Hi, Today I saw for the first time "BUG: Bad page state in process kswapd0 pfn:d6e840" Trace: BUG: Bad page state in process kswapd0 pfn:d6e840 page: refcount:0 mapcount:0 mapping:000000007512f4f2 index:0x2796c2c7c pfn:0xd6e840 aops:btree_aops ino:1 flags: 0x17ffffe0000008(uptodate|node=0|zone=2|lastcpupid=0x3fffff) page_type: 0xffffffff() raw: 0017ffffe0000008 dead000000000100 dead000000000122 ffff88826d0be4c0 raw: 00000002796c2c7c 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: non-NULL mapping Modules linked in: uvcvideo uvc videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev rndis_host uas cdc_ether usbnet usb_storage mii overlay tun uinput snd_seq_dummy snd_hrtimer rfcomm nf_conntrack_netbios_ns nf_conntrack_broadcast 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 ip_set nf_tables qrtr bnep sunrpc binfmt_misc snd_usb_audio snd_usbmidi_lib snd_ump snd_rawmidi mc amd_atl intel_rapl_msr intel_rapl_common snd_hda_codec_hdmi mt76x2u mt7921e edac_mce_amd snd_hda_intel mt76x2_common mt7921_common snd_intel_dspcfg mt76x02_usb snd_intel_sdw_acpi mt76_usb mt792x_lib snd_hda_codec mt76x02_lib mt76_connac_lib btusb btrtl mt76 snd_hda_core btintel kvm_amd btbcm btmtk snd_hwdep mac80211 snd_seq kvm vfat snd_seq_device bluetooth libarc4 fat irqbypass snd_pcm rapl cfg80211 snd_timer wmi_bmof pcspkr snd i2c_piix4 k10temp rfkill soundcore joydev apple_mfi_fastcharge gpio_amdpt gpio_generic loop nfnetlink zram amdgpu hid_apple crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic amdxcp i2c_algo_bit drm_ttm_helper ttm ghash_clmulni_intel drm_exec gpu_sched drm_suballoc_helper sha512_ssse3 nvme drm_buddy sha256_ssse3 sha1_ssse3 drm_display_helper nvme_core sp5100_tco r8169 ccp cec realtek nvme_auth video wmi ip6_tables ip_tables fuse CPU: 17 PID: 268 Comm: kswapd0 Tainted: G W L ------- --- 6.9.0-0.rc0.20240315gite5eb28f6d1af.8.fc41.x86_64+debug #1 Hardware name: Micro-Star International Co., Ltd. MS-7D73/MPG B650I EDGE WIFI (MS-7D73), BIOS 1.82 01/24/2024 Call Trace: <TASK> dump_stack_lvl+0xce/0xf0 bad_page+0xd4/0x230 ? __pfx_bad_page+0x10/0x10 ? page_bad_reason+0x9d/0x1f0 free_unref_page_prepare+0x80e/0xe00 ? __pfx___mem_cgroup_uncharge_folios+0x10/0x10 ? __pfx_lock_release+0x10/0x10 free_unref_folios+0x26e/0x9c0 ? _raw_spin_unlock_irq+0x28/0x60 move_folios_to_lru+0xc0e/0xe80 ? __pfx_move_folios_to_lru+0x10/0x10 evict_folios+0xe5c/0x1610 ? evict_folios+0x5f3/0x1610 ? __pfx_lock_acquire+0x10/0x10 ? __pfx_evict_folios+0x10/0x10 ? rcu_is_watching+0x15/0xb0 ? rcu_is_watching+0x15/0xb0 ? __pfx_lock_acquire+0x10/0x10 ? __pfx___might_resched+0x10/0x10 ? mem_cgroup_get_nr_swap_pages+0x25/0x120 try_to_shrink_lruvec+0x4d8/0x800 ? rcu_is_watching+0x15/0xb0 ? __pfx_try_to_shrink_lruvec+0x10/0x10 ? lock_release+0x581/0xc60 ? __pfx_lock_release+0x10/0x10 shrink_one+0x37c/0x6f0 shrink_node+0x1d60/0x3080 ? shrink_node+0x1d47/0x3080 ? shrink_node+0x1afa/0x3080 ? __pfx_shrink_node+0x10/0x10 ? pgdat_balanced+0x7b/0x1a0 balance_pgdat+0x88b/0x1480 ? rcu_is_watching+0x15/0xb0 ? __pfx_balance_pgdat+0x10/0x10 ? __switch_to+0x409/0xdd0 ? __switch_to_asm+0x37/0x70 ? __schedule+0x10cd/0x61d0 ? __pfx_debug_object_free+0x10/0x10 ? __try_to_del_timer_sync+0xe5/0x140 ? __pfx_lock_release+0x10/0x10 ? __pfx___might_resched+0x10/0x10 ? set_pgdat_percpu_threshold+0x1c4/0x2f0 ? __pfx_calculate_pressure_threshold+0x10/0x10 kswapd+0x51d/0x910 ? __pfx_kswapd+0x10/0x10 ? __pfx_autoremove_wake_function+0x10/0x10 ? lockdep_hardirqs_on+0x80/0x110 ? __kthread_parkme+0xba/0x1f0 ? __pfx_kswapd+0x10/0x10 kthread+0x2ed/0x3c0 ? _raw_spin_unlock_irq+0x28/0x60 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x31/0x70 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> Quick googling doesn't give a reassuring answer. If it is really a hardware problem then it is unclear what is the culprit here. The memory was checked a year ago by testmem86 and no errors were found. Considering the absolute randomness of the appearance of this bug message, it may be worth ignoring it, but an unpleasant aftertaste remains. Machine spec: https://linux-hardware.org/?probe=24b7696f8a I attached below full kernel log and build config. -- Best Regards, Mike Gavrilov.
<<attachment: dmesg-BUG-Bad-page-state-in-process-kswapd0.zip>>
<<attachment: config-6.9.0-0.rc0.20240315gite5eb28f6d1af.8.fc41.zip>>
