Hi, I get the below crash on OCTEON (with octeon_mgmt interface, genphy) always during systemd boot.
Bisected to: commit a9049e0c513c4521dbfaa302af8ed08b3366b41f Author: Andrew Lunn <and...@lunn.ch> Date: Wed Jan 6 20:11:26 2016 +0100 mdio: Add support for mdio drivers. [ 250.179887] CPU 2 Unable to handle kernel paging request at virtual address 0000000000000000, epc == ffffffff81637bac, ra == ffffffff81637b7c [ 250.218161] Oops[#1]: [ 250.224970] CPU: 2 PID: 850 Comm: systemd-network Not tainted 4.5.0-rc1-octeon-distro.git-test #1 [ 250.251569] task: 8000000031188000 ti: 800000002f8e8000 task.ti: 800000002f8e8000 [ 250.251586] $ 0 : 0000000000000000 ffffffff81639774 0000000000000000 ffffffffffffffff [ 250.251595] $ 4 : 0000000000000000 0000000000000000 ffffffff81740000 0000000000000001 [ 250.251604] $ 8 : 0000000000000001 0000000000000000 ffffffff81106100 0000000100000001 [ 250.251613] $12 : 0000000000000000 ffffffff813eb81c ffffffff8150be18 0000000000000000 [ 250.251622] $16 : 8000000031290fc0 ffffffffffffffff 8000000031290fc4 8000000031188000 [ 250.251631] $20 : 0000000000000002 0000000000000001 8000000031290fc8 800000002f8eba40 [ 250.251640] $24 : 0000000000000038 ffffffff81105fb0 [ 250.251649] $28 : 800000002f8e8000 800000002f8eb740 000000fff7857f88 ffffffff81637b7c [ 250.251651] Hi : 431bde82d7b50717 [ 250.251653] Lo : c8de2ac3222855ea [ 250.251668] epc : ffffffff81637bac __mutex_lock_slowpath+0x7c/0x190 [ 250.251675] ra : ffffffff81637b7c __mutex_lock_slowpath+0x4c/0x190 [ 250.251684] Status: 10108ce3 KX SX UX KERNEL EXL IE [ 250.251686] Cause : 0080000c (ExcCode 03) [ 250.251688] BadVA : 0000000000000000 [ 250.251690] PrId : 000d0409 (Cavium Octeon+) [ 250.251699] Modules linked in: pata_octeon_cf libata autofs4 [ 250.251704] Process systemd-network (pid: 850, threadinfo=800000002f8e8000, task=8000000031188000, tls=000000fff75ba700) [ 250.251782] Stack : 8000000031290fc8 0000000000000000 0000000000000001 8000000003f9bca0 [ 250.251782] 8000000031290c00 ffffffff81856558 8000000031290fc0 8000000031225000 [ 250.251782] 0000000000000001 0000000000000000 8000000031008800 ffffffff814b6284 [ 250.251782] ffffffff81639774 ffffffff81175dc4 8000000031290c00 ffffffff814baf80 [ 250.251782] 8000000031210000 ffffffff814b64ac 800000002f8eb810 800000002f8eb810 [ 250.251782] ffffffff814f7790 8000000031290c00 ffffffff814baf80 ffffffff814baf80 [ 250.251782] 8000000031225000 0000000000000000 800000003290ca10 ffffffff814b66a4 [ 250.251782] 8000000031225000 8000000031290c00 0000000000000001 ffffffff814f7b80 [ 250.251782] 8000000031225000 8000000031225788 8000000031225830 0000000000001002 [ 250.251782] 800000002f8ebb80 ffffffff814ba81c 8000000fb7105c32 ffffffff8116aab4 [ 250.251782] ... [ 250.251784] Call Trace: [ 250.251791] [<ffffffff81637bac>] __mutex_lock_slowpath+0x7c/0x190 [ 250.251801] [<ffffffff814b6284>] phy_probe+0x6c/0x120 [ 250.251807] [<ffffffff814b64ac>] phy_attach_direct+0xdc/0x1a8 [ 250.251814] [<ffffffff814b66a4>] phy_connect_direct+0x2c/0x98 [ 250.251822] [<ffffffff814f7b80>] of_phy_connect+0x60/0xb8 [ 250.251830] [<ffffffff814ba81c>] octeon_mgmt_open+0x36c/0xad0 [ 250.251838] [<ffffffff81531444>] __dev_open+0x11c/0x1b0 [ 250.251844] [<ffffffff815317b0>] __dev_change_flags+0xa0/0x188 [ 250.251850] [<ffffffff815318c8>] dev_change_flags+0x30/0x78 [ 250.251856] [<ffffffff81543b7c>] do_setlink+0x374/0xa38 [ 250.251862] [<ffffffff8154431c>] rtnl_setlink+0xdc/0x120 [ 250.251868] [<ffffffff81542f6c>] rtnetlink_rcv_msg+0xac/0x2a0 [ 250.251875] [<ffffffff8155f210>] netlink_rcv_skb+0xf0/0x120 [ 250.251880] [<ffffffff81542eb0>] rtnetlink_rcv+0x38/0x48 [ 250.251886] [<ffffffff8155e850>] netlink_unicast+0x1c0/0x2d8 [ 250.251891] [<ffffffff8155eefc>] netlink_sendmsg+0x424/0x480 [ 250.251898] [<ffffffff81509cbc>] sock_sendmsg+0x24/0x40 [ 250.251904] [<ffffffff8150bedc>] SyS_sendto+0xc4/0x108 [ 250.251914] [<ffffffff8112de90>] syscall_common+0x34/0x58 [ 250.251918] [ 250.251936] [ 250.251936] Code: 24150001 ffa20008 24140002 <fc5d0000> 0858def5 ffb30010 fe740000 0c58e612 0240202d [ 250.251983] ---[ end trace 1be6b781dce6d4dc ]--- A.