Hi, nilfs seems to have some dead-locks that put processes in D-state (at least on my arm system). This time around it seems that syslog-ng has been hit first. The previous times it most often was collectd/rrdtool. Kernel is vanilla 2.6.31.4 + a patch for USB HID device. System is arm, Feroceon 88FR131, SheevaPlug. nilfs is being used on a SD card (mmcblk0: mmc0:bc20 SD08G 7.60 GiB, mvsdio driver) Bruno Extracts from dmesg (less attempting to read a logfile produced by syslog-ng): INFO: task less:15839 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. less D c02c8610 0 15839 1742 0x00000001 [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c9318>] (__mutex_lock_slowpath+0x88/0x140) [<c02c9318>] (__mutex_lock_slowpath+0x88/0x140) from [<c009833c>] (generic_file_llseek+0x24/0x64) [<c009833c>] (generic_file_llseek+0x24/0x64) from [<c0096d74>] (vfs_llseek+0x54/0x64) [<c0096d74>] (vfs_llseek+0x54/0x64) from [<c00981c8>] (sys_llseek+0x74/0xcc) [<c00981c8>] (sys_llseek+0x74/0xcc) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) All stuck processes as listed by SysRq + T: syslog-ng D c02c8610 0 1698 1 0x00000000 [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c8e60>] (schedule_timeout+0x14c/0x1e8) [<c02c8e60>] (schedule_timeout+0x14c/0x1e8) from [<c02c8344>] (io_schedule_timeout+0x34/0x58) [<c02c8344>] (io_schedule_timeout+0x34/0x58) from [<c007caf0>] (congestion_wait+0x5c/0x80) [<c007caf0>] (congestion_wait+0x5c/0x80) from [<c0070fb0>] (balance_dirty_pages_ratelimited_nr+0xe8/0x290) [<c0070fb0>] (balance_dirty_pages_ratelimited_nr+0xe8/0x290) from [<c0069f04>] (generic_file_buffered_write+0x10c/0x348) [<c0069f04>] (generic_file_buffered_write+0x10c/0x348) from [<c006a64c>] (__generic_file_aio_write_nolock+0x264/0x4f4) [<c006a64c>] (__generic_file_aio_write_nolock+0x264/0x4f4) from [<c006b3b8>] (generic_file_aio_write+0x74/0xe8) [<c006b3b8>] (generic_file_aio_write+0x74/0xe8) from [<c0097228>] (do_sync_write+0xbc/0x100) [<c0097228>] (do_sync_write+0xbc/0x100) from [<c0097d3c>] (vfs_write+0xb0/0x164) [<c0097d3c>] (vfs_write+0xb0/0x164) from [<c0097ec0>] (sys_write+0x40/0x70) [<c0097ec0>] (sys_write+0x40/0x70) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) less D c02c8610 0 15839 1742 0x00000001 [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c9318>] (__mutex_lock_slowpath+0x88/0x140) [<c02c9318>] (__mutex_lock_slowpath+0x88/0x140) from [<c009833c>] (generic_file_llseek+0x24/0x64) [<c009833c>] (generic_file_llseek+0x24/0x64) from [<c0096d74>] (vfs_llseek+0x54/0x64) [<c0096d74>] (vfs_llseek+0x54/0x64) from [<c00981c8>] (sys_llseek+0x74/0xcc) [<c00981c8>] (sys_llseek+0x74/0xcc) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) sshd D c02c8610 0 15844 15842 0x00000001 [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c8e60>] (schedule_timeout+0x14c/0x1e8) [<c02c8e60>] (schedule_timeout+0x14c/0x1e8) from [<c02c8344>] (io_schedule_timeout+0x34/0x58) [<c02c8344>] (io_schedule_timeout+0x34/0x58) from [<c007caf0>] (congestion_wait+0x5c/0x80) [<c007caf0>] (congestion_wait+0x5c/0x80) from [<c0070fb0>] (balance_dirty_pages_ratelimited_nr+0xe8/0x290) [<c0070fb0>] (balance_dirty_pages_ratelimited_nr+0xe8/0x290) from [<c0069f04>] (generic_file_buffered_write+0x10c/0x348) [<c0069f04>] (generic_file_buffered_write+0x10c/0x348) from [<c006a64c>] (__generic_file_aio_write_nolock+0x264/0x4f4) [<c006a64c>] (__generic_file_aio_write_nolock+0x264/0x4f4) from [<c006b3b8>] (generic_file_aio_write+0x74/0xe8) [<c006b3b8>] (generic_file_aio_write+0x74/0xe8) from [<c0097228>] (do_sync_write+0xbc/0x100) [<c0097228>] (do_sync_write+0xbc/0x100) from [<c0097d3c>] (vfs_write+0xb0/0x164) [<c0097d3c>] (vfs_write+0xb0/0x164) from [<c0097ec0>] (sys_write+0x40/0x70) [<c0097ec0>] (sys_write+0x40/0x70) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) nilfs related processes: [40049.761881] segctord S c02c8610 0 859 2 0x00000000 [40049.761894] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) [40049.761999] [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) from [<c004aac0>] (kthread+0x7c/0x84) [40049.762081] [<c004aac0>] (kthread+0x7c/0x84) from [<c0023940>] (kernel_thread_exit+0x0/0x8) [40049.762101] nilfs_cleaner S c02c8610 0 860 1 0x00000000 [40049.762115] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c99f4>] (do_nanosleep+0xb0/0x110) [40049.762137] [<c02c99f4>] (do_nanosleep+0xb0/0x110) from [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) [40049.762161] [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) from [<c004eff4>] (sys_nanosleep+0x9c/0xa4) [40049.762181] [<c004eff4>] (sys_nanosleep+0x9c/0xa4) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) [40049.762201] segctord S c02c8610 0 862 2 0x00000000 [40049.762214] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) [40049.762298] [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) from [<c004aac0>] (kthread+0x7c/0x84) [40049.762377] [<c004aac0>] (kthread+0x7c/0x84) from [<c0023940>] (kernel_thread_exit+0x0/0x8) [40049.762397] nilfs_cleaner S c02c8610 0 863 1 0x00000000 [40049.762411] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c99f4>] (do_nanosleep+0xb0/0x110) [40049.762433] [<c02c99f4>] (do_nanosleep+0xb0/0x110) from [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) [40049.762455] [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) from [<c004eff4>] (sys_nanosleep+0x9c/0xa4) [40049.762475] [<c004eff4>] (sys_nanosleep+0x9c/0xa4) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) [40049.762495] segctord S c02c8610 0 865 2 0x00000000 [40049.762507] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) [40049.762591] [<bf0154ec>] (nilfs_segctor_thread+0x2d4/0x328 [nilfs2]) from [<c004aac0>] (kthread+0x7c/0x84) [40049.762670] [<c004aac0>] (kthread+0x7c/0x84) from [<c0023940>] (kernel_thread_exit+0x0/0x8) [40049.762690] nilfs_cleaner S c02c8610 0 866 1 0x00000000 [40049.762703] [<c02c8610>] (schedule+0x2a8/0x3b0) from [<c02c99f4>] (do_nanosleep+0xb0/0x110) [40049.762726] [<c02c99f4>] (do_nanosleep+0xb0/0x110) from [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) [40049.762748] [<c004eed0>] (hrtimer_nanosleep+0xa4/0x12c) from [<c004eff4>] (sys_nanosleep+0x9c/0xa4) [40049.762768] [<c004eff4>] (sys_nanosleep+0x9c/0xa4) from [<c0022f00>] (ret_fast_syscall+0x0/0x2c) -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a 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