D15592.diff
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	Index: head/sys/kern/vfs_bio.c
	===================================================================
	--- head/sys/kern/vfs_bio.c
	+++ head/sys/kern/vfs_bio.c
	@@ -4310,6 +4310,8 @@

	extern int inflight_transient_maps;

	+static struct bio_queue nondump_bios;
	+
	void
	biodone(struct bio *bp)
	{
	@@ -4318,6 +4320,17 @@
	vm_offset_t start, end;

	biotrack(bp, __func__);
	+
	+ /*
	+ * Avoid completing I/O when dumping after a panic since that may
	+ * result in a deadlock in the filesystem or pager code. Note that
	+ * this doesn't affect dumps that were started manually since we aim
	+ * to keep the system usable after it has been resumed.
	+ */
	+ if (__predict_false(dumping && SCHEDULER_STOPPED())) {
	+ TAILQ_INSERT_HEAD(&nondump_bios, bp, bio_queue);
	+ return;
	+ }
	if ((bp->bio_flags & BIO_TRANSIENT_MAPPING) != 0) {
	bp->bio_flags &= ~BIO_TRANSIENT_MAPPING;
	bp->bio_flags \|= BIO_UNMAPPED;