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Thu, 05 Feb 2026 04:46:34 -0800 (PST) MIME-Version: 1.0 References: <5948f3a6-8f30-4c45-9b86-2af9a6b37405@kernel.org> In-Reply-To: From: Tytus Rogalewski Date: Thu, 5 Feb 2026 13:46:23 +0100 X-Gm-Features: AZwV_QgbjbYRFk2XSFb3xiYvCW8oZG7O1T35pSwFfqEZ6Pf5SqEiNCpVdIaCHyY Message-ID: Subject: Re: walk_pgd_range BUG: unable to handle page fault To: "David Hildenbrand (Arm)" Cc: linux-mm@kvack.org, muchun.song@linux.dev, osalvador@suse.de Content-Type: multipart/alternative; boundary="00000000000014eb20064a1310da" X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 2F2E51C0008 X-Stat-Signature: pyx355bgp74jhfsy6p4ppj49p5kzdn5n X-Rspam-User: X-HE-Tag: 1770295596-888199 X-HE-Meta: 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 nl4LxHa5 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --00000000000014eb20064a1310da Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hehe, i cant. I dont have any CPU only servers :) Should 2MB and 1GB one act the same ? -- tel. 790 202 300 *Tytus Rogalewski* Dolina Krzemowa 6A 83-010 Jagatowo NIP: 9570976234 czw., 5 lut 2026 o 13:44 David Hildenbrand (Arm) napisa=C5=82(a): > On 2/4/26 23:50, Tytus Rogalewski wrote: > > Just had another crash and it is still happening in 6.18.8 . Here is > > claude output this time as i am lazy :) > > I'm lazy and ignore AI slop. :) > > [...] > > > > > Feb 04 21:42:16 pve12 kernel: BUG: unable to handle page fault for > > address: ff164aee00000000 > > Feb 04 21:42:16 pve12 kernel: #PF: supervisor read access in kernel > mode > > Feb 04 21:42:16 pve12 kernel: #PF: error_code(0x0000) - not-present > page > > Feb 04 21:42:16 pve12 kernel: PGD 4602067 P4D 0 > > Feb 04 21:42:16 pve12 kernel: Oops: Oops: 0000 [#1] SMP NOPTI > > Feb 04 21:42:16 pve12 kernel: CPU: 125 UID: 0 PID: 783442 Comm: qm > > Not tainted 6.18.8-pbk #1 PREEMPT(voluntary) > > Feb 04 21:42:16 pve12 kernel: Hardware name: TURIN2D24G-2L+/500W/ > > TURIN2D24G-2L+/500W, BIOS 10.12 11/14/2024 > > Feb 04 21:42:16 pve12 kernel: RIP: 0010:walk_pgd_range+0x6ff/0xbb0 > > Feb 04 21:42:16 pve12 kernel: Code: 08 49 39 dd 0f 84 8c 01 00 00 49 > > 89 de 49 8d 9e 00 00 20 00 48 8b 75 b8 48 81 e3 00 00 e0 ff 48 8d 43 ff > > 48 39 f0 49 0f 43 dd <49> f7 04 24 9f ff ff ff 0f 84 e2 fd ff ff 48 8b > > 45 c0 41 c7 47 20 > > Feb 04 21:42:16 pve12 kernel: RSP: 0018:ff643a4c403439a8 EFLAGS: > 00010287 > > Feb 04 21:42:16 pve12 kernel: RAX: 000071afc01fffff RBX: > > 000071afc0200000 RCX: 0000000000000000 > > Feb 04 21:42:16 pve12 kernel: RDX: 0000000000000000 RSI: > > 000071afffffffff RDI: 80002fd0000002b7 > > Feb 04 21:42:16 pve12 kernel: RBP: ff643a4c40343a88 R08: > > 0000000000000080 R09: 0000000000000000 > > Feb 04 21:42:16 pve12 kernel: R10: ffffffffb84588c0 R11: > > 0000000000000000 R12: ff164aee00000000 > > Feb 04 21:42:16 pve12 kernel: R13: 000071b000000000 R14: > > 000071afc0000000 R15: ff643a4c40343b08 > > Feb 04 21:42:16 pve12 kernel: FS: 0000767454f93b80(0000) > > GS:ff161c21bdefe000(0000) knlGS:0000000000000000 > > Feb 04 21:42:16 pve12 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: > > 0000000080050033 > > Feb 04 21:42:16 pve12 kernel: CR2: ff164aee00000000 CR3: > > 00000080dff18005 CR4: 0000000000f71ef0 > > Feb 04 21:42:16 pve12 kernel: PKRU: 55555554 > > Feb 04 21:42:16 pve12 kernel: Call Trace: > > Feb 04 21:42:16 pve12 kernel: > > Feb 04 21:42:16 pve12 kernel: __walk_page_range+0x8e/0x220 > > Feb 04 21:42:16 pve12 kernel: walk_page_vma+0x92/0xe0 > > Feb 04 21:42:16 pve12 kernel: smap_gather_stats.part.0+0x8c/0xd0 > > Feb 04 21:42:16 pve12 kernel: show_smaps_rollup+0x258/0x420 > > Feb 04 21:42:16 pve12 kernel: seq_read_iter+0x137/0x4c0 > > Feb 04 21:42:16 pve12 kernel: seq_read+0xf5/0x140 > > Feb 04 21:42:16 pve12 kernel: vfs_read+0xbb/0x350 > > Feb 04 21:42:16 pve12 kernel: ksys_read+0x69/0xf0 > > Feb 04 21:42:16 pve12 kernel: __x64_sys_read+0x19/0x30 > > Feb 04 21:42:16 pve12 kernel: x64_sys_call+0x2180/0x25a0 > > Feb 04 21:42:16 pve12 kernel: do_syscall_64+0x80/0xce0 > > Feb 04 21:42:16 pve12 kernel: > entry_SYSCALL_64_after_hwframe+0x76/0x7e > > Feb 04 21:42:16 pve12 kernel: > > Feb 04 21:42:16 pve12 kernel: Modules linked in: sctp ip6_udp_tunnel > > > Yeah, same thing again. > > Can you retry without vfio passthrough to see whether it's triggered by > that? > > vfio recently gained support for installing huge mappings into user page > tables. I wonder whether it is related to that. > > -- > Cheers, > > David > --00000000000014eb20064a1310da Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hehe, i cant. I dont have any CPU only servers :)
=

Should 2MB and 1GB one act the same ?


--

tel. 790 202 300

Tytus Rogalewski

Dolina Krzemowa 6A<= /font>

83-010 Jagatowo

NIP: 9570976234



czw., 5 lut 2026 o 13= :44=C2=A0David Hildenbrand (Arm) <da= vid@kernel.org> napisa=C5=82(a):
On 2/4/26 23:50, Tytus Rogalewski wrote:
> Just had another crash and it is still happening in 6.18.8=C2=A0. Here= is
> claude output this time as i am lazy :)

I'm lazy and ignore AI slop. :)

[...]

>
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: BUG: unable to handle page = fault for
> address: ff164aee00000000
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: #PF: supervisor read access= in kernel mode
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: #PF: error_code(0x0000) - n= ot-present page
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: PGD 4602067 P4D 0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: Oops: Oops: 0000 [#1] SMP N= OPTI
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: CPU: 125 UID: 0 PID: 783442= Comm: qm
> Not tainted 6.18.8-pbk #1 PREEMPT(voluntary)
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: Hardware name: =C2=A0TURIN2= D24G-2L+/500W/
> TURIN2D24G-2L+/500W, BIOS 10.12 11/14/2024
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: RIP: 0010:walk_pgd_range+0x= 6ff/0xbb0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: Code: 08 49 39 dd 0f 84 8c = 01 00 00 49
> 89 de 49 8d 9e 00 00 20 00 48 8b 75 b8 48 81 e3 00 00 e0 ff 48 8d 43 f= f
> 48 39 f0 49 0f 43 dd <49> f7 04 24 9f ff ff ff 0f 84 e2 fd ff ff= 48 8b
> 45 c0 41 c7 47 20
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: RSP: 0018:ff643a4c403439a8 = EFLAGS: 00010287
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: RAX: 000071afc01fffff RBX: =
> 000071afc0200000 RCX: 0000000000000000
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: RDX: 0000000000000000 RSI: =
> 000071afffffffff RDI: 80002fd0000002b7
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: RBP: ff643a4c40343a88 R08: =
> 0000000000000080 R09: 0000000000000000
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: R10: ffffffffb84588c0 R11: =
> 0000000000000000 R12: ff164aee00000000
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: R13: 000071b000000000 R14: =
> 000071afc0000000 R15: ff643a4c40343b08
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: FS: =C2=A00000767454f93b80(= 0000)
> GS:ff161c21bdefe000(0000) knlGS:0000000000000000
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: CS: =C2=A00010 DS: 0000 ES:= 0000 CR0:
> 0000000080050033
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: CR2: ff164aee00000000 CR3: =
> 00000080dff18005 CR4: 0000000000f71ef0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: PKRU: 55555554
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: Call Trace:
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0<TASK>
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0__walk_page_range+0x8= e/0x220
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0walk_page_vma+0x92/0x= e0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0smap_gather_stats.par= t.0+0x8c/0xd0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0show_smaps_rollup+0x2= 58/0x420
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0seq_read_iter+0x137/0= x4c0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0seq_read+0xf5/0x140 >=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0vfs_read+0xbb/0x350 >=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0ksys_read+0x69/0xf0 >=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0__x64_sys_read+0x19/0= x30
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0x64_sys_call+0x2180/0= x25a0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0do_syscall_64+0x80/0x= ce0
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0entry_SYSCALL_64_afte= r_hwframe+0x76/0x7e
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: =C2=A0</TASK>
>=C2=A0 =C2=A0 Feb 04 21:42:16 pve12 kernel: Modules linked in: sctp ip6= _udp_tunnel


Yeah, same thing again.

Can you retry without vfio passthrough to see whether it's triggered by=
that?

vfio recently gained support for installing huge mappings into user page tables. I wonder whether it is related to that.

--
Cheers,

David
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