linux-kernel - prepare_slab_obj_exts_hook, zs_handle-zram2: Failed to create slab extension vector! (v6.12.28, amd64)

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Message-ID: <20250513140126.4fc4de8b@yea>
Date: Tue, 13 May 2025 14:01:26 +0200
From: Erhard Furtner <erhard_f@...lbox.org>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org
Subject: prepare_slab_obj_exts_hook, zs_handle-zram2: Failed to create slab
 extension vector! (v6.12.28, amd64)

Greetings!

Got that during building on my Thinkpad T495 on following zram disk:
NAME       ALGORITHM DISKSIZE   DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram2 lz4            32G 138.7M 16.1M 41.2M       8 /var/tmp

[...]
------------[ cut here ]------------
prepare_slab_obj_exts_hook, zs_handle-zram2: Failed to create slab extension vector!
WARNING: CPU: 6 PID: 17975 at mm/slub.c:2076 prepare_slab_obj_exts_hook+0x152/0x190
Modules linked in: cifs dns_resolver cifs_arc4 nls_ucs2_utils cifs_md4 snd_hrtimer snd_seq snd_seq_device rfcomm fuse zram lz4_decompress lz4_compress af_packet ccm algif_aead crypto_null des3_ede_x86_64 cbc des_generic libdes md5 cmac bnep nls_iso8859_15 nls_cp437 vfat fat dm_crypt nhpoly1305_avx2 nhpoly1305 chacha_generic chacha_x86_64 libchacha adiantum libpoly1305 algif_skcipher dm_mod btusb btrtl btmtk think_lmi btbcm btintel joydev edac_mce_amd wmi_bmof firmware_attributes_class snd_ctl_led bluetooth amdgpu input_leds evdev iwlmvm snd_hda_codec_realtek thinkpad_acpi mfd_core snd_hda_codec_generic mac80211 snd_hda_scodec_component drm_buddy libarc4 kvm_amd pkcs8_key_parser nvram drm_suballoc_helper platform_profile acpi_cpufreq sparse_keymap snd_hda_codec_hdmi led_class drm_exec battery k10temp i2c_algo_bit video snd_hda_intel ac drm_display_helper snd_intel_dspcfg iwlwifi snd_hda_codec backlight snd_hwdep gpu_sched snd_hda_core amdxcp snd_pcm drm_ttm_helper i2c_scmi snd_timer ttm cfg80211 wmi snd
 soundcore hwmon rfkill button processor efivarfs hid_generic usbhid hid sha512_ssse3 sha256_ssse3 sha1_ssse3 xhci_pci sha1_generic ehci_pci aesni_intel xhci_hcd ehci_hcd gf128mul crypto_simd cryptd ccp usbcore ucsi_acpi typec_ucsi roles typec usb_common
CPU: 6 UID: 0 PID: 17975 Comm: kworker/u32:11 Not tainted 6.12.28-gentoo-Zen1 #1
Hardware name: LENOVO 20NKS2PE00/20NKS2PE00, BIOS R12ET64W(1.34 ) 02/23/2024
Workqueue: writeback wb_workfn (flush-252:2)
RIP: 0010:prepare_slab_obj_exts_hook+0x152/0x190
Code: 31 f6 e9 51 49 75 00 cc 48 ff ca 48 89 d0 e9 3b ff ff ff 49 8b 56 58 48 c7 c7 c9 6f ea a0 48 c7 c6 d2 1b f4 a0 e8 46 7c e4 ff <0f> 0b e9 c8 fe ff ff 48 89 c1 48 c1 e1 34 0f 85 10 ff ff ff 48 f7
RSP: 0018:ffffaa7728fb33a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff99a3e8ec67c8 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000002800 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff99a3e8ec67c8
R13: ffffffffa029dbe8 R14: ffff99a490b5b800 R15: ffffe7c681a3b180
FS:  0000000000000000(0000) GS:ffff99a76fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f288f146000 CR3: 0000000104f8f000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 kmem_cache_alloc_noprof+0x141/0x278
 zs_malloc+0x50/0x1e8
 zram_submit_bio+0x1b9/0x898 [zram]
 __submit_bio+0x122/0x1a0
 submit_bio_noacct_nocheck+0x19b/0x2d8
 ext4_io_submit+0x23/0x38
 ext4_bio_write_folio+0x313/0x348
 mpage_submit_folio+0x63/0x90
 mpage_process_page_bufs+0x10a/0x160
 mpage_prepare_extent_to_map+0x2fb/0x410
 ext4_do_writepages+0x2bc/0xaf0
 ? zram_submit_bio+0x81f/0x898 [zram]
 ? srso_return_thunk+0x5/0x5f
 ? xas_load+0x9/0xf8
 ? srso_return_thunk+0x5/0x5f
 ? filemap_get_entry+0x160/0x178
 ? srso_return_thunk+0x5/0x5f
 ? __filemap_get_folio+0x22a/0x2b8
 ? srso_return_thunk+0x5/0x5f
 ? srso_return_thunk+0x5/0x5f
 ? __find_get_block+0x262/0x2a8
 ext4_writepages+0x91/0x148
 do_writepages+0xe3/0x2a8
 ? srso_return_thunk+0x5/0x5f
 ? __ext4_get_inode_loc_noinmem+0x22/0x70
 ? srso_return_thunk+0x5/0x5f
 ? ext4_write_inode+0x115/0x148
 __writeback_single_inode+0x2c/0x180
 writeback_sb_inodes+0x223/0x430
 __writeback_inodes_wb+0x59/0xf0
 wb_writeback+0x117/0x1a0
 wb_workfn+0x230/0x318
 process_scheduled_works+0x215/0x380
 worker_thread+0x1bf/0x288
 ? __cfi_worker_thread+0x8/0x8
 kthread+0xf4/0x118
 ? __cfi_kthread+0x8/0x8
 ret_from_fork+0x48/0x58
 ? __cfi_kthread+0x8/0x8
 ret_from_fork_asm+0x11/0x20
 </TASK>
---[ end trace 0000000000000000 ]---


Apart from that the machine kept running. So far that also occured once only.

Kernel .config and full dmesg attached.

Regards,
Erhard

Download attachment "config_61228_zen1" of type "application/octet-stream" (151045 bytes)

Download attachment "dmesg_61228_zen1" of type "application/octet-stream" (80843 bytes)