linux-kernel - Re: BUG: sleeping function called from invalid context at kernel/fork.c:385

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Message-ID: <20070530044448.GK86004887@sgi.com>
Date:	Wed, 30 May 2007 14:44:48 +1000
From:	David Chinner <dgc@....com>
To:	David Chinner <dgc@....com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>, linux-ia64@...r.kernel.org
Subject: Re: BUG: sleeping function called from invalid context at kernel/fork.c:385

On Wed, May 30, 2007 at 01:30:41PM +1000, David Chinner wrote:
> On Wed, May 23, 2007 at 10:44:16AM -0700, Luck, Tony wrote:
> > > > Saw this when running strace -f on a script on 2.6.21 on ia64:
> > > > 
> > > > BUG: sleeping function called from invalid context at kernel/fork.c:385
> > > > in_atomic():1, irqs_disabled():0
> >     ... snip ...
> > > > I could reproduce it via 'strace -f sleep 1'
> > > > 
> > >
> > > I'd say this is specific to ia64.   Someone would have spotted it on
> > > x86 by now.
> > 
> > I tried the "strace -f sleep 1" on 2.6.22-rc2, and I didn't see this "BUG"
> > there.  Can you try your other test cases on the latest kernel.  If it has
> > already been fixed we can see about identifying the patch for possible backport
> > to 2.6.21.stable
> 
> Sorry for taking so long to get back to this - I still see this in
> 2.6.22-rc2.

Hmmm - I wonder if my tree is screwed up in some weird way. I'm seeing link
warnings as well:

  AS      .tmp_kallsyms2.o
  LD      vmlinux
  SYSMAP  System.map
  SYSMAP  .tmp_System.map
  MODPOST vmlinux
WARNING: init/built-in.o - Section mismatch: reference to .init.data: from .sdata after 'root_mountflags' (at offset 0x38)
WARNING: init/built-in.o - Section mismatch: reference to .init.data:ino from .sdata after 'root_mountflags' (at offset 0x40)
WARNING: arch/ia64/kernel/built-in.o - Section mismatch: reference to .init.data:smp_boot_data from .sdata before 'acpi_irq_model' (at offset -0x0)
WARNING: arch/ia64/kernel/built-in.o - Section mismatch: reference to .init.data:rsvd_region from .sdata between 'ia64_sal' (at offset 0x118) and 'ia64_i_cache_stride_shift'
WARNING: arch/ia64/kernel/built-in.o - Section mismatch: reference to .init.data:smp_boot_data from .sdata between 'cpu.25267' (at offset0x2e8) and 'sal_state_for_booting_cpu'
WARNING: arch/ia64/mm/built-in.o - Section mismatch: reference to .init.data: from .sdata between 'hpage_shift' (at offset 0x50) and 'first_time.25897'
WARNING: arch/ia64/mm/built-in.o - Section mismatch: reference to .init.data: from .sdata between 'hpage_shift' (at offset 0x68) and 'first_time.25897'
WARNING: arch/ia64/mm/built-in.o - Section mismatch: reference to .init.data: from .sdata between 'hpage_shift' (at offset 0x70) and 'first_time.25897'
WARNING: arch/ia64/mm/built-in.o - Section mismatch: reference to .init.data: from .sdata between 'hpage_shift' (at offset 0x88) and 'first_time.25897'
WARNING: arch/ia64/mm/built-in.o - Section mismatch: reference to .init.data: from .sdata between 'hpage_shift' (at offset 0x90) and 'first_time.25897'
.....

There's more errors, but they are all section mismatch warnings.
I tried a make mrproper to see if that would fix but it didn't....

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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