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Date:   Sun, 21 Jun 2020 13:05:27 -0700 (PDT)
From:   David Rientjes <rientjes@google.com>
To:     Roman Gushchin <guro@fb.com>, Takashi Iwai <tiwai@suse.de>
cc:     Andrea Arcangeli <aarcange@redhat.com>,
        Yang Shi <shy828301@gmail.com>,
        iommu@lists.linux-foundation.org, Joerg Roedel <joro@8bytes.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux MM <linux-mm@kvack.org>,
        Michal Hocko <mhocko@kernel.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Wei Yang <richardw.yang@linux.intel.com>
Subject: Re: kernel BUG at mm/huge_memory.c:2613!
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On Fri, 19 Jun 2020, Roman Gushchin wrote:

> > > [   40.287524] BUG: unable to handle page fault for address: ffffa77b833df000
> > > [   40.287529] #PF: supervisor write access in kernel mode
> > > [   40.287531] #PF: error_code(0x000b) - reserved bit violation
> > > [   40.287532] PGD 40d14e067 P4D 40d14e067 PUD 40d14f067 PMD 3ec54d067
> > > PTE 80001688033d9163
> > > [   40.287538] Oops: 000b [#2] SMP NOPTI
> > > [   40.287542] CPU: 9 PID: 1986 Comm: pulseaudio Tainted: G      D
> > >       5.8.0-rc1+ #697
> > > [   40.287544] Hardware name: Gigabyte Technology Co., Ltd.
> > > AB350-Gaming/AB350-Gaming-CF, BIOS F25 01/16/2019
> > > [   40.287550] RIP: 0010:__memset+0x24/0x30
> > > [   40.287553] Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89
> > > d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48
> > > 0f af c6 <f3> 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89
> > > d1 f3
> > > [   40.287556] RSP: 0018:ffffa77b827a7e08 EFLAGS: 00010216
> > > [   40.287558] RAX: 0000000000000000 RBX: ffff90f77dced800 RCX: 00000000000008a0
> > > [   40.287560] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffa77b833df000
> > > [   40.287561] RBP: ffff90f7898c7000 R08: ffff90f78c507768 R09: ffffa77b833df000
> > > [   40.287563] R10: ffffa77b833df000 R11: ffff90f7839f2d40 R12: 0000000000000000
> > > [   40.287564] R13: ffff90f76a802e00 R14: ffffffffc0cb8880 R15: ffff90f770f4e700
> > > [   40.287567] FS:  00007f3d8e8df880(0000) GS:ffff90f78ee40000(0000)
> > > knlGS:0000000000000000
> > > [   40.287569] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [   40.287570] CR2: ffffa77b833df000 CR3: 00000003fa556000 CR4: 00000000003406e0
> > > [   40.287572] Call Trace:
> > > [   40.287584]  snd_pcm_hw_params+0x3fd/0x490 [snd_pcm]
> > > [   40.287593]  snd_pcm_common_ioctl+0x1c5/0x1110 [snd_pcm]
> > > [   40.287601]  ? snd_pcm_info_user+0x64/0x80 [snd_pcm]
> > > [   40.287608]  snd_pcm_ioctl+0x23/0x30 [snd_pcm]
> > > [   40.287613]  ksys_ioctl+0x82/0xc0
> > > [   40.287617]  __x64_sys_ioctl+0x16/0x20
> > > [   40.287622]  do_syscall_64+0x4d/0x90
> > > [   40.287627]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> > 
> > Hi Roman,
> > 
> > If you have CONFIG_AMD_MEM_ENCRYPT set, this should be resolved by
> > 
> > commit dbed452a078d56bc7f1abecc3edd6a75e8e4484e
> > Author: David Rientjes <rientjes@google.com>
> > Date:   Thu Jun 11 00:25:57 2020 -0700
> > 
> >     dma-pool: decouple DMA_REMAP from DMA_COHERENT_POOL
> > 
> > Or you might want to wait for 5.8-rc2 instead which includes this fix.
> > 
> 
> Hello, David!
> 
> Thank you for pointing at it! Unfortunately, there must be something wrong
> with drivers, your patch didn't help much. I still see the same stacktrace.
> 

Wow, I'm very surprised.  Do you have CONFIG_AMD_MEM_ENCRYPT enabled?

Adding Takashi.