https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252554
--- Comment #4 from Ed Maste <ema...@freebsd.org> ---
Something like (completely untested):
+ if (error == EINVAL && netdump && (gzip || zstd)) {
+ /* Retry w/o compression in case kernel lacks support. */
+ kdap->kda_compression = KERNELDUMP_COMP_NONE;
+ error = ioctl(fd, DIOCSKERNELDUMP, kdap);
+ if (error == 0) {
+ warnx("Compression disabled; kernel may lack gzip or "
+ "zstd support.");
+ } else {
+ error = errno;
+ }
+ }
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