linux-kernel - Re: Regression: NULL pointer dereference after NFS_V4_2_READ

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Message-ID: <a3683dd3-3f30-bb4c-539d-d1519de6e5bf@linaro.org>
Date:   Tue, 14 Feb 2023 12:02:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Anna Schumaker <schumaker.anna@...il.com>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        linux-nfs <linux-nfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: Regression: NULL pointer dereference after NFS_V4_2_READ_PLUS
 (commit 7fd461c47)

On 12/02/2023 15:05, Anna Schumaker wrote:
>>> From ac2d6c501dbcdb306480edaee625b5496f1fb4f5 Mon Sep 17 00:00:00 2001
>>> From: Anna Schumaker <Anna.Schumaker@...app.com>
>>> Date: Fri, 10 Feb 2023 15:50:22 -0500
>>> Subject: [PATCH] NFSv4.2: Rework scratch handling for READ_PLUS
>>>
>>
>> Patch is corrupted - maybe mail program reformatted it when sending:
>>
>> Applying: NFSv4.2: Rework scratch handling for READ_PLUS
>> error: corrupt patch at line 12
>> Patch failed at 0001 NFSv4.2: Rework scratch handling for READ_PLUS
> 
> That's weird. I wasn't expecting gmail to reformat the patch but I
> guess it did. I've added it as an attachment so that shouldn't happen
> again.

Still null ptr (built on 420b2d4 with your patch):

[  144.690844] mmiocpy from xdr_inline_decode (net/sunrpc/xdr.c:1419 net/sunrpc/xdr.c:1454) 
[  144.695950] xdr_inline_decode from nfs4_xdr_dec_read_plus (fs/nfs/nfs42xdr.c:1063 fs/nfs/nfs42xdr.c:1147 fs/nfs/nfs42xdr.c:1360 fs/nfs/nfs42xdr.c:1341) 
[  144.702452] nfs4_xdr_dec_read_plus from call_decode (net/sunrpc/clnt.c:2595) 
[  144.708429] call_decode from __rpc_execute (include/asm-generic/bitops/generic-non-atomic.h:128 net/sunrpc/sched.c:954) 
[  144.713538] __rpc_execute from rpc_async_schedule (include/linux/sched/mm.h:336 net/sunrpc/sched.c:1035) 
[  144.719170] rpc_async_schedule from process_one_work (include/linux/jump_label.h:260 include/linux/jump_label.h:270 include/trace/events/workqueue.h:108 kernel/workqueue.c:2294) 
[  144.725238] process_one_work from worker_thread (include/linux/list.h:292 kernel/workqueue.c:2437) 
[  144.730782] worker_thread from kthread (kernel/kthread.c:378) 
[  144.735547] kthread from ret_from_fork (arch/arm/kernel/entry-common.S:149)



Best regards,
Krzysztof