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SubjectRe: [bug] ata subsystem related crash with latest -git

* Ingo Molnar <mingo@elte.hu> wrote:

> > -#define SCSI_MAX_SG_SEGMENTS 128
> > +#define SCSI_MAX_SG_SEGMENTS 129
>
> this one finally made the trick and it's booting fine now, without any
> crashes!

hm, spoke too soon - i just got the ata_qc_issue() crash below. I've
attached further below the current fixes/workarounds that i have applied
at the moment. Any ideas?

Ingo

------------->
[ 155.259466] kjournald starting. Commit interval 5 seconds
[ 155.265103] EXT3 FS on sda5, internal journal
[ 155.269319] EXT3-fs: mounted filesystem with ordered data mode.
[ 156.458225] BUG: unable to handle kernel paging request at virtual address 7d5ac000
[ 156.465723] printing eip: 784e9300 *pde = 00ddd027 *pte = 055ac000
[ 156.471964] Oops: 0000 [#1] DEBUG_PAGEALLOC
[ 156.476123]
[ 156.477597] Pid: 0, comm: swapper Not tainted (2.6.23 #40)
[ 156.483055] EIP: 0060:[<784e9300>] EFLAGS: 00010006 CPU: 0
[ 156.488520] EIP is at ata_qc_issue+0xd0/0x340
[ 156.492848] EAX: 3d328000 EBX: 7d5ac000 ECX: 00000020 EDX: 00000020
[ 156.499087] ESI: 7d5ab480 EDI: 7d5abe00 EBP: 7b54007c ESP: 78a13e1c
[ 156.505328] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068
[ 156.510700] Process swapper (pid: 0, ti=78a12000 task=789753e0 task.ti=78a12000)
[ 156.517893] Stack: 7d5ac000 7b540000 7b540000 00000000 7d5abff0 7b54007c 7d5ab480 7b5417a4
[ 156.526213] 784c2330 784ef49e 784f1ff3 7b52de98 7d5ab480 7b540000 7b5417a4 7d5ab480
[ 156.534531] 7b540000 7b524004 784f20e0 784ef180 784c2330 7d5ab480 00000216 7b524004
[ 156.542851] Call Trace:
[ 156.545452] [<784c2330>] scsi_done+0x0/0x20
[ 156.549698] [<784ef49e>] ata_scsi_translate+0xbe/0x140
[ 156.554897] [<784f1ff3>] ata_scsi_queuecmd+0x33/0x200
[ 156.560010] [<784f20e0>] ata_scsi_queuecmd+0x120/0x200
[ 156.565210] [<784ef180>] ata_scsi_rw_xlat+0x0/0x220
[ 156.570150] [<784c2330>] scsi_done+0x0/0x20
[ 156.574395] [<784c2bb2>] scsi_dispatch_cmd+0x152/0x290
[ 156.579596] [<78135aa7>] trace_hardirqs_on+0x67/0xb0
[ 156.584622] [<784c8abe>] scsi_request_fn+0x1be/0x370
[ 156.589649] [<78407ef6>] blk_run_queue+0x36/0x80
[ 156.594328] [<784c73c0>] scsi_next_command+0x30/0x50
[ 156.599354] [<784c754b>] scsi_end_request+0xab/0xe0
[ 156.604294] [<784c8239>] scsi_io_completion+0xa9/0x3d0
[ 156.609493] [<78135aa7>] trace_hardirqs_on+0x67/0xb0
[ 156.614520] [<78404f85>] blk_done_softirq+0x45/0x80
[ 156.619460] [<78404fb3>] blk_done_softirq+0x73/0x80
[ 156.624400] [<7811d2f3>] __do_softirq+0x53/0xb0
[ 156.628992] [<7811d3b8>] do_softirq+0x68/0x70
[ 156.633412] [<78105351>] do_IRQ+0x51/0x90
[ 156.637486] [<7810290f>] restore_nocheck+0x12/0x15
[ 156.642339] [<7810388e>] common_interrupt+0x2e/0x40
[ 156.647277] [<7810f4c0>] pgd_dtor+0x0/0x50
[ 156.651437] [<7815f1d0>] quicklist_trim+0x0/0x90
[ 156.656117] [<7810f4bb>] check_pgt_cache+0x1b/0x20
[ 156.660970] [<78100c52>] cpu_idle+0x32/0x60
[ 156.665217] [<78a14b35>] start_kernel+0x265/0x300
[ 156.669983] [<78a14380>] unknown_bootoption+0x0/0x1e0
[ 156.675096] =======================
[ 156.678649] Code: 84 d9 01 00 00 7e 32 31 d2 89 f6 8b 1c 24 83 c2 01 8b 03 2b 05 18 ed d7 78 c1 f8 05 c1 e0 0c 03 43 04 89 43 08 83 c3 10 89 1c 24 <8b> 03 a8 01 0f 85 58 02 00 00 39 ca 75 d2 f0 83 44 24 00 00 85
[ 156.697455] EIP: [<784e9300>] ata_qc_issue+0xd0/0x340 SS:ESP 0068:78a13e1c
[ 156.704822] Kernel panic - not syncing: Fatal exception in interrupt
---
block/ll_rw_blk.c | 2 +-
drivers/ata/libata-core.c | 2 +-
drivers/scsi/scsi_lib.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
Index: linux/block/ll_rw_blk.c
===================================================================
--- linux.orig/block/ll_rw_blk.c
+++ linux/block/ll_rw_blk.c
@@ -631,7 +631,7 @@ void blk_queue_max_phys_segments(struct
printk("%s: set to minimum %d\n", __FUNCTION__, max_segments);
}

- q->max_phys_segments = max_segments;
+ q->max_phys_segments = max_segments - 1;
}

EXPORT_SYMBOL(blk_queue_max_phys_segments);
Index: linux/drivers/ata/libata-core.c
===================================================================
--- linux.orig/drivers/ata/libata-core.c
+++ linux/drivers/ata/libata-core.c
@@ -4664,7 +4664,7 @@ static int ata_sg_setup(struct ata_queue
{
struct ata_port *ap = qc->ap;
struct scatterlist *sg = qc->__sg;
- struct scatterlist *lsg = sg_last(qc->__sg, qc->n_elem);
+ struct scatterlist *lsg = &qc->__sg[qc->n_elem - 1];
int n_elem, pre_n_elem, dir, trim_sg = 0;

VPRINTK("ENTER, ata%u\n", ap->print_id);
Index: linux/drivers/scsi/scsi_lib.c
===================================================================
--- linux.orig/drivers/scsi/scsi_lib.c
+++ linux/drivers/scsi/scsi_lib.c
@@ -39,7 +39,7 @@
* (unless chaining is used). Should ideally fit inside a single page, to
* avoid a higher order allocation.
*/
-#define SCSI_MAX_SG_SEGMENTS 128
+#define SCSI_MAX_SG_SEGMENTS 129

struct scsi_host_sg_pool {
size_t size;
-
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