linux-kernel - Re: test_kmod: BUG on module removal

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Message-ID: <20181124050641.GG4922@garbanzo.do-not-panic.com>
Date:   Fri, 23 Nov 2018 21:06:41 -0800
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: test_kmod: BUG on module removal

On Sat, Oct 13, 2018 at 10:59:46AM -0700, Randy Dunlap wrote:
> 4.19-rc7, on x86_64:
> 
> modprobe test_kmod; rmmod test_kmod
> 
> [  199.033143] calling  test_kmod_init+0x0/0x1000 [test_kmod] @ 1704
> [  199.034636] misc test_kmod0: interface ready
> [  199.035468] initcall test_kmod_init+0x0/0x1000 [test_kmod] returned 0 after 1210 usecs
> [  206.597737] misc test_kmod0: Ending request_module() tests
> [  206.598698] misc test_kmod0: removing interface
> [  206.600052] BUG: unable to handle kernel paging request at ffffe150a6032048
> [  206.601224] PGD 0 P4D 0 
> [  206.601642] Oops: 0000 [#1] PREEMPT SMP PTI
> [  206.602309] CPU: 3 PID: 1707 Comm: rmmod Not tainted 4.19.0-rc7mod #2
> [  206.603479] Hardware name: TOSHIBA PORTEGE R835/Portable PC, BIOS Version 4.10   01/08/2013
> [  206.604899] RIP: 0010:kfree+0x43/0x180

Thanks, I've fixed this, and sent a patch.

  Luis