linux-kernel - Re: [PATCH v10 1/4] fpga: add an initial KUnit suite for the FPGA Manager

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Message-ID: <c8491399-556a-e55c-e815-4f0dd61c3b82@redhat.com>
Date:   Mon, 25 Sep 2023 17:21:03 +0200
From:   Marco Pagani <marpagan@...hat.com>
To:     Ruan Jinjie <ruanjinjie@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-fpga@...r.kernel.org,
        Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>
Subject: Re: [PATCH v10 1/4] fpga: add an initial KUnit suite for the FPGA
 Manager



On 2023-09-25 03:36, Ruan Jinjie wrote:
> 
> 
> On 1970/1/1 8:00, Marco Pagani wrote:
>> The suite tests the basic behaviors of the FPGA Manager including
>> programming using a single contiguous buffer and a scatter gather table.
>>
>> Signed-off-by: Marco Pagani <marpagan@...hat.com>

[...]

> modprobe fpga-mgr-test and then the below null-ptr-deref occurs.
> It seems that ctx->pdev->dev->driver is NULL and the pdev->dev need
> to be associated with a platform driver.

Hi, thanks for reporting the issue. I had not noticed it since it does not
happen when running the tests on UML. I will send a fix soon.

Marco


>      general protection fault, probably for non-canonical address
> 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN
>      KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
>      CPU: 4 PID: 1866 Comm: kunit_try_catch Tainted: G                 N
> 6.6.0-rc2+ #49
>      Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> 1.15.0-1 04/01/2014
>      RIP: 0010:fpga_mgr_get+0x87/0xd0 [fpga_mgr]
>      Code: 48 8d 7b 68 48 89 fa 48 c1 ea 03 80 3c 02 00 75 59 48 b8 00
> 00 00 00 00 fc ff df 48 8b 5b 68 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80>
> 3c 02 00 75 33 48 8b 7b 10 e8 7a 43 1a e1 84 c0 74 08 4c 89 e0
>      RSP: 0018:ffff8881054cfe18 EFLAGS: 00010202
>      RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83f6a96c
>      RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010
>      RBP: ffff88810d185808 R08: 0000000000000001 R09: ffffed1020d107ca
>      R10: ffff888106883e53 R11: ffff8881054cfa50 R12: ffff88810d185800
>      R13: ffff888106408520 R14: ffff88810683f5a8 R15: ffff888105e4b080
>      FS:  0000000000000000(0000) GS:ffff888119e00000(0000)
> knlGS:0000000000000000
>      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>      CR2: 00007f537e5ed8a0 CR3: 0000000005086001 CR4: 0000000000770ee0
>      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>      DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>      PKRU: 55555554
>      Call Trace:
>       <TASK>
>       ? die_addr+0x3d/0xa0
>       ? exc_general_protection+0x144/0x220
>       ? asm_exc_general_protection+0x22/0x30
>       ? kobject_put+0x5c/0x310
>       ? fpga_mgr_get+0x87/0xd0 [fpga_mgr]
>       ? fpga_mgr_get+0x28/0xd0 [fpga_mgr]
>       fpga_mgr_test_get+0xb4/0x1b0 [fpga_mgr_test]
>       ? platform_device_register_resndata.constprop.0+0xc0/0xc0
> [fpga_mgr_test]
>       ? fpga_mgr_test_lock+0x1f0/0x1f0 [fpga_mgr_test]
>       ? __sched_text_end+0xa/0xa
>       ? kunit_try_run_case+0xdd/0x250
>       ? kunit_try_run_case_cleanup+0xe0/0xe0
>       kunit_generic_run_threadfn_adapter+0x4a/0x90
>       ? kunit_try_catch_throw+0x80/0x80
>       kthread+0x2b5/0x380
>       ? kthread_complete_and_exit+0x20/0x20
>       ret_from_fork+0x2d/0x70
>       ? kthread_complete_and_exit+0x20/0x20
>       ret_from_fork_asm+0x11/0x20
>       </TASK>
>      Modules linked in: fpga_mgr_test(+) fpga_mgr
>      Dumping ftrace buffer:
>         (ftrace buffer empty)
>      ---[ end trace 0000000000000000 ]---
>      RIP: 0010:fpga_mgr_get+0x87/0xd0 [fpga_mgr]
>      Code: 48 8d 7b 68 48 89 fa 48 c1 ea 03 80 3c 02 00 75 59 48 b8 00
> 00 00 00 00 fc ff df 48 8b 5b 68 48 8d 7b 10 48 89 fa 48 c1 ea 03 <80>
> 3c 02 00 75 33 48 8b 7b 10 e8 7a 43 1a e1 84 c0 74 08 4c 89 e0
>      RSP: 0018:ffff8881054cfe18 EFLAGS: 00010202
>      RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83f6a96c
>      RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000010
>      RBP: ffff88810d185808 R08: 0000000000000001 R09: ffffed1020d107ca
>      R10: ffff888106883e53 R11: ffff8881054cfa50 R12: ffff88810d185800
>      R13: ffff888106408520 R14: ffff88810683f5a8 R15: ffff888105e4b080
>      FS:  0000000000000000(0000) GS:ffff888119e00000(0000)
> knlGS:0000000000000000
>      CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>      CR2: 00007f537e5ed8a0 CR3: 0000000005086001 CR4: 0000000000770ee0
>      DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>      DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>      PKRU: 55555554
>      Kernel panic - not syncing: Fatal exception
>      Dumping ftrace buffer:
>         (ftrace buffer empty)
>      Kernel Offset: disabled
>      Rebooting in 1 seconds..
> 
>     Fixes: ccbc1c302115 ("fpga: add an initial KUnit suite for the FPGA
> Manager")
>     Reported-by: Jinjie Ruan <ruanjinjie@...wei.com>
>

[...]