Re: [Bug 206697] #PF: supervisor read access in kernel mode, #PF: error_code(0x0000) - not-present page while building a large project

[Andrew Morton <akpm@linux-foundation.org>]

On Mon, 2 Mar 2020 15:03:29 -0800 Andrew Morton <akpm@linux-foundation.org> wrote:

> 
> (switched to email.  Please respond via emailed reply-to-all, not via the
> bugzilla web interface).
> 
> On Mon, 02 Mar 2020 21:55:10 +0000 bugzilla-daemon@bugzilla.kernel.org wrote:
> 
> > https://bugzilla.kernel.org/show_bug.cgi?id=206697
> > 
> > --- Comment #2 from Erhard F. (erhard_f@mailbox.org) ---
> > Created attachment 287765
> >   --> https://bugzilla.kernel.org/attachment.cgi?id=287765&action=edit
> > dmesg (kernel 5.6-rc4, Shuttle XPC FS51, Pentium 4)
> > 
> > Same on kernel 5.6-rc4:
> 
> Thanks.  This looks like a regression in the DRM code.  I've added
> suitable Ccs.

Erhard, please let's handle this issue via email, not via the bugzilla
interface.

This does appear to be a DRM issue, and it has been reproduced in
5.7-rc1.

Latest update below:

From: bugzilla-daemon@bugzilla.kernel.org
To: akpm@linux-foundation.org
Subject: [Bug 206697] #PF: supervisor read access in kernel mode, #PF: error_code(0x0000) - not-present page while building a large project
Date: Fri, 17 Apr 2020 07:45:23 +0000

https://bugzilla.kernel.org/show_bug.cgi?id=206697

--- Comment #5 from Erhard F. (erhard_f@mailbox.org) ---
Looks mostly the same on kernel 5.7-rc1. The line after kthread+0xd1/0xd3 is
different. It was "? try_to_free_pages+0x3d4/0x3d4" on 5.5.6 and 5.6-rc4, but
is "? shrink_node+0x6f2/0x6f2" on 5.7-rc1 now.

[...]
Apr 17 00:28:40 BUG: kernel NULL pointer dereference, address: 00000000
Apr 17 00:28:40 #PF: supervisor read access in kernel mode
Apr 17 00:28:40 #PF: error_code(0x0000) - not-present page
Apr 17 00:28:40 *pde = 00000000 
Apr 17 00:28:40 Oops: 0000 [#1] SMP
Apr 17 00:28:40 CPU: 0 PID: 53 Comm: kswapd0 Not tainted 5.7.0-rc1-Pentium4 #1
Apr 17 00:28:40 Hardware name:  /FS51, BIOS 6.00 PG 12/02/2003
Apr 17 00:28:40 EIP: __cpa_process_fault+0x205/0x226
Apr 17 00:28:40 Code: 2d 00 00 00 40 39 d0 76 1f 81 fa ff ff ff bf 76 17 c7 47
10 01 00 00 00 81 c3 00 00 00 40 c1 eb 0c 89 5f 18 31 f6 eb 19 8b 07 <ff> 30 53
68 d5 c7 cb d8 e8 cb 68 00 00 0f 0b>
Apr 17 00:28:40 EAX: 00000000 EBX: 00000000 ECX: 00000001 EDX: 00000000
Apr 17 00:28:40 ESI: 00000001 EDI: f5e5bd4c EBP: f5e5bcc4 ESP: f5e5bca0
Apr 17 00:28:40 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010213
Apr 17 00:28:40 CR0: 80050033 CR2: 00000000 CR3: 05ab3000 CR4: 000006d0
Apr 17 00:28:40 Call Trace:
Apr 17 00:28:40  ? _raw_spin_lock+0x22/0x2a
Apr 17 00:28:40  ? lookup_address+0x1d/0x20
Apr 17 00:28:40  __change_page_attr_set_clr+0x85/0x551
Apr 17 00:28:40  ? __mutex_unlock_slowpath+0x20/0x1b6
Apr 17 00:28:40  ? mutex_unlock+0xb/0xd
Apr 17 00:28:40  ? _vm_unmap_aliases.part.0+0x11f/0x127
Apr 17 00:28:40  change_page_attr_set_clr+0xdc/0x1af
Apr 17 00:28:40  set_pages_array_wb+0x20/0x7b
Apr 17 00:28:40  ttm_pages_put+0x22/0x71 [ttm]
Apr 17 00:28:40  ttm_page_pool_free+0xa1/0x111 [ttm]
Apr 17 00:28:40  ttm_pool_shrink_scan+0x9c/0xd1 [ttm]
Apr 17 00:28:40  shrink_slab.constprop.0+0x248/0x38f
Apr 17 00:28:40  shrink_node+0x533/0x6f2
Apr 17 00:28:40  kswapd+0x4b6/0x628
Apr 17 00:28:40  ? kswapd+0x4b6/0x628
Apr 17 00:28:40  kthread+0xd1/0xd3
Apr 17 00:28:40  ? shrink_node+0x6f2/0x6f2
Apr 17 00:28:40  ? kthread_delayed_work_timer_fn+0x6a/0x6a
Apr 17 00:28:40  ret_from_fork+0x2e/0x38
Apr 17 00:28:40 Modules linked in: fuse auth_rpcgss nfsv4 dns_resolver nfs
lockd grace sunrpc rt2500pci eeprom_93cx6 rt2x00pci rt2x00mmio rt2x00lib
led_class mac80211 radeon hwmon i2c_algo_bit d>
Apr 17 00:28:40 CR2: 0000000000000000
Apr 17 00:28:40 ---[ end trace 49fbdfbb6e459a06 ]---
Apr 17 00:28:40 EIP: __cpa_process_fault+0x205/0x226
Apr 17 00:28:40 Code: 2d 00 00 00 40 39 d0 76 1f 81 fa ff ff ff bf 76 17 c7 47
10 01 00 00 00 81 c3 00 00 00 40 c1 eb 0c 89 5f 18 31 f6 eb 19 8b 07 <ff> 30 53
68 d5 c7 cb d8 e8 cb 68 00 00 0f 0b>
Apr 17 00:28:40 EAX: 00000000 EBX: 00000000 ECX: 00000001 EDX: 00000000
Apr 17 00:28:40 ESI: 00000001 EDI: f5e5bd4c EBP: f5e5bcc4 ESP: f5e5bca0
Apr 17 00:28:40 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 EFLAGS: 00010213
Apr 17 00:28:40 CR0: 80050033 CR2: 00000000 CR3: 05ab3000 CR4: 000006d0

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