[uml-devel] Ext4 in user mode linux hang

[uml-devel] Ext4 in user mode linux hang

[Ondřej Kunc]

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:

#!/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



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

-- 
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@czol.eu
URL: www.czol.eu, www.cz-hosting.com


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Re: [uml-devel] Ext4 in user mode linux hang

[Lukas Czerner]

[-- Attachment #1: Type: TEXT/PLAIN, Size: 7375 bytes --]

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:
> 
> #!/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
> 
> 

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Re: [uml-devel] Ext4 in user mode linux hang

[richard -rw- weinberger]

2010/11/18 Lukas Czerner <lczerner@redhat.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
>>
>>
> ------------------------------------------------------------------------------
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> Spend less time writing and  rewriting code and more time creating great
> experiences on the web. Be a part of the beta today
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>



-- 
Thanks,
//richard

------------------------------------------------------------------------------
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Spend less time writing and  rewriting code and more time creating great
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Re: [uml-devel] Ext4 in user mode linux hang

[Ondřej Kunc]

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)

(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@redhat.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@lists.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@czol.eu
URL: www.czol.eu, www.cz-hosting.com


------------------------------------------------------------------------------
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
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https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Ext4 in user mode linux hang

[richard -rw- weinberger]

2010/11/18 Ondřej Kunc <ondra@czol.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@redhat.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@lists.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@czol.eu
> URL: www.czol.eu, www.cz-hosting.com
>
>



-- 
Thanks,
//richard

------------------------------------------------------------------------------
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@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Ext4 in user mode linux hang

[Ondřej Kunc]

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.

Dne 18.11.2010 20:55, richard -rw- weinberger napsal(a):
> 2010/11/18 Ondřej Kunc<ondra@czol.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@redhat.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@lists.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@czol.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@czol.eu
URL: www.czol.eu, www.cz-hosting.com


------------------------------------------------------------------------------
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@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel

Re: [uml-devel] Ext4 in user mode linux hang

[richard -rw- weinberger]

2010/11/18 Ondřej Kunc <ondra@czol.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@czol.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@redhat.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@lists.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@czol.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@czol.eu
> URL: www.czol.eu, www.cz-hosting.com
>
>



-- 
Thanks,
//richard

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