Re: 2.6.15-mm4

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* Re: 2.6.15-mm4
       [not found] <20060114055153.04684592.akpm@osdl.org>
@ 2006-01-14 22:49 ` Reuben Farrelly
  2006-01-16  4:08   ` 2.6.15-mm4 Tejun Heo
  2006-01-14 23:10 ` 2.6.15-mm4 Reuben Farrelly
  1 sibling, 1 reply; 7+ messages in thread
From: Reuben Farrelly @ 2006-01-14 22:49 UTC (permalink / raw)
  To: Andrew Morton; +Cc: Linux Kernel

On 15/01/2006 2:51 a.m., Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15/2.6.15-mm4/
> 
> (Will take an hour or so to mirror)
> 
> 
> 
> - Lots of mutex conversions
> 
> - FUSE update
> 
> - nfsd update (mainly nfs4)
> 
> - CPU scheduler update
> 
> - A few new syscalls.

A couple of issues to look at with this kernel, it seems.  I'll report them one 
by one, each in a different message so as to work the threading properly.

A trace:

Freeing unused kernel memory: 196k freed
Write protecting the kernel read-only data: 655k
Badness in blk_do_ordered at block/ll_rw_blk.c:549
  [<b01040d1>] show_trace+0xd/0xf
  [<b0104172>] dump_stack+0x17/0x19
  [<b01e2926>] blk_do_ordered+0x301/0x306
  [<b01de3a5>] elv_next_request+0x3a/0x120
  [<b0257ed1>] scsi_request_fn+0x57/0x2d5
  [<b01e0fc3>] __generic_unplug_device+0x22/0x25
  [<b01e119a>] generic_unplug_device+0x2c/0x39
  [<b028fb2c>] unplug_slaves+0x5d/0xea
  [<b028fbca>] raid1_unplug+0x11/0x1f
  [<b01ded12>] blk_backing_dev_unplug+0xf/0x11
  [<b01596a0>] sync_buffer+0x2e/0x37
  [<b030ab61>] __wait_on_bit+0x45/0x62
  [<b030abe9>] out_of_line_wait_on_bit+0x6b/0x82
  [<b0159600>] __wait_on_buffer+0x27/0x2d
  [<b01a7888>] search_by_key+0x14e/0x11a5
  [<b019431f>] reiserfs_read_locked_inode+0x64/0x561
  [<b019488c>] reiserfs_iget+0x70/0x88
  [<b01917c0>] reiserfs_lookup+0xbf/0x10e
  [<b016366e>] do_lookup+0x105/0x132
  [<b01647fd>] __link_path_walk+0x11e/0xd4b
  [<b0165470>] link_path_walk+0x46/0xd2
  [<b0165715>] do_path_lookup+0xa9/0x215
  [<b01661c0>] __path_lookup_intent_open+0x44/0x7f
  [<b0166273>] path_lookup_open+0x21/0x27
  [<b0166367>] open_namei+0x62/0x5a0
  [<b0155a52>] do_filp_open+0x26/0x43
  [<b0155ab0>] do_sys_open+0x41/0xc2
  [<b0155b69>] sys_open+0x1c/0x1e
  [<b0100460>] init+0x193/0x325
  [<b0100d25>] kernel_thread_helper+0x5/0xb
INIT: version 2.86 booting

It has never properly blown up into a full detailed oops, just spews out the 
trace to console and then hangs.

I've seen this multiple times today, it is however fatal as every time it has 
occurred the box needs a reset.

reuben





^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
  2006-01-14 22:49 ` 2.6.15-mm4 Reuben Farrelly
@ 2006-01-16  4:08   ` Tejun Heo
  0 siblings, 0 replies; 7+ messages in thread
From: Tejun Heo @ 2006-01-16  4:08 UTC (permalink / raw)
  To: Reuben Farrelly; +Cc: Andrew Morton, Linux Kernel

On Sun, Jan 15, 2006 at 11:49:10AM +1300, Reuben Farrelly wrote:
> On 15/01/2006 2:51 a.m., Andrew Morton wrote:
> >ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15/2.6.15-mm4/
> >
> >(Will take an hour or so to mirror)
> >
> >
> >
> >- Lots of mutex conversions
> >
> >- FUSE update
> >
> >- nfsd update (mainly nfs4)
> >
> >- CPU scheduler update
> >
> >- A few new syscalls.
> 
> A couple of issues to look at with this kernel, it seems.  I'll report them 
> one by one, each in a different message so as to work the threading 
> properly.
> 
> A trace:
> 
> Freeing unused kernel memory: 196k freed
> Write protecting the kernel read-only data: 655k
> Badness in blk_do_ordered at block/ll_rw_blk.c:549
>  [<b01040d1>] show_trace+0xd/0xf
>  [<b0104172>] dump_stack+0x17/0x19
>  [<b01e2926>] blk_do_ordered+0x301/0x306
>  [<b01de3a5>] elv_next_request+0x3a/0x120
>  [<b0257ed1>] scsi_request_fn+0x57/0x2d5
>  [<b01e0fc3>] __generic_unplug_device+0x22/0x25
>  [<b01e119a>] generic_unplug_device+0x2c/0x39
>  [<b028fb2c>] unplug_slaves+0x5d/0xea
>  [<b028fbca>] raid1_unplug+0x11/0x1f
>  [<b01ded12>] blk_backing_dev_unplug+0xf/0x11
>  [<b01596a0>] sync_buffer+0x2e/0x37
>  [<b030ab61>] __wait_on_bit+0x45/0x62
>  [<b030abe9>] out_of_line_wait_on_bit+0x6b/0x82
>  [<b0159600>] __wait_on_buffer+0x27/0x2d
>  [<b01a7888>] search_by_key+0x14e/0x11a5
>  [<b019431f>] reiserfs_read_locked_inode+0x64/0x561
>  [<b019488c>] reiserfs_iget+0x70/0x88
>  [<b01917c0>] reiserfs_lookup+0xbf/0x10e
>  [<b016366e>] do_lookup+0x105/0x132
>  [<b01647fd>] __link_path_walk+0x11e/0xd4b
>  [<b0165470>] link_path_walk+0x46/0xd2
>  [<b0165715>] do_path_lookup+0xa9/0x215
>  [<b01661c0>] __path_lookup_intent_open+0x44/0x7f
>  [<b0166273>] path_lookup_open+0x21/0x27
>  [<b0166367>] open_namei+0x62/0x5a0
>  [<b0155a52>] do_filp_open+0x26/0x43
>  [<b0155ab0>] do_sys_open+0x41/0xc2
>  [<b0155b69>] sys_open+0x1c/0x1e
>  [<b0100460>] init+0x193/0x325
>  [<b0100d25>] kernel_thread_helper+0x5/0xb
> INIT: version 2.86 booting
> 
> It has never properly blown up into a full detailed oops, just spews out 
> the trace to console and then hangs.
> 
> I've seen this multiple times today, it is however fatal as every time it 
> has occurred the box needs a reset.
> 
> reuben
> 

Hello, Reuben.

Thanks for reporting the bug.  Can you please verify whether the
following patch fixes the bug?

--- a/block/elevator.c
+++ b/block/elevator.c
@@ -304,7 +304,7 @@ void elv_requeue_request(request_queue_t
 
 	rq->flags &= ~REQ_STARTED;
 
-	__elv_add_request(q, rq, ELEVATOR_INSERT_REQUEUE, 0);
+	elv_insert(q, rq, ELEVATOR_INSERT_REQUEUE);
 }
 
 static void elv_drain_elevator(request_queue_t *q)
@@ -321,42 +321,13 @@ static void elv_drain_elevator(request_q
 	}
 }
 
-void __elv_add_request(request_queue_t *q, struct request *rq, int where,
-		       int plug)
+void elv_insert(request_queue_t *q, struct request *rq, int where)
 {
 	struct list_head *pos;
 	unsigned ordseq;
 
 	blk_add_trace_rq(q, rq, BLK_TA_INSERT);
 
-	if (q->ordcolor)
-		rq->flags |= REQ_ORDERED_COLOR;
-
-	if (rq->flags & (REQ_SOFTBARRIER | REQ_HARDBARRIER)) {
-		/*
-		 * toggle ordered color
-		 */
-		q->ordcolor ^= 1;
-
-		/*
-		 * barriers implicitly indicate back insertion
-		 */
-		if (where == ELEVATOR_INSERT_SORT)
-			where = ELEVATOR_INSERT_BACK;
-
-		/*
-		 * this request is scheduling boundary, update end_sector
-		 */
-		if (blk_fs_request(rq)) {
-			q->end_sector = rq_end_sector(rq);
-			q->boundary_rq = rq;
-		}
-	} else if (!(rq->flags & REQ_ELVPRIV) && where == ELEVATOR_INSERT_SORT)
-		where = ELEVATOR_INSERT_BACK;
-
-	if (plug)
-		blk_plug_device(q);
-
 	rq->q = q;
 
 	switch (where) {
@@ -437,6 +408,42 @@ void __elv_add_request(request_queue_t *
 	}
 }
 
+void __elv_add_request(request_queue_t *q, struct request *rq, int where,
+		       int plug)
+{
+	if (q->ordcolor)
+		rq->flags |= REQ_ORDERED_COLOR;
+
+	if (rq->flags & (REQ_SOFTBARRIER | REQ_HARDBARRIER)) {
+		/*
+		 * toggle ordered color
+		 */
+		if (blk_barrier_rq(rq))
+			q->ordcolor ^= 1;
+
+		/*
+		 * barriers implicitly indicate back insertion
+		 */
+		if (where == ELEVATOR_INSERT_SORT)
+			where = ELEVATOR_INSERT_BACK;
+
+		/*
+		 * this request is scheduling boundary, update
+		 * end_sector
+		 */
+		if (blk_fs_request(rq)) {
+			q->end_sector = rq_end_sector(rq);
+			q->boundary_rq = rq;
+		}
+	} else if (!(rq->flags & REQ_ELVPRIV) && where == ELEVATOR_INSERT_SORT)
+		where = ELEVATOR_INSERT_BACK;
+
+	if (plug)
+		blk_plug_device(q);
+
+	elv_insert(q, rq, where);
+}
+
 void elv_add_request(request_queue_t *q, struct request *rq, int where,
 		     int plug)
 {
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -453,7 +453,7 @@ static void queue_flush(request_queue_t 
 	rq->end_io = end_io;
 	q->prepare_flush_fn(q, rq);
 
-	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0);
+	elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
 }
 
 static inline struct request *start_ordered(request_queue_t *q,
@@ -489,7 +489,7 @@ static inline struct request *start_orde
 	else
 		q->ordseq |= QUEUE_ORDSEQ_POSTFLUSH;
 
-	__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0);
+	elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
 
 	if (q->ordered & QUEUE_ORDERED_PREFLUSH) {
 		queue_flush(q, QUEUE_ORDERED_PREFLUSH);
--- a/include/linux/elevator.h
+++ b/include/linux/elevator.h
@@ -82,6 +82,7 @@ struct elevator_queue
 extern void elv_dispatch_sort(request_queue_t *, struct request *);
 extern void elv_add_request(request_queue_t *, struct request *, int, int);
 extern void __elv_add_request(request_queue_t *, struct request *, int, int);
+extern void elv_insert(request_queue_t *, struct request *, int);
 extern int elv_merge(request_queue_t *, struct request **, struct bio *);
 extern void elv_merge_requests(request_queue_t *, struct request *,
 			       struct request *);


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
       [not found] <20060114055153.04684592.akpm@osdl.org>
  2006-01-14 22:49 ` 2.6.15-mm4 Reuben Farrelly
@ 2006-01-14 23:10 ` Reuben Farrelly
  1 sibling, 0 replies; 7+ messages in thread
From: Reuben Farrelly @ 2006-01-14 23:10 UTC (permalink / raw)
  To: Andrew Morton; +Cc: Linux Kernel, Jeff Garzik, Alan Cox

On 15/01/2006 2:51 a.m., Andrew Morton wrote:
> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.15/2.6.15-mm4/
> 
> (Will take an hour or so to mirror)
> 
> 
> 
> - Lots of mutex conversions
> 
> - FUSE update
> 
> - nfsd update (mainly nfs4)
> 
> - CPU scheduler update
> 
> - A few new syscalls.

Still seeing a nasty libata implosion with 2.6.15-mm4 as well.  Advice or 
suggestions on what else to try would be welcome.

In an attempt to boot this kernel it went like this:

Attempt 1: Oops below, assigned IRQ 0
Attempt 2: Oops below, assigned IRQ 0
Attempt 3: Oops below, assigned IRQ 0
Attempt 4: ATA timeout, SStatus 113, was assigned IRQ 50
Attempt 5: Oopsed again, this time not in ATA (which seems to have come up OK). 
  See previous thread/bug report for this.
Attempt 6: Oopsed, assigned IRQ 0
Attempt 7: Oopsed, assigned IRQ 0
Attempt 8: Oopsed, assigned IRQ 0

I was getting a bit sick of trying to boot up with this kernel so reverted to 
2.6.15-mm1

Attempt 9: Oopsed, assigned IRQ 0
Attempt 10: Came up all OK and is running fine right now.  Nothing apparently wrong.

I've reset the CMOS and reconfigured it before attempt 1, and repatched and 
recompiled the source just to be certain no other remnants of previous testing 
patches were in.  I don't think there were, but wanted to be certain.
The box is running the latest BIOS available for it.  It's an Intel D925XCV - 
http://support.intel.com/support/motherboards/desktop/d925xcv/index.htm



Here's the critical parts of the IRQ 50 bootup (attempt 4):

ata1: SATA link up 1.5 Gbps (SStatus 113)
ata1 is slow to respond, please be patient
ata1 failed to respond (30 secs)
scsi0 : ahci

Here's the IRQ 0 bootup:

Linux version 2.6.15-mm4 (root@tornado.reub.net) (gcc version 4.1.0 20060106 
(Red Hat 4.1.0-0.14)) #1 SMP Sun Jan 15 11:18:36 NZDT 2006
BIOS-provided physical RAM map:
  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
  BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
  BIOS-e820: 0000000000100000 - 000000003fe2f800 (usable)
  BIOS-e820: 000000003fe2f800 - 000000003fe3f8e3 (ACPI NVS)
  BIOS-e820: 000000003ff2f800 - 000000003ff30000 (ACPI NVS)
  BIOS-e820: 000000003ff30000 - 000000003ff40000 (ACPI data)
  BIOS-e820: 000000003ff40000 - 000000003fff0000 (ACPI NVS)
  BIOS-e820: 000000003fff0000 - 0000000040000000 (reserved)
  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
  BIOS-e820: 00000000fed13000 - 00000000fed1a000 (reserved)
  BIOS-e820: 00000000fed1c000 - 00000000feda0000 (reserved)
0MB HIGHMEM available.
1022MB LOWMEM available.
found SMP MP-table at 000ff780
DMI 2.3 present.
ACPI: PM-Timer IO Port: 0x408
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:3 APIC version 20
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:3 APIC version 20
ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
Enabling APIC mode:  Flat.  Using 1 I/O APICs
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 50000000 (gap: 40000000:a0000000)
Detected 2800.341 MHz processor.
Built 1 zonelists
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
Kernel command line: ro root=/dev/md0 panic=60 console=ttyS0,57600
CPU 0 irqstacks, hard=b0441000 soft=b043f000
PID hash table entries: 4096 (order: 12, 65536 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1033436k/1046716k available (2099k kernel code, 12712k reserved, 1002k 
data, 196k init, 0k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 5607.20 BogoMIPS (lpj=11214403)
Mount-cache hash table entries: 512
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
mtrr: v2.0 (20020519)
Checking 'hlt' instruction... OK.
CPU0: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Booting processor 1/1 eip 2000
CPU 1 irqstacks, hard=b0442000 soft=b0440000
Initializing CPU#1
Calibrating delay using timer specific routine.. 5600.59 BogoMIPS (lpj=11201191)
monitor/mwait feature present.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: Intel P4/Xeon Extended MCE MSRs (12) available
CPU1: Thermal monitoring enabled
CPU1: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Total of 2 processors activated (11207.79 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
checking TSC synchronization across 2 CPUs: passed.
Brought up 2 CPUs
migration_cost=107
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: Using MMCONFIG
ACPI: Subsystem revision 20051216
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
PCI: Transparent bridge - 0000:00:1e.0
ACPI: Power Resource [URP1] (off)
ACPI: Power Resource [FDDP] (off)
ACPI: Power Resource [LPTP] (off)
ACPI: Power Resource [URP2] (off)
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKC] (IRQs *3 4 5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled.
ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled.
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a report
PCI: Bridge: 0000:00:01.0
   IO window: disabled.
   MEM window: ffa00000-ffafffff
   PREFETCH window: fdf00000-fdffffff
PCI: Bridge: 0000:00:1c.0
   IO window: disabled.
   MEM window: ff600000-ff6fffff
   PREFETCH window: fdb00000-fdbfffff
PCI: Bridge: 0000:00:1c.1
   IO window: a000-afff
   MEM window: ff700000-ff7fffff
   PREFETCH window: fdc00000-fdcfffff
PCI: Bridge: 0000:00:1c.2
   IO window: disabled.
   MEM window: ff800000-ff8fffff
   PREFETCH window: fdd00000-fddfffff
PCI: Bridge: 0000:00:1c.3
   IO window: disabled.
   MEM window: ff900000-ff9fffff
   PREFETCH window: fde00000-fdefffff
PCI: Bridge: 0000:00:1e.0
   IO window: b000-bfff
   MEM window: ff500000-ff5fffff
   PREFETCH window: fe000000-fe7fffff
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 17 (level, low) -> IRQ 177
PCI: Enabling device 0000:00:1c.1 (0106 -> 0107)
ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 16 (level, low) -> IRQ 169
ACPI: PCI Interrupt 0000:00:1c.2[C] -> GSI 18 (level, low) -> IRQ 185
ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 193
Machine check exception polling timer started.
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered<6>Time: tsc clocksource has been installed.

0000:00:1d.7 EHCI: early BIOS handoff failed (BIOS bug ?)
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
assign_interrupt_mode Found MSI capability
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 17 (level, low) -> IRQ 177
assign_interrupt_mode Found MSI capability
ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 16 (level, low) -> IRQ 169
assign_interrupt_mode Found MSI capability
ACPI: PCI Interrupt 0000:00:1c.2[C] -> GSI 18 (level, low) -> IRQ 185
assign_interrupt_mode Found MSI capability
ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 193
assign_interrupt_mode Found MSI capability
ACPI: Power Button (FF) [PWRF]
ACPI: Power Button (CM) [PWRB]
ACPI: Processor [CPU1] (supports 8 throttling states)
ACPI: Processor [CPU2] (supports 8 throttling states)
Real Time Clock Driver v1.12ac
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
ÿserial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ACPI: PCI Interrupt 0000:06:02.0[A] -> GSI 18 (level, low) -> IRQ 185
0000:06:02.0: ttyS1 at I/O 0xbc00 (irq = 185) is a 16550A
0000:06:02.0: ttyS2 at I/O 0xbc08 (irq = 185) is a 16550A
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
ahci: probe of 0000:00:1f.2 failed with error -12
ata_piix 0000:00:1f.2: combined mode detected (p=1, s=0)
ata1: SATA max UDMA/133 cmd 0x0 ctl 0x2 bmdma 0x0 irq 0
ata2: SATA max UDMA/133 cmd 0x0 ctl 0x2 bmdma 0x8 irq 0
Unable to handle kernel NULL pointer dereference at virtual address 00000000
  printing eip:
b023b1e0
*pde = 00000000
Oops: 0000 [#1]
SMP
last sysfs file:
Modules linked in:
CPU:    0
EIP:    0060:[<b023b1e0>]    Not tainted VLI
EFLAGS: 00010206   (2.6.15-mm4)
EIP is at make_class_name+0x28/0x8d
eax: 00000000   ebx: ffffffff   ecx: ffffffff   edx: efcf224c
esi: 00000009   edi: 00000000   ebp: efe12d2c   esp: efe12d1c
ds: 007b   es: 007b   ss: 0068
Process swapper (pid: 1, threadinfo=efe12000 task=efe11a70)
Stack: <0>efcf224c b03cc7d8 efcf224c b03cc7d8 efe12d54 b023b40d efe12d58 b03cc7e0
        b03cc760 00000000 22222222 efcf224c efcf2000 00000296 efe12d60 b023b4c8
        efcf20f8 efe12d74 b0253fe1 efcf22e8 efc284c0 00000000 efe12d80 b025c458
Call Trace:
  [<b0103bd5>] show_stack_log_lvl+0xc5/0xea
  [<b0103d61>] show_registers+0x167/0x1ec
  [<b0103f0c>] die+0x126/0x231
  [<b011402b>] do_page_fault+0x271/0x5b9
  [<b0103713>] error_code+0x4f/0x54
  [<b023b40d>] class_device_del+0x86/0x136
  [<b023b4c8>] class_device_unregister+0xb/0x15
  [<b0253fe1>] scsi_remove_host+0x9b/0xd7
  [<b025c458>] ata_host_remove+0x11/0x1c
  [<b025f076>] ata_device_add+0x2ed/0xb8c
  [<b025fe9e>] ata_pci_init_one+0x322/0x389
  [<b0264994>] piix_init_one+0x18c/0x338
  [<b01f47af>] pci_device_probe+0x44/0x5f
  [<b023aadd>] driver_probe_device+0x3e/0xb0
  [<b023aba9>] __driver_attach+0x5a/0x5c
  [<b023a6cb>] bus_for_each_dev+0x40/0x5e
  [<b023a9e4>] driver_attach+0x19/0x1b
  [<b023a24a>] bus_add_driver+0x6d/0x126
  [<b023aced>] driver_register+0x68/0x98
  [<b01f4958>] __pci_register_driver+0x67/0x92
  [<b0421dc8>] piix_init+0xf/0x22
  [<b01003cc>] init+0xff/0x325
  [<b0100d25>] kernel_thread_helper+0x5/0xb
Code: c8 5d c3 55 89 e5 57 56 53 83 ec 04 89 45 f0 89 c2 8b 40 48 8b 38 bb ff ff 
ff ff 89 d9 31 c0 f2 ae f7 d1 49 89 ce 8b 7a 08 89 d9 <f2> ae f7 d1 49 89 ca 8d 
4e 02 8d 04 0a ba d0 00 00 00 e8 6a 8a
  <0>Kernel panic - not syncing: Attempted to kill init!
  <0>Rebooting in 60 seconds..


And here's a 2.6.15-mm1 boot up which is running now and is OK.

Linux version 2.6.15-mm1 (root@tornado.reub.net) (gcc version 4.1.0 20051222 
(Red Hat 4.1.0-0.12)) #1 SMP Sun Jan 8
03:42:25 NZDT 2006
BIOS-provided physical RAM map:
  BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
  BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
  BIOS-e820: 00000000000e6000 - 0000000000100000 (reserved)
  BIOS-e820: 0000000000100000 - 000000003fe2f800 (usable)
  BIOS-e820: 000000003fe2f800 - 000000003fe3f8e3 (ACPI NVS)
  BIOS-e820: 000000003ff2f800 - 000000003ff30000 (ACPI NVS)
  BIOS-e820: 000000003ff30000 - 000000003ff40000 (ACPI data)
  BIOS-e820: 000000003ff40000 - 000000003fff0000 (ACPI NVS)
  BIOS-e820: 000000003fff0000 - 0000000040000000 (reserved)
  BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
  BIOS-e820: 00000000fed13000 - 00000000fed1a000 (reserved)
  BIOS-e820: 00000000fed1c000 - 00000000feda0000 (reserved)
126MB HIGHMEM available.
896MB LOWMEM available.
found SMP MP-table at 000ff780
On node 0 totalpages: 261679
   DMA zone: 4096 pages, LIFO batch:0
   DMA32 zone: 0 pages, LIFO batch:0
   Normal zone: 225280 pages, LIFO batch:31
   HighMem zone: 32303 pages, LIFO batch:7
DMI 2.3 present.
ACPI: RSDP (v000 ACPIAM                                ) @ 0x000f4ee0
ACPI: RSDT (v001 INTEL  D925XCV  0x20051110 MSFT 0x00000097) @ 0x3ff30000
ACPI: FADT (v002 INTEL  D925XCV  0x20051110 MSFT 0x00000097) @ 0x3ff30200
ACPI: MADT (v001 INTEL  D925XCV  0x20051110 MSFT 0x00000097) @ 0x3ff30390
ACPI: MCFG (v001 INTEL  D925XCV  0x20051110 MSFT 0x00000097) @ 0x3ff30400
ACPI: ASF! (v016 LEGEND I865PASF 0x00000001 INTL 0x02002026) @ 0x3ff35fa0
ACPI: TCPA (v001 INTEL  TBLOEMID 0x00000001 MSFT 0x00000097) @ 0x3ff36040
ACPI: WDDT (v001 INTEL  OEMWDDT  0x00000001 INTL 0x02002026) @ 0x3ff36072
ACPI: DSDT (v001 INTEL  D925XCV  0x00000001 INTL 0x02002026) @ 0x00000000
ACPI: PM-Timer IO Port: 0x408
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x01] lapic_id[0x00] enabled)
Processor #0 15:3 APIC version 20
ACPI: LAPIC (acpi_id[0x02] lapic_id[0x01] enabled)
Processor #1 15:3 APIC version 20
ACPI: LAPIC_NMI (acpi_id[0x01] dfl dfl lint[0x1])
ACPI: LAPIC_NMI (acpi_id[0x02] dfl dfl lint[0x1])
ACPI: IOAPIC (id[0x02] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 high level)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ9 used by override.
Enabling APIC mode:  Flat.  Using 1 I/O APICs
Using ACPI (MADT) for SMP configuration information
Allocating PCI resources starting at 50000000 (gap: 40000000:a0000000)
Detected 2800.238 MHz processor.
Built 1 zonelists
mapped APIC to ffffd000 (fee00000)
mapped IOAPIC to ffffc000 (fec00000)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Initializing CPU#0
Kernel command line: ro root=/dev/md0 panic=60 console=ttyS0,57600
CPU 0 irqstacks, hard=c040d000 soft=c040b000
PID hash table entries: 4096 (order: 12, 65536 bytes)
Console: colour VGA+ 80x25
Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
Memory: 1033540k/1046716k available (2148k kernel code, 12512k reserved, 741k 
data, 200k init, 129212k highmem)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
Calibrating delay using timer specific routine.. 5607.08 BogoMIPS (lpj=11214174)
Mount-cache hash table entries: 512
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 
00000000 00000000
CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 
00000000 00000000
monitor/mwait feature present.
using mwait in idle threads.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: After all inits, caps: bfebfbff 00000000 00000000 00000180 0000441d 
00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#0.
CPU0: Intel P4/Xeon Extended MCE MSRs (12) available
CPU0: Thermal monitoring enabled
mtrr: v2.0 (20020519)
Checking 'hlt' instruction... OK.
CPU0: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Booting processor 1/1 eip 2000
CPU 1 irqstacks, hard=c040e000 soft=c040c000
Initializing CPU#1
Calibrating delay using timer specific routine.. 5600.53 BogoMIPS (lpj=11201076)
CPU: After generic identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 
00000000 00000000
CPU: After vendor identify, caps: bfebfbff 00000000 00000000 00000000 0000441d 
00000000 00000000
monitor/mwait feature present.
CPU: Trace cache: 12K uops, L1 D cache: 16K
CPU: L2 cache: 1024K
CPU: Physical Processor ID: 0
CPU: After all inits, caps: bfebfbff 00000000 00000000 00000180 0000441d 
00000000 00000000
Intel machine check architecture supported.
Intel machine check reporting enabled on CPU#1.
CPU1: Intel P4/Xeon Extended MCE MSRs (12) available
CPU1: Thermal monitoring enabled
CPU1: Intel(R) Pentium(R) 4 CPU 2.80GHz stepping 04
Total of 2 processors activated (11207.62 BogoMIPS).
ENABLING IO-APIC IRQs
..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
checking TSC synchronization across 2 CPUs: passed.
Brought up 2 CPUs
migration_cost=200
NET: Registered protocol family 16
ACPI: bus type pci registered
PCI: Using MMCONFIG
ACPI: Subsystem revision 20051216
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (0000:00)
PCI: Ignoring BAR0-3 of IDE controller 0000:00:1f.1
Boot video device is 0000:06:00.0
PCI: Transparent bridge - 0000:00:1e.0
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEGP._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.P0P2._PRT]
ACPI: Power Resource [URP1] (off)
ACPI: Power Resource [FDDP] (off)
ACPI: Power Resource [LPTP] (off)
ACPI: Power Resource [URP2] (off)
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX1._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX2._PRT]
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0.PEX3._PRT]
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKC] (IRQs *3 4 5 6 7 9 10 11 12 14 15)
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKE] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled.
ACPI: PCI Interrupt Link [LNKF] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0
ACPI: PCI Interrupt Link [LNKG] (IRQs 3 4 5 6 7 9 10 11 12 14 15) *0, disabled.
ACPI: PCI Interrupt Link [LNKH] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If it helps, post a report
PCI: Bridge: 0000:00:01.0
   IO window: disabled.
   MEM window: ffa00000-ffafffff
   PREFETCH window: fdf00000-fdffffff
PCI: Bridge: 0000:00:1c.0
   IO window: disabled.
   MEM window: ff600000-ff6fffff
   PREFETCH window: fdb00000-fdbfffff
PCI: Bridge: 0000:00:1c.1
   IO window: a000-afff
   MEM window: ff700000-ff7fffff
   PREFETCH window: fdc00000-fdcfffff
PCI: Bridge: 0000:00:1c.2
   IO window: disabled.
   MEM window: ff800000-ff8fffff
   PREFETCH window: fdd00000-fddfffff
PCI: Bridge: 0000:00:1c.3
   IO window: disabled.
   MEM window: ff900000-ff9fffff
   PREFETCH window: fde00000-fdefffff
PCI: Bridge: 0000:00:1e.0
   IO window: b000-bfff
   MEM window: ff500000-ff5fffff
   PREFETCH window: fe000000-fe7fffff
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:00:01.0 to 64
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 17 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:00:1c.0 to 64
PCI: Enabling device 0000:00:1c.1 (0106 -> 0107)
ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:00:1c.1 to 64
ACPI: PCI Interrupt 0000:00:1c.2[C] -> GSI 18 (level, low) -> IRQ 185
PCI: Setting latency timer of device 0000:00:1c.2 to 64
ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 193
PCI: Setting latency timer of device 0000:00:1c.3 to 64
PCI: Setting latency timer of device 0000:00:1e.0 to 64
Machine check exception polling timer started.
highmem bounce pool size: 64 pages
Initializing Cryptographic API
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered<6>Time: tsc clocksource has been installed.

0000:00:1d.7 EHCI: early BIOS handoff failed (BIOS bug ?)
ACPI: PCI Interrupt 0000:00:01.0[A] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:00:01.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:01.0:pcie00]
Allocate Port Service[0000:00:01.0:pcie03]
ACPI: PCI Interrupt 0000:00:1c.0[A] -> GSI 17 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:00:1c.0 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.0:pcie00]
Allocate Port Service[0000:00:1c.0:pcie03]
ACPI: PCI Interrupt 0000:00:1c.1[B] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:00:1c.1 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.1:pcie00]
Allocate Port Service[0000:00:1c.1:pcie02]
Allocate Port Service[0000:00:1c.1:pcie03]
ACPI: PCI Interrupt 0000:00:1c.2[C] -> GSI 18 (level, low) -> IRQ 185
PCI: Setting latency timer of device 0000:00:1c.2 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.2:pcie00]
Allocate Port Service[0000:00:1c.2:pcie02]
Allocate Port Service[0000:00:1c.2:pcie03]
ACPI: PCI Interrupt 0000:00:1c.3[D] -> GSI 19 (level, low) -> IRQ 193
PCI: Setting latency timer of device 0000:00:1c.3 to 64
assign_interrupt_mode Found MSI capability
Allocate Port Service[0000:00:1c.3:pcie00]
Allocate Port Service[0000:00:1c.3:pcie02]
Allocate Port Service[0000:00:1c.3:pcie03]
ACPI: Power Button (FF) [PWRF]
ACPI: Power Button (CM) [PWRB]
ACPI: Processor [CPU1] (supports 8 throttling states)
ACPI: Processor [CPU2] (supports 8 throttling states)
Real Time Clock Driver v1.12
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
ACPI: PCI Interrupt 0000:06:02.0[A] -> GSI 18 (level, low) -> IRQ 185
0000:06:02.0: ttyS1 at I/O 0xbc00 (irq = 185) is a 16550A
0000:06:02.0: ttyS2 at I/O 0xbc08 (irq = 185) is a 16550A
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
libata version 1.20 loaded.
ahci 0000:00:1f.2: version 1.2
ACPI: PCI Interrupt 0000:00:1f.2[B] -> GSI 19 (level, low) -> IRQ 193
PCI: Setting latency timer of device 0000:00:1f.2 to 64
ahci 0000:00:1f.2: AHCI 0001.0000 32 slots 4 ports 1.5 Gbps 0xf impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq led slum part
ata1: SATA max UDMA/133 cmd 0xF8804D00 ctl 0x0 bmdma 0x0 irq 193
ata2: SATA max UDMA/133 cmd 0xF8804D80 ctl 0x0 bmdma 0x0 irq 193
ata3: SATA max UDMA/133 cmd 0xF8804E00 ctl 0x0 bmdma 0x0 irq 193
ata4: SATA max UDMA/133 cmd 0xF8804E80 ctl 0x0 bmdma 0x0 irq 193
ata1: SATA link up 1.5 Gbps (SStatus 113)
ata1: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:007f
ata1: dev 0 ATA-6, max UDMA/133, 156301488 sectors: LBA48
ata1: dev 0 configured for UDMA/133
scsi0 : ahci
ata2: SATA link up 1.5 Gbps (SStatus 113)
ata2: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:007f
ata2: dev 0 ATA-6, max UDMA/133, 156301488 sectors: LBA48
ata2: dev 0 configured for UDMA/133
scsi1 : ahci
ata3: SATA link up 1.5 Gbps (SStatus 113)
ata3: dev 0 cfg 49:2f00 82:346b 83:7d01 84:4003 85:3469 86:3c01 87:4003 88:007f
ata3: dev 0 ATA-6, max UDMA/133, 156299375 sectors: LBA48
ata3: dev 0 configured for UDMA/133
scsi2 : ahci
ata4: SATA link down (SStatus 0)
scsi3 : ahci
   Vendor: ATA       Model: ST380817AS        Rev: 3.42
   Type:   Direct-Access                      ANSI SCSI revision: 05
   Vendor: ATA       Model: ST380817AS        Rev: 3.42
   Type:   Direct-Access                      ANSI SCSI revision: 05
   Vendor: ATA       Model: ST380013AS        Rev: 3.18
   Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 156301488 512-byte hdwr sectors (80026 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
  sda: sda1 sda2 sda3 sda4 < sda5 sda6 sda7 sda8 sda9 sda10 >
sd 0:0:0:0: Attached scsi disk sda
SCSI device sdb: 156301488 512-byte hdwr sectors (80026 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
SCSI device sdb: 156301488 512-byte hdwr sectors (80026 MB)
sdb: Write Protect is off
sdb: Mode Sense: 00 3a 00 00
SCSI device sdb: drive cache: write back
  sdb: sdb1 sdb2 sdb3 sdb4 < sdb5 sdb6 sdb7 sdb8 sdb9 sdb10 >
sd 1:0:0:0: Attached scsi disk sdb
SCSI device sdc: 156299375 512-byte hdwr sectors (80025 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
SCSI device sdc: 156299375 512-byte hdwr sectors (80025 MB)
sdc: Write Protect is off
sdc: Mode Sense: 00 3a 00 00
SCSI device sdc: drive cache: write back
  sdc: sdc1
sd 2:0:0:0: Attached scsi disk sdc
sd 0:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:0:0: Attached scsi generic sg1 type 0
sd 2:0:0:0: Attached scsi generic sg2 type 0
ACPI: PCI Interrupt 0000:00:1d.7[A] -> GSI 23 (level, low) -> IRQ 50
PCI: Setting latency timer of device 0000:00:1d.7 to 64
ehci_hcd 0000:00:1d.7: EHCI Host Controller
ehci_hcd 0000:00:1d.7: debug port 1
PCI: cache line size of 128 is not supported by device 0000:00:1d.7
ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 1
ehci_hcd 0000:00:1d.7: irq 50, io mem 0xff4ff800
ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 8 ports detected
USB Universal Host Controller Interface driver v3.0
ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 23 (level, low) -> IRQ 50
PCI: Setting latency timer of device 0000:00:1d.0 to 64
uhci_hcd 0000:00:1d.0: UHCI Host Controller
uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus number 2
uhci_hcd 0000:00:1d.0: irq 50, io base 0x0000cc00
usb usb2: configuration #1 chosen from 1 choice
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.1[B] -> GSI 19 (level, low) -> IRQ 193
PCI: Setting latency timer of device 0000:00:1d.1 to 64
uhci_hcd 0000:00:1d.1: UHCI Host Controller
uhci_hcd 0000:00:1d.1: new USB bus registered, assigned bus number 3
uhci_hcd 0000:00:1d.1: irq 193, io base 0x0000d000
usb usb3: configuration #1 chosen from 1 choice
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.2[C] -> GSI 18 (level, low) -> IRQ 185
PCI: Setting latency timer of device 0000:00:1d.2 to 64
uhci_hcd 0000:00:1d.2: UHCI Host Controller
uhci_hcd 0000:00:1d.2: new USB bus registered, assigned bus number 4
uhci_hcd 0000:00:1d.2: irq 185, io base 0x0000d400
usb usb4: configuration #1 chosen from 1 choice
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 2 ports detected
ACPI: PCI Interrupt 0000:00:1d.3[D] -> GSI 16 (level, low) -> IRQ 169
PCI: Setting latency timer of device 0000:00:1d.3 to 64
uhci_hcd 0000:00:1d.3: UHCI Host Controller
uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 5
uhci_hcd 0000:00:1d.3: irq 169, io base 0x0000d800
usb usb5: configuration #1 chosen from 1 choice
hub 5-0:1.0: USB hub found
hub 5-0:1.0: 2 ports detected
Initializing USB Mass Storage driver...
usb 5-1: new full speed USB device using uhci_hcd and address 2
usb 5-1: configuration #1 chosen from 1 choice
usb 5-2: new full speed USB device using uhci_hcd and address 3
usb 5-2: configuration #1 chosen from 1 choice
hub 5-2:1.0: USB hub found
hub 5-2:1.0: 4 ports detected
usb 5-2.1: new low speed USB device using uhci_hcd and address 4
usb 5-2.1: configuration #1 chosen from 1 choice
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
usbcore: registered new driver libusual
usbcore: registered new driver hiddev
input: Belkin Components Belkin OmniView KVM Switch as /class/input/input0
input: USB HID v1.00 Keyboard [Belkin Components Belkin OmniView KVM Switch] on 
usb-0000:00:1d.3-2.1
input: Belkin Components Belkin OmniView KVM Switch as /class/input/input1
input: USB HID v1.00 Mouse [Belkin Components Belkin OmniView KVM Switch] on 
usb-0000:00:1d.3-2.1
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.6:USB HID core driver
mice: PS/2 mouse device common for all mice
md: raid1 personality registered for level 1
md: md driver 0.90.3 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 4.39
NET: Registered protocol family 2
IP route cache hash table entries: 32768 (order: 5, 131072 bytes)
TCP established hash table entries: 131072 (order: 8, 1048576 bytes)
TCP bind hash table entries: 65536 (order: 7, 524288 bytes)
TCP: Hash tables configured (established 131072 bind 65536)
TCP reno registered
IPv4 over IPv4 tunneling driver
ip_conntrack version 2.4 (8177 buckets, 65416 max) - 212 bytes per conntrack
ip_tables: (C) 2000-2002 Netfilter core team
ipt_recent v0.3.1: Stephen Frost <sfrost@snowman.net>. 
http://snowman.net/projects/ipt_recent/
arp_tables: (C) 2002 David S. Miller
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
Starting balanced_irq
Using IPI Shortcut mode
md: Autodetecting RAID arrays.
md: autorun ...
md: considering sdb10 ...
md:  adding sdb10 ...
md: sdb7 has different UUID to sdb10
md: sdb6 has different UUID to sdb10
md: sdb5 has different UUID to sdb10
md: sdb3 has different UUID to sdb10
md: sdb2 has different UUID to sdb10
md:  adding sda10 ...
md: sda7 has different UUID to sdb10
md: sda6 has different UUID to sdb10
md: sda5 has different UUID to sdb10
md: sda3 has different UUID to sdb10
md: sda2 has different UUID to sdb10
md: created md5
md: bind<sda10>
md: bind<sdb10>
md: running: <sdb10><sda10>
raid1: raid set md5 active with 2 out of 2 mirrors
md5: bitmap initialized from disk: read 11/11 pages, set 3 bits, status: 0
created bitmap (161 pages) for device md5
md: considering sdb7 ...
md:  adding sdb7 ...
md: sdb6 has different UUID to sdb7
md: sdb5 has different UUID to sdb7
md: sdb3 has different UUID to sdb7
md: sdb2 has different UUID to sdb7
md:  adding sda7 ...
md: sda6 has different UUID to sdb7
md: sda5 has different UUID to sdb7
md: sda3 has different UUID to sdb7
md: sda2 has different UUID to sdb7
md: created md4
md: bind<sda7>
md: bind<sdb7>
md: running: <sdb7><sda7>
raid1: raid set md4 active with 2 out of 2 mirrors
md4: bitmap initialized from disk: read 4/4 pages, set 22 bits, status: 0
created bitmap (61 pages) for device md4
md: considering sdb6 ...
md:  adding sdb6 ...
md: sdb5 has different UUID to sdb6
md: sdb3 has different UUID to sdb6
md: sdb2 has different UUID to sdb6
md:  adding sda6 ...
md: sda5 has different UUID to sdb6
md: sda3 has different UUID to sdb6
md: sda2 has different UUID to sdb6
md: created md3
md: bind<sda6>
md: bind<sdb6>
md: running: <sdb6><sda6>
raid1: raid set md3 active with 2 out of 2 mirrors
md3: bitmap initialized from disk: read 1/1 pages, set 11 bits, status: 0
created bitmap (13 pages) for device md3
md: considering sdb5 ...
md:  adding sdb5 ...
md: sdb3 has different UUID to sdb5
md: sdb2 has different UUID to sdb5
md:  adding sda5 ...
md: sda3 has different UUID to sdb5
md: sda2 has different UUID to sdb5
md: created md2
md: bind<sda5>
md: bind<sdb5>
md: running: <sdb5><sda5>
raid1: raid set md2 active with 2 out of 2 mirrors
md2: bitmap initialized from disk: read 10/10 pages, set 202 bits, status: 0
created bitmap (150 pages) for device md2
md: considering sdb3 ...
md:  adding sdb3 ...
md: sdb2 has different UUID to sdb3
md:  adding sda3 ...
md: sda2 has different UUID to sdb3
md: created md1
md: bind<sda3>
md: bind<sdb3>
md: running: <sdb3><sda3>
raid1: raid set md1 active with 2 out of 2 mirrors
md1: bitmap initialized from disk: read 10/10 pages, set 39 bits, status: 0
created bitmap (150 pages) for device md1
md: considering sdb2 ...
md:  adding sdb2 ...
md:  adding sda2 ...
md: created md0
md: bind<sda2>
md: bind<sdb2>
md: running: <sdb2><sda2>
md: md0: raid array is not clean -- starting background reconstruction
raid1: raid set md0 active with 2 out of 2 mirrors
md0: bitmap initialized from disk: read 12/12 pages, set 33 bits, status: 0
created bitmap (187 pages) for device md0
md: ... autorun DONE.
md: syncing RAID array md0
md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc.
md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) 
for reconstruction.
md: using 128k window, over a total of 24410688 blocks.
ReiserFS: md0: found reiserfs format "3.6" with standard journal
ReiserFS: md0: using ordered data mode
md: md0: sync done.
ReiserFS: md0: journal params: device md0, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
RAID1 conf printout:
  --- wd:2 rd:2
ReiserFS: md0: checking transaction log (md0)
  disk 0, wo:0, o:1, dev:sda2
  disk 1, wo:0, o:1, dev:sdb2
ReiserFS: md0: Using r5 hash to sort names
VFS: Mounted root (reiserfs filesystem) readonly.
Freeing unused kernel memory: 200k freed
Write protecting the kernel read-only data: 339k
hw_random hardware driver 1.0.0 loaded
ICH6: IDE controller at PCI slot 0000:00:1f.1
ACPI: PCI Interrupt 0000:00:1f.1[A] -> GSI 18 (level, low) -> IRQ 185
ICH6: chipset revision 3
ICH6: not 100% native mode: will probe irqs later
     ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
     ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:pio, hdd:pio
Probing IDE interface ide0...
hda: _NEC DVD_RW ND-2510A, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Probing IDE interface ide1...
ACPI: PCI Interrupt 0000:04:00.0[A] -> GSI 17 (level, low) -> IRQ 177
PCI: Setting latency timer of device 0000:04:00.0 to 64
sky2 v0.11 addr 0xff720000 irq 177 Yukon-EC (0xb6) rev 1
sky2 eth0: addr 00:11:11:43:05:2f
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
kjournald starting.  Commit interval 5 seconds
EXT3 FS on sda1, internal journal
EXT3-fs: mounted filesystem with ordered data mode.
ReiserFS: md1: found reiserfs format "3.6" with standard journal
ReiserFS: md1: using ordered data mode
ReiserFS: md1: journal params: device md1, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
ReiserFS: md1: checking transaction log (md1)
ReiserFS: md1: Using r5 hash to sort names
ReiserFS: md2: found reiserfs format "3.6" with standard journal
ReiserFS: md2: using ordered data mode
ReiserFS: md2: journal params: device md2, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
ReiserFS: md2: checking transaction log (md2)
ReiserFS: md2: Using r5 hash to sort names
ReiserFS: md3: found reiserfs format "3.6" with standard journal
ReiserFS: md3: using ordered data mode
ReiserFS: md3: journal params: device md3, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
ReiserFS: md3: checking transaction log (md3)
ReiserFS: md3: Using r5 hash to sort names
ReiserFS: md4: found reiserfs format "3.6" with standard journal
ReiserFS: md4: using ordered data mode
ReiserFS: md4: journal params: device md4, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
ReiserFS: md4: checking transaction log (md4)
ReiserFS: md4: Using r5 hash to sort names
ReiserFS: md5: found reiserfs format "3.6" with standard journal
ReiserFS: md5: using ordered data mode
ReiserFS: md5: journal params: device md5, size 8192, journal first block 18, 
max trans len 1024, max batch 900, max
  commit age 30, max trans age 30
ReiserFS: md5: checking transaction log (md5)
ReiserFS: md5: Using r5 hash to sort names
ReiserFS: sda8: found reiserfs format "3.6" with standard journal
ReiserFS: sda8: using ordered data mode
ReiserFS: sda8: journal params: device sda8, size 8192, journal first block 18, 
max trans len 1024, max batch 900, m
ax commit age 30, max trans age 30
ReiserFS: sda8: checking transaction log (sda8)
ReiserFS: sda8: Using r5 hash to sort names
ReiserFS: sdb8: found reiserfs format "3.6" with standard journal
ReiserFS: sdb8: using ordered data mode
ReiserFS: sdb8: journal params: device sdb8, size 8192, journal first block 18, 
max trans len 1024, max batch 900, m
ax commit age 30, max trans age 30
ReiserFS: sdb8: checking transaction log (sdb8)
ReiserFS: sdb8: Using r5 hash to sort names
ReiserFS: sdc1: found reiserfs format "3.6" with standard journal
ReiserFS: sdc1: using ordered data mode
ReiserFS: sdc1: journal params: device sdc1, size 8192, journal first block 18, 
max trans len 1024, max batch 900, m
ax commit age 30, max trans age 30
ReiserFS: sdc1: checking transaction log (sdc1)
ReiserFS: sdc1: Using r5 hash to sort names
Adding 248968k swap on /dev/sda9.  Priority:-1 extents:1 across:248968k
Adding 248968k swap on /dev/sdb9.  Priority:-2 extents:1 across:248968k
sky2 eth0: enabling interface
sky2 eth0: phy interrupt status 0x1c00 0xbc0c
sky2 eth0: Link is up at 1000 Mbps, full duplex, flow control both
GRE over IPv4 tunneling driver
NET: Registered protocol family 10
IPv6 over IPv4 tunneling driver
eth0: no IPv6 routers present
i2c_adapter i2c-0: Unrecognized version/stepping 0x69 Defaulting to LM85.
Installing knfsd (copyright (C) 1996 okir@monad.swb.de).

Reuben


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
@ 2006-01-14 15:34 Brice Goglin
  2006-01-15  4:07 ` 2.6.15-mm4 Ingo Molnar
  0 siblings, 1 reply; 7+ messages in thread
From: Brice Goglin @ 2006-01-14 15:34 UTC (permalink / raw)
  To: Andrew Morton; +Cc: LKML

Hi Andrew,

I get the following badness when booting mm4 on my thinkpad T43:

hdaps: IBM ThinkPad T43 detected.
hdaps: initial latch check good (0x01).
Time: acpi_pm clocksource has been installed.
input: hdaps as /class/input/input3
hdaps: driver successfully loaded.
Non-volatile memory driver v1.2
Badness in __mutex_trylock_slowpath at kernel/mutex.c:281
 [<c01251cf>] mutex_trylock+0x5a/0xe7
 [<e09c02d2>] hdaps_inputdev_poll+0xd/0xbd [hdaps]
 [<c011befc>] run_timer_softirq+0x105/0x147
 [<c0118a0b>] __do_softirq+0x34/0x7d
 [<c0118a76>] do_softirq+0x22/0x26
 [<c0104a64>] do_IRQ+0x22/0x2a
 [<c01033ce>] common_interrupt+0x1a/0x20
kjournald starting.  Commit interval 5 seconds

Regards,
Brice

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
  2006-01-14 15:34 2.6.15-mm4 Brice Goglin
@ 2006-01-15  4:07 ` Ingo Molnar
  2006-01-15  4:24   ` 2.6.15-mm4 Brice Goglin
  0 siblings, 1 reply; 7+ messages in thread
From: Ingo Molnar @ 2006-01-15  4:07 UTC (permalink / raw)
  To: Brice Goglin; +Cc: Andrew Morton, LKML


* Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:

> Hi Andrew,
> 
> I get the following badness when booting mm4 on my thinkpad T43:
> 
> hdaps: IBM ThinkPad T43 detected.
> hdaps: initial latch check good (0x01).
> Time: acpi_pm clocksource has been installed.
> input: hdaps as /class/input/input3
> hdaps: driver successfully loaded.
> Non-volatile memory driver v1.2
> Badness in __mutex_trylock_slowpath at kernel/mutex.c:281
>  [<c01251cf>] mutex_trylock+0x5a/0xe7
>  [<e09c02d2>] hdaps_inputdev_poll+0xd/0xbd [hdaps]
>  [<c011befc>] run_timer_softirq+0x105/0x147
>  [<c0118a0b>] __do_softirq+0x34/0x7d
>  [<c0118a76>] do_softirq+0x22/0x26
>  [<c0104a64>] do_IRQ+0x22/0x2a
>  [<c01033ce>] common_interrupt+0x1a/0x20
> kjournald starting.  Commit interval 5 seconds

Could you try the patch below?

	Ingo

--
undo hdaps.c mutex conversion - hdaps_inputdev_poll() is used in an irq 
context.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
----
 drivers/hwmon/hdaps.c |   37 ++++++++++++++++++-------------------
 1 files changed, 18 insertions(+), 19 deletions(-)

Index: linux-2.6.15-mm4.q/drivers/hwmon/hdaps.c
===================================================================
--- linux-2.6.15-mm4.q.orig/drivers/hwmon/hdaps.c
+++ linux-2.6.15-mm4.q/drivers/hwmon/hdaps.c
@@ -33,7 +33,6 @@
 #include <linux/module.h>
 #include <linux/timer.h>
 #include <linux/dmi.h>
-#include <linux/mutex.h>
 #include <asm/io.h>
 
 #define HDAPS_LOW_PORT		0x1600	/* first port used by hdaps */
@@ -77,10 +76,10 @@ static u8 km_activity;
 static int rest_x;
 static int rest_y;
 
-static DEFINE_MUTEX(hdaps_mutex);
+static DECLARE_MUTEX(hdaps_sem);
 
 /*
- * __get_latch - Get the value from a given port.  Callers must hold hdaps_mutex.
+ * __get_latch - Get the value from a given port.  Callers must hold hdaps_sem.
  */
 static inline u8 __get_latch(u16 port)
 {
@@ -89,7 +88,7 @@ static inline u8 __get_latch(u16 port)
 
 /*
  * __check_latch - Check a port latch for a given value.  Returns zero if the
- * port contains the given value.  Callers must hold hdaps_mutex.
+ * port contains the given value.  Callers must hold hdaps_sem.
  */
 static inline int __check_latch(u16 port, u8 val)
 {
@@ -100,7 +99,7 @@ static inline int __check_latch(u16 port
 
 /*
  * __wait_latch - Wait up to 100us for a port latch to get a certain value,
- * returning zero if the value is obtained.  Callers must hold hdaps_mutex.
+ * returning zero if the value is obtained.  Callers must hold hdaps_sem.
  */
 static int __wait_latch(u16 port, u8 val)
 {
@@ -117,7 +116,7 @@ static int __wait_latch(u16 port, u8 val
 
 /*
  * __device_refresh - request a refresh from the accelerometer.  Does not wait
- * for refresh to complete.  Callers must hold hdaps_mutex.
+ * for refresh to complete.  Callers must hold hdaps_sem.
  */
 static void __device_refresh(void)
 {
@@ -131,7 +130,7 @@ static void __device_refresh(void)
 /*
  * __device_refresh_sync - request a synchronous refresh from the
  * accelerometer.  We wait for the refresh to complete.  Returns zero if
- * successful and nonzero on error.  Callers must hold hdaps_mutex.
+ * successful and nonzero on error.  Callers must hold hdaps_sem.
  */
 static int __device_refresh_sync(void)
 {
@@ -141,7 +140,7 @@ static int __device_refresh_sync(void)
 
 /*
  * __device_complete - indicate to the accelerometer that we are done reading
- * data, and then initiate an async refresh.  Callers must hold hdaps_mutex.
+ * data, and then initiate an async refresh.  Callers must hold hdaps_sem.
  */
 static inline void __device_complete(void)
 {
@@ -159,7 +158,7 @@ static int hdaps_readb_one(unsigned int 
 {
 	int ret;
 
-	mutex_lock(&hdaps_mutex);
+	down(&hdaps_sem);
 
 	/* do a sync refresh -- we need to be sure that we read fresh data */
 	ret = __device_refresh_sync();
@@ -170,7 +169,7 @@ static int hdaps_readb_one(unsigned int 
 	__device_complete();
 
 out:
-	mutex_unlock(&hdaps_mutex);
+	up(&hdaps_sem);
 	return ret;
 }
 
@@ -205,9 +204,9 @@ static int hdaps_read_pair(unsigned int 
 {
 	int ret;
 
-	mutex_lock(&hdaps_mutex);
+	down(&hdaps_sem);
 	ret = __hdaps_read_pair(port1, port2, val1, val2);
-	mutex_unlock(&hdaps_mutex);
+	up(&hdaps_sem);
 
 	return ret;
 }
@@ -220,7 +219,7 @@ static int hdaps_device_init(void)
 {
 	int total, ret = -ENXIO;
 
-	mutex_lock(&hdaps_mutex);
+	down(&hdaps_sem);
 
 	outb(0x13, 0x1610);
 	outb(0x01, 0x161f);
@@ -286,13 +285,13 @@ static int hdaps_device_init(void)
 	}
 
 out:
-	mutex_unlock(&hdaps_mutex);
+	up(&hdaps_sem);
 	return ret;
 }
 
 
 /*
- * hdaps_calibrate - Set our "resting" values.  Callers must hold hdaps_mutex.
+ * hdaps_calibrate - Set our "resting" values.  Callers must hold hdaps_sem.
  */
 static void hdaps_calibrate(void)
 {
@@ -304,7 +303,7 @@ static void hdaps_inputdev_poll(unsigned
 	int x, y;
 
 	/* Cannot sleep.  Try nonblockingly.  If we fail, try again later. */
-	if (!mutex_trylock(&hdaps_mutex)) {
+	if (down_trylock(&hdaps_sem)) {
 		mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
 		return;
 	}
@@ -319,7 +318,7 @@ static void hdaps_inputdev_poll(unsigned
 	mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
 
  out:
-	mutex_unlock(&hdaps_mutex);
+	up(&hdaps_sem);
 }
 
 
@@ -399,9 +398,9 @@ static ssize_t hdaps_calibrate_store(str
 				     struct device_attribute *attr,
 				     const char *buf, size_t count)
 {
-	mutex_lock(&hdaps_mutex);
+	down(&hdaps_sem);
 	hdaps_calibrate();
-	mutex_unlock(&hdaps_mutex);
+	up(&hdaps_sem);
 
 	return count;
 }

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
  2006-01-15  4:07 ` 2.6.15-mm4 Ingo Molnar
@ 2006-01-15  4:24   ` Brice Goglin
  2006-01-15  4:42     ` 2.6.15-mm4 Ingo Molnar
  0 siblings, 1 reply; 7+ messages in thread
From: Brice Goglin @ 2006-01-15  4:24 UTC (permalink / raw)
  To: Ingo Molnar; +Cc: Andrew Morton, LKML

Ingo Molnar wrote:

>* Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:
>
>  
>
>>Hi Andrew,
>>
>>I get the following badness when booting mm4 on my thinkpad T43:
>>
>>hdaps: IBM ThinkPad T43 detected.
>>hdaps: initial latch check good (0x01).
>>Time: acpi_pm clocksource has been installed.
>>input: hdaps as /class/input/input3
>>hdaps: driver successfully loaded.
>>Non-volatile memory driver v1.2
>>Badness in __mutex_trylock_slowpath at kernel/mutex.c:281
>> [<c01251cf>] mutex_trylock+0x5a/0xe7
>> [<e09c02d2>] hdaps_inputdev_poll+0xd/0xbd [hdaps]
>> [<c011befc>] run_timer_softirq+0x105/0x147
>> [<c0118a0b>] __do_softirq+0x34/0x7d
>> [<c0118a76>] do_softirq+0x22/0x26
>> [<c0104a64>] do_IRQ+0x22/0x2a
>> [<c01033ce>] common_interrupt+0x1a/0x20
>>kjournald starting.  Commit interval 5 seconds
>>    
>>
>
>Could you try the patch below?
>
>  
>

Yes, it does fix it. What's the bug ? The mutexes are supposed to work
where semaphores do, aren't they ?

Brice


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: 2.6.15-mm4
  2006-01-15  4:24   ` 2.6.15-mm4 Brice Goglin
@ 2006-01-15  4:42     ` Ingo Molnar
  0 siblings, 0 replies; 7+ messages in thread
From: Ingo Molnar @ 2006-01-15  4:42 UTC (permalink / raw)
  To: Brice Goglin; +Cc: Andrew Morton, LKML


* Brice Goglin <Brice.Goglin@ens-lyon.org> wrote:

> >Could you try the patch below?
> 
> Yes, it does fix it. What's the bug ? The mutexes are supposed to work 
> where semaphores do, aren't they ?

no, not always. We could introduce mutex_trylock_irqsafe() and 
mutex_unlock_irqsafe(), but it's probably not worth doing it - it's just 
3-4 cases so far, out of hundreds of mutex conversions.

	Ingo

^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2006-01-16  4:09 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
     [not found] <20060114055153.04684592.akpm@osdl.org>
2006-01-14 22:49 ` 2.6.15-mm4 Reuben Farrelly
2006-01-16  4:08   ` 2.6.15-mm4 Tejun Heo
2006-01-14 23:10 ` 2.6.15-mm4 Reuben Farrelly
2006-01-14 15:34 2.6.15-mm4 Brice Goglin
2006-01-15  4:07 ` 2.6.15-mm4 Ingo Molnar
2006-01-15  4:24   ` 2.6.15-mm4 Brice Goglin
2006-01-15  4:42     ` 2.6.15-mm4 Ingo Molnar

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