On Sat, 2007-10-27 at 19:15 +1000, Nick Piggin wrote:
> On Saturday 27 October 2007 15:21, Mike Galbraith wrote:
> > Greetings,
> >
> > For quite a while now, RT kernels have been locking up on me
> > occasionally while my back is turned. Yesterday, the little bugger
> > finally pounced while my serial console box was up and waiting.
> >
> > [10138.162953] WARNING: at arch/i386/kernel/smp.c:581
> > native_smp_call_function_mask() [10138.170583] [<c01051da>]
> > show_trace_log_lvl+0x1a/0x30
> > [10138.175796] [<c0105de3>] show_trace+0x12/0x14
> > [10138.180291] [<c0105dfb>] dump_stack+0x16/0x18
> > [10138.184769] [<c011609f>] native_smp_call_function_mask+0x138/0x13d
> > [10138.191117] [<c0117606>] smp_call_function+0x1e/0x24
> > [10138.196210] [<c012f85c>] on_each_cpu+0x25/0x50
> > [10138.200807] [<c0115c74>] flush_tlb_all+0x1e/0x20
> > [10138.205553] [<c016caaf>] kmap_high+0x1b6/0x417
> > [10138.210118] [<c011ec88>] kmap+0x4d/0x4f
> > [10138.214102] [<c026a9d8>] ntfs_end_buffer_async_read+0x228/0x2f9
> > [10138.220163] [<c01a0e9e>] end_bio_bh_io_sync+0x26/0x3f
> > [10138.225352] [<c01a2b09>] bio_endio+0x42/0x6d
> > [10138.229769] [<c02c2a08>] __end_that_request_first+0x115/0x4ac
> > [10138.235682] [<c02c2da7>] end_that_request_chunk+0x8/0xa
> > [10138.241052] [<c0365943>] ide_end_request+0x55/0x10a
> > [10138.246058] [<c036dae3>] ide_dma_intr+0x6f/0xac
> > [10138.250727] [<c0366d83>] ide_intr+0x93/0x1e0
> > [10138.255125] [<c015afb4>] handle_IRQ_event+0x5c/0xc9
>
> Looks like ntfs is kmap()ing from interrupt context. Should
> be using kmap_atomic instead, I think.
>
> But the ntfs code I have seems to do just that...
The ntfs code does use kmap_atomic(), bit RT turns that into a wrapper
for kmap(). I fed it a local_irq_enable(), and am waiting for it to
tell me why that was stoopid ;-)
thanks,
-Mike
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