fio has a race between reap_threads() and free_ioengine(). free_ioengine()
will call the ioengine's cleanup routine and then dlclose it if it
is dynamically linked (like the spdk fio plugin). free_ioengine() does
not set td->io_ops = NULL though until after dlclose() is complete. If
reap_threads() tries to dereference td->io_ops after our plugin has been
closed but before io_ops was set to NULL, it will segfault.
Solution (until an upstream fio fix is available) is to use LD_PRELOAD
instead.
Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ide4eb3cb92a636513289107fc211fdf1f98b616f
Reviewed-on: https://review.gerrithub.io/365272
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Ziye Yang <optimistyzy@gmail.com>
7b7799bf9c