Greetings, I met this lockdep_assert_preemption_disabled() gripe when starting ltp zram tests. [ 69.508019] WARNING: CPU: 0 PID: 12 at ./include/linux/seqlock.h:271 br_multicast_update_querier.isra.61+0xd9/0xf0 [bridge] [ 69.508037] Modules linked in: af_packet(E) ip6table_mangle(E) ip6table_raw(E) iptable_raw(E) bridge(E) stp(E) llc(E) iscsi_ibft(E) iscsi_boot_sysfs(E) nfnetlink(E) ebtable_filter(E) rfkill(E) ebtables(E) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(E) bpfilter(E) usblp(E) joydev(E) intel_rapl_msr(E) intel_rapl_common(E) nls_iso8859_1(E) nls_cp437(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) kvm_intel(E) snd_hda_codec_realtek(E) snd_hda_codec_generic(E) snd_hda_codec_hdmi(E) ledtrig_audio(E) at24(E) regmap_i2c(E) iTCO_wdt(E) snd_hda_intel(E) snd_intel_dspcfg(E) mei_hdcp(E) kvm(E) intel_pmc_bxt(E) iTCO_vendor_support(E) snd_hda_codec(E) snd_hwdep(E) irqbypass(E) crct10dif_pclmul(E) crc32_pclmul(E) snd_hda_core(E) ghash_clmulni_intel(E) aesni_intel(E) r8169(E) crypto_simd(E) realtek(E) cryptd(E) i2c_i801(E) mdio_devres(E) snd_pcm(E) snd_timer(E) pcspkr(E) i2c_smbus(E) mei_me(E) libphy(E) snd(E) lpc_ich(E) mei(E) soundcore(E) mfd_core(E) fan(E) [ 69.508069] thermal(E) intel_smartconnect(E) sch_fq_codel(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) lockd(E) grace(E) fuse(E) sunrpc(E) configfs(E) hid_logitech_hidpp(E) hid_logitech_dj(E) uas(E) usb_storage(E) hid_generic(E) usbhid(E) nouveau(E) wmi(E) drm_ttm_helper(E) ttm(E) i2c_algo_bit(E) drm_kms_helper(E) syscopyarea(E) sysfillrect(E) sysimgblt(E) fb_sys_fops(E) ahci(E) cec(E) libahci(E) rc_core(E) xhci_pci(E) ehci_pci(E) drm(E) libata(E) ehci_hcd(E) xhci_hcd(E) usbcore(E) video(E) button(E) sd_mod(E) t10_pi(E) vfat(E) fat(E) virtio_blk(E) virtio_mmio(E) virtio_ring(E) virtio(E) ext4(E) crc32c_intel(E) crc16(E) mbcache(E) jbd2(E) sg(E) dm_multipath(E) dm_mod(E) scsi_dh_rdac(E) scsi_dh_emc(E) scsi_dh_alua(E) scsi_mod(E) msr(E) autofs4(E) [ 69.508098] CPU: 0 PID: 12 Comm: ksoftirqd/0 Kdump: loaded Tainted: G E 5.15.0.g3839cbc-rt3-master-rt-lockdep #12 [ 69.508100] Hardware name: MEDION MS-7848/MS-7848, BIOS M7848W08.20C 09/23/2013 [ 69.508101] RIP: 0010:br_multicast_update_querier.isra.61+0xd9/0xf0 [bridge] [ 69.508109] Code: 5f 85 c0 0f 85 66 ff ff ff 65 8b 05 11 5a 1b 5f a9 ff ff ff 7f 0f 85 54 ff ff ff 65 8b 05 d3 61 1b 5f 85 c0 0f 84 45 ff ff ff <0f> 0b e9 3e ff ff ff 0f 0b eb b7 66 66 2e 0f 1f 84 00 00 00 00 00 [ 69.508111] RSP: 0018:ffff8881008ab9c0 EFLAGS: 00010202 [ 69.508112] RAX: 0000000000000001 RBX: ffff8881076f12a0 RCX: 0000000000000001 [ 69.508113] RDX: 0000000000000001 RSI: ffffffff8204d9a5 RDI: ffffffff8209ee5e [ 69.508114] RBP: ffff8881008aba70 R08: 0000000000000000 R09: 0000000000000000 [ 69.508115] R10: ffff8881c56aa266 R11: 0000000000000005 R12: 0000000000000002 [ 69.508115] R13: 0000000000000002 R14: 0000000000000008 R15: ffff8881076f1148 [ 69.508116] FS: 0000000000000000(0000) GS:ffff88840ec00000(0000) knlGS:0000000000000000 [ 69.508117] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 69.508118] CR2: 000055809b1fe000 CR3: 0000000004a3e002 CR4: 00000000001706f0 [ 69.508119] Call Trace: [ 69.508125] br_multicast_select_querier+0x85/0xd0 [bridge] [ 69.508135] br_multicast_rcv+0x933/0x1c30 [bridge] [ 69.508159] ? br_fdb_update+0x61/0x480 [bridge] [ 69.508171] ? br_handle_frame_finish+0x1a8/0x510 [bridge] [ 69.508178] br_handle_frame_finish+0x1a8/0x510 [bridge] [ 69.508191] br_handle_frame+0x23a/0x500 [bridge] [ 69.508199] ? lock_is_held_type+0xdf/0x130 [ 69.508203] ? br_handle_frame_finish+0x510/0x510 [bridge] [ 69.508210] ? br_handle_frame_finish+0x510/0x510 [bridge] [ 69.508219] __netif_receive_skb_core+0x23f/0x1200 [ 69.508221] ? __lock_acquire+0x49b/0x1ab0 [ 69.508237] ? __netif_receive_skb_list_core+0xf8/0x260 [ 69.508238] __netif_receive_skb_list_core+0xf8/0x260 [ 69.508249] netif_receive_skb_list_internal+0x19b/0x340 [ 69.508257] napi_complete_done+0x100/0x1a0 [ 69.508262] rtl8169_poll+0x48f/0x550 [r8169] [ 69.508272] __napi_poll+0x2a/0x290 [ 69.508276] net_rx_action+0x228/0x280 [ 69.508286] __do_softirq+0xb5/0x516 [ 69.508292] ? smpboot_thread_fn+0x23/0x340 [ 69.508297] run_ksoftirqd+0x79/0xd0 [ 69.508299] smpboot_thread_fn+0x25d/0x340 [ 69.508303] ? smpboot_register_percpu_thread+0xe0/0xe0 [ 69.508306] kthread+0x193/0x1c0 [ 69.508310] ? set_kthread_struct+0x40/0x40 [ 69.508315] ret_from_fork+0x1f/0x30 [ 69.508332] irq event stamp: 169818 [ 69.508332] hardirqs last enabled at (169820): [<ffffffff810f35ea>] vprintk_store+0x33a/0x590 [ 69.508334] hardirqs last disabled at (169821): [<ffffffff810f3634>] vprintk_store+0x384/0x590 [ 69.508335] softirqs last enabled at (169444): [<ffffffff8107fd28>] run_ksoftirqd+0x88/0xd0 [ 69.508337] softirqs last disabled at (169450): [<ffffffff810aaaad>] smpboot_thread_fn+0x25d/0x340
