diff options
| author | dg <dg@FreeBSD.org> | 1998-11-18 09:00:47 +0000 |
|---|---|---|
| committer | dg <dg@FreeBSD.org> | 1998-11-18 09:00:47 +0000 |
| commit | 939b432d02d70b51f4c493b4539d70fc76b85817 (patch) | |
| tree | 9c19c39d996b0b6fcbe33ab03ffc075886f90908 /sys/kern/uipc_syscalls.c | |
| parent | feaedfaff603933e7dba04b2b6a7009f4251c507 (diff) | |
| download | FreeBSD-src-939b432d02d70b51f4c493b4539d70fc76b85817.zip FreeBSD-src-939b432d02d70b51f4c493b4539d70fc76b85817.tar.gz | |
Closed a very narrow and rare race condition that involved net interrupts,
bio interrupts, and a truncated file that along with the precise alignment
of the planets could result in a page being freed multiple times or a
just-freed page being put onto the inactive queue.
Diffstat (limited to 'sys/kern/uipc_syscalls.c')
| -rw-r--r-- | sys/kern/uipc_syscalls.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/kern/uipc_syscalls.c b/sys/kern/uipc_syscalls.c index a35931e..a857710 100644 --- a/sys/kern/uipc_syscalls.c +++ b/sys/kern/uipc_syscalls.c @@ -34,7 +34,7 @@ * SUCH DAMAGE. * * @(#)uipc_syscalls.c 8.4 (Berkeley) 2/21/94 - * $Id: uipc_syscalls.c,v 1.44 1998/11/14 23:36:17 dg Exp $ + * $Id: uipc_syscalls.c,v 1.45 1998/11/15 16:55:09 dg Exp $ */ #include "opt_compat.h" @@ -1366,6 +1366,7 @@ sf_buf_free(caddr_t addr, u_int size) { struct sf_buf *sf; struct vm_page *m; + int s; sf = dtosf(addr); if (sf->refcnt == 0) @@ -1374,6 +1375,7 @@ sf_buf_free(caddr_t addr, u_int size) if (sf->refcnt == 0) { pmap_qremove((vm_offset_t)addr, 1); m = sf->m; + s = splvm(); vm_page_unwire(m, 0); /* * Check for the object going away on us. This can @@ -1382,6 +1384,7 @@ sf_buf_free(caddr_t addr, u_int size) */ if (m->wire_count == 0 && m->object == NULL) vm_page_free(m); + splx(s); sf->m = NULL; SLIST_INSERT_HEAD(&sf_freelist, sf, free_list); if (sf_buf_alloc_want) { |
