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Tue, 06 Jan 2026 17:10:58 -0800 (PST) Received: from localhost ([2a03:2880:25ff:4e::]) by smtp.gmail.com with ESMTPSA id 956f58d0204a3-6470d80da68sm1500598d50.9.2026.01.06.17.10.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 06 Jan 2026 17:10:58 -0800 (PST) From: Leo Martins To: "Gideon Farrell" Cc: linux-btrfs@vger.kernel.org Subject: Re: refcount_warn_saturate in __btrfs_release_delayed_node for 6.18.2-arch2-1 Date: Tue, 6 Jan 2026 17:10:20 -0800 Message-ID: <20260107011054.2694891-1-loemra.dev@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable On Tue, 06 Jan 2026 22:01:58 +0000 "Gideon Farrell" wrote: > Hi there, >=20 > I recently experienced a type of crash I haven't seen before on this syst= em which seems to originate in __btrfs_release_delayed_node on Kernel 6.18.= 2-arch2-1. Hey, thanks for the report. This looks very similar to a different report that has been fixed in 6.19-rc5. Report: https://lore.kernel.org/oe-lkp/202511262228.6dda231e-lkp@intel.com/ Fix: https://lore.kernel.org/linux-btrfs/7c89417ac3352ce3cb0a6373a1746155c1= e2754d.1765588168.git.loemra.dev@gmail.com/ Please let me know if this fixes your issue. >=20 > Here's the stack trace: >=20 > ``` Are these the first refcount_t: warnings in your dmesg? I would expect an earlier warning that looks like refcount_t: addition on 0; use-after-free. > Jan 06 16:46:07 leviathan kernel: ------------[ cut here ]------------ > Jan 06 16:46:07 leviathan kernel: refcount_t: saturated; leaking memory. > Jan 06 16:46:07 leviathan kernel: WARNING: CPU: 5 PID: 299428 at lib/refc= ount.c:22 refcount_warn_saturate+0x55/0x110 > Jan 06 16:46:07 leviathan kernel: Modules linked in: uinput uas usb_stora= ge rfcomm tun ip6table_nat ip6table_filter ip6_tables iptable_nat iptable_f= ilter ip_tables x_tables cmac algif_hash algif_skcipher af_alg bnep 8021q g= arp mrp stp llc vfat fat amd_atl intel_rapl_msr intel_rapl_common mt7921e s= nd_hda_codec_atihdmi mt7921_common snd_hda_codec_hdmi mt792x_lib snd_hda_in= tel mt76_connac_lib uvcvideo kvm_amd snd_hda_codec mt76 videobuf2_vmalloc s= nd_usb_audio uvc btusb snd_hda_core snd_usbmidi_lib videobuf2_memops kvm bt= mtk asus_nb_wmi snd_ump snd_intel_dspcfg videobuf2_v4l2 btrtl asus_wmi mac8= 0211 snd_rawmidi spd5118 asus_ec_sensors snd_intel_sdw_acpi btbcm videobuf2= _common platform_profile irqbypass snd_hwdep snd_seq_device btintel sp5100_= tco rapl pcspkr videodev snd_pcm sparse_keymap wmi_bmof cfg80211 bluetooth = snd_timer i2c_piix4 igc snd k10temp i2c_smbus soundcore ptp mousedev mc joy= dev rfkill libarc4 pps_core wacom gpio_amdpt gpio_generic mac_hid nft_rejec= t_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_chain_nat nf_nat nf_con= ntrack > Jan 06 16:46:07 leviathan kernel: nf_defrag_ipv6 nf_defrag_ipv4 nf_table= s crypto_user pkcs8_key_parser ntsync nfnetlink dm_crypt encrypted_keys tru= sted asn1_encoder tee dm_mod hid_logitech_hidpp amdgpu amdxcp i2c_algo_bit = drm_ttm_helper ttm drm_exec drm_panel_backlight_quirks gpu_sched drm_suball= oc_helper drm_buddy nvme polyval_clmulni hid_logitech_dj drm_display_helper= ghash_clmulni_intel nvme_core ccp cec aesni_intel video nvme_keyring nvme_= auth hkdf wmi > Jan 06 16:46:07 leviathan kernel: CPU: 5 UID: 0 PID: 299428 Comm: kworker= /u97:4 Tainted: G W 6.18.2-arch2-1 #1 PREEMPT(full) e9d53= cde2ee9d1bdaa4464d2214ad0f22bd43723 > Jan 06 16:46:07 leviathan kernel: Tainted: [W]=3DWARN > Jan 06 16:46:07 leviathan kernel: Hardware name: ASUS System Product Name= /ROG STRIX B650E-I GAMING WIFI, BIOS 3057 10/29/2024 > Jan 06 16:46:07 leviathan kernel: Workqueue: btrfs-delalloc btrfs_work_he= lper > Jan 06 16:46:07 leviathan kernel: RIP: 0010:refcount_warn_saturate+0x55/0= x110 > Jan 06 16:46:07 leviathan kernel: Code: 84 bc 00 00 00 e9 76 ff 56 ff 85 = f6 74 46 80 3d b4 ce ae 01 00 75 ee 48 c7 c7 60 4a 5d 8f c6 05 a4 ce ae 01 = 01 e8 4b 7d 7b ff <0f> 0b e9 4f ff 56 ff 80 3d 8d ce ae 01 00 75 cb 48 c7 c= 7 10 4b 5d > Jan 06 16:46:07 leviathan kernel: RSP: 0018:ffffcff6e1687b90 EFLAGS: 0001= 0246 > Jan 06 16:46:07 leviathan kernel: RAX: 0000000000000000 RBX: ffff8e330174= b110 RCX: 0000000000000027 > Jan 06 16:46:07 leviathan kernel: RDX: ffff8e41de15d008 RSI: 000000000000= 0001 RDI: ffff8e41de15d000 > Jan 06 16:46:07 leviathan kernel: RBP: ffff8e32d3349060 R08: 000000000000= 0000 R09: 00000000ffffdfff > Jan 06 16:46:07 leviathan kernel: R10: ffffffff90bbaa40 R11: ffffcff6e168= 7a28 R12: 0000000000020000 > Jan 06 16:46:07 leviathan kernel: R13: 0000000000000000 R14: ffff8e330174= b228 R15: 0000000000000000 > Jan 06 16:46:07 leviathan kernel: FS: 0000000000000000(0000) GS:ffff8e42= 4d632000(0000) knlGS:0000000000000000 > Jan 06 16:46:07 leviathan kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000= 0080050033 > Jan 06 16:46:07 leviathan kernel: CR2: 000033b723ba6004 CR3: 0000000024a2= 4000 CR4: 0000000000f50ef0 > Jan 06 16:46:07 leviathan kernel: PKRU: 55555554 > Jan 06 16:46:07 leviathan kernel: Call Trace: > Jan 06 16:46:07 leviathan kernel: > Jan 06 16:46:07 leviathan kernel: __btrfs_release_delayed_node.part.0+0x= 2e7/0x310 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: btrfs_delayed_update_inode+0xf5/0x1e0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? btrfs_update_root_times+0x75/0xa0 > Jan 06 16:46:07 leviathan kernel: btrfs_update_inode+0x59/0xc0 > Jan 06 16:46:07 leviathan kernel: __cow_file_range_inline+0x16c/0x3f0 > Jan 06 16:46:07 leviathan kernel: cow_file_range_inline.constprop.0+0xd7= /0x140 > Jan 06 16:46:07 leviathan kernel: compress_file_range+0x3d6/0x5c0 > Jan 06 16:46:07 leviathan kernel: ? __pfx_submit_compressed_extents+0x10= /0x10 > Jan 06 16:46:07 leviathan kernel: btrfs_work_helper+0xe1/0x380 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: process_one_work+0x193/0x350 > Jan 06 16:46:07 leviathan kernel: worker_thread+0x2d7/0x410 > Jan 06 16:46:07 leviathan kernel: ? __pfx_worker_thread+0x10/0x10 > Jan 06 16:46:07 leviathan kernel: kthread+0xfc/0x240 > Jan 06 16:46:07 leviathan kernel: ? __pfx_kthread+0x10/0x10 > Jan 06 16:46:07 leviathan kernel: ? __pfx_kthread+0x10/0x10 > Jan 06 16:46:07 leviathan kernel: ret_from_fork+0x1c2/0x1f0 > Jan 06 16:46:07 leviathan kernel: ? __pfx_kthread+0x10/0x10 > Jan 06 16:46:07 leviathan kernel: ret_from_fork_asm+0x1a/0x30 > Jan 06 16:46:07 leviathan kernel: > Jan 06 16:46:07 leviathan kernel: ---[ end trace 0000000000000000 ]--- > Jan 06 16:46:07 leviathan kernel: ------------[ cut here ]------------ > Jan 06 16:46:07 leviathan kernel: refcount_t: decrement hit 0; leaking me= mory. > Jan 06 16:46:07 leviathan kernel: WARNING: CPU: 5 PID: 327490 at lib/refc= ount.c:31 refcount_warn_saturate+0xff/0x110 > Jan 06 16:46:07 leviathan kernel: Modules linked in: uinput uas usb_stora= ge rfcomm tun ip6table_nat ip6table_filter ip6_tables iptable_nat iptable_f= ilter ip_tables x_tables cmac algif_hash algif_skcipher af_alg bnep 8021q g= arp mrp stp llc vfat fat amd_atl intel_rapl_msr intel_rapl_common mt7921e s= nd_hda_codec_atihdmi mt7921_common snd_hda_codec_hdmi mt792x_lib snd_hda_in= tel mt76_connac_lib uvcvideo kvm_amd snd_hda_codec mt76 videobuf2_vmalloc s= nd_usb_audio uvc btusb snd_hda_core snd_usbmidi_lib videobuf2_memops kvm bt= mtk asus_nb_wmi snd_ump snd_intel_dspcfg videobuf2_v4l2 btrtl asus_wmi mac8= 0211 snd_rawmidi spd5118 asus_ec_sensors snd_intel_sdw_acpi btbcm videobuf2= _common platform_profile irqbypass snd_hwdep snd_seq_device btintel sp5100_= tco rapl pcspkr videodev snd_pcm sparse_keymap wmi_bmof cfg80211 bluetooth = snd_timer i2c_piix4 igc snd k10temp i2c_smbus soundcore ptp mousedev mc joy= dev rfkill libarc4 pps_core wacom gpio_amdpt gpio_generic mac_hid nft_rejec= t_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_chain_nat nf_nat nf_con= ntrack > Jan 06 16:46:07 leviathan kernel: nf_defrag_ipv6 nf_defrag_ipv4 nf_table= s crypto_user pkcs8_key_parser ntsync nfnetlink dm_crypt encrypted_keys tru= sted asn1_encoder tee dm_mod hid_logitech_hidpp amdgpu amdxcp i2c_algo_bit = drm_ttm_helper ttm drm_exec drm_panel_backlight_quirks gpu_sched drm_suball= oc_helper drm_buddy nvme polyval_clmulni hid_logitech_dj drm_display_helper= ghash_clmulni_intel nvme_core ccp cec aesni_intel video nvme_keyring nvme_= auth hkdf wmi > Jan 06 16:46:07 leviathan kernel: CPU: 5 UID: 1000 PID: 327490 Comm: Back= gro~ol #189 Tainted: G W 6.18.2-arch2-1 #1 PREEMPT(full) = e9d53cde2ee9d1bdaa4464d2214ad0f22bd43723 > Jan 06 16:46:07 leviathan kernel: Tainted: [W]=3DWARN > Jan 06 16:46:07 leviathan kernel: Hardware name: ASUS System Product Name= /ROG STRIX B650E-I GAMING WIFI, BIOS 3057 10/29/2024 > Jan 06 16:46:07 leviathan kernel: RIP: 0010:refcount_warn_saturate+0xff/0= x110 > Jan 06 16:46:07 leviathan kernel: Code: 88 4a 5d 8f c6 05 13 ce ae 01 01 = e8 bb 7c 7b ff 0f 0b e9 bf fe 56 ff 48 c7 c7 e0 4a 5d 8f c6 05 f7 cd ae 01 = 01 e8 a1 7c 7b ff <0f> 0b e9 a5 fe 56 ff 66 2e 0f 1f 84 00 00 00 00 00 90 9= 0 90 90 90 > Jan 06 16:46:07 leviathan kernel: RSP: 0018:ffffcff6eed07868 EFLAGS: 0001= 0246 > Jan 06 16:46:07 leviathan kernel: RAX: 0000000000000000 RBX: ffff8e330174= b110 RCX: 0000000000000027 > Jan 06 16:46:07 leviathan kernel: RDX: ffff8e41de15d008 RSI: 000000000000= 0001 RDI: ffff8e41de15d000 > Jan 06 16:46:07 leviathan kernel: RBP: ffff8e32d3349060 R08: 000000000000= 0000 R09: 00000000ffffdfff > Jan 06 16:46:07 leviathan kernel: R10: ffffffff90bbaa40 R11: ffffcff6eed0= 7700 R12: 0000000000000000 > Jan 06 16:46:07 leviathan kernel: R13: ffff8e32d35393f0 R14: ffff8e330174= b228 R15: 0000000000000000 > Jan 06 16:46:07 leviathan kernel: FS: 00007fb4ae5e56c0(0000) GS:ffff8e42= 4d632000(0000) knlGS:00007fa800000000 > Jan 06 16:46:07 leviathan kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 000000= 0080050033 > Jan 06 16:46:07 leviathan kernel: CR2: 00007f87aaf44000 CR3: 000000012615= c000 CR4: 0000000000f50ef0 > Jan 06 16:46:07 leviathan kernel: PKRU: 55555554 > Jan 06 16:46:07 leviathan kernel: Call Trace: > Jan 06 16:46:07 leviathan kernel: > Jan 06 16:46:07 leviathan kernel: __btrfs_release_delayed_node.part.0+0x= 2f6/0x310 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? balance_dirty_pages_ratelimited_flag= s+0x190/0x380 > Jan 06 16:46:07 leviathan kernel: btrfs_commit_inode_delayed_inode+0xda/= 0x120 > Jan 06 16:46:07 leviathan kernel: btrfs_evict_inode+0x286/0x3e0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? xas_load+0xd/0xd0 > Jan 06 16:46:07 leviathan kernel: evict+0x117/0x290 > Jan 06 16:46:07 leviathan kernel: __dentry_kill+0x6b/0x190 > Jan 06 16:46:07 leviathan kernel: dput+0xeb/0x1c0 > Jan 06 16:46:07 leviathan kernel: do_renameat2+0x41e/0x580 > Jan 06 16:46:07 leviathan kernel: __x64_sys_rename+0x7a/0xc0 > Jan 06 16:46:07 leviathan kernel: do_syscall_64+0x81/0x7f0 > Jan 06 16:46:07 leviathan kernel: ? __mark_inode_dirty+0x273/0x350 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? btrfs_block_rsv_release+0x105/0x1f0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? __btrfs_qgroup_free_meta+0x2b/0x160 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? btrfs_inode_rsv_release+0x60/0xf0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? btrfs_drop_folio+0x3c/0x60 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? btrfs_buffered_write+0x527/0x8a0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? vfs_write+0x2e6/0x480 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? xas_load+0xd/0xd0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? xa_load+0x76/0xb0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? refill_obj_stock+0x12e/0x240 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? __memcg_slab_free_hook+0xf4/0x140 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? kmem_cache_free+0x549/0x5d0 > Jan 06 16:46:07 leviathan kernel: ? __x64_sys_close+0x3d/0x80 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? __x64_sys_close+0x3d/0x80 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? do_syscall_64+0x81/0x7f0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: ? switch_fpu_return+0x4e/0xd0 > Jan 06 16:46:07 leviathan kernel: ? srso_alias_return_thunk+0x5/0xfbef5 > Jan 06 16:46:07 leviathan kernel: entry_SYSCALL_64_after_hwframe+0x76/0x= 7e > Jan 06 16:46:07 leviathan kernel: RIP: 0033:0x7fb53e460adb > Jan 06 16:46:07 leviathan kernel: Code: c0 48 8b 5d f8 c9 c3 0f 1f 84 00 = 00 00 00 00 b8 ff ff ff ff eb eb 66 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 = 52 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 8b 15 01 72 1= a 00 f7 d8 > Jan 06 16:46:07 leviathan kernel: RSP: 002b:00007fb4ae5e3d88 EFLAGS: 0000= 0246 ORIG_RAX: 0000000000000052 > Jan 06 16:46:07 leviathan kernel: RAX: ffffffffffffffda RBX: 000000000000= 0055 RCX: 00007fb53e460adb > Jan 06 16:46:07 leviathan kernel: RDX: 0000000000000055 RSI: 00007fb4ae5e= 3d90 RDI: 00007fb4ae5e3f10 > Jan 06 16:46:07 leviathan kernel: RBP: 00007fb4ae5e4100 R08: 808080808080= 8080 R09: 0101010101010100 > Jan 06 16:46:07 leviathan kernel: R10: fffefffffefffcff R11: 000000000000= 0246 R12: 00007fb4ae5e3d90 > Jan 06 16:46:07 leviathan kernel: R13: 0000000000000054 R14: 00007fb47174= 0790 R15: 00007fb4ae5e3f10 > Jan 06 16:46:07 leviathan kernel: > Jan 06 16:46:07 leviathan kernel: ---[ end trace 0000000000000000 ]--- > ``` >=20 > ~gtf >=20