Hi,

A user in Debian reported the following kernel oops when running on 6.12.41 (but apparently as well on older versions, though there were several netfs related similar issues, so including Max Kellermann as well in the recipients)

The report from Benoit Panizzon is as follows:

From: Benoit Panizzon bp@imp.ch Resent-From: Benoit Panizzon bp@imp.ch Reply-To: Benoit Panizzon bp@imp.ch, 1111455@bugs.debian.org X-Mailer: reportbug 13.2.0 Date: Mon, 18 Aug 2025 10:24:32 +0200 To: Debian Bug Tracking System submit@bugs.debian.org Subject: Bug#1111455: linux-image-6.12.41+deb13-amd64: kernel BUG at fs/netfs/read_collect.c:316 netfs: Can't donate prior to front Delivered-To: lists-debian-kernel@bendel.debian.org Delivered-To: submit@bugs.debian.org Message-ID: 175550547264.3745.5845128440223069497.reportbug@go.imp.ch

Package: src:linux Version: 6.12.41-1 Severity: grave Justification: renders package unusable X-Debbugs-Cc: debian-amd64@lists.debian.org User: debian-amd64@lists.debian.org Usertags: amd64

Dear Maintainer,

Updated my workstation from Bookworm to Trixie. /home on NFS

Applications accessing data on NFS shares become unresponsive one after the other after a couple of minutes.

Especially affected:

• Claws-Mail
• Chromium

Suspected cachefsd being the culpit and disabled - issue persists.

It looks like an invalid opcode is being used. Fairly recent CPU in use:

vendor_id : AuthenticAMD cpu family : 25 model : 80 model name : AMD Ryzen 7 PRO 5750GE with Radeon Graphics stepping : 0 microcode : 0xa500011

Google found reports of others affected with similar kernel versions mostly when accessing SMB shares.

[Mo Aug 18 10:11:19 2025] netfs: Can't donate prior to front [Mo Aug 18 10:11:19 2025] R=00001e07[4] s=6000-7fff 0/2000/2000 [Mo Aug 18 10:11:19 2025] folio: 4000-7fff [Mo Aug 18 10:11:19 2025] donated: prev=0 next=0 [Mo Aug 18 10:11:19 2025] s=6000 av=2000 part=2000 [Mo Aug 18 10:11:19 2025] ------------[ cut here ]------------ [Mo Aug 18 10:11:19 2025] kernel BUG at fs/netfs/read_collect.c:316! [Mo Aug 18 10:11:19 2025] Oops: invalid opcode: 0000 [#1] PREEMPT SMP NOPTI [Mo Aug 18 10:11:19 2025] CPU: 5 UID: 0 PID: 115 Comm: kworker/u64:1 Not tainted 6.12.41+deb13-amd64 #1 Debian 6.12.41-1 [Mo Aug 18 10:11:19 2025] Hardware name: LENOVO 11JN000JGE/32E4, BIOS M47KT26A 11/23/2022 [Mo Aug 18 10:11:19 2025] Workqueue: nfsiod rpc_async_release [sunrpc] [Mo Aug 18 10:11:19 2025] RIP: 0010:netfs_consume_read_data.isra.0+0xb79/0xb80 [netfs] [Mo Aug 18 10:11:19 2025] Code: 48 89 ea 31 f6 48 c7 c7 96 95 6f c2 e8 d0 8d a2 e1 48 8b 4c 24 10 4c 89 fe 48 8b 54 24 20 48 c7 c7 b2 95 6f c2 e8 b7 8d a2 e1 <0f> 0b 90 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 [Mo Aug 18 10:11:19 2025] RSP: 0018:ffffb4234057bd58 EFLAGS: 00010246 [Mo Aug 18 10:11:19 2025] RAX: 0000000000000018 RBX: ffff9aed62651ec0 RCX: 0000000000000027 [Mo Aug 18 10:11:19 2025] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff9af04e4a1740 [Mo Aug 18 10:11:19 2025] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb4234057bbe8 [Mo Aug 18 10:11:19 2025] R10: ffffffffa50b43a8 R11: 0000000000000003 R12: ffff9aed6c9081e8 [Mo Aug 18 10:11:19 2025] R13: 0000000000004000 R14: ffff9aed6c9081e8 R15: 0000000000006000 [Mo Aug 18 10:11:19 2025] FS: 0000000000000000(0000) GS:ffff9af04e480000(0000) knlGS:0000000000000000 [Mo Aug 18 10:11:19 2025] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Mo Aug 18 10:11:19 2025] CR2: 00003d3407849020 CR3: 00000002f1822000 CR4: 0000000000f50ef0 [Mo Aug 18 10:11:19 2025] PKRU: 55555554 [Mo Aug 18 10:11:19 2025] Call Trace: [Mo Aug 18 10:11:19 2025] <TASK> [Mo Aug 18 10:11:19 2025] netfs_read_subreq_terminated+0x2ab/0x3e0 [netfs] [Mo Aug 18 10:11:19 2025] nfs_netfs_read_completion+0x9c/0xc0 [nfs] [Mo Aug 18 10:11:19 2025] nfs_read_completion+0xf6/0x130 [nfs] [Mo Aug 18 10:11:19 2025] rpc_free_task+0x39/0x60 [sunrpc] [Mo Aug 18 10:11:19 2025] rpc_async_release+0x2f/0x40 [sunrpc] [Mo Aug 18 10:11:19 2025] process_one_work+0x177/0x330 [Mo Aug 18 10:11:19 2025] worker_thread+0x251/0x390 [Mo Aug 18 10:11:19 2025] ? __pfx_worker_thread+0x10/0x10 [Mo Aug 18 10:11:19 2025] kthread+0xd2/0x100 [Mo Aug 18 10:11:19 2025] ? __pfx_kthread+0x10/0x10 [Mo Aug 18 10:11:19 2025] ret_from_fork+0x34/0x50 [Mo Aug 18 10:11:19 2025] ? __pfx_kthread+0x10/0x10 [Mo Aug 18 10:11:19 2025] ret_from_fork_asm+0x1a/0x30 [Mo Aug 18 10:11:19 2025] </TASK> [Mo Aug 18 10:11:19 2025] Modules linked in: nfsv3 rpcsec_gss_krb5 nfsv4 dns_resolver nfs netfs nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nft_compat nf_tables libcrc32c wireguard libchacha20poly1305 chacha_x86_64 poly1305_x86_64 curve25519_x86_64 libcurve25519_generic libchacha vxlan ip6_udp_tunnel udp_tunnel bridge stp llc btusb btrtl btintel btbcm btmtk bluetooth joydev qrtr nfsd auth_rpcgss binfmt_misc nfs_acl lockd grace nls_ascii nls_cp437 sunrpc vfat fat amd_atl intel_rapl_msr intel_rapl_common rtw88_8822ce rtw88_8822c edac_mce_amd rtw88_pci snd_sof_amd_rembrandt snd_sof_amd_acp rtw88_core kvm_amd snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_hda_codec_realtek mac80211 kvm snd_hda_codec_generic snd_sof_utils snd_hda_scodec_component snd_soc_core snd_hda_codec_hdmi snd_hda_intel snd_compress snd_intel_dspcfg libarc4 snd_pcm_dmaengine irqbypass snd_intel_sdw_acpi snd_pci_ps crct10dif_pclmul snd_hda_codec ghash_clmulni_intel snd_rpl_pci_acp6x cfg80211 snd_hda_core sha512_ssse3 snd_acp_pci [Mo Aug 18 10:11:19 2025] sha256_ssse3 snd_acp_legacy_common sha1_ssse3 snd_hwdep snd_pci_acp6x aesni_intel snd_pcm gf128mul snd_pci_acp5x crypto_simd think_lmi snd_timer snd_rn_pci_acp3x cryptd firmware_attributes_class snd_acp_config wmi_bmof snd snd_soc_acpi ee1004 rapl snd_pci_acp3x pcspkr ccp k10temp rfkill soundcore evdev parport_pc ppdev lp parport configfs efi_pstore nfnetlink efivarfs ip_tables x_tables autofs4 ext4 mbcache jbd2 crc32c_generic hid_plantronics hid_generic usbhid hid amdgpu dm_mod amdxcp drm_exec gpu_sched drm_buddy i2c_algo_bit drm_suballoc_helper drm_display_helper cec rc_core drm_ttm_helper xhci_pci ttm xhci_hcd drm_kms_helper drm r8169 nvme usbcore realtek sp5100_tco nvme_core mdio_devres watchdog libphy crc32_pclmul i2c_piix4 video crc32c_intel usb_common nvme_auth i2c_smbus crc16 wmi button [Mo Aug 18 10:11:19 2025] ---[ end trace 0000000000000000 ]---

Any ideas here? Benoit can you please es well test the current 6.16.1 ideally to verify if the problem persists there as well?

Regards, Salvatore