iommu=soft does not help, and I don't understand why it would help theoretically when the Core 2 Duo T7400 CPU doesn't have a hardware IOMMU. The problem seems to be that the 64 MB buffer is allocated beyond 1 GB.
One theoretical good workaround would be to boot up with only 1 GB and then enable the rest of memory. But I'm not sure how to do that. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1821564 Title: b44 Ethernet driver null pointer during initialization Status in linux package in Ubuntu: Confirmed Bug description: This problem started after upgrading to Ubuntu 19.04. It was not present with 4.18.0-16-generic kernel and is present in the 4.18.0-15-generic kernel. Ever time during boot there is a null pointer dereference in the b44 driver for the on-board Ethernet on this Dell Inspiron 6400. After that I can log in but networking related commands hang and the computer eventually locks up. Blacklisting the b44 module so it doesn't load works as a workaround, though of course the on board Ethernet can't be used that way. The b43 WiFi still works then. The following is pasted from the log of one crash: 6.483003] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 6.483052] #PF error: [normal kernel read fault] 6.483093] PGD 0 P4D 0 6.483133] Oops: 0000 [#1] SMP PTI 6.483175] CPU: 0 PID: 725 Comm: NetworkManager Tainted: G W 5.0.0-7-generic #8-Ubuntu 6.483217] Hardware name: Dell Inc. MM061 /0XD720, BIOS A17 06/13/2007 6.483267] RIP: 0010:swiotlb_tbl_map_single+0x120/0x310 6.483310] Code: 4c 8b 45 a8 4c 8b 1d 0f b2 a9 01 89 d3 45 31 d2 44 8b 4d a4 44 89 c7 41 89 dc 4b 8d 44 25 00 48 21 f0 48 01 f8 49 39 c7 72 0a <47> 39 0c a3 0f 83 cb 00 00 00 42 8d 04 33 48 89 c3 48 39 c1 41 0f 6.483368] RSP: 0018:ffffbc7040c7f3c0 EFLAGS: 00010016 6.483416] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 6.483467] RDX: 0000000000000000 RSI: 00000000001fffff RDI: 0000000000000001 6.483521] RBP: ffffbc7040c7f420 R08: 0000000000000001 R09: 0000000000000001 6.483572] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 6.483621] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000200000 6.483670] FS: 00007f2cb49ccbc0(0000) GS:ffff9d8a4c400000(0000) knlGS:0000000000000000 6.483726] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 6.483773] CR2: 0000000000000000 CR3: 00000000c72ce000 CR4: 00000000000006f0 6.483820] Call Trace: 6.483869] swiotlb_map+0x6c/0x1c0 6.483915] dma_direct_map_page+0xc5/0x160 6.483965] b44_alloc_rx_skb+0x18e/0x3f0 [b44] 6.484013] b44_init_rings+0xbe/0x1b0 [b44] 6.484060] b44_open+0xfc/0x3f0 [b44] 6.484107] __dev_open+0xd4/0x170 6.484153] __dev_change_flags+0x18f/0x200 6.484199] dev_change_flags+0x27/0x60 6.484246] do_setlink+0x31c/0xe30 6.484292] ? __nla_parse+0xf1/0x120 6.484340] ? cpumask_next+0x1b/0x20 6.484388] ? __snmp6_fill_stats64.isra.57+0xf6/0x120 6.484439] ? __nla_parse+0x38/0x120 6.484488] __rtnl_newlink+0x531/0x910 6.484535] ? __nla_put+0x20/0x30 6.484586] ? __kmalloc_node_track_caller+0x1e6/0x2b0 6.484636] ? pskb_expand_head+0x70/0x2e0 6.484693] ? __kmalloc_reserve.isra.53+0x31/0x90 6.484751] ? apparmor_inet_conn_request+0x40/0x40 6.484822] ? security_sock_rcv_skb+0x2f/0x50 6.484879] ? skb_queue_tail+0x43/0x50 6.484934] ? __netlink_sendskb+0x53/0x70 6.484992] ? syscall_return_via_sysret+0xf/0x7f 6.485043] ? __switch_to_asm+0x40/0x70 6.485097] ? syscall_return_via_sysret+0xf/0x7f 6.485153] ? _cond_resched+0x19/0x30 6.485204] ? kmem_cache_alloc_trace+0x153/0x1d0 6.485253] rtnl_newlink+0x48/0x70 6.485301] rtnetlink_rcv_msg+0x213/0x300 6.485348] ? __d_lookup+0x126/0x140 6.485393] ? rtnl_calcit.isra.31+0x100/0x100 6.485440] netlink_rcv_skb+0x4f/0x120 6.485485] rtnetlink_rcv+0x15/0x20 6.485518] netlink_unicast+0x1a1/0x260 6.485518] netlink_sendmsg+0x20d/0x3c0 6.485518] sock_sendmsg+0x3e/0x50 6.485518] ___sys_sendmsg+0x295/0x2f0 6.485518] ? rtnl_unlock+0xe/0x10 6.485518] ? addrconf_sysctl_forward+0x114/0x280 6.485518] ? dev_forward_change+0x140/0x140 6.485518] ? __fget_light+0x54/0x60 6.485518] __sys_sendmsg+0x5c/0xa0 6.485518] __x64_sys_sendmsg+0x1f/0x30 6.485518] do_syscall_64+0x5a/0x110 6.485518] entry_SYSCALL_64_after_hwframe+0x44/0xa9 6.485518] RIP: 0033:0x7f2cb6153cb7 6.485518] Code: 44 00 00 41 54 41 89 d4 55 48 89 f5 53 89 fb 48 83 ec 10 e8 3b ed ff ff 44 89 e2 48 89 ee 89 df 41 89 c0 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 48 89 44 24 08 e8 74 ed ff ff 48 6.485518] RSP: 002b:00007ffe93a35c80 EFLAGS: 00000293 ORIG_RAX: 000000000000002e 6.485518] RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007f2cb6153cb7 6.485518] RDX: 0000000000000000 RSI: 00007ffe93a35cd0 RDI: 0000000000000008 6.485518] RBP: 00007ffe93a35cd0 R08: 0000000000000000 R09: 0000000000000000 6.485518] R10: 00007f2cb6139ca0 R11: 0000000000000293 R12: 0000000000000000 6.485518] R13: 00005598b029e880 R14: 00007ffe93a35e7c R15: 0000000000000000 6.485518] Modules linked in: arc4 b43 cordic snd_hda_codec_hdmi ttm bcma dell_laptop snd_hda_codec_idt snd_hda_codec_generic dell_smm_hwmon drm_kms_helper dell_wmi ledtrig_audio snd_hda_intel kvm mac80211 dell_smbios dcdbas drm joydev snd_hda_codec r852 irqbypass input_leds sm_common sparse_keymap wmi_bmof dell_wmi_descriptor snd_hda_core i2c_algo_bit snd_hwdep cfg80211 serio_raw snd_pcm nand fb_sys_fops snd_timer r592 syscopyarea nand_ecc snd nand_bch sysfillrect soundcore sysimgblt bch memstick mtd mac_hid sch_fq_codel cuse coretemp parport_pc ppdev lp parport ip_tables x_tables autofs4 ssb_hcd b44 gpio_ich psmouse firewire_ohci sdhci_pci pata_acpi cqhci lpc_ich sdhci firewire_core mii crc_itu_t ssb wmi video 6.485518] CR2: 0000000000000000 6.486827] ---[ end trace e1f8c8555dcc75b5 ]--- 6.486884] RIP: 0010:swiotlb_tbl_map_single+0x120/0x310 6.486939] Code: 4c 8b 45 a8 4c 8b 1d 0f b2 a9 01 89 d3 45 31 d2 44 8b 4d a4 44 89 c7 41 89 dc 4b 8d 44 25 00 48 21 f0 48 01 f8 49 39 c7 72 0a <47> 39 0c a3 0f 83 cb 00 00 00 42 8d 04 33 48 89 c3 48 39 c1 41 0f 6.487025] RSP: 0018:ffffbc7040c7f3c0 EFLAGS: 00010016 6.487078] RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000 6.487131] RDX: 0000000000000000 RSI: 00000000001fffff RDI: 0000000000000001 6.487186] RBP: ffffbc7040c7f420 R08: 0000000000000001 R09: 0000000000000001 6.487241] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 6.487292] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000200000 6.487346] FS: 00007f2cb49ccbc0(0000) GS:ffff9d8a4c400000(0000) knlGS:0000000000000000 6.487409] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 6.487462] CR2: 0000000000000000 CR3: 00000000c72ce000 CR4: 00000000000006f0 ProblemType: Bug DistroRelease: Ubuntu 19.04 Package: linux-image-5.0.0-7-generic 5.0.0-7.8 ProcVersionSignature: Ubuntu 5.0.0-7.8-generic 5.0.0 Uname: Linux 5.0.0-7-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version k5.0.0-7-generic. ApportVersion: 2.20.10-0ubuntu23 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: STAC9200 Analog [STAC9200 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: bgjenero 1662 F.... pulseaudio Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xefffc000 irq 24' Mixer name : 'SigmaTel STAC9200' Components : 'HDA:83847690,102801bd,00102201 HDA:14f12bfa,14f100c3,00090000' Controls : 22 Simple ctrls : 9 CurrentDesktop: XFCE Date: Mon Mar 25 02:13:47 2019 HibernationDevice: RESUME=UUID=62d89c78-536c-42ab-968d-463122f8c3a2 InstallationDate: Installed on 2012-01-19 (2622 days ago) InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub MachineType: Dell Inc. MM061 ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-7-generic root=UUID=d590f141-7b8d-421d-84b3-baa43181a241 ro resume=/dev/sda6 pcie_aspm=force RelatedPackageVersions: linux-restricted-modules-5.0.0-7-generic N/A linux-backports-modules-5.0.0-7-generic N/A linux-firmware 1.178 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux UpgradeStatus: Upgraded to disco on 2019-03-25 (0 days ago) dmi.bios.date: 06/13/2007 dmi.bios.vendor: Dell Inc. dmi.bios.version: A17 dmi.board.name: 0XD720 dmi.board.vendor: Dell Inc. dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA17:bd06/13/2007:svnDellInc.:pnMM061:pvr:rvnDellInc.:rn0XD720:rvr:cvnDellInc.:ct8:cvr: dmi.product.name: MM061 dmi.sys.vendor: Dell Inc. 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