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SubjectRe: [GIT] Networking
This pull request completely breaks Intel wireless for me.

This is my trusty old XPS 13 (9350), using Intel Wireless 8260 (rev 3a).

That remains a very standard Intel machine with absolutely zero odd
things going on.

The firmware is iwlwifi-8000C-28.ucode from
iwl7260-firmware-25.30.13.0-75.fc26.noarch, and the kernel reports

iwlwifi 0000:3a:00.0: loaded firmware version 27.455470.0 op_mode iwlmvm

the thing starts acting badly with this:

iwlwifi 0000:3a:00.0: FW Error notification: type 0x00000000 cmd_id 0x04
iwlwifi 0000:3a:00.0: FW Error notification: seq 0x0000 service 0x00000004
iwlwifi 0000:3a:00.0: FW Error notification: timestamp 0x 5D84
iwlwifi 0000:3a:00.0: Microcode SW error detected. Restarting 0x2000000.
iwlwifi 0000:3a:00.0: Start IWL Error Log Dump:
iwlwifi 0000:3a:00.0: Status: 0x00000100, count: 6
iwlwifi 0000:3a:00.0: Loaded firmware version: 27.455470.0
iwlwifi 0000:3a:00.0: 0x00000038 | BAD_COMMAND
iwlwifi 0000:3a:00.0: 0x00A002F0 | trm_hw_status0
...
iwlwifi 0000:3a:00.0: 0x00000000 | isr status reg
ieee80211 phy0: Hardware restart was requested
iwlwifi 0000:3a:00.0: FW error in SYNC CMD MAC_CONTEXT_CMD
CPU: 2 PID: 993 Comm: NetworkManager Not tainted 4.13.0-06466-g80cee03bf1d6 #4
Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.4.17 05/10/2017
Call Trace:
dump_stack+0x4d/0x70
iwl_trans_pcie_send_hcmd+0x4e7/0x530 [iwlwifi]
? wait_woken+0x80/0x80
iwl_trans_send_cmd+0x5c/0xc0 [iwlwifi]
iwl_mvm_send_cmd+0x32/0x90 [iwlmvm]
iwl_mvm_send_cmd_pdu+0x58/0x80 [iwlmvm]
iwl_mvm_mac_ctxt_send_cmd+0x2a/0x60 [iwlmvm]
? iwl_mvm_mac_ctxt_send_cmd+0x2a/0x60 [iwlmvm]
iwl_mvm_mac_ctxt_cmd_sta+0x140/0x1e0 [iwlmvm]
iwl_mvm_mac_ctx_send+0x2d/0x60 [iwlmvm]
iwl_mvm_mac_ctxt_add+0x43/0xc0 [iwlmvm]
iwl_mvm_mac_add_interface+0x139/0x2b0 [iwlmvm]
? iwl_led_brightness_set+0x1f/0x30 [iwlmvm]
drv_add_interface+0x4a/0x120 [mac80211]
ieee80211_do_open+0x33d/0x820 [mac80211]
ieee80211_open+0x52/0x60 [mac80211]
__dev_open+0xae/0x120
__dev_change_flags+0x17b/0x1c0
dev_change_flags+0x29/0x60
do_setlink+0x2f7/0xe60
? __nla_put+0x20/0x30
? _raw_read_unlock_bh+0x20/0x30
? inet6_fill_ifla6_attrs+0x4be/0x4e0
? __kmalloc_node_track_caller+0x35/0x2b0
? nla_parse+0x35/0x100
rtnl_newlink+0x5d2/0x8f0
? __netlink_sendskb+0x3b/0x60
? security_capset+0x40/0x80
? ns_capable_common+0x68/0x80
? ns_capable+0x13/0x20
rtnetlink_rcv_msg+0x1f9/0x280
? rtnl_calcit.isra.26+0x110/0x110
netlink_rcv_skb+0x8e/0x130
rtnetlink_rcv+0x15/0x20
netlink_unicast+0x18b/0x220
netlink_sendmsg+0x2ad/0x3a0
sock_sendmsg+0x38/0x50
___sys_sendmsg+0x269/0x2c0
? addrconf_sysctl_forward+0x114/0x280
? dev_forward_change+0x140/0x140
? sysctl_head_finish.part.22+0x32/0x40
? lockref_put_or_lock+0x5e/0x80
? dput.part.22+0x13e/0x1c0
? mntput+0x24/0x40
__sys_sendmsg+0x54/0x90
? __sys_sendmsg+0x54/0x90
SyS_sendmsg+0x12/0x20
entry_SYSCALL_64_fastpath+0x13/0x94
RIP: 0033:0x7ff1f9933134
RSP: 002b:00007ffe7419b460 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000055604b6d82b9 RCX: 00007ff1f9933134
RDX: 0000000000000000 RSI: 00007ffe7419b4b0 RDI: 0000000000000007
RBP: 00007ffe7419b940 R08: 0000000000000000 R09: 000055604d16b400
R10: 00007ff1f7cf8b38 R11: 0000000000000293 R12: 0000000000000001
R13: 0000000000000001 R14: 00007ffe7419b670 R15: 000055604b9515a0
iwlwifi 0000:3a:00.0: Failed to send MAC context (action:1): -5

and it doesn't get any better from there. The next error seems to be

Timeout waiting for hardware access (CSR_GP_CNTRL 0x08000008)
------------[ cut here ]------------
WARNING: CPU: 3 PID: 1075 at
drivers/net/wireless/intel/iwlwifi/pcie/trans.c:1874
iwl_trans_pcie_grab_nic_access+0xdf/0xf0 [iwlwifi]

and it will continue with those microcode failure errors and various
other warnigns about how nothing is working.

And no, nothing works. A lot of log output, no actual network access..

Linus

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