Author: mjg
Date: Wed Aug 19 02:50:09 2020
New Revision: 364371
URL: https://svnweb.freebsd.org/changeset/base/364371
Log:
vfs: sanity check mount counters in vfs_op_enter
Modified:
head/sys/kern/vfs_mount.c
Modified: head/sys/kern/vfs_mount.c
==============================================================================
--- head/sys/kern/vfs_mount.c Wed Aug 19 02:18:11 2020 (r364370)
+++ head/sys/kern/vfs_mount.c Wed Aug 19 02:50:09 2020 (r364371)
@@ -1518,6 +1518,9 @@ vfs_op_enter(struct mount *mp)
mp->mnt_writeopcount +=
zpcpu_replace_cpu(mp->mnt_writeopcount_pcpu, 0, cpu);
}
+ if (mp->mnt_ref <= 0 || mp->mnt_lockref < 0 || mp->mnt_writeopcount < 0)
+ panic("%s: invalid count(s) on mp %p: ref %d lockref %d
writeopcount %d\n",
+ __func__, mp, mp->mnt_ref, mp->mnt_lockref,
mp->mnt_writeopcount);
MNT_IUNLOCK(mp);
vfs_assert_mount_counters(mp);
}
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