diff options
Diffstat (limited to 'usr/src')
| -rw-r--r-- | usr/src/uts/common/os/kstat_fr.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/usr/src/uts/common/os/kstat_fr.c b/usr/src/uts/common/os/kstat_fr.c index fb5333921d..31ba702346 100644 --- a/usr/src/uts/common/os/kstat_fr.c +++ b/usr/src/uts/common/os/kstat_fr.c @@ -20,7 +20,7 @@ */ /* * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright 2013, Joyent, Inc. All rights reserved. + * Copyright 2014, Joyent, Inc. All rights reserved. */ /* @@ -1210,8 +1210,16 @@ kstat_install(kstat_t *ksp) /* * Now that the kstat is active, make it visible to the kstat driver. + * When copying out kstats the count is determined in + * header_kstat_update() and actually copied into kbuf in + * header_kstat_snapshot(). kstat_chain_lock is held across the two + * calls to ensure that this list doesn't change. Thus, we need to + * also take the lock to ensure that the we don't copy the new kstat + * in the 2nd pass and overrun the buf. */ + mutex_enter(&kstat_chain_lock); ksp->ks_flags &= ~KSTAT_FLAG_INVALID; + mutex_exit(&kstat_chain_lock); kstat_rele(ksp); } |