Date: Wed, 3 Dec 2008 13:20:02 GMT From: KOIE Hidetaka (=?iso-2022-jp?B?GyRCOHE5PjFRTjQbKEI=?=) <hide@koie.org> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/125859: [ata] sata access failure [regression] Message-ID: <200812031320.mB3DK2aX097133@freefall.freebsd.org>
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The following reply was made to PR kern/125859; it has been noted by GNATS.
From: KOIE Hidetaka (=?iso-2022-jp?B?GyRCOHE5PjFRTjQbKEI=?=) <hide@koie.org>
To: bug-followup@FreeBSD.org
Cc: hide@koie.rg
Subject: Re: kern/125859: [ata] sata access failure [regression]
Date: Wed, 03 Dec 2008 21:56:49 +0900 (JST)
I found how to fix at last.
This fix is to disable pre-allocation.
Please anybody fix the problem correctly.
Index: ata-dma.c
===================================================================
RCS file: /museum/freebsd/repo/usr/src/sys/dev/ata/ata-dma.c,v
retrieving revision 1.158
diff -u -p -r1.158 ata-dma.c
--- ata-dma.c 21 Oct 2008 18:51:55 -0000 1.158
+++ ata-dma.c 2 Dec 2008 12:19:54 -0000
@@ -183,7 +186,11 @@ ata_dmaalloc(device_t dev)
ch->dma.max_address,
BUS_SPACE_MAXADDR,
NULL, NULL, ch->dma.max_iosize,
ATA_DMA_ENTRIES, ch->dma.segsize,
+#if 1 /*XXX KOIE*/
+ 0, NULL, NULL, &slot->data_tag)) {
+#else
BUS_DMA_ALLOCNOW, NULL, NULL,
&slot->data_tag)) {
+#endif
device_printf(ch->dev, "FAILURE - create data_tag\n");
goto error;
}
Before applying this patch,
boot single user and then
zfs volinit and then
zfs mount -a and then
ldd if=/dev/zero of=/tmp/chunk bs=2m count=2000 and then
happen bus_dmamap_load() failure invoked by ata_dmaload().
The callgraph is
ata_begin_transaction
ata_dmaload
bus_dmamap_load
_bus_dmamap_load_buffer
reserve_bounce_pages
return non-zero because bz->free_bpages == 0.
ENOMEM
After the event, any ata devices on the system do not work.
(The kernel can not dump to adX.
To dump, scsi device or usb mass storage is needed.)
--
KOIE Hidetaka <hide@koie.org>
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