lkrg-users - Re:deadlock happen on p_rb_hash[i].p

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Message-ID: <7b644875.48d8.17aaa3a110a.Coremail.hyouyan@126.com>
Date: Thu, 15 Jul 2021 20:52:49 +0800 (CST)
From: youyan  <hyouyan@....com>
To: lkrg-users@...ts.openwall.com
Subject: Re:deadlock happen on p_rb_hash[i].p_lock.lock

Hi all
     I am sorry ,do not notice picture can not direct dispaly on mail list。I also describe it in words.
  cpu0 cpu1 wait for the lock ,which is holded on cpu2.
  cpu2 wait kretprobe_table_locks[hash].lock which is hold cpu3
  cpu3 wait for the p_rb_hash[i].p_lock.lock.
  the value of p_rb_hash[i].p_lock.lock is 0x01. 0x01 also mean this lock is holded throuh read lock.
   


















在 2021-07-15 20:20:50，"youyan" <hyouyan@....com> 写道：

Hi all
       I met a deadlock issue, p_rb_hash[i].p_lock.lock is not unlocked. lkrg version is 0.8,  software is android  10 ,hardware is unisoc SL8541E。
 fellow picture is trace32 stack callback and register。
 1：cpu 0




2：cpu1
3：cpu 2
4：cpu3 


     Above situation,I think where use read_lock for p_rb_hash[i].p_lock.lock ,but not unlock.Or after lock,there is some code may cause schedule. Go throuh lkrg code, I can not find this situation code.
Repeating this issue need at least two weeks. 
    Have anybody met this similar issue??


thanks and best regards
ethan















 





 
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