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@xxxxxxxxxx>:
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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Ondřej Kunc
správce serverové farmy
CZOL media interactive s.r.o.
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