linux-kernel - 回复: [PATCH] workqueue: Make a warning when a pending delay work being re-init

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Message-ID: <SEYPR02MB5653EF3D5C5D02E3A1F6F08AA3B0A@SEYPR02MB5653.apcprd02.prod.outlook.com>
Date:   Thu, 16 Nov 2023 07:26:27 +0000
From:   黄再漾(Joyyoung Huang) 
        <huangzaiyang@...o.com>
To:     Tejun Heo <tj@...nel.org>
CC:     "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        ZaiYang Huang <hzy0719@....com>
Subject: 回复: [PATCH] workqueue: Make a warning when a pending delay work being re-init

>Hello,
>
>On Wed, Nov 15, 2023 at 07:34:27PM +0800, huangzaiyang wrote:
>> @@ -310,6 +326,7 @@ static inline unsigned int work_static(struct
>> work_struct *work) { return 0; }
>>
>>  #define __INIT_DELAYED_WORK(_work, _func, _tflags)                     \
>>         do {                                                            \
>> +               WARN_ON(delayed_work_pending(_work));                   \
>>                 INIT_WORK(&(_work)->work, (_func));                     \
>>                 __init_timer(&(_work)->timer,                           \
>>                              delayed_work_timer_fn,                     \
>
>As pointed out by others, as we don't know what's in the memory, this wouldn't really work. This kind of bugs should be caught by DEBUG_OBJECTS_WORK / DEBUG_OBJECTS_TIMERS, I think. It's not perfect as those aren't >usually turned on but catching this sort of errors does need tracking some information out of band.

Thanks, The initial values of variables on the heap and stack are indeed random. Give up this modification and will try to use DEBUG_OBJECTS_WORK / DEBUG_OBJECTS_TIMERS to reproduce the problem.
--
huangzaiyang
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