D8030.1794834722.diff
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	Index: sys/kern/vfs_syscalls.c
	===================================================================
	--- sys/kern/vfs_syscalls.c
	+++ sys/kern/vfs_syscalls.c
	@@ -446,10 +446,11 @@
	size_t *countp, enum uio_seg bufseg, int flags)
	{
	struct mount mp, nmp;
	- struct statfs sfsp, sp, sb;
	+ struct statfs sfsp, sp, sb, *tofree;
	size_t count, maxcount;
	int error;

	+restart:
	maxcount = bufsize / sizeof(struct statfs);
	if (bufsize == 0)
	sfsp = NULL;
	@@ -464,8 +465,8 @@
	mtx_unlock(&mountlist_mtx);
	if (maxcount > count)
	maxcount = count;
	- sfsp = buf = malloc(maxcount sizeof(struct statfs), M_TEMP,
	- M_WAITOK);
	+ tofree = sfsp = *buf =
	+ malloc(maxcount * sizeof(struct statfs), M_TEMP, M_WAITOK);
	}
	count = 0;
	mtx_lock(&mountlist_mtx);
	@@ -480,9 +481,17 @@
	continue;
	}
	#endif
	- if (vfs_busy(mp, MBF_NOWAIT \| MBF_MNTLSTLOCK)) {
	- nmp = TAILQ_NEXT(mp, mnt_list);
	- continue;
	+ if (flags == MNT_WAIT) {
	+ if (vfs_busy(mp, MBF_MNTLSTLOCK)) {
	+ mtx_unlock(&mountlist_mtx);
	+ free(tofree, M_TEMP);
	+ goto restart;
	+ }
	+ } else {
	+ if (vfs_busy(mp, MBF_NOWAIT \| MBF_MNTLSTLOCK)) {
	+ nmp = TAILQ_NEXT(mp, mnt_list);
	+ continue;
	+ }
	}
	if (sfsp && count < maxcount) {
	sp = &mp->mnt_stat;