* [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
@ 2022-04-11 15:42 Guenter Roeck
2022-04-13 9:56 ` Greenman, Gregory
2022-04-23 6:33 ` Kalle Valo
0 siblings, 2 replies; 5+ messages in thread
From: Guenter Roeck @ 2022-04-11 15:42 UTC (permalink / raw)
To: linux-wireless
Cc: Luca Coelho, Kalle Valo, linux-kernel, netdev, Steven Rostedt,
Johannes Berg, Guenter Roeck, Gregory Greenman
In Chrome OS, a large number of crashes is observed due to corrupted timer
lists. Steven Rostedt pointed out that this usually happens when a timer
is freed while still active, and that the problem is often triggered
by code calling del_timer() instead of del_timer_sync() just before
freeing.
Steven also identified the iwlwifi driver as one of the possible culprits
since it does exactly that.
Reported-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Johannes Berg <johannes.berg@intel.com>
Cc: Gregory Greenman <gregory.greenman@intel.com>
Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API support")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
v1 (from RFC):
Removed Shahar S Matityahu from Cc: and added Gregory Greenman.
No functional change.
I thought about the need to add a mutex to protect the timer list, but
I convinced myself that it is not necessary because the code adding
the timer list and the code removing it should never be never executed
in parallel.
drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
index 866a33f49915..3237d4b528b5 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
@@ -371,7 +371,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans *trans)
struct iwl_dbg_tlv_timer_node *node, *tmp;
list_for_each_entry_safe(node, tmp, timer_list, list) {
- del_timer(&node->timer);
+ del_timer_sync(&node->timer);
list_del(&node->list);
kfree(node);
}
--
2.35.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
2022-04-11 15:42 [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing Guenter Roeck
@ 2022-04-13 9:56 ` Greenman, Gregory
2022-04-13 15:06 ` Sedat Dilek
2022-04-23 6:33 ` Kalle Valo
1 sibling, 1 reply; 5+ messages in thread
From: Greenman, Gregory @ 2022-04-13 9:56 UTC (permalink / raw)
To: kvalo
Cc: linux, linux-wireless, rostedt, Berg, Johannes, linux-kernel,
netdev, Coelho, Luciano
On Mon, 2022-04-11 at 08:42 -0700, Guenter Roeck wrote:
> In Chrome OS, a large number of crashes is observed due to corrupted
> timer
> lists. Steven Rostedt pointed out that this usually happens when a
> timer
> is freed while still active, and that the problem is often triggered
> by code calling del_timer() instead of del_timer_sync() just before
> freeing.
>
> Steven also identified the iwlwifi driver as one of the possible
> culprits
> since it does exactly that.
>
> Reported-by: Steven Rostedt <rostedt@goodmis.org>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Johannes Berg <johannes.berg@intel.com>
> Cc: Gregory Greenman <gregory.greenman@intel.com>
> Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API
> support")
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> ---
> v1 (from RFC):
> Removed Shahar S Matityahu from Cc: and added Gregory Greenman.
> No functional change.
>
> I thought about the need to add a mutex to protect the timer list,
> but
> I convinced myself that it is not necessary because the code adding
> the timer list and the code removing it should never be never
> executed
> in parallel.
>
> drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> index 866a33f49915..3237d4b528b5 100644
> --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> @@ -371,7 +371,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans
> *trans)
> struct iwl_dbg_tlv_timer_node *node, *tmp;
>
> list_for_each_entry_safe(node, tmp, timer_list, list) {
> - del_timer(&node->timer);
> + del_timer_sync(&node->timer);
> list_del(&node->list);
> kfree(node);
> }
Hi Kalle,
Can you please pick it up to wireless-drivers for the next rc?
It is an important fix.
Luca has already assigned it to you in patchwork.
Thanks!
Acked-by: Gregory Greenman <gregory.greenman@intel.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
2022-04-13 9:56 ` Greenman, Gregory
@ 2022-04-13 15:06 ` Sedat Dilek
2022-04-23 6:35 ` Kalle Valo
0 siblings, 1 reply; 5+ messages in thread
From: Sedat Dilek @ 2022-04-13 15:06 UTC (permalink / raw)
To: Greenman, Gregory
Cc: kvalo, linux, linux-wireless, rostedt, Berg, Johannes,
linux-kernel, netdev, Coelho, Luciano
On Wed, Apr 13, 2022 at 11:56 AM Greenman, Gregory
<gregory.greenman@intel.com> wrote:
>
>
> On Mon, 2022-04-11 at 08:42 -0700, Guenter Roeck wrote:
> > In Chrome OS, a large number of crashes is observed due to corrupted
> > timer
> > lists. Steven Rostedt pointed out that this usually happens when a
> > timer
> > is freed while still active, and that the problem is often triggered
> > by code calling del_timer() instead of del_timer_sync() just before
> > freeing.
> >
> > Steven also identified the iwlwifi driver as one of the possible
> > culprits
> > since it does exactly that.
> >
> > Reported-by: Steven Rostedt <rostedt@goodmis.org>
> > Cc: Steven Rostedt <rostedt@goodmis.org>
> > Cc: Johannes Berg <johannes.berg@intel.com>
> > Cc: Gregory Greenman <gregory.greenman@intel.com>
> > Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API
> > support")
> > Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> > ---
> > v1 (from RFC):
> > Removed Shahar S Matityahu from Cc: and added Gregory Greenman.
> > No functional change.
> >
> > I thought about the need to add a mutex to protect the timer list,
> > but
> > I convinced myself that it is not necessary because the code adding
> > the timer list and the code removing it should never be never
> > executed
> > in parallel.
> >
> > drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> > b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> > index 866a33f49915..3237d4b528b5 100644
> > --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> > +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
> > @@ -371,7 +371,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans
> > *trans)
> > struct iwl_dbg_tlv_timer_node *node, *tmp;
> >
> > list_for_each_entry_safe(node, tmp, timer_list, list) {
> > - del_timer(&node->timer);
> > + del_timer_sync(&node->timer);
> > list_del(&node->list);
> > kfree(node);
> > }
>
> Hi Kalle,
>
> Can you please pick it up to wireless-drivers for the next rc?
> It is an important fix.
> Luca has already assigned it to you in patchwork.
>
> Thanks!
>
> Acked-by: Gregory Greenman <gregory.greenman@intel.com>
I have tested this on top of Linux v5.17.3-rc1.
Feel free to add my...
Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # Linux v5.17.3-rc1 and
Debian LLVM-14
- Sedat -
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
2022-04-11 15:42 [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing Guenter Roeck
2022-04-13 9:56 ` Greenman, Gregory
@ 2022-04-23 6:33 ` Kalle Valo
1 sibling, 0 replies; 5+ messages in thread
From: Kalle Valo @ 2022-04-23 6:33 UTC (permalink / raw)
To: Guenter Roeck
Cc: linux-wireless, Luca Coelho, linux-kernel, netdev,
Steven Rostedt, Johannes Berg, Guenter Roeck, Gregory Greenman
Guenter Roeck <linux@roeck-us.net> wrote:
> In Chrome OS, a large number of crashes is observed due to corrupted timer
> lists. Steven Rostedt pointed out that this usually happens when a timer
> is freed while still active, and that the problem is often triggered
> by code calling del_timer() instead of del_timer_sync() just before
> freeing.
>
> Steven also identified the iwlwifi driver as one of the possible culprits
> since it does exactly that.
>
> Reported-by: Steven Rostedt <rostedt@goodmis.org>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Johannes Berg <johannes.berg@intel.com>
> Cc: Gregory Greenman <gregory.greenman@intel.com>
> Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API support")
> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
> Acked-by: Gregory Greenman <gregory.greenman@intel.com>
> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # Linux v5.17.3-rc1 and Debian LLVM-14
Patch applied to wireless.git, thanks.
7635a1ad8d92 iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
--
https://patchwork.kernel.org/project/linux-wireless/patch/20220411154210.1870008-1-linux@roeck-us.net/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing
2022-04-13 15:06 ` Sedat Dilek
@ 2022-04-23 6:35 ` Kalle Valo
0 siblings, 0 replies; 5+ messages in thread
From: Kalle Valo @ 2022-04-23 6:35 UTC (permalink / raw)
To: Sedat Dilek
Cc: Greenman, Gregory, linux, linux-wireless, rostedt, Berg,
Johannes, linux-kernel, netdev, Coelho, Luciano
Sedat Dilek <sedat.dilek@gmail.com> writes:
> On Wed, Apr 13, 2022 at 11:56 AM Greenman, Gregory
> <gregory.greenman@intel.com> wrote:
>>
>>
>> On Mon, 2022-04-11 at 08:42 -0700, Guenter Roeck wrote:
>> > In Chrome OS, a large number of crashes is observed due to corrupted
>> > timer
>> > lists. Steven Rostedt pointed out that this usually happens when a
>> > timer
>> > is freed while still active, and that the problem is often triggered
>> > by code calling del_timer() instead of del_timer_sync() just before
>> > freeing.
>> >
>> > Steven also identified the iwlwifi driver as one of the possible
>> > culprits
>> > since it does exactly that.
>> >
>> > Reported-by: Steven Rostedt <rostedt@goodmis.org>
>> > Cc: Steven Rostedt <rostedt@goodmis.org>
>> > Cc: Johannes Berg <johannes.berg@intel.com>
>> > Cc: Gregory Greenman <gregory.greenman@intel.com>
>> > Fixes: 60e8abd9d3e91 ("iwlwifi: dbg_ini: add periodic trigger new API
>> > support")
>> > Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>> > ---
>> > v1 (from RFC):
>> > Removed Shahar S Matityahu from Cc: and added Gregory Greenman.
>> > No functional change.
>> >
>> > I thought about the need to add a mutex to protect the timer list,
>> > but
>> > I convinced myself that it is not necessary because the code adding
>> > the timer list and the code removing it should never be never
>> > executed
>> > in parallel.
>> >
>> > drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c | 2 +-
>> > 1 file changed, 1 insertion(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
>> > b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
>> > index 866a33f49915..3237d4b528b5 100644
>> > --- a/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
>> > +++ b/drivers/net/wireless/intel/iwlwifi/iwl-dbg-tlv.c
>> > @@ -371,7 +371,7 @@ void iwl_dbg_tlv_del_timers(struct iwl_trans
>> > *trans)
>> > struct iwl_dbg_tlv_timer_node *node, *tmp;
>> >
>> > list_for_each_entry_safe(node, tmp, timer_list, list) {
>> > - del_timer(&node->timer);
>> > + del_timer_sync(&node->timer);
>> > list_del(&node->list);
>> > kfree(node);
>> > }
>>
>> Hi Kalle,
>>
>> Can you please pick it up to wireless-drivers for the next rc?
>> It is an important fix.
>> Luca has already assigned it to you in patchwork.
>>
>> Thanks!
>>
>> Acked-by: Gregory Greenman <gregory.greenman@intel.com>
>
> I have tested this on top of Linux v5.17.3-rc1.
>
> Feel free to add my...
>
> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # Linux v5.17.3-rc1 and
> Debian LLVM-14
Please keep the Tested-by in one line, otherwise patchwork cannot parse
it correctly. I fixed this manually during commit.
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-04-23 6:35 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2022-04-11 15:42 [PATCH] iwlwifi: iwl-dbg: Use del_timer_sync() before freeing Guenter Roeck
2022-04-13 9:56 ` Greenman, Gregory
2022-04-13 15:06 ` Sedat Dilek
2022-04-23 6:35 ` Kalle Valo
2022-04-23 6:33 ` Kalle Valo
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