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Date: Thu, 15 Jul 2021 19:39:45 +0200
From: Adam Zabrocki <pi3@....com.pl>
To: lkrg-users@...ts.openwall.com
Subject: Re: Re:deadlock happen on
p_rb_hash[i].p_lock.lock
Can you try LKRG from git TOT ?
On Thu, Jul 15, 2021 at 08:52:49PM +0800, youyan wrote:
> 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.
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> 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
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> 2：cpu1
> 3：cpu 2
> 4：cpu3
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> 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??
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> thanks and best regards
> ethan
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--
pi3 (pi3ki31ny) - pi3 (at) itsec pl
http://pi3.com.pl
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