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From: Fengguang Wu <fengguang.wu@intel.com>
To: James Simmons <jsimmons@infradead.org>
Cc: devel@driverdev.osuosl.org,
	Andreas Dilger <andreas.dilger@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, Oleg Drokin <oleg.drokin@intel.com>,
	lkp@01.org, Denis Petrovic <denis.petrovic@edu.ece.fr>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	lustre-devel@lists.lustre.org
Subject: Re: [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050
Date: Wed, 18 Apr 2018 22:13:17 +0800	[thread overview]
Message-ID: <20180418141317.76o6yzrhjjeavmd7@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <alpine.LFD.2.21.1804181456590.5599@casper.infradead.org>

Hi James,

On Wed, Apr 18, 2018 at 02:59:15PM +0100, James Simmons wrote:
>
>> Hello,
>>
>> FYI this happens in mainline kernel 4.17.0-rc1.
>> It looks like a new regression.
>>
>> [    7.587002]  lnet_selftest_init+0x2c4/0x5d9:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:134
>> [    7.587002]  ? lnet_selftest_exit+0x8d/0x8d:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:90
>
>Are you running lnet selftest ?

Perhaps yes -- it's randconfig boot test and the .config does include
CONFIG_LNET_SELFTEST:

        CONFIG_LNET=y
        CONFIG_LNET_MAX_PAYLOAD=1048576
==>     CONFIG_LNET_SELFTEST=y
        CONFIG_LNET_XPRT_IB=y

>Is this a UMP setup?

Yes, .config has:

        # CONFIG_SMP is not set

>The reason I ask is that their is a SMP handling bug in lnet
>selftest. If you look at the mailing list I pushed a SMP patch
>series. Can you try that series and tell me if it works for you.

So it looks your fixup patch is not for this case? Anyway the
reproduce-* script attached in the previous email should be fairly
straightforward to try out for reproducing the bug.

Thanks,
Fengguang
_______________________________________________
devel mailing list
devel@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel

WARNING: multiple messages have this Message-ID (diff)
From: Fengguang Wu <fengguang.wu@intel.com>
To: James Simmons <jsimmons@infradead.org>
Cc: devel@driverdev.osuosl.org,
	Andreas Dilger <andreas.dilger@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-kernel@vger.kernel.org, Oleg Drokin <oleg.drokin@intel.com>,
	lkp@01.org, Denis Petrovic <denis.petrovic@edu.ece.fr>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	lustre-devel@lists.lustre.org
Subject: [lustre-devel] [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050
Date: Wed, 18 Apr 2018 22:13:17 +0800	[thread overview]
Message-ID: <20180418141317.76o6yzrhjjeavmd7@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <alpine.LFD.2.21.1804181456590.5599@casper.infradead.org>

Hi James,

On Wed, Apr 18, 2018 at 02:59:15PM +0100, James Simmons wrote:
>
>> Hello,
>>
>> FYI this happens in mainline kernel 4.17.0-rc1.
>> It looks like a new regression.
>>
>> [    7.587002]  lnet_selftest_init+0x2c4/0x5d9:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:134
>> [    7.587002]  ? lnet_selftest_exit+0x8d/0x8d:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:90
>
>Are you running lnet selftest ?

Perhaps yes -- it's randconfig boot test and the .config does include
CONFIG_LNET_SELFTEST:

        CONFIG_LNET=y
        CONFIG_LNET_MAX_PAYLOAD=1048576
==>     CONFIG_LNET_SELFTEST=y
        CONFIG_LNET_XPRT_IB=y

>Is this a UMP setup?

Yes, .config has:

        # CONFIG_SMP is not set

>The reason I ask is that their is a SMP handling bug in lnet
>selftest. If you look at the mailing list I pushed a SMP patch
>series. Can you try that series and tell me if it works for you.

So it looks your fixup patch is not for this case? Anyway the
reproduce-* script attached in the previous email should be fairly
straightforward to try out for reproducing the bug.

Thanks,
Fengguang

WARNING: multiple messages have this Message-ID (diff)
From: Fengguang Wu <fengguang.wu@intel.com>
To: lkp@lists.01.org
Subject: Re: [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050
Date: Wed, 18 Apr 2018 22:13:17 +0800	[thread overview]
Message-ID: <20180418141317.76o6yzrhjjeavmd7@wfg-t540p.sh.intel.com> (raw)
In-Reply-To: <alpine.LFD.2.21.1804181456590.5599@casper.infradead.org>

[-- Attachment #1: Type: text/plain, Size: 1202 bytes --]

Hi James,

On Wed, Apr 18, 2018 at 02:59:15PM +0100, James Simmons wrote:
>
>> Hello,
>>
>> FYI this happens in mainline kernel 4.17.0-rc1.
>> It looks like a new regression.
>>
>> [    7.587002]  lnet_selftest_init+0x2c4/0x5d9:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:134
>> [    7.587002]  ? lnet_selftest_exit+0x8d/0x8d:
>> 						lnet_selftest_init at drivers/staging/lustre/lnet/selftest/module.c:90
>
>Are you running lnet selftest ?

Perhaps yes -- it's randconfig boot test and the .config does include
CONFIG_LNET_SELFTEST:

        CONFIG_LNET=y
        CONFIG_LNET_MAX_PAYLOAD=1048576
==>     CONFIG_LNET_SELFTEST=y
        CONFIG_LNET_XPRT_IB=y

>Is this a UMP setup?

Yes, .config has:

        # CONFIG_SMP is not set

>The reason I ask is that their is a SMP handling bug in lnet
>selftest. If you look at the mailing list I pushed a SMP patch
>series. Can you try that series and tell me if it works for you.

So it looks your fixup patch is not for this case? Anyway the
reproduce-* script attached in the previous email should be fairly
straightforward to try out for reproducing the bug.

Thanks,
Fengguang

  reply	other threads:[~2018-04-18 14:13 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-18 13:38 [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050 Fengguang Wu
2018-04-18 13:38 ` Fengguang Wu
2018-04-18 13:38 ` [lustre-devel] " Fengguang Wu
2018-04-18 13:40 ` [cfs_trace_lock_tcd] BUG: KASAN: null-ptr-deref in cfs_trace_lock_tcd+0x25/0xeb Fengguang Wu
2018-04-18 13:40   ` Fengguang Wu
2018-04-18 13:40   ` [lustre-devel] " Fengguang Wu
2018-04-18 18:37   ` Linus Torvalds
2018-04-18 18:37     ` Linus Torvalds
2018-04-18 18:37     ` [lustre-devel] " Linus Torvalds
2018-04-18 22:38     ` NeilBrown
2018-04-18 22:38       ` NeilBrown
2018-04-18 22:38       ` [lustre-devel] " NeilBrown
2018-04-19 13:35     ` Andrey Ryabinin
2018-04-19 13:35       ` Andrey Ryabinin
2018-04-19 13:35       ` [lustre-devel] " Andrey Ryabinin
2018-04-19 13:55       ` Andrey Ryabinin
2018-04-19 13:55         ` Andrey Ryabinin
2018-04-19 13:55         ` [lustre-devel] " Andrey Ryabinin
2018-04-18 13:59 ` [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050 James Simmons
2018-04-18 13:59   ` James Simmons
2018-04-18 13:59   ` [lustre-devel] " James Simmons
2018-04-18 14:13   ` Fengguang Wu [this message]
2018-04-18 14:13     ` Fengguang Wu
2018-04-18 14:13     ` [lustre-devel] " Fengguang Wu
2018-04-18 14:15 ` [lnet_res_container_setup] BUG: unable to handle kernel paging request at 08000664 Fengguang Wu
2018-04-18 14:15   ` Fengguang Wu
2018-04-18 14:15   ` [lustre-devel] " Fengguang Wu

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