Date: Wed, 19 Aug 2020 02:50:10 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r364371 - head/sys/kern Message-ID: <202008190250.07J2oAbt059857@repo.freebsd.org>
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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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