after some more testing i am more and more convinced this is a (very)
strange race at boot time.
Adding this patch to add some debugging printk to libata will make the
system crash once every 6/10 reboots. Without it boots once every 4/5
boots.
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -3265,6 +3265,9 @@ static void ata_sg_clean(struct ata_queu
/* restore last sg */
sg[qc->orig_n_elem - 1].length += qc->pad_len;
if (pad_buf) {
+ printk(KERN_CRIT "kmap_atomic from: ata_sg_clean\n");
+ }
+ if (pad_buf) {
struct scatterlist *psg = &qc->pad_sgent;
void *addr = kmap_atomic(psg->page, KM_IRQ0);
memcpy(addr + psg->offset, pad_buf, qc->pad_len);
@@ -3546,6 +3549,9 @@ static int ata_sg_setup(struct ata_queue
psg->offset = offset_in_page(offset);
if (qc->tf.flags & ATA_TFLAG_WRITE) {
+ printk(KERN_CRIT "kmap_atomic from: ata_sg_setup\n");
+ }
+ if (qc->tf.flags & ATA_TFLAG_WRITE) {
void *addr = kmap_atomic(psg->page, KM_IRQ0);
memcpy(pad_buf, addr + psg->offset, qc->pad_len);
kunmap_atomic(addr, KM_IRQ0);
@@ -3755,6 +3761,7 @@ static void ata_pio_sector(struct ata_qu
/* FIXME: use a bounce buffer */
local_irq_save(flags);
+ printk(KERN_CRIT "kmap_atomic from: ata_pio_sector\n");
buf = kmap_atomic(page, KM_IRQ0);
/* do the actual data transfer */
@@ -3908,6 +3915,7 @@ next_sg:
/* FIXME: use bounce buffer */
local_irq_save(flags);
+ printk(KERN_CRIT "kmap_atomic from: __atapi_pio_bytes\n");
buf = kmap_atomic(page, KM_IRQ0);
/* do the actual data transfer */
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 5c1fc46..9232929 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1646,6 +1646,7 @@ static unsigned int ata_scsi_rbuf_get(st
struct scatterlist *sg;
sg = (struct scatterlist *) cmd->request_buffer;
+ printk(KERN_CRIT "kmap_atomic from: ata_scsi_rbuf_get\n");
buf = kmap_atomic(sg->page, KM_USER0) + sg->offset;
buflen = sg->length;
} else {
I still cannot see crashes when using ata_generic.
Fabio
--
pata_via causes random crashes at boot
https://launchpad.net/bugs/72824
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