Hotplug sigbus handler is using signal unsafe calls

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: [email protected]
Reporter: [email protected]
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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