linux-kernel - Re: next: ltp: fs: read_all: block sda: the capability attribute has been deprecated. - supervisor instruction fetch in kernel mode

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Message-Id: <89dfc918-9757-4487-aa72-615f7029f6c1@app.fastmail.com>
Date:   Wed, 21 Jun 2023 16:08:50 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Naresh Kamboju" <naresh.kamboju@...aro.org>,
        "open list" <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, lkft-triage@...ts.linaro.org,
        linux-block <linux-block@...r.kernel.org>,
        "LTP List" <ltp@...ts.linux.it>, linux-mm <linux-mm@...ck.org>,
        "Rahul Rameshbabu" <rrameshbabu@...dia.com>,
        "Richard Cochran" <richardcochran@...il.com>
Cc:     "Alexander Viro" <viro@...iv.linux.org.uk>,
        "Christian Brauner" <brauner@...nel.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        "Dan Carpenter" <dan.carpenter@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Maciek Machnikowski" <maciek@...hnikowski.net>,
        "Richard Cochran" <richardcochran@...il.com>,
        "Shuah Khan" <shuah@...nel.org>, "Jakub Kicinski" <kuba@...nel.org>
Subject: Re: next: ltp: fs: read_all: block sda: the capability attribute has been
 deprecated. - supervisor instruction fetch in kernel mode

On Wed, Jun 21, 2023, at 16:01, Naresh Kamboju wrote:
> While running LTP fs testing on x86_64 device the following kernel BUG:
> notice with Linux next-20230621.
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> Steps to reproduce:
>
> # cd /opt/ltp
> # ./runltp -f fs
>
> Test log:
> ======
> read_all.c:687: TPASS: Finished reading files
> Summary:
> passed   1
> failed   0
> broken   0
> skipped  0
> warnings 0
> tst_test.c:1558: TINFO: Timeout per run is 0h 06m 40s
> read_all.c:568: TINFO: Worker timeout set to 10% of max_runtime: 1000ms
> [ 1344.664349] block sda: the capability attribute has been deprecated.

I think the oops is unrelated to the line above

> [ 1344.679885] BUG: kernel NULL pointer dereference, address: 0000000000000000
> [ 1344.686839] #PF: supervisor instruction fetch in kernel mode
> [ 1344.692490] #PF: error_code(0x0010) - not-present page
> [ 1344.697620] PGD 8000000105569067 P4D 8000000105569067 PUD 1056ed067 PMD 0
> [ 1344.704494] Oops: 0010 [#1] PREEMPT SMP PTI
> [ 1344.708680] CPU: 0 PID: 5649 Comm: read_all Not tainted
> 6.4.0-rc7-next-20230621 #1
> [ 1344.716245] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.5 11/26/2020
> [ 1344.723629] RIP: 0010:0x0
> [ 1344.726257] Code: Unable to access opcode bytes at 0xffffffffffffffd6.
> [ 1344.732780] RSP: 0018:ffff98d38123bd38 EFLAGS: 00010286
> [ 1344.737998] RAX: 0000000000000000 RBX: ffffffffbea38720 RCX: 0000000000000000
> [ 1344.745123] RDX: ffff979e42e31000 RSI: ffffffffbea38720 RDI: ffff979e40371900
> [ 1344.752246] RBP: ffff98d38123bd48 R08: ffff979e4080a0f0 R09: 0000000000000001
> [ 1344.759371] R10: ffff979e42e31000 R11: 0000000000000000 R12: ffff979e42e31000
> [ 1344.766495] R13: 0000000000000001 R14: ffff979e432dd2f8 R15: ffff979e432dd2d0
> [ 1344.773621] FS:  00007ff745d4b740(0000) GS:ffff97a1a7a00000(0000)
> knlGS:0000000000000000
> [ 1344.781704] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 1344.787442] CR2: ffffffffffffffd6 CR3: 000000010563c004 CR4: 00000000003706f0
> [ 1344.794587] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 1344.801733] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [ 1344.808857] Call Trace:
> [ 1344.811301]  <TASK>
> [ 1344.813399]  ? show_regs+0x6e/0x80
> [ 1344.816804]  ? __die+0x29/0x70
> [ 1344.819857]  ? page_fault_oops+0x154/0x470
> [ 1344.823957]  ? do_user_addr_fault+0x355/0x6c0
> [ 1344.828314]  ? exc_page_fault+0x6e/0x170
> [ 1344.832239]  ? asm_exc_page_fault+0x2b/0x30
> [ 1344.836420]  max_phase_adjustment_show+0x23/0x50

The function is newly added by commit c3b60ab7a4dff ("ptp: Add 
getmaxphase callback to ptp_clock_info"), adding everyone from
that patch to Cc.

     Arnd