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

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Date:	Tue, 3 Oct 2006 21:04:20 +0400
From:	Andrey Borzenkov <arvidjaar@...l.ru>
To:	linux-kernel@...r.kernel.org
Cc:	linux-acpi@...r.kernel.org
Subject: 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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