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* Divide error in minstrel_ht_get_tp_avg()
@ 2021-05-29 16:57 Oleksandr Natalenko
  2021-06-07 14:52 ` Oleksandr Natalenko
  0 siblings, 1 reply; 4+ messages in thread
From: Oleksandr Natalenko @ 2021-05-29 16:57 UTC (permalink / raw)
  To: linux-kernel
  Cc: netdev, linux-wireless, Jakub Kicinski, David S. Miller,
	Johannes Berg, Felix Fietkau

Hello.

The following woe happened on my home router running as a Wi-Fi AP with
MT7612:

```
[16592.157962] divide error: 0000 [#1] PREEMPT SMP PTI
[16592.163169] CPU: 2 PID: 683 Comm: mt76-tx phy0 Tainted: G         C        5.12.0-pf4 #1
[16592.171745] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J3710-ITX, BIOS P1.50 04/16/2018
[16592.182155] RIP: 0010:minstrel_ht_get_tp_avg+0xb1/0x100 [mac80211]
[16592.188795] Code: 04 00 00 00 7f 1c 31 c9 81 fa f1 49 02 00 0f 9c c1 8d 0c cd 08 00 00 00 eb 08 8b 47 30 b9 01 00 00 00 69 c0 e8 03 00 00 31 d2 <f7> f1 ba 66 0e 00 00 39 d6 0f 4f f2 49 63 d1 48 8d 0c 52 48 8d 0c
[16592.208796] RSP: 0018:ffffb6a601293be8 EFLAGS: 00010246
[16592.214292] RAX: 000000000001a5e0 RBX: ffff9c658ee95170 RCX: 0000000000000000
[16592.222054] RDX: 0000000000000000 RSI: 0000000000000585 RDI: ffff9c658ee94000
[16592.229620] RBP: 0000000000000006 R08: 0000000000000006 R09: 0000000000000012
[16592.237254] R10: 0000000000000007 R11: 0000000000000000 R12: ffff9c658ee94000
[16592.244828] R13: 0000000000000012 R14: ffff9c658ee9534c R15: 0000000000000585
[16592.252635] FS:  0000000000000000(0000) GS:ffff9c66f8500000(0000) knlGS:0000000000000000
[16592.261086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[16592.267326] CR2: 0000555d81abe7b8 CR3: 0000000116c10000 CR4: 00000000001006e0
[16592.274904] Call Trace:
[16592.277549]  minstrel_ht_update_stats+0x1fe/0x1320 [mac80211]
[16592.283730]  minstrel_ht_tx_status+0x67f/0x710 [mac80211]
[16592.289442]  rate_control_tx_status+0x6e/0xb0 [mac80211]
[16592.295267]  ieee80211_tx_status_ext+0x22e/0xb00 [mac80211]
[16592.311290]  ieee80211_tx_status+0x7d/0xa0 [mac80211]
[16592.316714]  mt76_tx_status_unlock+0x83/0xa0 [mt76]
[16592.321999]  mt76x02_send_tx_status+0x1b7/0x400 [mt76x02_lib]
[16592.334516]  mt76x02_tx_worker+0x8f/0xd0 [mt76x02_lib]
[16592.340091]  __mt76_worker_fn+0x78/0xb0 [mt76]
[16592.345067]  kthread+0x183/0x1b0
[16592.353378]  ret_from_fork+0x22/0x30
```

`faddr2line` says it is this:

```
 430 int
 431 minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
 432                int prob_avg)
 433 {
…
 435     unsigned int ampdu_len = 1;
…
 441     if (minstrel_ht_is_legacy_group(group))
…
 443     else
 444         ampdu_len = minstrel_ht_avg_ampdu_len(mi);
…
 446     nsecs = 1000 * overhead / ampdu_len;
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
```

So, it seems `minstrel_ht_avg_ampdu_len()` can return 0, which is not
really legitimate.

Looking at `minstrel_ht_avg_ampdu_len()`, I see the following:

```
16:#define MINSTREL_SCALE  12
…
18:#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
```

```
 401 static unsigned int
 402 minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
 403 {
…
 406     if (mi->avg_ampdu_len)
 407         return MINSTREL_TRUNC(mi->avg_ampdu_len);
```

So, likely, `mi->avg_ampdu_len` is non-zero, but it's too small, hence
right bitshift makes it zero.

Should there be some protection against such a situation?

Felix, could you maybe check this? Looks like you were the last one to
overhaul that part of code.

Thanks!

-- 
  Oleksandr Natalenko (post-factum)

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Divide error in minstrel_ht_get_tp_avg()
  2021-05-29 16:57 Divide error in minstrel_ht_get_tp_avg() Oleksandr Natalenko
@ 2021-06-07 14:52 ` Oleksandr Natalenko
  2021-08-21 11:14   ` Oleksandr Natalenko
  0 siblings, 1 reply; 4+ messages in thread
From: Oleksandr Natalenko @ 2021-06-07 14:52 UTC (permalink / raw)
  To: linux-kernel
  Cc: netdev, linux-wireless, Jakub Kicinski, David S. Miller,
	Johannes Berg, Felix Fietkau

On Sat, May 29, 2021 at 06:57:29PM +0200, Oleksandr Natalenko wrote:
> The following woe happened on my home router running as a Wi-Fi AP with
> MT7612:
> 
> ```
> [16592.157962] divide error: 0000 [#1] PREEMPT SMP PTI
> [16592.163169] CPU: 2 PID: 683 Comm: mt76-tx phy0 Tainted: G         C        5.12.0-pf4 #1
> [16592.171745] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J3710-ITX, BIOS P1.50 04/16/2018
> [16592.182155] RIP: 0010:minstrel_ht_get_tp_avg+0xb1/0x100 [mac80211]
> [16592.188795] Code: 04 00 00 00 7f 1c 31 c9 81 fa f1 49 02 00 0f 9c c1 8d 0c cd 08 00 00 00 eb 08 8b 47 30 b9 01 00 00 00 69 c0 e8 03 00 00 31 d2 <f7> f1 ba 66 0e 00 00 39 d6 0f 4f f2 49 63 d1 48 8d 0c 52 48 8d 0c
> [16592.208796] RSP: 0018:ffffb6a601293be8 EFLAGS: 00010246
> [16592.214292] RAX: 000000000001a5e0 RBX: ffff9c658ee95170 RCX: 0000000000000000
> [16592.222054] RDX: 0000000000000000 RSI: 0000000000000585 RDI: ffff9c658ee94000
> [16592.229620] RBP: 0000000000000006 R08: 0000000000000006 R09: 0000000000000012
> [16592.237254] R10: 0000000000000007 R11: 0000000000000000 R12: ffff9c658ee94000
> [16592.244828] R13: 0000000000000012 R14: ffff9c658ee9534c R15: 0000000000000585
> [16592.252635] FS:  0000000000000000(0000) GS:ffff9c66f8500000(0000) knlGS:0000000000000000
> [16592.261086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [16592.267326] CR2: 0000555d81abe7b8 CR3: 0000000116c10000 CR4: 00000000001006e0
> [16592.274904] Call Trace:
> [16592.277549]  minstrel_ht_update_stats+0x1fe/0x1320 [mac80211]
> [16592.283730]  minstrel_ht_tx_status+0x67f/0x710 [mac80211]
> [16592.289442]  rate_control_tx_status+0x6e/0xb0 [mac80211]
> [16592.295267]  ieee80211_tx_status_ext+0x22e/0xb00 [mac80211]
> [16592.311290]  ieee80211_tx_status+0x7d/0xa0 [mac80211]
> [16592.316714]  mt76_tx_status_unlock+0x83/0xa0 [mt76]
> [16592.321999]  mt76x02_send_tx_status+0x1b7/0x400 [mt76x02_lib]
> [16592.334516]  mt76x02_tx_worker+0x8f/0xd0 [mt76x02_lib]
> [16592.340091]  __mt76_worker_fn+0x78/0xb0 [mt76]
> [16592.345067]  kthread+0x183/0x1b0
> [16592.353378]  ret_from_fork+0x22/0x30
> ```
> 
> `faddr2line` says it is this:
> 
> ```
>  430 int
>  431 minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
>  432                int prob_avg)
>  433 {
> …
>  435     unsigned int ampdu_len = 1;
> …
>  441     if (minstrel_ht_is_legacy_group(group))
> …
>  443     else
>  444         ampdu_len = minstrel_ht_avg_ampdu_len(mi);
> …
>  446     nsecs = 1000 * overhead / ampdu_len;
>          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> ```
> 
> So, it seems `minstrel_ht_avg_ampdu_len()` can return 0, which is not
> really legitimate.
> 
> Looking at `minstrel_ht_avg_ampdu_len()`, I see the following:
> 
> ```
> 16:#define MINSTREL_SCALE  12
> …
> 18:#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
> ```
> 
> ```
>  401 static unsigned int
>  402 minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
>  403 {
> …
>  406     if (mi->avg_ampdu_len)
>  407         return MINSTREL_TRUNC(mi->avg_ampdu_len);
> ```
> 
> So, likely, `mi->avg_ampdu_len` is non-zero, but it's too small, hence
> right bitshift makes it zero.
> 
> Should there be some protection against such a situation?
> 
> Felix, could you maybe check this? Looks like you were the last one to
> overhaul that part of code.

Quick hack from me:

commit a23d3f77658de968c5bb852ba478402c93958f7f
Author: Oleksandr Natalenko <oleksandr@natalenko.name>
Date:   Mon Jun 7 16:45:45 2021 +0200

    mac80211: minstrel_ht: force ampdu_len to be > 0
    
    This is a hack.
    
    Work around the following crash:
    
    ```
    divide error: 0000 [#1] PREEMPT SMP PTI
    CPU: 2 PID: 683 Comm: mt76-tx phy0 Tainted: G         C        5.12.0-pf4 #1
    Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./J3710-ITX, BIOS P1.50 04/16/2018
    RIP: 0010:minstrel_ht_get_tp_avg+0xb1/0x100 [mac80211]
    …
    Call Trace:
     minstrel_ht_update_stats+0x1fe/0x1320 [mac80211]
     minstrel_ht_tx_status+0x67f/0x710 [mac80211]
     rate_control_tx_status+0x6e/0xb0 [mac80211]
     ieee80211_tx_status_ext+0x22e/0xb00 [mac80211]
     ieee80211_tx_status+0x7d/0xa0 [mac80211]
     mt76_tx_status_unlock+0x83/0xa0 [mt76]
     mt76x02_send_tx_status+0x1b7/0x400 [mt76x02_lib]
     mt76x02_tx_worker+0x8f/0xd0 [mt76x02_lib]
     __mt76_worker_fn+0x78/0xb0 [mt76]
     kthread+0x183/0x1b0
     ret_from_fork+0x22/0x30
    ```
    
    Link: https://lore.kernel.org/lkml/20210529165728.bskaozwtmwxnvucx@spock.localdomain/
    Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
---
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index ecad9b10984f..6ad188c4101e 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -440,8 +440,13 @@ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int rate,
 
 	if (minstrel_ht_is_legacy_group(group))
 		overhead = mi->overhead_legacy;
-	else
+	else {
 		ampdu_len = minstrel_ht_avg_ampdu_len(mi);
+		if (unlikely(!ampdu_len)) {
+			pr_err_once("minstrel_ht_get_tp_avg: ampdu_len == 0!");
+			ampdu_len = 1;
+		}
+	}
 
 	nsecs = 1000 * overhead / ampdu_len;
 	nsecs += minstrel_mcs_groups[group].duration[rate] <<

-- 
  Oleksandr Natalenko (post-factum)

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Divide error in minstrel_ht_get_tp_avg()
  2021-06-07 14:52 ` Oleksandr Natalenko
@ 2021-08-21 11:14   ` Oleksandr Natalenko
  2021-08-21 12:19     ` Willy Tarreau
  0 siblings, 1 reply; 4+ messages in thread
From: Oleksandr Natalenko @ 2021-08-21 11:14 UTC (permalink / raw)
  To: linux-kernel
  Cc: netdev, linux-wireless, Jakub Kicinski, David S. Miller,
	Johannes Berg, Felix Fietkau, Lorenzo Bianconi, Ryder Lee,
	Kalle Valo

Hello.

On pondělí 7. června 2021 16:52:30 CEST Oleksandr Natalenko wrote:
> On Sat, May 29, 2021 at 06:57:29PM +0200, Oleksandr Natalenko wrote:
> > The following woe happened on my home router running as a Wi-Fi AP with
> > MT7612:
> > 
> > ```
> > [16592.157962] divide error: 0000 [#1] PREEMPT SMP PTI
> > [16592.163169] CPU: 2 PID: 683 Comm: mt76-tx phy0 Tainted: G         C    
> >    5.12.0-pf4 #1 [16592.171745] Hardware name: To Be Filled By O.E.M. To
> > Be Filled By O.E.M./J3710-ITX, BIOS P1.50 04/16/2018 [16592.182155] RIP:
> > 0010:minstrel_ht_get_tp_avg+0xb1/0x100 [mac80211] [16592.188795] Code: 04
> > 00 00 00 7f 1c 31 c9 81 fa f1 49 02 00 0f 9c c1 8d 0c cd 08 00 00 00 eb
> > 08 8b 47 30 b9 01 00 00 00 69 c0 e8 03 00 00 31 d2 <f7> f1 ba 66 0e 00 00
> > 39 d6 0f 4f f2 49 63 d1 48 8d 0c 52 48 8d 0c [16592.208796] RSP:
> > 0018:ffffb6a601293be8 EFLAGS: 00010246
> > [16592.214292] RAX: 000000000001a5e0 RBX: ffff9c658ee95170 RCX:
> > 0000000000000000 [16592.222054] RDX: 0000000000000000 RSI:
> > 0000000000000585 RDI: ffff9c658ee94000 [16592.229620] RBP:
> > 0000000000000006 R08: 0000000000000006 R09: 0000000000000012
> > [16592.237254] R10: 0000000000000007 R11: 0000000000000000 R12:
> > ffff9c658ee94000 [16592.244828] R13: 0000000000000012 R14:
> > ffff9c658ee9534c R15: 0000000000000585 [16592.252635] FS: 
> > 0000000000000000(0000) GS:ffff9c66f8500000(0000) knlGS:0000000000000000
> > [16592.261086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [16592.267326] CR2: 0000555d81abe7b8 CR3: 0000000116c10000 CR4:
> > 00000000001006e0 [16592.274904] Call Trace:
> > [16592.277549]  minstrel_ht_update_stats+0x1fe/0x1320 [mac80211]
> > [16592.283730]  minstrel_ht_tx_status+0x67f/0x710 [mac80211]
> > [16592.289442]  rate_control_tx_status+0x6e/0xb0 [mac80211]
> > [16592.295267]  ieee80211_tx_status_ext+0x22e/0xb00 [mac80211]
> > [16592.311290]  ieee80211_tx_status+0x7d/0xa0 [mac80211]
> > [16592.316714]  mt76_tx_status_unlock+0x83/0xa0 [mt76]
> > [16592.321999]  mt76x02_send_tx_status+0x1b7/0x400 [mt76x02_lib]
> > [16592.334516]  mt76x02_tx_worker+0x8f/0xd0 [mt76x02_lib]
> > [16592.340091]  __mt76_worker_fn+0x78/0xb0 [mt76]
> > [16592.345067]  kthread+0x183/0x1b0
> > [16592.353378]  ret_from_fork+0x22/0x30
> > ```
> > 
> > `faddr2line` says it is this:
> > 
> > ```
> > 
> >  430 int
> >  431 minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int group, int
> >  rate,
> >  432                int prob_avg)
> >  433 {
> > 
> > …
> > 
> >  435     unsigned int ampdu_len = 1;
> > 
> > …
> > 
> >  441     if (minstrel_ht_is_legacy_group(group))
> > 
> > …
> > 
> >  443     else
> >  444         ampdu_len = minstrel_ht_avg_ampdu_len(mi);
> > 
> > …
> > 
> >  446     nsecs = 1000 * overhead / ampdu_len;
> >  
> >          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> > 
> > ```
> > 
> > So, it seems `minstrel_ht_avg_ampdu_len()` can return 0, which is not
> > really legitimate.
> > 
> > Looking at `minstrel_ht_avg_ampdu_len()`, I see the following:
> > 
> > ```
> > 16:#define MINSTREL_SCALE  12
> > …
> > 18:#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
> > ```
> > 
> > ```
> > 
> >  401 static unsigned int
> >  402 minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
> >  403 {
> > 
> > …
> > 
> >  406     if (mi->avg_ampdu_len)
> >  407         return MINSTREL_TRUNC(mi->avg_ampdu_len);
> > 
> > ```
> > 
> > So, likely, `mi->avg_ampdu_len` is non-zero, but it's too small, hence
> > right bitshift makes it zero.
> > 
> > Should there be some protection against such a situation?
> > 
> > Felix, could you maybe check this? Looks like you were the last one to
> > overhaul that part of code.
> 
> Quick hack from me:
> 
> commit a23d3f77658de968c5bb852ba478402c93958f7f
> Author: Oleksandr Natalenko <oleksandr@natalenko.name>
> Date:   Mon Jun 7 16:45:45 2021 +0200
> 
>     mac80211: minstrel_ht: force ampdu_len to be > 0
> 
>     This is a hack.
> 
>     Work around the following crash:
> 
>     ```
>     divide error: 0000 [#1] PREEMPT SMP PTI
>     CPU: 2 PID: 683 Comm: mt76-tx phy0 Tainted: G         C       
> 5.12.0-pf4 #1 Hardware name: To Be Filled By O.E.M. To Be Filled By
> O.E.M./J3710-ITX, BIOS P1.50 04/16/2018 RIP:
> 0010:minstrel_ht_get_tp_avg+0xb1/0x100 [mac80211]
>     …
>     Call Trace:
>      minstrel_ht_update_stats+0x1fe/0x1320 [mac80211]
>      minstrel_ht_tx_status+0x67f/0x710 [mac80211]
>      rate_control_tx_status+0x6e/0xb0 [mac80211]
>      ieee80211_tx_status_ext+0x22e/0xb00 [mac80211]
>      ieee80211_tx_status+0x7d/0xa0 [mac80211]
>      mt76_tx_status_unlock+0x83/0xa0 [mt76]
>      mt76x02_send_tx_status+0x1b7/0x400 [mt76x02_lib]
>      mt76x02_tx_worker+0x8f/0xd0 [mt76x02_lib]
>      __mt76_worker_fn+0x78/0xb0 [mt76]
>      kthread+0x183/0x1b0
>      ret_from_fork+0x22/0x30
>     ```
> 
>     Link:
> https://lore.kernel.org/lkml/20210529165728.bskaozwtmwxnvucx@spock.localdom
> ain/ Signed-off-by: Oleksandr Natalenko <oleksandr@natalenko.name>
> ---
> diff --git a/net/mac80211/rc80211_minstrel_ht.c
> b/net/mac80211/rc80211_minstrel_ht.c index ecad9b10984f..6ad188c4101e
> 100644
> --- a/net/mac80211/rc80211_minstrel_ht.c
> +++ b/net/mac80211/rc80211_minstrel_ht.c
> @@ -440,8 +440,13 @@ minstrel_ht_get_tp_avg(struct minstrel_ht_sta *mi, int
> group, int rate,
> 
>  	if (minstrel_ht_is_legacy_group(group))
>  		overhead = mi->overhead_legacy;
> -	else
> +	else {
>  		ampdu_len = minstrel_ht_avg_ampdu_len(mi);
> +		if (unlikely(!ampdu_len)) {
> +			pr_err_once("minstrel_ht_get_tp_avg: ampdu_len == 0!");
> +			ampdu_len = 1;
> +		}
> +	}
> 
>  	nsecs = 1000 * overhead / ampdu_len;
>  	nsecs += minstrel_mcs_groups[group].duration[rate] <<

I've also found out that this happens exactly at midnight, IOW, at 00:00:00. 
Not every midnight, though.

Does it have something to do with timekeeping? This is strange, I wouldn't 
expect kernel to act like that. Probably, some client sends malformed frame? 
How to find out?

Thanks.

P.S. The hack works, BTW, the system survives, and AP runs as if nothing 
happened.

-- 
Oleksandr Natalenko (post-factum)



^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: Divide error in minstrel_ht_get_tp_avg()
  2021-08-21 11:14   ` Oleksandr Natalenko
@ 2021-08-21 12:19     ` Willy Tarreau
  0 siblings, 0 replies; 4+ messages in thread
From: Willy Tarreau @ 2021-08-21 12:19 UTC (permalink / raw)
  To: Oleksandr Natalenko
  Cc: linux-kernel, netdev, linux-wireless, Jakub Kicinski,
	David S. Miller, Johannes Berg, Felix Fietkau, Lorenzo Bianconi,
	Ryder Lee, Kalle Valo

On Sat, Aug 21, 2021 at 01:14:34PM +0200, Oleksandr Natalenko wrote:
> > > So, it seems `minstrel_ht_avg_ampdu_len()` can return 0, which is not
> > > really legitimate.
> > > 
> > > Looking at `minstrel_ht_avg_ampdu_len()`, I see the following:
> > > 
> > > ```
> > > 16:#define MINSTREL_SCALE  12
> > > ...
> > > 18:#define MINSTREL_TRUNC(val) ((val) >> MINSTREL_SCALE)
> > > ```
> > > 
> > > ```
> > > 
> > >  401 static unsigned int
> > >  402 minstrel_ht_avg_ampdu_len(struct minstrel_ht_sta *mi)
> > >  403 {
> > > 
> > > ...
> > > 
> > >  406     if (mi->avg_ampdu_len)
> > >  407         return MINSTREL_TRUNC(mi->avg_ampdu_len);
> > > 
> > > ```
> > > 
> > > So, likely, `mi->avg_ampdu_len` is non-zero, but it's too small, hence
> > > right bitshift makes it zero.
(...)
> I've also found out that this happens exactly at midnight, IOW, at 00:00:00. 
> Not every midnight, though.
> 
> Does it have something to do with timekeeping? This is strange, I wouldn't 
> expect kernel to act like that. Probably, some client sends malformed frame? 
> How to find out?

Well, in minstrel_ht_update_stats() at line 1006 avg_ampdu_len is
explicitly set to zero. And this seems to be called based on timing
criteria from minstrel_ht_tx_status() so this could confirm your
experience.  Thus there is some inconsistency there.

Willy

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-08-21 12:19 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-29 16:57 Divide error in minstrel_ht_get_tp_avg() Oleksandr Natalenko
2021-06-07 14:52 ` Oleksandr Natalenko
2021-08-21 11:14   ` Oleksandr Natalenko
2021-08-21 12:19     ` Willy Tarreau

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