Re: [] Kernel coredump to a pipe is failing

From: Andrew Morton
Date: Tue May 26 2009 - 19:01:03 EST

On Tue, 26 May 2009 22:31:41 +0200
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> Block signals during core dump
> When a signal happens during core dump the core dump to a pipe
> can fail, because the write returns short, but the ELF core dumpers
> cannot handle that.
> There's no reason to handle signals during core dumping, so just
> block them all.
> Open issue: ELF puts blocked signals into the core dump and
> that will be always fully blocked now. Need to save it somewhere?
> Based on debugging by Paul Smith.
> Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>

dump_write() doesn't seem right, either. If ->write() returns, say,
100 then the dump should keep on going. At present it treats this
return as an error.

I wonder why the signal problem has just turned up now - did we change
the pipe code or something?

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