2.6.18: BUG: lock held at task exit time! on resume from STR

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Running Toshiba Portege 4000, I have intermittent lockups at resume from STR. Those lockups were less frequent before 2.6.18 ("it mostly works"); after switching to 2.6.18 it is rather "it almost never works". After enabling full console output (SysRq-9) and doing suspend/resume I got:

BUG: lock held at task exit time!

echo/1931 is exiting with locks still held!
1 lock held by by echo/1931
#0 (acpi_gbl_hardware_lock) {+...}, at [<c01df0d8>]
acpi_os_acquire_lock+0x8/0xa

I also have relatively bad photo of screen with stack trace but it is not actually interesting (it just says task was exiting).

After that system stays still, I only can press power button.

echo mentioned above is likely to be

    FILE=/sys/power/state
    PARAM=mem

    /usr/share/suspend-scripts/run_scripts $debug suspend s3

    if ! (/bin/echo $PARAM > $FILE &) ;then
        ret=1
    fi

I appreciate any hint how to further debug the issue.

TIA

- -andrey
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