On Mon Dec 12, 2022 at 3:57 PM AEST, wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=214913 > > --- Comment #9 from Michael Ellerman ([email protected]) --- > I assume it's an io_uring IO worker. > > They're created via create_io_worker() -> create_io_thread(). > > They pass a non-NULL `args->fn` to copy_process() -> copy_thread(), so we end > up in the "kernel thread" branch of the if, which sets p->thread.regs = NULL.
Hmm, you might be right. These things are created with the memory and thread / signal context shared with the userspace process. Still doesn't seem like they should be involved in core dumping though, pt_regs would have no meaning even if we did set something there. How best to catch these and filter them out of the core dump? Check for PF_IO_WORKER in the coredump gathering? Thanks, Nick
