b44 Ethernet driver null pointer during initialization

Bug #1821564 reported by Boris Gjenero on 2019-03-25
30
This bug affects 5 people
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Undecided
Unassigned

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.

Boris Gjenero (boris-gjenero) wrote :

This change was made by a bot.

Changed in linux (Ubuntu):
status: New → Confirmed
tags: added: cosmic
Boris Gjenero (boris-gjenero) wrote :

Sorry, I mean bug is not present in 4.18.0-16-generic and present in 5.0.0-7-generic

Kai-Heng Feng (kaihengfeng) wrote :

Ok, I failed to find where the regression comes from.

Would it be possible for you to do a kernel bisection?

First, find the last good -rc kernel and the first bad -rc kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/

Then,
$ sudo apt build-dep linux
$ git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
$ cd linux
$ git bisect start
$ git bisect good $(the good version you found)
$ git bisect bad $(the bad version found)
$ make localmodconfig
$ make -j`nproc` deb-pkg
Install the newly built kernel, then reboot with it.
If the issue still happens,
$ git bisect bad
Otherwise,
$ git bisect good
Repeat to "make -j`nproc` deb-pkg" until you find the commit that causes the regression.

Hans P. Möller (hmollercl) wrote :

I just tested Kernel 4.20.17 an it is good. I will do the bisect but I don't have much time at this moment

Boris Gjenero (boris-gjenero) wrote :

linux-image-unsigned-4.20.0-042000-generic_4.20.0-042000.201812232030_amd64.deb is good but linux-image-unsigned-5.0.0-050000rc1-generic_5.0.0-050000rc1.201901062130_amd64.deb is bad. I'm not sure I'll have time for a git bisect.

Hans P. Möller (hmollercl) wrote :

@Boris please test kernel 5.1.0-050100rc3-generic (or above) at least #1822913 was solved with this kernel

Nelson Hennemann F (nelsonhef) wrote :
Download full text (5.5 KiB)

@Hans P Möller, i've tested with kernel 5.1.0-050100rc3-generic and the b44 module loaded and worked fine, but it created some others warnings in the dmesg:

[ 44.045886] b44 0000:02:09.0: swiotlb buffer is full (sz: 1566 bytes)
[ 44.045906] WARNING: CPU: 1 PID: 565 at kernel/dma/direct.c:43 report_addr+0x37/0x60
[ 44.045908] Modules linked in: snd_hda_codec_analog snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep r8188eu(C) snd_pcm snd_seq_midi snd_seq_midi_event lib80211 radeon cfg80211 snd_rawmidi joydev input_leds dcdbas coretemp ttm drm_kms_helper snd_seq drm i2c_algo_bit fb_sys_fops syscopyarea sysfillrect serio_raw snd_seq_device sysimgblt snd_timer snd soundcore mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 pata_acpi hid_generic usbhid hid psmouse b44 ssb mii pata_atiixp i2c_piix4 ahci libahci
[ 44.045940] CPU: 1 PID: 565 Comm: NetworkManager Tainted: G WC 5.1.0-050100rc3-generic #201904010618
[ 44.045942] Hardware name: Dell Inc. OptiPlex 320 /0UT237, BIOS 1.1.12 06/17/2009
[ 44.045944] RIP: 0010:report_addr+0x37/0x60
[ 44.045946] Code: 48 8b 87 30 02 00 00 48 89 75 f8 48 85 c0 74 2a 4c 8b 00 b8 fe ff ff ff 49 39 c0 76 11 80 3d f7 6b 72 01 00 0f 84 cf 07 00 00 <0f> 0b c9 c3 48 83 bf 40 02 00 00 00 74 f2 eb e3 80 3d db 6b 72 01
[ 44.045947] RSP: 0018:ffff9fb4808af478 EFLAGS: 00010246
[ 44.045949] RAX: 00000000fffffffe RBX: ffff88a93bc1f0b0 RCX: 0000000000000000
[ 44.045950] RDX: 000000000000061e RSI: 000000007a2df880 RDI: ffff88a93bc1f0b0
[ 44.045951] RBP: ffff9fb4808af480 R08: 000000003fffffff R09: 0000000000000004
[ 44.045952] R10: 0000000000000000 R11: 0000000000000001 R12: 000000000000061e
[ 44.045953] R13: ffff88a92cc35500 R14: 0000000000000000 R15: ffff88a93c2898c0
[ 44.045955] FS: 00007fd85987abc0(0000) GS:ffff88a93fc40000(0000) knlGS:0000000000000000
[ 44.045956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 44.045957] CR2: 00007f0e4401e008 CR3: 0000000033e44000 CR4: 00000000000006e0
[ 44.045958] Call Trace:
[ 44.045964] dma_direct_map_page+0xdf/0xf0
[ 44.045971] b44_alloc_rx_skb+0x18e/0x3f0 [b44]
[ 44.045973] b44_init_rings+0xbe/0x1b0 [b44]
[ 44.045976] b44_open+0xfc/0x3f0 [b44]
[ 44.045980] __dev_open+0xd4/0x170
[ 44.045982] __dev_change_flags+0x18f/0x200
[ 44.045984] dev_change_flags+0x27/0x60
[ 44.045986] do_setlink+0x32c/0xe30
[ 44.045991] ? __nla_parse+0xf1/0x120
[ 44.045995] ? cpumask_next+0x1b/0x20
[ 44.045998] ? __snmp6_fill_stats64.isra.57+0xf6/0x120
[ 44.046000] ? __nla_parse+0x38/0x120
[ 44.046002] __rtnl_newlink+0x52a/0x8f0
[ 44.046004] ? __nla_put+0x20/0x30
[ 44.046007] ? __kmalloc_node_track_caller+0x1db/0x2b0
[ 44.046009] ? pskb_expand_head+0x70/0x2e0
[ 44.046011] ? __kmalloc_reserve.isra.53+0x31/0x90
[ 44.046014] ? apparmor_inet_conn_request+0x40/0x40
[ 44.046017] ? security_sock_rcv_skb+0x2f/0x50
[ 44.046019] ? sk_filter_trim_cap+0x48/0x210
[ 44.046020] ? skb_queue_tail+0x43/0x50
[ 44.046024] ? __netlink_sendskb+0x53/0x70
[ 44.046029] ? fib6_clean_node+0x40/0x180
[ 44.046032] ? _cond_re...

Read more...

Boris Gjenero (boris-gjenero) wrote :

I don't normally use Ethernet on my laptop, and for some reason the b44 module for Ethernet doesn't get loaded normally. So I didn't notice this. But I'm getting the same problem reported in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1821564/comments/8 in Ubuntu 19.10 with linux-image-5.3.0-24-generic on my Inspiron 6400. This Debian bug report has some ideas about a cause: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=939697

Boris Gjenero (boris-gjenero) wrote :

This problem still exists in Ubuntu Focal Fossa (development branch) 20.04 with linux-image-5.4.0-21-generic. It also exists in linux-image-unsigned-5.6.2-050602-generic_5.6.2-050602.202004020822_amd64.deb

With linux-image-5.4.0-21-generic I didn't get any error messages after "insmod b44" in recovery mode. Also I normally booted linux-image-5.4.0-21-generic with mem=1G (limiting available memory to 1 GB) twice and also didn't get error messages after "sudo insmod b44". These symptoms are consistent with the hypothesis that swiotlb bounce buffers normally get allocated above 1 GB, causing a problem for b44 because the device can't do DMA above 1 GB and the driver can't handle this situation. That's the same problem discussed in this thread from 2011 https://groups.google.com/forum/#!topic/linux.kernel/GEx80ZCue1o

Obviously limiting memory to 1 GB has an unacceptable performance penalty, but it's nice to have at least one way to get working Ethernet.

Nelson Hennemann F (nelsonhef) wrote :

@Boris Gjenero, try using the kernel parameter "iommu=soft" instead of limiting the memory to 1GB. It will force the use of a 64MB swiotlb bounce buffer to workaround this issue. Tested with Focal Fossa Beta ISO (Kernel 5.4.0-21-generic) on my Optiplex 320 with 2GB of RAM.

Boris Gjenero (boris-gjenero) wrote :

 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.

Kai-Heng Feng (kaihengfeng) wrote :

Please test latest 20.04 kernel.

Changed in linux (Ubuntu):
status: Confirmed → Incomplete
Boris Gjenero (boris-gjenero) wrote :
Download full text (6.4 KiB)

I don't see a null pointer message but the b44 driver is still broken in 5.4.0-33-generic on my Dell Inspiron 6400:

[ 3148.539194] ssb: Found chip with id 0x4401, rev 0x02 and package 0x00
[ 3148.599317] b44 0000:03:00.0: Sonics Silicon Backplane found on PCI device 0000:03:00.0
[ 3148.599414] b44: Broadcom 44xx/47xx 10/100 PCI ethernet driver version 2.0
[ 3148.627839] b44 ssb1:0 eth0: Broadcom 44xx/47xx 10/100 PCI ethernet driver 00:15:c5:b3:8a:ba
[ 3148.684246] swiotlb_tbl_map_single: 14 callbacks suppressed
[ 3148.684251] b44 0000:03:00.0: swiotlb buffer is full (sz: 1566 bytes), total 0 (slots), used 0 (slots)
[ 3148.684261] ------------[ cut here ]------------
[ 3148.684267] WARNING: CPU: 0 PID: 36638 at kernel/dma/direct.c:35 report_addr+0x37/0x60
[ 3148.684268] Modules linked in: b44 mii iptable_filter bpfilter ccm b43 dell_laptop dell_smm_hwmon snd_hda_codec_hdmi cordic kvm snd_hda_codec_idt snd_hda_codec_generic bcma ledtrig_audio radeon dell_wmi snd_hda_intel snd_intel_dspcfg dell_smbios dcdbas input_leds joydev mac80211 snd_hda_codec r852 sparse_keymap wmi_bmof serio_raw dell_wmi_descriptor ttm sm_common snd_hda_core nand snd_hwdep drm_kms_helper nand_ecc snd_pcm cfg80211 bch i2c_algo_bit snd_timer fb_sys_fops r592 nandcore mtd memstick syscopyarea sysfillrect snd libarc4 sysimgblt soundcore mac_hid sch_fq_codel coretemp parport_pc ppdev lp parport drm ip_tables x_tables autofs4 ssb_hcd gpio_ich pata_acpi i2c_i801 psmouse lpc_ich firewire_ohci sdhci_pci cqhci firewire_core sdhci crc_itu_t ssb wmi video
[ 3148.684314] CPU: 0 PID: 36638 Comm: NetworkManager Not tainted 5.4.0-33-generic #37-Ubuntu
[ 3148.684315] Hardware name: Dell Inc. MM061 /0XD720, BIOS A17 06/13/2007
[ 3148.684318] RIP: 0010:report_addr+0x37/0x60
[ 3148.684320] Code: 48 8b 87 28 02 00 00 48 89 75 f8 48 85 c0 74 2a 4c 8b 00 b8 fe ff ff ff 49 39 c0 76 11 80 3d db c3 71 01 00 0f 84 7d 07 00 00 <0f> 0b c9 c3 48 83 bf 38 02 00 00 00 74 f2 eb e3 80 3d bf c3 71 01
[ 3148.684321] RSP: 0018:ffff9ae68055b450 EFLAGS: 00010246
[ 3148.684323] RAX: 00000000fffffffe RBX: 0000000000000000 RCX: 0000000000000000
[ 3148.684324] RDX: 000000000000061e RSI: 000000006b440a80 RDI: ffff8cb34b4db0b0
[ 3148.684325] RBP: ffff9ae68055b458 R08: 000000003fffffff R09: 0000000000000004
[ 3148.684327] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8cb2f8b0c000
[ 3148.684328] R13: 000000000000061e R14: ffff8cb2f45cef00 R15: ffff8cb2f96ac8c0
[ 3148.684330] FS: 00007f02e05ca240(0000) GS:ffff8cb34c600000(0000) knlGS:0000000000000000
[ 3148.684331] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 3148.684333] CR2: 00007f5935e43f28 CR3: 00000000c6128000 CR4: 00000000000006f0
[ 3148.684334] Call Trace:
[ 3148.684340] dma_direct_map_page+0xdc/0xf0
[ 3148.684347] b44_alloc_rx_skb+0x1bb/0x4a0 [b44]
[ 3148.684348] ? dma_direct_alloc_pages+0x93/0x130
[ 3148.684351] b44_init_rings+0xb8/0x190 [b44]
[ 3148.684354] b44_open+0xfc/0x470 [b44]
[ 3148.684357] __dev_open+0xd4/0x170
[ 3148.684359] __dev_change_flags+0x191/0x1f0
[ 3148.684361] dev_change_flags+0x26/0x60
[ 3148.684364] do_setlink+0x82e/0x980
[ 3148.684368] ? cpumask_next+0x1b/0x20
[ 3148.684371] ? __snmp6_...

Read more...

Kai-Heng Feng (kaihengfeng) wrote :

Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc3/

If mainline kernel doesn't solve the issue please do a kernel bisection.

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