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SubjectRe: post 3.5, phantom signals.
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Oleg Nesterov <oleg@redhat.com> writes:

> [...]
> Well, not sure this will help... but if you can reproduce this,
> may be you can identify the sender of the wrong SIGHUP at least.
>
> cd /sys/kernel/debug/tracing/
> echo "sig==1" >> events/signal/signal_generate/filter
> echo 1 >> options/stacktrace
> echo 1 >> events/signal/signal_generate/enable
> cat trace_pipe > SIGHUP_TRACE

FWIW, just in case your ftrace subsystem is already busy, this
two-liner is equivalent:

# stap -o SIGHUP_TRACE -e 'probe kernel.trace("signal_generate")
{ if ($sig==1) print_backtrace() }'
- FChE


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