Description
When adding eth0 to a bridge with a Pi3+ (Raspbian 2018-03-13) I get the following Oops on boot.
[ 5.451470] Unable to handle kernel NULL pointer dereference at virtual address 000001f0
[ 5.464412] pgd = b72e4000
[ 5.469282] [000001f0] *pgd=372e8835, *pte=00000000, *ppte=00000000
[ 5.478303] Internal error: Oops: 17 [#1] SMP ARM
[ 5.485414] Modules linked in: bridge stp llc brcmfmac brcmutil cfg80211 rfkill snd_bcm2835 snd_pcm snd_timer snd bcm2835_gpiomem uio_pdrv_genirq uio fixed ip_tables x_tables ipv6
[ 5.505733] CPU: 2 PID: 286 Comm: brctl Not tainted 4.9.80-v7+ #1098
[ 5.505737] Hardware name: BCM2835
[ 5.505745] task: b97ae740 task.stack: b6578000
[ 5.505763] PC is at phy_ethtool_gset+0x14/0x88
[ 5.505774] LR is at lan78xx_get_settings+0x3c/0xcc
[ 5.505783] pc : [<8054a3c8>] lr : [<80550df8>] psr: 60000013
[ 5.505783] sp : b6579d18 ip : b6579d28 fp : b6579d24
[ 5.505787] r10: 00000080 r9 : b9057500 r8 : b6579d54
[ 5.505793] r7 : 00000001 r6 : b9050000 r5 : b6579d98 r4 : 00000000
[ 5.505800] r3 : 80550dbc r2 : 00000001 r1 : b6579d54 r0 : 00000000
[ 5.505807] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 5.505813] Control: 10c5383d Table: 372e406a DAC: 00000055
[ 5.505818] Process brctl (pid: 286, stack limit = 0xb6578210)
[ 5.505825] Stack: (0xb6579d18 to 0xb657a000)
[ 5.505835] 9d00: b6579d4c b6579d28
[ 5.505845] 9d20: 80550df8 8054a3c0 80550dbc b9050000 b6579d98 b716ef80 00000001 80d04850
[ 5.505856] 9d40: b6579d94 b6579d50 8063d4ac 80550dc8 b9b39590 00000001 00000000 00000000
[ 5.505865] 9d60: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[ 5.505876] 9d80: b9050000 b9050000 b6579df4 b6579d98 7f4a148c 8063d420 b6579dc4 8025ec74
[ 5.505907] 9da0: b6579df4 b6579db0 8025ec74 8025ece0 b9b384b8 b9154090 a0000013 000003e5
[ 5.505924] 9dc0: b91d9400 a0000013 b9154084 b90574fc b9050000 b716ef80 00000001 80d04850
[ 5.505934] 9de0: b9057500 b91d8c00 b6579e1c b6579df8 7f4a1c98 7f4a1474 80c65740 b9057500
[ 5.505952] 9e00: 00000002 00000001 00000000 00000000 b6579e3c b6579e20 7f4a2af0 7f4a1b2c
[ 5.505971] 9e20: b6579e90 b9057000 b6579e90 7f4aeb54 b6579e54 b6579e40 7f4a34c0 7f4a2a9c
[ 5.505984] 9e40: 000089a2 b9057000 b6579e84 b6579e58 80653300 7f4a3464 80724638 80722d6c
[ 5.505995] 9e60: 00400100 000089a2 000089a2 80c65740 7ef69c14 b6579e90 b6579edc b6579e88
[ 5.506010] 9e80: 80653720 80653048 00000000 b746a220 00307262 00000000 00000000 00000000
[ 5.506021] 9ea0: 00000002 00000000 000260bc 00000000 b6579ed4 000089a2 fffffdfd 7ef69c14
[ 5.506037] 9ec0: 80c65740 00000003 b6578000 00000080 b6579efc b6579ee0 80616aa8 806533c0
[ 5.506056] 9ee0: 7ef69c14 b9b6b520 b9639300 000089a2 b6579f7c b6579f00 80283f68 806168b4
[ 5.506067] 9f00: 00025f08 00000002 00000036 40000028 76f0c80c 00000000 00000003 00000000
[ 5.506076] 9f20: 000089a2 00000000 7ef69c14 00000000 00000062 00000000 00025f08 00000000
[ 5.506089] 9f40: 00000002 00000000 b6578000 00025f08 00000002 b9639300 7ef69c14 b9639300
[ 5.506120] 9f60: 000089a2 00000003 b6578000 00000080 b6579fa4 b6579f80 80284720 80283ec8
[ 5.506134] 9f80: 00000062 00025f08 00000002 7ef69ee0 00000036 80108244 00000000 b6579fa8
[ 5.506144] 9fa0: 80108220 802846e8 00025f08 00000002 00000003 000089a2 7ef69c14 00000062
[ 5.506173] 9fc0: 00025f08 00000002 7ef69ee0 00000036 00000000 00000000 76fc9000 00000000
[ 5.506184] 9fe0: 76f0c800 7ef69bfc 00013ae0 76f0c80c 60000010 00000003 00000000 00000000
[ 5.506208] [<8054a3c8>] (phy_ethtool_gset) from [<80550df8>] (lan78xx_get_settings+0x3c/0xcc)
[ 5.506226] [<80550df8>] (lan78xx_get_settings) from [<8063d4ac>] (__ethtool_get_link_ksettings+0x98/0xe0)
[ 5.506308] [<8063d4ac>] (__ethtool_get_link_ksettings) from [<7f4a148c>] (port_cost+0x24/0x80 [bridge])
[ 5.506448] [<7f4a148c>] (port_cost [bridge]) from [<7f4a1c98>] (br_add_if+0x178/0x4c8 [bridge])
[ 5.506548] [<7f4a1c98>] (br_add_if [bridge]) from [<7f4a2af0>] (add_del_if+0x60/0x7c [bridge])
[ 5.506649] [<7f4a2af0>] (add_del_if [bridge]) from [<7f4a34c0>] (br_dev_ioctl+0x68/0x6c [bridge])
[ 5.506729] [<7f4a34c0>] (br_dev_ioctl [bridge]) from [<80653300>] (dev_ifsioc+0x2c4/0x2fc)
[ 5.506747] [<80653300>] (dev_ifsioc) from [<80653720>] (dev_ioctl+0x36c/0x858)
[ 5.506765] [<80653720>] (dev_ioctl) from [<80616aa8>] (sock_ioctl+0x200/0x2ac)
[ 5.506784] [<80616aa8>] (sock_ioctl) from [<80283f68>] (do_vfs_ioctl+0xac/0x820)
[ 5.506801] [<80283f68>] (do_vfs_ioctl) from [<80284720>] (SyS_ioctl+0x44/0x6c)
[ 5.506819] [<80284720>] (SyS_ioctl) from [<80108220>] (__sys_trace_return+0x0/0x10)
[ 5.506831] Code: e92dd800 e24cb004 e52de004 e8bd4000 (e59021f0)
[ 5.506922] ---[ end trace a6824d7f1c5a36d1 ]---
(full console output attached as startup.txt)
startup.txt
After the Oops Raspbian continues to boot but after many minutes doesn't get to the login prompt.
When the same SD card is used in a Pi3 (none +) it starts correctly and adds eth0 to br0.
To replicate - I'm using a fresh 2018-03-13-raspbian-stretch-lite.img with the following changes.
Add "enable_uart=1" to the end of /boot/config.txt
Boot & login
sudo apt-get update
sudo apt-get -y upgrade
sudo apt-get -y install bridge-utils
sudo cat << EOF | sudo tee -a /etc/network/interfaces
auto br0
iface br0 inet manual
bridge_ports eth0
bridge_stp off
bridge_waitport 0
bridge_fd 0
EOF
echo "denyinterfaces eth0" | sudo tee -a /etc/dhcpcd.conf
sudo reboot
On boot I get the Oops above.