013497>] fork_handler+0x62/0x69 >>> >>> Dne 18.11.2010 19:35, richard -rw- weinberger napsal(a): >>> >>>> >>>> 2010/11/18 Lukas Czerner<lczerner@...hat.com>: >>>> >>>> >>>>> >>>>> On Thu, 18 Nov 2010, Ondřej Kunc wrote: >>>>> >>>>> >>>>> >>>>>> >>>>>> Hi, >>>>>> >>>>>> I've recently tested ext4 in user mode linux VM. I compiled linux >>>>>> 2.6.36(from >>>>>> debian source package). I configured kernel this way ... only disabled >>>>>> modules >>>>>> (to work with default debootstraped debian). Then I created this >>>>>> script: >>>>>> >>>>>> >>>> >>>> Can you reproduce this on a vanilla kernel? >>>> >>>> >>>> >>>>>> >>>>>> #!/bin/bash >>>>>> DD="dd if=/dev/zero bs=1k" >>>>>> for i in `seq 1 1000`; do >>>>>> A=$(($RANDOM%50000)) >>>>>> $DD count=$A of=frag_$A >>>>>> for i in `seq 1 100`; do >>>>>> A=$(($RANDOM%50000)) >>>>>> rm -f frag_$A >>>>>> done >>>>>> done >>>>>> >>>>>> >>>>>> This script I'had run on mounted ext4 partition (/dev/ubda -> >>>>>> /mnt/test). It's >>>>>> purpose is creating fragmented filesystem to test e4defrag. But after >>>>>> some >>>>>> time it hungs the whole virtual system. All processes which want to >>>>>> write to >>>>>> /mnt/test are still in D state. I issued sysrq t via uml_mconsole and >>>>>> in >>>>>> that >>>>>> output I found traces below. >>>>>> >>>>>> Ondra >>>>>> >>>>>> >>>>> >>>>> I did not look at the traces closely, but did you tried another >>>>> filesystem ? My experience with UML is that it is always broken so the >>>>> problem might as well be somewhere else. >>>>> >>>>> -Lukas >>>>> >>>>> >>>>> >>>>>> >>>>>> flush-98:16 D 0000000041a0d8b3 0 811 2 0x00000000 >>>>>> 67c57d80 60276e90 69857980 6002a1ed 69857990 60013597 67c578c0 >>>>>> 69856000 >>>>>> 69856000 67c578c0 698579f0 601d3181 69857a10 601d74a0 698579f0 >>>>>> 69856000 >>>>>> ffffffff00000a57 62e09800 00000000 69ab1480 69856000 69857a58 >>>>>> 69857aa0 >>>>>> 6012274e >>>>>> Call Trace: >>>>>> 69857958: [<6002a1ed>] dequeue_task+0x39/0x48 >>>>>> 69857968: [<60013597>] _switch_to+0x5e/0xae >>>>>> 69857998: [<601d3181>] schedule+0x274/0x2ae >>>>>> 698579f8: [<6012274e>] start_this_handle+0x2f4/0x395 >>>>>> 69857a50: [<60042f42>] autoremove_wake_function+0x0/0x34 >>>>>> 69857aa8: [<6012297c>] jbd2__journal_start+0xb9/0xf7 >>>>>> 69857af8: [<601229c8>] jbd2_journal_start+0xe/0x10 >>>>>> 69857b08: [<6010abe5>] ext4_journal_start_sb+0xe0/0x125 >>>>>> 69857b28: [<600fa802>] ext4_meta_trans_blocks+0x5b/0xaf >>>>>> 69857b68: [<60100a43>] ext4_da_writepages+0x249/0x479 >>>>>> 69857c58: [<6005b042>] do_writepages+0x1c/0x25 >>>>>> 69857c68: [<600908bc>] writeback_single_inode+0x93/0x1d4 >>>>>> 69857c98: [<60090c4e>] writeback_sb_inodes+0xa1/0xfe >>>>>> 69857cf8: [<60091364>] writeback_inodes_wb+0xc5/0xe4 >>>>>> 69857d00: [<60042f76>] wake_bit_function+0x0/0x2e >>>>>> 69857d48: [<600914f2>] wb_writeback+0x16f/0x1de >>>>>> 69857da8: [<601d3189>] schedule+0x27c/0x2ae >>>>>> 69857df8: [<60091674>] wb_do_writeback+0x113/0x130 >>>>>> 69857e08: [<601d3400>] schedule_timeout+0x13e/0x15c >>>>>> 69857e78: [<6009171a>] bdi_writeback_thread+0x89/0x13f >>>>>> 69857eb0: [<60091691>] bdi_writeback_thread+0x0/0x13f >>>>>> 69857ed0: [<60091691>] bdi_writeback_thread+0x0/0x13f >>>>>> 69857ee8: [<60042c99>] kthread+0x91/0x99 >>>>>> 69857f48: [<60021329>] run_kernel_thread+0x41/0x4a >>>>>> 69857f58: [<60042c08>] kthread+0x0/0x99 >>>>>> 69857f98: [<60021310>] run_kernel_thread+0x28/0x4a >>>>>> 69857fc8: [<6001350f>] new_thread_handler+0x71/0x9b >>>>>> >>>>>> jbd2/ubdb-8 D 0000000041a0d8b3 0 4542 2 0x00000000 >>>>>> 6838d640 60276e90 68275ca0 6002a1ed 68275cb0 60013597 6838d180 >>>>>> 68274000 >>>>>> 68274000 6838d180 68275d10 601d3181 68fd7470 601d74a0 68275d10 >>>>>> 68274000 >>>>>> 00000000 62e09800 69ab1480 1000077f1 68274000 69ab1518 68275e50 >>>>>> 60122d7b >>>>>> Call Trace: >>>>>> 68275c78: [<6002a1ed>] dequeue_task+0x39/0x48 >>>>>> 68275c88: [<60013597>] _switch_to+0x5e/0xae >>>>>> 68275cb8: [<601d3181>] schedule+0x274/0x2ae >>>>>> 68275d18: [<60122d7b>] jbd2_journal_commit_transaction+0x16c/0xe59 >>>>>> 68275d98: [<600245e3>] switch_threads+0x2d/0x3d >>>>>> 68275de0: [<60042f42>] autoremove_wake_function+0x0/0x34 >>>>>> 68275df8: [<600222bb>] set_signals+0x1c/0x2e >>>>>> 68275e18: [<60043094>] finish_wait+0x64/0x6f >>>>>> 68275e58: [<60126168>] kjournald2+0xb8/0x1bb >>>>>> 68275e90: [<60042f42>] autoremove_wake_function+0x0/0x34 >>>>>> 68275eb0: [<601260b0>] kjournald2+0x0/0x1bb >>>>>> 68275ed0: [<601260b0>] kjournald2+0x0/0x1bb >>>>>> 68275ee8: [<60042c99>] kthread+0x91/0x99 >>>>>> 68275f48: [<60021329>] run_kernel_thread+0x41/0x4a >>>>>> 68275f58: [<60042c08>] kthread+0x0/0x99 >>>>>> 68275f98: [<60021310>] run_kernel_thread+0x28/0x4a >>>>>> 68275fc8: [<6001350f>] new_thread_handler+0x71/0x9b >>>>>> >>>>>> dd D 0000000041a0d8b3 0 4952 4593 0x00000000 >>>>>> 6838c8c0 67c57d80 67c578f8 60284440 69b6d7a8 60013597 6838c400 >>>>>> 69b6c000 >>>>>> 69b6c000 6838c400 69b6d808 601d3181 69b6d7c8 6002a34f 69b6d808 >>>>>> 69b6c000 >>>>>> 00001000 6838c400 696c0838 00000001 ffffffffffffffff 00000000 >>>>>> 69b6d868 >>>>>> 601d43a2 >>>>>> Call Trace: >>>>>> 69b6d780: [<60013597>] _switch_to+0x5e/0xae >>>>>> 69b6d7b0: [<601d3181>] schedule+0x274/0x2ae >>>>>> 69b6d7c0: [<6002a34f>] wake_up_process+0x10/0x12 >>>>>> 69b6d810: [<601d43a2>] rwsem_down_failed_common+0xb8/0xd8 >>>>>> 69b6d838: [<600222bb>] set_signals+0x1c/0x2e >>>>>> 69b6d870: [<601d43e9>] rwsem_down_read_failed+0x12/0x14 >>>>>> 69b6d880: [<60027b98>] call_rwsem_down_read_failed+0x14/0x24 >>>>>> 69b6d8c8: [<601d3b97>] down_read+0x11/0x13 >>>>>> 69b6d8d8: [<600fe1cc>] ext4_map_blocks+0x3e/0x18e >>>>>> 69b6d938: [<600ffe02>] ext4_da_get_block_prep+0x83/0x2bd >>>>>> 69b6d958: [<60095705>] alloc_buffer_head+0x18/0x6c >>>>>> 69b6d968: [<60095d31>] alloc_page_buffers+0x75/0xd1 >>>>>> 69b6d9d8: [<60097105>] block_prepare_write+0x177/0x380 >>>>>> 69b6d9e8: [<6005588b>] add_to_page_cache_locked+0xbf/0xe7 >>>>>> 69b6da00: [<600ffd7f>] ext4_da_get_block_prep+0x0/0x2bd >>>>>> 69b6da98: [<600973f3>] __block_write_begin+0x12/0x14 >>>>>> 69b6daa8: [<600ffa62>] ext4_da_write_begin+0x123/0x1b4 >>>>>> 69b6db28: [<60054ca0>] generic_file_buffered_write+0x124/0x27e >>>>>> 69b6dbc8: [<6008889e>] file_update_time+0x3b/0xfe >>>>>> 69b6dc18: [<60056634>] __generic_file_aio_write+0x380/0x3bf >>>>>> 69b6dcd8: [<600566cb>] generic_file_aio_write+0x58/0xa2 >>>>>> 69b6dd18: [<600f7f07>] ext4_file_write+0x92/0xa3 >>>>>> 69b6dd48: [<60077a27>] do_sync_write+0xd1/0x10e >>>>>> 69b6ddb8: [<60015daf>] buffer_op+0xab/0xc7 >>>>>> 69b6de68: [<600783fb>] vfs_write+0xb5/0x169 >>>>>> 69b6dea8: [<60078568>] sys_write+0x45/0x6c >>>>>> 69b6dee8: [<60015ab8>] handle_syscall+0x58/0x70 >>>>>> 69b6df08: [<60024ecb>] userspace+0x2dd/0x38a >>>>>> 69b6dfc8: [<60013497>] fork_handler+0x62/0x69 >>>>>> >>>>>> bash D 0000000041a0d8b3 0 5324 5271 0x00000002 >>>>>> 67e2c540 60276e90 67dcfbd0 6002a1ed 67dcfbe0 60013597 67e2c080 >>>>>> 67dce000 >>>>>> 67dce000 67e2c080 67dcfc40 601d3181 62a31000 601d74a0 67dcfc40 >>>>>> 67dce000 >>>>>> 67dcfc10 62e09800 00000000 69ab1480 67dce000 67dcfca8 67dcfcf0 >>>>>> 6012274e >>>>>> Call Trace: >>>>>> 67dcfba8: [<6002a1ed>] dequeue_task+0x39/0x48 >>>>>> 67dcfbb8: [<60013597>] _switch_to+0x5e/0xae >>>>>> 67dcfbe8: [<601d3181>] schedule+0x274/0x2ae >>>>>> 67dcfc48: [<6012274e>] start_this_handle+0x2f4/0x395 >>>>>> 67dcfca0: [<60042f42>] autoremove_wake_function+0x0/0x34 >>>>>> 67dcfcf8: [<6012297c>] jbd2__journal_start+0xb9/0xf7 >>>>>> 67dcfd48: [<601229c8>] jbd2_journal_start+0xe/0x10 >>>>>> 67dcfd58: [<6010abe5>] ext4_journal_start_sb+0xe0/0x125 >>>>>> 67dcfd60: [<6008424f>] filldir+0x0/0x11a >>>>>> 67dcfdb8: [<600fb08a>] ext4_dirty_inode+0x1b/0x48 >>>>>> 67dcfdd8: [<60091027>] __mark_inode_dirty+0x29/0x199 >>>>>> 67dcfdf8: [<60088a63>] touch_atime+0x102/0x125 >>>>>> 67dcfe38: [<6008424f>] filldir+0x0/0x11a >>>>>> 67dcfe48: [<600844fd>] vfs_readdir+0x7a/0xa1 >>>>>> 67dcfe98: [<6008469d>] sys_getdents+0x90/0x124 >>>>>> 67dcfee8: [<60015ab8>] handle_syscall+0x58/0x70 >>>>>> 67dcff08: [<60024ecb>] userspace+0x2dd/0x38a >>>>>> 67dcffc8: [<60013497>] fork_handler+0x62/0x69 >>>>>> >>>>>> >>>>>> >>>>>> >>>>> >>>>> >>>>> ------------------------------------------------------------------------------ >>>>> Beautiful is writing same markup. Internet Explorer 9 supports >>>>> standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2& L3. >>>>> Spend less time writing and rewriting code and more time creating >>>>> great >>>>> experiences on the web. Be a part of the beta today >>>>> http://p.sf.net/sfu/msIE9-sfdev2dev >>>>> _______________________________________________ >>>>> User-mode-linux-devel mailing list >>>>> User-mode-linux-devel@...ts.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> >>> >>> -- >>> Ondřej Kunc >>> >>> správce serverové farmy >>> CZOL media interactive s.r.o. >>> Sídlo: Moulíkova 2238/1, Praha 5, 15000 >>> Kanceláře: Na Moráni 5357, Chomutov, 43001 >>> Telefon: +420 723 137 981 >>> E-mail: ondra@...l.eu >>> URL: www.czol.eu, www.cz-hosting.com >>> >>> >>> >> >> >> > > > -- > Ondřej Kunc > > správce serverové farmy > CZOL media interactive s.r.o. > Sídlo: Moulíkova 2238/1, Praha 5, 15000 > Kanceláře: Na Moráni 5357, Chomutov, 43001 > Telefon: +420 723 137 981 > E-mail: ondra@...l.eu > URL: www.czol.eu, www.cz-hosting.com > > -- Thanks, //richard -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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