linux-kernel - Re: [RFC] nvmet: Always remove processed AER elements from list

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Date:   Wed, 30 Oct 2019 19:58:32 +0000
From:   Chaitanya Kulkarni <Chaitanya.Kulkarni@....com>
To:     Daniel Wagner <dwagner@...e.de>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>
CC:     Sagi Grimberg <sagi@...mberg.me>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [RFC] nvmet: Always remove processed AER elements from list

On 10/30/2019 08:24 AM, Daniel Wagner wrote:
> Hi,
>
> I've got following oops:
>
> PID: 79413  TASK: ffff92f03a814ec0  CPU: 19  COMMAND: "kworker/19:2"
> #0 [ffffa5308b8c3c58] machine_kexec at ffffffff8e05dd02
> #1 [ffffa5308b8c3ca8] __crash_kexec at ffffffff8e12102a
> #2 [ffffa5308b8c3d68] crash_kexec at ffffffff8e122019
> #3 [ffffa5308b8c3d80] oops_end at ffffffff8e02e091
> #4 [ffffa5308b8c3da0] general_protection at ffffffff8e8015c5
>      [exception RIP: nvmet_async_event_work+94]
>      RIP: ffffffffc0d9a80e  RSP: ffffa5308b8c3e58  RFLAGS: 00010202
>      RAX: dead000000000100  RBX: ffff92dcbc7464b0  RCX: 0000000000000002
>      RDX: 0000000000040002  RSI: 38ffff92dc9814cf  RDI: ffff92f217722f20
>      RBP: ffff92dcbc746418   R8: 0000000000000000   R9: 0000000000000000
>      R10: 000000000000035b  R11: ffff92efb8dd2091  R12: ffff92dcbc7464a0
>      R13: ffff92dbe03a5f29  R14: 0000000000000000  R15: 0ffff92f92f26864
>      ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
> #5 [ffffa5308b8c3e78] process_one_work at ffffffff8e0a3b0c
> #6 [ffffa5308b8c3eb8] worker_thread at ffffffff8e0a41e7
> #7 [ffffa5308b8c3f10] kthread at ffffffff8e0a93af
> #8 [ffffa5308b8c3f50] ret_from_fork at ffffffff8e800235
>
> this maps to nvmet_async_event_results. So it looks like this function
> access a stale aen pointer:
>
> static u32 nvmet_async_event_result(struct nvmet_async_event *aen)
> {
>          return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16);
> }
Can you please explain the test setup ? Is that coming from the tests 
present in the blktests ? if so you can please provide test number ?