Excerpts from Paul Menzel's message of July 5, 2020 8:30 pm: > [Removed Rafael from CC] > > Dear Linux folks, > > > Am 05.07.20 um 11:22 schrieb Paul Menzel: > >> With an IBM S822LC with Ubuntu 20.04, after updating to Firefox 78.0, >> using Firefox seems to hang the system. This happened with self-built >> Linux 5.7-rc5+ and now with 5.8-rc3+. >> >> (At least I believe the Firefox update is causing this.) >> >> Log in is impossible, and using the Serial over LAN over IPMI shows the >> messages below. >> >>> [ 2620.579187] watchdog: BUG: soft lockup - CPU#125 stuck for 22s! >>> [swapper/125:0] >>> [ 2620.579378] Modules linked in: tcp_diag inet_diag unix_diag >>> xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 >>> xt_tcpudp ip6table_mangle ip6table_nat iptable_mangle iptable_nat >>> nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink >>> ip6table_filter ip6_tables iptable_filter bridge stp llc overlay xfs >>> kvm_hv kvm joydev binfmt_misc uas usb_storage vmx_crypto ofpart >>> cmdlinepart bnx2x powernv_flash mtd mdio crct10dif_vpmsum at24 >>> ibmpowernv ipmi_powernv ipmi_devintf powernv_rng ipmi_msghandler >>> opal_prd sch_fq_codel parport_pc nfsd ppdev lp auth_rpcgss nfs_acl >>> parport lockd grace sunrpc ip_tables x_tables autofs4 btrfs >>> blake2b_generic libcrc32c xor zstd_compress raid6_pq input_leds >>> mac_hid hid_generic ast drm_vram_helper drm_ttm_helper i2c_algo_bit >>> ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm >>> drm_panel_orientation_quirks ahci libahci usbhid hid crc32c_vpmsum >>> uio_pdrv_genirq uio >>> [ 2620.579537] CPU: 125 PID: 0 Comm: swapper/125 Tainted: G D >>> W L 5.8.0-rc3+ #1 >>> [ 2620.579552] NIP: c0000000010dad38 LR: c0000000010dad30 CTR: >>> c000000000237830 >>> [ 2620.579568] REGS: c00000ffcb8c7600 TRAP: 0900 Tainted: G D >>> W L (5.8.0-rc3+) >>> [ 2620.579582] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> CR: >>> 44004228 XER: 00000000 >>> [ 2620.579599] CFAR: c0000000010dad44 IRQMASK: 0 [ 2620.579599] GPR00: >>> c00000000023718c c00000ffcb8c7890 c000000001f9a900 0000000000000000 [ >>> 2620.579599] GPR04: c000000001fce438 0000000000000078 000000010008c1f2 >>> 0000000000000000 [ 2620.579599] GPR08: 000000ffd96a0000 >>> 0000000080000087 0000000000000000 c000000001fd25e0 [ 2620.579599] >>> GPR12: 0000000000004400 c00000ffff72f680 c000000001ea36d8 >>> c00000ffcb859800 [ 2620.579599] GPR16: c00000000166c880 >>> c0000000016f8e00 000000000000000a c00000ffcb859800 [ 2620.579599] >>> GPR20: 0000000000000100 c00000000166c918 c000000001fd21e8 >>> c00000ffcb859800 [ 2620.579599] GPR24: 000000ffd96a0000 >>> c000000001d44b80 c000000001d53780 0000000000000008 [ 2620.579599] >>> GPR28: c000000001fd21e0 0000000000000001 0000000000000000 >>> c000000001d44b80 [ 2620.579711] NIP [c0000000010dad38] >>> _raw_spin_lock_irqsave+0x98/0x120 >>> [ 2620.579724] LR [c0000000010dad30] _raw_spin_lock_irqsave+0x90/0x120 >>> [ 2620.579737] Call Trace: >>> [ 2620.579746] [c00000ffcb8c7890] [c0000000013c84a0] >>> ncsi_ops+0x209f50/0x2dc1d8 (unreliable) >>> [ 2620.579763] [c00000ffcb8c78d0] [c00000000023718c] rcu_core+0xfc/0x7a0 >>> [ 2620.579777] [c00000ffcb8c7970] [c0000000010db81c] >>> __do_softirq+0x17c/0x534 >>> [ 2620.579791] [c00000ffcb8c7aa0] [c0000000001786f4] irq_exit+0xd4/0x130 >>> [ 2620.579805] [c00000ffcb8c7ad0] [c000000000025eec] >>> timer_interrupt+0x13c/0x370 >>> [ 2620.579821] [c00000ffcb8c7b40] [c0000000000165c0] >>> replay_soft_interrupts+0x320/0x3f0 >>> [ 2620.579837] [c00000ffcb8c7d30] [c0000000000166d8] >>> arch_local_irq_restore+0x48/0xa0 >>> [ 2620.579853] [c00000ffcb8c7d50] [c000000000de2fe0] >>> cpuidle_enter_state+0x100/0x780
[snip] >> >> I have to warm reset the system to get it working again. > > I am unable to reproduce this with Ubuntu’s Linux Okay, not sure what that would be from, looks like RCU perhaps. Anyway if it comes up again, let us know. > With Linux 5.8-rc3+, I got now the beginning of the Linux messages. > >> [ 572.253008] Oops: Exception in kernel mode, sig: 5 [#1] >> [ 572.253198] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV >> [ 572.253232] Modules linked in: tcp_diag inet_diag unix_diag xt_CHECKSUM >> xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp >> ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack >> nf_defrag_ipv6 nf_defrag_ipv4 nf_tables nfnetlink ip6table_filter ip6_tables >> iptable_filter bridge stp llc overlay xfs kvm_hv kvm binfmt_misc joydev uas >> usb_storage vmx_crypto bnx2x crct10dif_vpmsum ofpart cmdlinepart >> powernv_flash mtd mdio ibmpowernv at24 ipmi_powernv ipmi_devintf >> ipmi_msghandler opal_prd powernv_rng sch_fq_codel parport_pc ppdev lp nfsd >> parport auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 >> btrfs blake2b_generic libcrc32c xor zstd_compress raid6_pq input_leds >> mac_hid hid_generic ast drm_vram_helper drm_ttm_helper i2c_algo_bit ttm >> drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm ahci >> drm_panel_orientation_quirks libahci usbhid hid crc32c_vpmsum >> uio_pdrv_genirq uio >> [ 572.253639] CPU: 4 PID: 6728 Comm: Web Content Not tainted 5.8.0-rc3+ #1 >> [ 572.253659] NIP: c00000000000ff5c LR: c00000000001a8f8 CTR: >> c0000000001d5f00 >> [ 572.253835] REGS: c000007f31f0f420 TRAP: 1500 Not tainted (5.8.0-rc3+) >> [ 572.253854] MSR: 900000000290b033 <SF,HV,VEC,VSX,EE,FP,ME,IR,DR,RI,LE> >> CR: 28c48482 XER: 20000000 >> [ 572.253888] CFAR: c00000000000fecc IRQMASK: 1 >> [ 572.253888] GPR00: c00000000001b228 c000007f31f0f6b0 c000000001f9a900 >> c000007f351544d0 >> [ 572.253888] GPR04: 0000000000000000 c000007f31f0fe90 c000007f351544f0 >> c000007f32e522b0 >> [ 572.253888] GPR08: 0000000000000000 0000000000002000 9000000000009033 >> c000007fbcd85800 >> [ 572.253888] GPR12: 0000000000008800 c000007fffffb680 0000000000000005 >> 0000000000000004 >> [ 572.253888] GPR16: c000007f35153800 c000007f35154130 0000000000000005 >> 0000000000000001 >> [ 572.253888] GPR20: 0000000000000024 c000007f32e51e68 c000007f35154028 >> 0000007fd8da0000 >> [ 572.253888] GPR24: 0000007fd8da0000 c000007f351544d0 c000007e9a4024d0 >> c000000001665f18 >> [ 572.253888] GPR28: c000007f351544d0 c000007f35153800 900000000290f033 >> c000007f35153800 >> [ 572.254079] NIP [c00000000000ff5c] save_fpu+0xa8/0x2ac >> [ 572.254098] LR [c00000000001a8f8] __giveup_fpu+0x28/0x80 >> [ 572.254114] Call Trace: >> [ 572.254128] [c000007f31f0f6b0] [c000007f35153980] 0xc000007f35153980 >> (unreliable) >> [ 572.254156] [c000007f31f0f6e0] [c00000000001b228] giveup_all+0x128/0x150 >> [ 572.254327] [c000007f31f0f710] [c00000000001c124] __switch_to+0x104/0x490 >> [ 572.254352] [c000007f31f0f770] [c0000000010d2e34] __schedule+0x2e4/0xa10 >> [ 572.254374] [c000007f31f0f840] [c0000000010d35d4] schedule+0x74/0x140 >> [ 572.254397] [c000007f31f0f870] [c0000000010d9478] >> schedule_timeout+0x358/0x5d0 >> [ 572.254424] [c000007f31f0f980] [c0000000010d5638] >> wait_for_completion+0xc8/0x210 >> [ 572.254451] [c000007f31f0fa00] [c000000000608ed4] do_coredump+0x3a4/0xd60 >> [ 572.254625] [c000007f31f0fba0] [c00000000018d1cc] get_signal+0x1dc/0xd00 >> [ 572.254648] [c000007f31f0fcc0] [c00000000001f088] >> do_notify_resume+0x158/0x450 >> [ 572.254672] [c000007f31f0fda0] [c000000000037d04] >> interrupt_exit_user_prepare+0x1c4/0x230 >> [ 572.254699] [c000007f31f0fe20] [c00000000000f2b4] >> interrupt_return+0x14/0x1c0 >> [ 572.254720] Instruction dump: >> [ 572.254882] dae60170 db060180 db260190 db4601a0 db6601b0 db8601c0 >> dba601d0 dbc601e0 >> [ 572.254912] dbe601f0 48000204 38800000 f0000250 <7c062798> f0000250 >> 38800010 f0210a50 >> [ 572.254946] ---[ end trace ba4452ee5c77d58e ]--- > > Please find all the messages attached. "Oops: Exception in kernel mode, sig: 5 [#1]" Unfortunately it's a very poor error message. I think it is a 0x1500 exception triggering in the kernel FP register saving. Do you have the CONFIG_PPC_DENORMALISATION config option set? Thanks, Nick
