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in uao_get(), if we unlock the uobj to read a page from swap, 

we must clear the cached page array because it is now stale.
also add a missing call to uvm_page_array_fini() if the I/O fails.
fixes PR 55493.
This commit is contained in:
chs 2020-08-19 15:36:41 +00:00
parent dd79f1e46f
commit a8aa7072a7
1 changed files with 4 additions and 2 deletions
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6
sys/uvm/uvm_aobj.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_aobj.c,v 1.150 2020/08/19 07:29:00 simonb Exp $ */
/* $NetBSD: uvm_aobj.c,v 1.151 2020/08/19 15:36:41 chs Exp $ */
/*
* Copyright (c) 1998 Chuck Silvers, Charles D. Cranor and
@ -38,7 +38,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_aobj.c,v 1.150 2020/08/19 07:29:00 simonb Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_aobj.c,v 1.151 2020/08/19 15:36:41 chs Exp $");
#ifdef _KERNEL_OPT
#include "opt_uvmhist.h"
@ -982,6 +982,7 @@ uao_get(struct uvm_object *uobj, voff_t offset, struct vm_page **pps,
* unlock object for i/o, relock when done.
*/
uvm_page_array_clear(&a);
rw_exit(uobj->vmobjlock);
error = uvm_swap_get(ptmp, swslot, PGO_SYNCIO);
rw_enter(uobj->vmobjlock, RW_WRITER);
@ -1015,6 +1016,7 @@ uao_get(struct uvm_object *uobj, voff_t offset, struct vm_page **pps,
uvm_page_unbusy(pps, lcv);
}
memset(pps, 0, maxpages * sizeof(pps[0]));
uvm_page_array_fini(&a);
return error;
}
#else /* defined(VMSWAP) */