linux-kernel - Re: [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer dereference at 00000050

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Date:   Wed, 18 Apr 2018 14:59:15 +0100 (BST)
From:   James Simmons <jsimmons@...radead.org>
To:     Fengguang Wu <fengguang.wu@...el.com>
cc:     Oleg Drokin <oleg.drokin@...el.com>,
        Andreas Dilger <andreas.dilger@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Denis Petrovic <denis.petrovic@....ece.fr>,
        lustre-devel@...ts.lustre.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: Re: [cfs_trace_lock_tcd] BUG: unable to handle kernel NULL pointer
 dereference at 00000050


> 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 ? Is this a UMP setup? 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. Thanks