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Date:   Mon, 27 May 2019 15:16:07 +0200
From:   =?UTF-8?Q?Noralf_Tr=C3=B8nnes?= <notro@tronnes.org>
To:     Tony Lindgren <tony@atomide.com>
Cc:     Sebastian Reichel <sre@kernel.org>, Pavel Machek <pavel@ucw.cz>,
        kernel list <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-omap@vger.kernel.org, nekit1000@gmail.com, mpartap@gmx.net,
        merlijn@wizzup.org,
        =?UTF-8?Q?No?= =?UTF-8?Q?ralf_Tr=C3=B8nnes?= <noralf@tronnes.org>,
        Mark Brown <broonie@kernel.org>, linux-spi@vger.kernel.org
Subject: Re: 5.2-rc1 on droid4: spi crash
In-Reply-To: <20190527055343.GG5447@atomide.com>
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 <20190523093325.6si5jpvrvyktpax6@earth.universe>
 <20190527055343.GG5447@atomide.com>
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Den 2019-05-27 07:53, skrev Tony Lindgren:
> Hi,
> 
> * Sebastian Reichel <sre@kernel.org> [190523 09:33]:
>> Hi,
>> 
>> On Thu, May 23, 2019 at 11:09:26AM +0200, Pavel Machek wrote:
>> > This was greeting me overnight... I don't yet know how reproducible it
>> > is, it happened once so far.
>> 
>> Please pipe the stacktrace into ./scripts/decode_stacktrace.sh
>> to get a readable stacktrace, otherwise this is pretty much useless.
>> FWIW the only SPI device in the Droid 4 is the PMIC.
> 
> I've seen this too, and looks like reverting commit c9ba7a16d0f1
> ("spi: Release spi_res after finalizing message") fixes it based
> several days of testing.
> 
> Noralf and Mark, any ideas what needs to be fixed here?

Mark has a revert in his for-5.2 branch:
spi: Fix Raspberry Pi breakage
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/commit/?h=for-5.2&id=0ed56252c9567351344cb7b5cff6140e1bcec943

I don't know when or if he has sent a pull request.
Sorry about the breakage.

Noralf.

> 
> Below is the stacktrace I see without c9ba7a16d0f1 reverted,
> not sure how to reproduce but it seems to happen within about
> one to two days of uptime.
> 
> Regards,
> 
> Tony
> 
> 8< -----------------
> Unable to handle kernel NULL pointer dereference at virtual address 
> 00000008
> pgd = 829f0a5b
> [00000008] *pgd=00000000
> Internal error: Oops: 80000005 [#1] SMP ARM
> ...
> CPU: 0 PID: 71 Comm: spi0 Tainted: G        W         5.2.0-rc1+ #5983
> Hardware name: Generic OMAP4 (Flattened Device Tree)
> PC is at 0x8
> LR is at spi_res_release+0x54/0x80
> pc : [<00000008>]    lr : [<c06faa48>]    psr: 20000113
> sp : ed6e3e88  ip : ed6e3eb0  fp : ed6e3eac
> r10: c0b9eca8  r9 : 00000100  r8 : 00000200
> r7 : ed65bc00  r6 : ed6e5d3c  r5 : ed6e5d0c  r4 : c0d05254
> r3 : 00000008  r2 : c0d05264  r1 : ed6e5d0c  r0 : ed65bc00
> Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> Control: 10c5387d  Table: abf3c04a  DAC: 00000051
> Process spi0 (pid: 71, stack limit = 0x0ef66f65)
> Stack: (0xed6e3e88 to 0xed6e4000)
> 3e80:                   ed6e5cd0 ed6e5d0c ed65bc00 c0daf080 00000000 
> ed510410
> 3ea0: ed6e3eec ed6e3eb0 c06fd8c4 c06faa00 ed65b800 00000000 ed65ba20 
> ed65bee0
> 3ec0: ed6e3eec ed65bc00 ed6e5cd0 ed6e5d0c 00000000 ed510410 ed510410 
> 00000001
> 3ee0: ed6e3f2c ed6e3ef0 c06fdcd4 c06fd560 00000004 c0170948 ed6e3f20 
> ed65bdfc
> 3f00: ffffe000 ed65be68 ed65be44 ffffe000 c0dc7734 ed65be48 c0166f88 
> 00000000
> 3f20: ed6e3f3c ed6e3f30 c06fe10c c06fd9a4 ed6e3f74 ed6e3f40 c0166f54 
> c06fe0f8
> 3f40: ed6e3f74 6eb8f9ff c0166780 00000000 ed3bccc0 ed659c00 ed6e2000 
> ed65be44
> 3f60: c0166eac ed115c44 ed6e3fac ed6e3f78 c0166e58 c0166eb8 ed3bccdc 
> ed3bccdc
> 3f80: ed6e3fac ed659c00 c0166cf8 00000000 00000000 00000000 00000000 
> 00000000
> 3fa0: 00000000 ed6e3fb0 c01010e8 c0166d04 00000000 00000000 00000000 
> 00000000
> 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
> 00000000
> 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000 00000000 
> 00000000
> Backtrace:
> [<c06fa9f4>] (spi_res_release) from [<c06fd8c4>]
> (spi_transfer_one_message+0x370/0x444)
>  r9:ed510410 r8:00000000 r7:c0daf080 r6:ed65bc00 r5:ed6e5d0c 
> r4:ed6e5cd0
> [<c06fd554>] (spi_transfer_one_message) from [<c06fdcd4>]
> (__spi_pump_messages+0x33c/0x754)
>  r10:00000001 r9:ed510410 r8:ed510410 r7:00000000 r6:ed6e5d0c 
> r5:ed6e5cd0
>  r4:ed65bc00
> [<c06fd998>] (__spi_pump_messages) from [<c06fe10c>]
> (spi_pump_messages+0x20/0x24)
>  r10:00000000 r9:c0166f88 r8:ed65be48 r7:c0dc7734 r6:ffffe000 
> r5:ed65be44
>  r4:ed65be68
> [<c06fe0ec>] (spi_pump_messages) from [<c0166f54>]
> (kthread_worker_fn+0xa8/0x268)
> [<c0166eac>] (kthread_worker_fn) from [<c0166e58>] 
> (kthread+0x160/0x178)
>  r10:ed115c44 r9:c0166eac r8:ed65be44 r7:ed6e2000 r6:ed659c00 
> r5:ed3bccc0
>  r4:00000000
> [<c0166cf8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c)
> Exception stack(0xed6e3fb0 to 0xed6e3ff8)
> 3fa0:                                     00000000 00000000 00000000 
> 00000000
> 3fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 
> 00000000
> 3fe0: 00000000 00000000 00000000 00000000 00000013 00000000
>  r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 
> r5:c0166cf8
>  r4:ed659c00
> Code: bad PC value
> ---[ end trace a8011e9722dfda5e ]---