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Bug#627594: access to SUBSYSTEM=power_supply sysfs nodes causes a remove/add/change events flood



Package: linux-2.6
Severity: important

This has been happening for a few months and makes upowerd unusable since 
the events flood make it use too much CPU and disk bandwidth.

How to reproduce:

Monitor the events with "udevadm monitor --env --kernel" and then access
sysfs with a command like:

cat /sys/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0/uevent


KERNEL[1306061762.655745] remove   /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV_LOG=3
ACTION=remove
DEVPATH=/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
SUBSYSTEM=power_supply
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_STATUS=Full
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=11100000
POWER_SUPPLY_VOLTAGE_NOW=12483000
POWER_SUPPLY_CURRENT_NOW=1000
POWER_SUPPLY_CHARGE_FULL_DESIGN=5200000
POWER_SUPPLY_CHARGE_FULL=4472000
POWER_SUPPLY_CHARGE_NOW=5200000
POWER_SUPPLY_MODEL_NAME=DELL PT4369A
POWER_SUPPLY_MANUFACTURER=Samsung SDI
POWER_SUPPLY_SERIAL_NUMBER=36118
SEQNUM=1858

KERNEL[1306061762.655965] add      /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV_LOG=3
ACTION=add
DEVPATH=/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
SUBSYSTEM=power_supply
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_STATUS=Full
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=11100000
POWER_SUPPLY_VOLTAGE_NOW=12483000
POWER_SUPPLY_CURRENT_NOW=1000
POWER_SUPPLY_CHARGE_FULL_DESIGN=5200000
POWER_SUPPLY_CHARGE_FULL=4472000
POWER_SUPPLY_CHARGE_NOW=5200000
POWER_SUPPLY_MODEL_NAME=DELL PT4369A
POWER_SUPPLY_MANUFACTURER=Samsung SDI
POWER_SUPPLY_SERIAL_NUMBER=36118
SEQNUM=1859

KERNEL[1306061762.656316] change   /devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0 (power_supply)
UDEV_LOG=3
ACTION=change
DEVPATH=/devices/LNXSYSTM:00/device:00/PNP0C0A:00/power_supply/BAT0
SUBSYSTEM=power_supply
POWER_SUPPLY_NAME=BAT0
POWER_SUPPLY_STATUS=Full
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=0
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=11100000
POWER_SUPPLY_VOLTAGE_NOW=12483000
POWER_SUPPLY_CURRENT_NOW=1000
POWER_SUPPLY_CHARGE_FULL_DESIGN=5200000
POWER_SUPPLY_CHARGE_FULL=4472000
POWER_SUPPLY_CHARGE_NOW=5200000
POWER_SUPPLY_MODEL_NAME=DELL PT4369A
POWER_SUPPLY_MANUFACTURER=Samsung SDI
POWER_SUPPLY_SERIAL_NUMBER=36118
SEQNUM=1860


-- System Information:
Debian Release: wheezy/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (x86_64)

Kernel: Linux 2.6.39-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=it_IT.utf8, LC_CTYPE=it_IT.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

-- 
ciao,
Marco

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