D34520.diff
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D34520.diff
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	diff --git a/sbin/dumpon/dumpon.c b/sbin/dumpon/dumpon.c
	--- a/sbin/dumpon/dumpon.c
	+++ b/sbin/dumpon/dumpon.c
	@@ -650,6 +650,15 @@
	error = ioctl(fd, DIOCSKERNELDUMP, kdap);
	if (error != 0)
	error = errno;
	+ if (error == EINVAL && (gzip \|\| zstd)) {
	+ /* Retry without 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;
	+ }
	explicit_bzero(kdap->kda_encryptedkey, kdap->kda_encryptedkeysize);
	free(kdap->kda_encryptedkey);
	explicit_bzero(kdap, sizeof(*kdap));