In the Linux kernel, following vulnerability has been resolved: io_uring/fdinfo: grab ctx->uring_lock around io_uring_show_fdinfo() Not everything requires locking in there, which is why 'has_lock' variable exists. But enough does that it's a bit unwieldy to manage. Wrap whole thing ->uring_lock trylock, and just return with no output if we fail it. The existing trylock() will already have greatly diminished utility/output for failure case. This fixes an issue with reading SQE fields, ring being actively resized at same time.