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[199.203.229.89]) by smtp.gmail.com with ESMTPSA id u4-20020a5d4344000000b002c3f03d8851sm2434422wrr.16.2023.02.19.11.10.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Feb 2023 11:10:04 -0800 (PST) Message-ID: <4d0982f52126f653feee5c2b3131dbab57e28785.camel@scylladb.com> Subject: Re: BUG: kernel NULL pointer dereference, address: 0000000000000042 From: Avi Kivity To: Matthew Wilcox , Dave Chinner Cc: linux-xfs@vger.kernel.org, linux-mm@kvack.org Date: Sun, 19 Feb 2023 21:10:11 +0200 In-Reply-To: References: <412ef57499e8ad13c815516f11cd00479a35587a.camel@scylladb.com> <20230209213002.GF360264@dread.disaster.area> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.46.4 (3.46.4-1.fc37) MIME-Version: 1.0 X-CLOUD-SEC-AV-Sent: true X-CLOUD-SEC-AV-Info: scylladb,google_mail,monitor X-Gm-Spam: 0 X-Gm-Phishy: 0 X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 03E1310000D X-Stat-Signature: npa1ph8u6jmrqwxk3qtqxhpnx4oxbz7g X-HE-Tag: 1676833806-652907 X-HE-Meta: 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 Ur+WNH4k 8/duOdwBzC2MhF5mC5LTC3Z/GCgahjZCEAUhIUAU1swuOwYGyHOgKUDPjm9bZ87BgkP0oSyI0r4Tly9chdzpVPq7AYQCLGTW8wBqAWMPkEjKF7WcDThWqRxl7NghD2IvSQ5//vfP3l5t6VAshj96BfBOfxbFPVcbemjT4acmQfiOAibwRz351wBNUD4tTfxVyC6cEwXgZTe3Vcx9hzyyhox8lqN6f580onvdxYaXy8V8NwYaGPpSSISyiOLQJ0YuZsxuUYiigCfsZX1YOYufxD103vjhnOwTRYvsL/KbWdXuHNezbHO9tQWCrQ9Opup13iez3minrJHgqooqPS+wcZN6b1J+MCSL/k7PooMJzHYaw4By+Vly27Pw8WQ== 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: (resending as text so it doesn't get rejected as spam by the list; since I responded on Feb 12 we've seen it happen one more time) On Thu, 2023-02-09 at 21:50 +0000, Matthew Wilcox wrote: > On Fri, Feb 10, 2023 at 08:30:02AM +1100, Dave Chinner wrote: > > [cc willy, linux-mm, as it crashed walking the page cache in the > > generic fault code] >=20 > I've seen this one occasionally, and I'm not sure what's going on. > I've never been able to reproduce it myself, and it seems to > disappear > for the people who have been able to reproduce it ;-( >=20 > It is 100% my fault and definitely caused by large folios.=C2=A0 In the > XArray, large folios are represented by a folio pointer in the lowest > index occupied by that folio and sibling entries in every other > index, > which redirect lookups to the canonical (ie lowest) entry.=C2=A0 This 0x4= 2 > that you've managed to find in the XArray is a sibling entry.=C2=A0 It > says that the entry we're actually looking for is at offset 0x10 of > the node we're in.=C2=A0=20 >=20 > Something similar was fixed in commit 63b1898fffcd, but that was a > sibling entry that ended up pointing to a node.=C2=A0 You've *presumably* > hit some kind of temporary situation where the original sibling entry > is no > longer pointing to the folio entry that it should be.=C2=A0 However, > there's > another possibility, which is that this is not a temporary RCU- > induced > state, but we have corruption in the tree.=C2=A0 If we do have corruption= , > then you'll see an infinite loop instead of a crash. >=20 > If it's a temporary situation, this will fix it. >=20 I'm unfortunately not in a position to test a fix.=C2=A0 > diff --git a/lib/xarray.c b/lib/xarray.c > index ea9ce1f0b386..4237a9647a6a 100644 > --- a/lib/xarray.c > +++ b/lib/xarray.c > @@ -207,7 +207,8 @@ static void *xas_descend(struct xa_state *xas, > struct xa_node *node) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (xa_is_sibling(entry))= { > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0offset =3D xa_to_sibling(entry); > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0entry =3D xa_entry(xas->xa, node, offset); > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0if (node->shift && xa_is_node(entry)) > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0if (xa_is_sibling(entry) || > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (node->shift && xa_is_node(entry))) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ent= ry =3D XA_RETRY_ENTRY; > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0} > =C2=A0 > Please do let me know ... you say it's happened twice, but how many > machine-hours did it take to hit twice? That's hard to say. There are ~5 machines doing this work, the kernel was installed in early February, so around 1000 machine-hours, but what part of the time they were busy and how much of that they were running the triggering workload, I can't say. >=20 > > On Thu, Feb 09, 2023 at 10:43:10AM +0200, Avi Kivity wrote: > > > Workload: compilation and running unit tests. The task that > > > crashed is > > > a unit test. > > >=20 > > > Kernel: 6.1.8-200.fc37.x86_64 > > >=20 > > > Previously known stable on 5.8.9-200.fc32.x86_64. Two crashes > > > seen so > > > far. > > >=20 > > >=20 > > > Feb=C2=A0 7 17:19:33 localhost kernel: BUG: kernel NULL pointer > > > dereference, > > > address: 0000000000000042 > > > Feb=C2=A0 7 17:19:33 localhost kernel: #PF: supervisor read access in > > > kernel > > > mode > > > Feb=C2=A0 7 17:19:33 localhost kernel: #PF: error_code(0x0000) - not- > > > present > > > page > > > Feb=C2=A0 7 17:19:33 localhost kernel: PGD 80000001cbb1f067 P4D > > > 80000001cbb1f067 PUD 9cbb75067 PMD 0=20 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Oops: 0000 [#1] PREEMPT SMP PT= I > > > Feb=C2=A0 7 17:19:33 localhost kernel: CPU: 24 PID: 3718328 Comm: > > > transport_test Tainted: G S=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 6.1.8-200.fc37.x86_6= 4 > > > #1 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Hardware name: Dell Inc. > > > PowerEdge > > > R730/0599V5, BIOS 2.9.1 12/04/2018 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RIP: > > > 0010:next_uptodate_page+0x46/0x200 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Code: 0f 84 3f 01 00 00 48 81 > > > ff 06 > > > 04 00 00 0f 84 b3 00 00 00 48 81 ff 02 04 00 00 0f 84 37 01 00 00 > > > 40 f6 > > > c7 01 0f 85 9c 00 00 00 <48> 8b 07 a8 01 0f 85 91 00 00 00 8b 47 > > > 34 85 > > > c0 0f 84 86 00 00 00 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RSP: 0000:ffffa83e4ed67cc8 > > > EFLAGS: > > > 00010246 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RAX: 0000000000000042 RBX: > > > ffffa83e4ed67e00 RCX: 000000000000146e > > > Feb=C2=A0 7 17:19:33 localhost kernel: RDX: ffffa83e4ed67d20 RSI: > > > ffff94a9046316b0 RDI: 0000000000000042 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RBP: ffffa83e4ed67d20 R08: > > > 000000000000146e R09: 0000000000dfd000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R10: 000000000000145f R11: > > > ffff94978b85960c R12: ffff94a9046316b0 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R13: 000000000000146e R14: > > > ffff94a9046316b0 R15: ffff948f8bb1f000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: FS:=C2=A0 00007fd68fcb9d40(000= 0) > > > GS:ffff949dffd00000(0000) knlGS:0000000000000000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: CS:=C2=A0 0010 DS: 0000 ES: 00= 00 > > > CR0: > > > 0000000080050033 > > > Feb=C2=A0 7 17:19:33 localhost kernel: CR2: 0000000000000042 CR3: > > > 00000001dc1be005 CR4: 00000000001706e0 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Call Trace: > > > Feb=C2=A0 7 17:19:33 localhost kernel: > > > Feb=C2=A0 7 17:19:33 localhost kernel: filemap_map_pages+0x9f/0x7b0 > > > Feb=C2=A0 7 17:19:33 localhost kernel: xfs_filemap_map_pages+0x41/0x6= 0 > > > [xfs] > > > Feb=C2=A0 7 17:19:33 localhost kernel: do_fault+0x1bf/0x430 > > > Feb=C2=A0 7 17:19:33 localhost kernel: __handle_mm_fault+0x63d/0xe40 > > > Feb=C2=A0 7 17:19:33 localhost kernel: ? do_sigaction+0x11a/0x240 > > > Feb=C2=A0 7 17:19:33 localhost kernel: handle_mm_fault+0xdb/0x2d0 > > > Feb=C2=A0 7 17:19:33 localhost kernel: do_user_addr_fault+0x1cd/0x690 > > > Feb=C2=A0 7 17:19:33 localhost kernel: exc_page_fault+0x70/0x170 > > > Feb=C2=A0 7 17:19:33 localhost kernel: asm_exc_page_fault+0x22/0x30 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RIP: 0033:0x1666350 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Code: Unable to access opcode > > > bytes > > > at 0x1666326. > > > Feb=C2=A0 7 17:19:33 localhost kernel: RSP: 002b:00007ffde7fa86d8 > > > EFLAGS: > > > 00010212 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RAX: 0000000000000000 RBX: > > > 00007ffde7fa8748 RCX: 0000000002ed4468 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RDX: 00006000000c4f50 RSI: > > > 00007ffde7fa8748 RDI: 0000000000000012 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RBP: 0000000000000012 R08: > > > 0000000000000001 R09: 0000000002f46860 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R10: 00007fd69219cac0 R11: > > > 00007fd69224e670 R12: 0000000000000000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R13: 00006000000c4f50 R14: > > > 0000000002ed4470 R15: 00007fd693be0000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: > > > Feb=C2=A0 7 17:19:33 localhost kernel: Modules linked in: xsk_diag > > > veth tls > > > xt_conntrack xt_MASQUERADE nf_conntrack_netlink xt_addrtype > > > nft_compat > > > br_netfilter bridge stp llc intel_rapl_msr dell_wmi iTCO_wdt > > > dell_smbios intel_pmc_bxt iTCO_vendor_support dell_wmi_descriptor > > > ledtrig_audio sparse_keymap video dcdbas intel_rapl_common > > > sb_edac > > > x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm > > > ipmi_ssif > > > irqbypass rapl intel_cstate intel_uncore ipmi_si ipmi_devintf > > > ipmi_msghandler nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib > > > nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct > > > nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 > > > rfkill > > > overlay ip_set nf_tables nfnetlink qrtr acpi_power_meter mxm_wmi > > > mei_me > > > mei lpc_ich auth_rpcgss ip6_tables ip_tables sunrpc zram xfs > > > crct10dif_pclmul crc32_pclmul nvme crc32c_intel polyval_clmulni > > > polyval_generic ixgbe ghash_clmulni_intel nvme_core sha512_ssse3 > > > megaraid_sas tg3 mgag200 mdio nvme_common dca wmi scsi_dh_rdac > > > scsi_dh_emc scsi_dh_alua > > > Feb=C2=A0 7 17:19:33 localhost kernel: dm_multipath fuse > > > Feb=C2=A0 7 17:19:33 localhost kernel: CR2: 0000000000000042 > > > Feb=C2=A0 7 17:19:33 localhost kernel: ---[ end trace 000000000000000= 0 > > > ]--- > > > Feb=C2=A0 7 17:19:33 localhost kernel: RIP: > > > 0010:next_uptodate_page+0x46/0x200 > > > Feb=C2=A0 7 17:19:33 localhost kernel: Code: 0f 84 3f 01 00 00 48 81 > > > ff 06 > > > 04 00 00 0f 84 b3 00 00 00 48 81 ff 02 04 00 00 0f 84 37 01 00 00 > > > 40 f6 > > > c7 01 0f 85 9c 00 00 00 <48> 8b 07 a8 01 0f 85 91 00 00 00 8b 47 > > > 34 85 > > > c0 0f 84 86 00 00 00 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RSP: 0000:ffffa83e4ed67cc8 > > > EFLAGS: > > > 00010246 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RAX: 0000000000000042 RBX: > > > ffffa83e4ed67e00 RCX: 000000000000146e > > > Feb=C2=A0 7 17:19:33 localhost kernel: RDX: ffffa83e4ed67d20 RSI: > > > ffff94a9046316b0 RDI: 0000000000000042 > > > Feb=C2=A0 7 17:19:33 localhost kernel: RBP: ffffa83e4ed67d20 R08: > > > 000000000000146e R09: 0000000000dfd000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R10: 000000000000145f R11: > > > ffff94978b85960c R12: ffff94a9046316b0 > > > Feb=C2=A0 7 17:19:33 localhost kernel: R13: 000000000000146e R14: > > > ffff94a9046316b0 R15: ffff948f8bb1f000 > > > Feb=C2=A0 7 17:19:33 localhost kernel: FS:=C2=A0 00007fd68fcb9d40(000= 0) > > > GS:ffff949dffd00000(0000) knlGS:0000000000000000 > > >=20 > >=20