On 4/20/20 1:15 PM, Raymond Jennings wrote: > I got a bug check and the guys in #kernelnewbies in oftc told me to email you > guys about it, not sure what to do about it +CC zswap maintainers > 2036206:Apr 20 03:22:51 metalhead kernel: [103376.518888] kernel BUG at > mm/zswap.c:1184! Hmm that's this: ret = crypto_comp_decompress(tfm, src, entry->length, dst, &dlen); put_cpu_ptr(entry->pool->tfm); kunmap_atomic(dst); zpool_unmap_handle(entry->pool->zpool, entry->handle); BUG_ON(ret); Looks like decompression failed? Are there any messages prior to the BUG that would indicate the failed decompression? >From loaded modules it seems like z3fold and lz4_decompress could be in use here. What's the output of: grep . /sys/module/zswap/parameters/* And is this reproducible? Or happened just once? Is it a regression after kernel update? > 2036207-Apr 20 03:22:51 metalhead kernel: [103376.518893] invalid opcode: 0000 > [#1] PREEMPT SMP PTI > 2036208-Apr 20 03:22:51 metalhead kernel: [103376.518895] CPU: 5 PID: 2008 Comm: > swapoff Not tainted 5.6.5-gentoo-x86_64 #1 > 2036209-Apr 20 03:22:51 metalhead kernel: [103376.518896] Hardware name: Dell > Inc. OptiPlex 7020/02YYK5, BIOS A15 02/02/2018 > 2036210-Apr 20 03:22:51 metalhead kernel: [103376.518900] RIP: > 0010:zswap_frontswap_load+0x238/0x250 > 2036211-Apr 20 03:22:51 metalhead kernel: [103376.518901] Code: 00 00 e8 bb 04 > e5 ff 65 8b 05 3c d3 dc 71 85 c0 0f 85 61 ff ff ff e8 3b 74 db ff e9 57 ff ff ff > e8 31 74 db ff e9 35 ff ff ff <0f> 0b e8 25 74 db ff e9 00 ff ff ff e8 37 13 e2 > ff 0f 1f 80 00 00 > 2036212-Apr 20 03:22:51 metalhead kernel: [103376.518902] RSP: > 0018:ffffa7ed41f6fb20 EFLAGS: 00010282 > 2036213-Apr 20 03:22:51 metalhead kernel: [103376.518903] RAX: 0000000080000000 > RBX: 00000000ffffffea RCX: 0000000000000000 > 2036214-Apr 20 03:22:51 metalhead kernel: [103376.518904] RDX: 0000000000000001 > RSI: 0000000000000000 RDI: 00000000ffffffff > 2036215-Apr 20 03:22:51 metalhead kernel: [103376.518905] RBP: ffff8f37e9eab2a0 > R08: ffff8f3a308de780 R09: 0000000000000000 > 2036216-Apr 20 03:22:51 metalhead kernel: [103376.518905] R10: 0000000000000000 > R11: ffffa7ed41f6fb00 R12: ffff8f37bf4e4000 > 2036217-Apr 20 03:22:51 metalhead kernel: [103376.518906] R13: ffff8f3bf6908d28 > R14: ffff8f3bf6908d20 R15: ffff8f3bc7cc5ec8 > 2036218-Apr 20 03:22:51 metalhead kernel: [103376.518907] FS: > 00007fc9c4cf0780(0000) GS:ffff8f3cfda00000(0000) knlGS:0000000000000000 > 2036219-Apr 20 03:22:51 metalhead kernel: [103376.518908] CS: 0010 DS: 0000 ES: > 0000 CR0: 0000000080050033 > 2036220-Apr 20 03:22:51 metalhead kernel: [103376.518909] CR2: 00007f9e8a1d471c > CR3: 0000000300754005 CR4: 00000000001606e0 > 2036221-Apr 20 03:22:51 metalhead kernel: [103376.518909] Call Trace: > 2036222-Apr 20 03:22:51 metalhead kernel: [103376.518916] > __frontswap_load+0x9c/0xf0 > 2036223-Apr 20 03:22:51 metalhead kernel: [103376.518918] swap_readpage+0xfb/0x330 > 2036224-Apr 20 03:22:51 metalhead kernel: [103376.518920] > swap_cluster_readahead+0x1da/0x300 > 2036225-Apr 20 03:22:51 metalhead kernel: [103376.518922] ? 0xffffffff8e000000 > 2036226-Apr 20 03:22:51 metalhead kernel: [103376.518924] > swapin_readahead+0x2e4/0x4a0 > 2036227-Apr 20 03:22:51 metalhead kernel: [103376.518926] ? > put_swap_page+0x106/0x310 > 2036228-Apr 20 03:22:51 metalhead kernel: [103376.518928] > unuse_pte_range+0x167/0x760 > 2036229-Apr 20 03:22:51 metalhead kernel: [103376.518930] try_to_unuse+0x5a1/0x730 > 2036230-Apr 20 03:22:51 metalhead kernel: [103376.518932] > __do_sys_swapoff+0x1df/0x6d0 > 2036231-Apr 20 03:22:51 metalhead kernel: [103376.518935] ? > exit_to_usermode_loop+0x97/0xf0 > 2036232-Apr 20 03:22:51 metalhead kernel: [103376.518937] do_syscall_64+0x55/0x1b0 > 2036233-Apr 20 03:22:51 metalhead kernel: [103376.518942] > entry_SYSCALL_64_after_hwframe+0x44/0xa9 > 2036234-Apr 20 03:22:51 metalhead kernel: [103376.518944] RIP: 0033:0x7fc9c4e25657 > 2036235-Apr 20 03:22:51 metalhead kernel: [103376.518945] Code: 73 01 c3 48 8b > 0d 39 b8 0c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f > 44 00 00 b8 a8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 09 b8 0c 00 > f7 d8 64 89 01 48 > 2036236-Apr 20 03:22:51 metalhead kernel: [103376.518946] RSP: > 002b:00007ffc715f01e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a8 > 2036237-Apr 20 03:22:51 metalhead kernel: [103376.518947] RAX: ffffffffffffffda > RBX: 0000000000000000 RCX: 00007fc9c4e25657 > 2036238-Apr 20 03:22:51 metalhead kernel: [103376.518948] RDX: 0000000000000001 > RSI: 0000000000000003 RDI: 0000557e405007b0 > 2036239-Apr 20 03:22:51 metalhead kernel: [103376.518948] RBP: 00007ffc715f1442 > R08: 0000557e404fe580 R09: 0000000000000001 > 2036240-Apr 20 03:22:51 metalhead kernel: [103376.518949] R10: 00007fc9c50018e0 > R11: 0000000000000206 R12: 0000000000000000 > 2036241-Apr 20 03:22:51 metalhead kernel: [103376.518949] R13: 0000557e405007b0 > R14: 0000000000000000 R15: 0000000000000000 > 2036242-Apr 20 03:22:51 metalhead kernel: [103376.518951] Modules linked in: > z3fold bfq ipt_REJECT nf_reject_ipv4 xt_multiport iptable_filter ip_tables > af_packet snd_hda_codec_hdmi i915 i2c_algo_bit drm_kms_helper intel_rapl_msr > intel_rapl_common cec uvcvideo x86_pkg_temp_thermal intel_powerclamp > snd_hda_codec_generic drm dell_wmi ledtrig_audio videobuf2_vmalloc sparse_keymap > iTCO_wdt kvm_intel wmi_bmof videobuf2_memops dell_smbios dell_wmi_descriptor > iTCO_vendor_support snd_hda_intel snd_usb_audio drm_panel_orientation_quirks > dcdbas snd_usbmidi_lib snd_rawmidi mousedev videobuf2_v4l2 kvm videobuf2_common > videodev intel_gtt agpgart snd_seq_device irqbypass input_leds joydev > syscopyarea snd_intel_dspcfg sysfillrect sysimgblt fb_sys_fops binfmt_misc > crct10dif_pclmul i2c_i801 ghash_clmulni_intel snd_hda_codec i2c_core > intel_cstate video wmi snd_hwdep intel_uncore snd_hda_core snd_pcm e1000e > intel_rapl_perf snd_timer snd backlight evbug lpc_ich evdev pcspkr soundcore > mfd_core coretemp hwmon aesni_intel crypto_simd cryptd glue > 2036243-Apr 20 03:22:51 metalhead kernel: helper > 2036244-Apr 20 03:22:51 metalhead kernel: [103376.518983] algif_rng algif_aead > algif_hash algif_skcipher af_alg crc32c_intel crc32_pclmul crc32_generic > configfs overlay squashfs lz4_decompress loop btrfs xor ext4 mbcache jbd2 > raid6_pq libcrc32c dm_snapshot dm_mirror dm_region_hash dm_log_userspace dm_log > dm_bufio dm_mod firewire_core crc_itu_t hid_generic usbhid ohci_hcd usb_storage > hid xhci_plat_hcd xhci_pci xhci_hcd ehci_pci ehci_hcd usbcore usb_common > scsi_transport_fc sr_mod cdrom sg sd_mod t10_pi ahci libahci libata scsi_mod > 2036245-Apr 20 03:22:51 metalhead kernel: [103376.519004] ---[ end trace > 5959740853c6dbd4 ]---
