[Bug 2162722] Re: general protection fault in lru_gen_del_folio during exit_mmap (ThreadPoolForeg)

Two more recurrences on 2026-09-06 on 7.0.0-31-generic (MGLRU still disabled: /sys/kernel/mm/lru_gen/enabled -> 0x0000). **#8 — 2026-09-06 08:53 JST** - Oops: page fault (not-present page) at lru_activate+0x91/0x3e0 - Comm: kworker/15:0 (Workqueue: events mmput_async_fn), UID 0 - Path: mmput_async_fn -> exit_mmap -> folio_mark_accessed -> lru_activate - Same RIP as my 2026-08-23 report (lru_activate) but triggered from async mm teardown, not a read syscall. **#9 — 2026-09-06 08:59 JST** (kdump reboot ~6 min after #8) - Oops: general protection fault at __page_cache_release.part.0+0xac/0x240 - Comm: V8Worker (PID 8551, UID 1000) — Cursor/Electron V8 worker - Path: do_madvise -> __page_cache_release -> folios_put_refs - Same class as 2026-08-30 (Comm: cursor, madvise path). Hardware unchanged: ASUS PRIME Z690M-PLUS D4, 64GB RAM, RTX 5060 Ti, nvidia OE. Not OOM. Full kdump dmesg archived locally; excerpt attached. Recurrence table update: | Date (JST) | Kernel | RIP | Comm | |-------------------|----------|-----------------------------|-----------------| | 2026-09-06 08:53 | 7.0.0-31 | lru_activate | kworker/15:0 | | 2026-09-06 08:59 | 7.0.0-31 | __page_cache_release | V8Worker | Still awaiting 7.0.0-32+ with upstream MGLRU fixes. ** Attachment added: "kdump dmesg excerpt 2026-09-06 (#8 and #9)" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2162722/+attachment/5997821/+files/launchpad_2162722_kdump_dmesg_20260906.txt -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2162722 Title: general protection fault in lru_gen_del_folio during exit_mmap (ThreadPoolForeg) Status in linux package in Ubuntu: New Bug description: DistroRelease: Ubuntu 26.04 LTS (resolute) Package: linux-image-7.0.0-28-generic 7.0.0-28.28 Kernel: Linux 7.0.0-28-generic #28-Ubuntu SMP PREEMPT_DYNAMIC x86_64 Hardware: ASUS PRIME Z690M-PLUS D4, BIOS 3811 GPU: NVIDIA GeForce RTX 5060 Ti (driver 610.43.02, tainted OE) Impact of the bug: The entire system rebooted unexpectedly (kdump). Work in progress was lost. What I expected to happen: The desktop session should remain stable under normal application load. What actually happened: On 2026-08-03 ~17:25 JST, during heavy Electron/Chromium workload (Cursor IDE agent/plan build), the kernel hit an Oops and kdump triggered an automatic reboot. kdump artifacts: /var/crash/202608031725/ (dmesg + vmcore) Apport ticket: cb836c7a-8f1f-11f1-8811-9953c338e1ca Kernel Oops (from kdump dmesg): Oops: general protection fault, probably for non-canonical address 0xffff7127d16b6d48: 0000 [#1] SMP NOPTI CPU: 6 PID: 80704 Comm: ThreadPoolForeg Tainted: G OE (nvidia out-of-tree modules loaded) RIP: lru_gen_del_folio.constprop.0+0x19a/0x380 Call Trace: lru_gen_del_folio __page_cache_release.part.0 folios_put_refs free_pages_and_swap_cache zap_pte_range exit_mmap do_exit get_signal Not OOM: 64 GB RAM, swap unused at time of crash. Correlating load (not proven causal): - GNOME localsearch indexing CIFS/rclone/SSHFS mounts under ~/drive and ~/mnt - CIFS automount retries to unreachable //192.168.1.152/ (return code -113/-4) Host mitigations already applied locally: - localsearch ignored-directories: drive, mnt - Disabled unreachable .152 CIFS fstab automount Regression notes: Similar sudden reboots were rare on Ubuntu 24.04 (6.8 kernel). This is the first kdump on 26.04 / 7.0.0-28-generic on this machine. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-28-generic 7.0.0-28.28 ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12 Uname: Linux 7.0.0-28-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: ytsubame 2780 F.... wireplumber /dev/snd/controlC0: ytsubame 2780 F.... wireplumber /dev/snd/seq: ytsubame 2696 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Mon Aug 3 18:39:40 2026 InstallationDate: Installed on 2026-07-13 (21 days ago) InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) MachineType: ASUS System Product Name PackageArchitecture: amd64 ProcEnviron: LANG=ja_JP.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=dumb XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic root=UUID=9061133c-3778-49ec-85ba-ecb208384534 ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M RfKill: 0: hci0: Bluetooth Soft blocked: no Hard blocked: no SourcePackage: linux Title: general protection fault in lru_gen_del_folio during exit_mmap (ThreadPoolForeg) UpgradeStatus: No upgrade log present (probably fresh install) _MarkForUpload: True dmi.bios.date: 10/22/2025 dmi.bios.release: 38.11 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3811 dmi.board.asset.tag: Default string dmi.board.name: PRIME Z690M-PLUS D4 dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev 1.xx dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3811:bd10/22/2025:br38.11:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEZ690M-PLUSD4:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2162722/+subscriptions