D26122.diff
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	Index: sys/kern/vfs_mount.c
	===================================================================
	--- sys/kern/vfs_mount.c
	+++ sys/kern/vfs_mount.c
	@@ -2469,7 +2469,7 @@
	struct statfs *sfp = &mp->mnt_stat;
	char *buf;

	- buf = malloc(DEVCTL_LEN, M_MOUNT, M_WAITOK);
	+ buf = malloc(DEVCTL_LEN, M_MOUNT, M_NOWAIT);
	if (buf == NULL)
	return;
	sbuf_new(&sb, buf, DEVCTL_LEN, SBUF_FIXEDLEN);
	@@ -2496,7 +2496,8 @@
	dev_vfs_event_mntopt(&sb, "optnew", mp->mnt_optnew);
	sbuf_finish(&sb);

	- devctl_notify("VFS", "FS", type, sbuf_data(&sb));
	+ if (sbuf_error(&sb) == 0)
	+ devctl_notify("VFS", "FS", type, sbuf_data(&sb));
	sbuf_delete(&sb);
	free(buf, M_MOUNT);
	}