[Bug 1215] Hotplug sigbus handler is using signal unsafe calls

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=1215

            Bug ID: 1215
           Summary: Hotplug sigbus handler is using signal unsafe calls
           Product: DPDK
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: core
          Assignee: dev at dpdk.org
          Reporter: stephen at networkplumber.org
  Target Milestone: ---

The sigbus_handler() in lib/eal/linux/eal_dev.c is using many direct library
calls and DPDK API's that are not safe to be used in a signal handler.
Unsafe routines include RTE_LOG() uses sprintf and syslog. etc..

It is also possible that failure_handle_lock could deadlock if called during a
change of state by other thread.
The safer way would be to use signalfd() and a monitoring thread.

Handling signals in Linux and BSD is hard.

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