* Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
@ 2010-02-05 18:36 Christian Kujau
2010-02-05 20:01 ` David Miller
0 siblings, 1 reply; 7+ messages in thread
From: Christian Kujau @ 2010-02-05 18:36 UTC (permalink / raw)
To: linux-btrfs; +Cc: davem
When writing to a newly created btrfs (vanilla 2.6.33-rc6, sparc64) the
following messages are printed:
[28617.650231] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[28617.745783] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[28654.589492] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[28654.685036] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[28689.595394] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
...and so on. I've seen these "unaligned access at TPC" on sparc64
before[0], but they were not btrfs related. Btw, *reading* does not cause
these messages.
At one point and when lots of I/O was going on, the following appeared once, inbetween
the other messages:
[31419.847052] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
[31447.243224] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
[31447.338727] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
[33888.613296] btrfs: loop0 checksum verify failed on 39084032 wanted EAFC29EA found BBFFFFFF level 0
[34421.508271] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
[34421.603872] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
[34452.965546] Kernel unaligned access at TPC[102a3f18] btrfs_csum_final+0x38/0x60 [btrfs]
No messages from the backing device have been reported though, but I'm
not so sure about the system's RAM, so it might be a hardware issue after
all. I was not able to reproduce the "checksum verify failed" yet.
Full dmesg and .config: http://nerdbynature.de/bits/2.6.33-rc6/btrfs/
Christian.
[0] http://linux.derkeiler.com/Mailing-Lists/Kernel/2009-02/msg01327.html
--
BOFH excuse #369:
Virus transmitted from computer to sysadmins.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-05 18:36 Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 Christian Kujau
@ 2010-02-05 20:01 ` David Miller
2010-02-06 5:13 ` Christian Kujau
0 siblings, 1 reply; 7+ messages in thread
From: David Miller @ 2010-02-05 20:01 UTC (permalink / raw)
To: lists; +Cc: linux-btrfs
From: Christian Kujau <lists@nerdbynature.de>
Date: Fri, 5 Feb 2010 10:36:52 -0800 (PST)
> When writing to a newly created btrfs (vanilla 2.6.33-rc6, sparc64) the
> following messages are printed:
>
> [28617.650231] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [28617.745783] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [28654.589492] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [28654.685036] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [28689.595394] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
Can you rerun your test with the following patch applied?
It will obtain more information for the btrfs developers.
Thanks!
diff --git a/arch/sparc/kernel/unaligned_64.c b/arch/sparc/kernel/unaligned_64.c
index 378ca82..cbde2ea 100644
--- a/arch/sparc/kernel/unaligned_64.c
+++ b/arch/sparc/kernel/unaligned_64.c
@@ -283,6 +283,9 @@ static void log_unaligned(struct pt_regs *regs)
count++;
printk("Kernel unaligned access at TPC[%lx] %pS\n",
regs->tpc, (void *) regs->tpc);
+ printk("Caller [%lx:%pS]\n",
+ regs->u_regs[UREG_RETPC],
+ (void *) regs->u_regs[UREG_RETPC]);
}
}
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-05 20:01 ` David Miller
@ 2010-02-06 5:13 ` Christian Kujau
2010-02-06 5:32 ` David Miller
0 siblings, 1 reply; 7+ messages in thread
From: Christian Kujau @ 2010-02-06 5:13 UTC (permalink / raw)
To: linux-btrfs; +Cc: David Miller
On Fri, 5 Feb 2010 at 12:01, David Miller wrote:
> Can you rerun your test with the following patch applied?
> It will obtain more information for the btrfs developers.
Thanks, David! Here it is:
[ 1861.965178] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 1862.060546] Caller [100a6044:crc32c+0x44/0x80 [libcrc32c]]
[ 1862.126652] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 1862.221928] Caller [100a6044:crc32c+0x44/0x80 [libcrc32c]]
It's always libcrc32c and the numbers stay the same too. Full dmesg here:
http://nerdbynature.de/bits/2.6.33-rc6/btrfs/
HTH,
Christian.
--
BOFH excuse #37:
heavy gravity fluctuation, move computer to floor rapidly
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-06 5:13 ` Christian Kujau
@ 2010-02-06 5:32 ` David Miller
2010-02-06 6:28 ` Christian Kujau
0 siblings, 1 reply; 7+ messages in thread
From: David Miller @ 2010-02-06 5:32 UTC (permalink / raw)
To: lists; +Cc: linux-btrfs
From: Christian Kujau <lists@nerdbynature.de>
Date: Fri, 5 Feb 2010 21:13:00 -0800 (PST)
> On Fri, 5 Feb 2010 at 12:01, David Miller wrote:
>> Can you rerun your test with the following patch applied?
>> It will obtain more information for the btrfs developers.
>
> Thanks, David! Here it is:
>
> [ 1861.965178] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 1862.060546] Caller [100a6044:crc32c+0x44/0x80 [libcrc32c]]
> [ 1862.126652] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 1862.221928] Caller [100a6044:crc32c+0x44/0x80 [libcrc32c]]
>
> It's always libcrc32c and the numbers stay the same too. Full dmesg here:
> http://nerdbynature.de/bits/2.6.33-rc6/btrfs/
My debugging patch didn't work correctly.
Can you try using this one instead?
Thanks!
diff --git a/arch/sparc/kernel/unaligned_64.c b/arch/sparc/kernel/unaligned_64.c
index 378ca82..cbde2ea 100644
--- a/arch/sparc/kernel/unaligned_64.c
+++ b/arch/sparc/kernel/unaligned_64.c
@@ -283,6 +283,9 @@ static void log_unaligned(struct pt_regs *regs)
count++;
printk("Kernel unaligned access at TPC[%lx] %pS\n",
regs->tpc, (void *) regs->tpc);
+ printk("Caller [%lx:%pS]\n",
+ regs->tnpc,
+ (void *) regs->tnpc);
}
}
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-06 5:32 ` David Miller
@ 2010-02-06 6:28 ` Christian Kujau
2010-02-06 6:43 ` David Miller
0 siblings, 1 reply; 7+ messages in thread
From: Christian Kujau @ 2010-02-06 6:28 UTC (permalink / raw)
To: linux-btrfs; +Cc: David Miller
On Fri, 5 Feb 2010 at 21:32, David Miller wrote:
> My debugging patch didn't work correctly.
> Can you try using this one instead?
Hm, now it looks like this, but I don't know how it'd reveal more
information:
[ 210.707051] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 210.802236] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
[ 210.874620] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 210.969899] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
[ 228.724982] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 228.820220] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
[ 228.892286] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
[ 228.987851] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
I'm open for more patches :-)
Christian.
--
BOFH excuse #277:
Your Flux Capacitor has gone bad.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-06 6:28 ` Christian Kujau
@ 2010-02-06 6:43 ` David Miller
2010-02-08 21:46 ` Chris Mason
0 siblings, 1 reply; 7+ messages in thread
From: David Miller @ 2010-02-06 6:43 UTC (permalink / raw)
To: lists; +Cc: linux-btrfs
From: Christian Kujau <lists@nerdbynature.de>
Date: Fri, 5 Feb 2010 22:28:47 -0800 (PST)
> Hm, now it looks like this, but I don't know how it'd reveal more
> information:
>
> [ 210.707051] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 210.802236] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> [ 210.874620] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 210.969899] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> [ 228.724982] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 228.820220] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> [ 228.892286] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> [ 228.987851] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
>
> I'm open for more patches :-)
Confusing for me too. I'll try to think about this some more.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60
2010-02-06 6:43 ` David Miller
@ 2010-02-08 21:46 ` Chris Mason
0 siblings, 0 replies; 7+ messages in thread
From: Chris Mason @ 2010-02-08 21:46 UTC (permalink / raw)
To: David Miller; +Cc: lists, linux-btrfs
On Fri, Feb 05, 2010 at 10:43:10PM -0800, David Miller wrote:
> From: Christian Kujau <lists@nerdbynature.de>
> Date: Fri, 5 Feb 2010 22:28:47 -0800 (PST)
>
> > Hm, now it looks like this, but I don't know how it'd reveal more
> > information:
> >
> > [ 210.707051] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> > [ 210.802236] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> > [ 210.874620] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> > [ 210.969899] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> > [ 228.724982] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> > [ 228.820220] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> > [ 228.892286] Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 [btrfs]
> > [ 228.987851] Caller [10101f1c:btrfs_csum_final+0x3c/0x60 [btrfs]]
> >
> > I'm open for more patches :-)
>
> Confusing for me too. I'll try to think about this some more.
It is probably the directory code. I switched that to crc32c since
you tried things.
-chris
^ permalink raw reply [flat|nested] 7+ messages in thread
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2010-02-05 18:36 Kernel unaligned access at TPC[10101f18] btrfs_csum_final+0x38/0x60 Christian Kujau
2010-02-05 20:01 ` David Miller
2010-02-06 5:13 ` Christian Kujau
2010-02-06 5:32 ` David Miller
2010-02-06 6:28 ` Christian Kujau
2010-02-06 6:43 ` David Miller
2010-02-08 21:46 ` Chris Mason
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