It seems this is a problem in the symbios scsi driver which looks like
being present in the same form upstream.
[ 271.732918] [<ffffffff8139a109>] __sym_mfree_dma+0x69/0x100
This function disables interrupts to take a spinlock. Then calls
functions to free resources which will emit the warning when called with
interrupts disabled.
void __sym_mfree_dma(m_pool_ident_t dev_dmat, void *m, int size, char *name)
{
unsigned long flags;
m_pool_p mp;
spin_lock_irqsave(&sym53c8xx_lock, flags);
mp = ___get_dma_pool(dev_dmat);
if (!mp)
goto out;
__sym_mfree(mp, m, size, name);
#ifdef SYM_MEM_FREE_UNUSED
if (!mp->nump)
___del_dma_pool(mp);
#endif
out:
spin_unlock_irqrestore(&sym53c8xx_lock, flags);
}
Not sure whether the spinunlock might be simply moved up a bit. That
might need some discussion with upstream and or testing. But the bug
task could be moved to kernel. I guess the QEMU task can only be set to
invalid.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
** Changed in: linux (Ubuntu)
Status: New => Triaged
--
kernel stacktrace on volume detach in kvm guest
https://bugs.launchpad.net/bugs/458201
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