[Intel-wired-lan] igc driver causes suspend to fail if powersave is enabled

[Neftin, Sasha]

On 3/15/2023 09:20, Srikar Dronamraju wrote:
> Hi,
> 
> On Lenovo ThinkPad P15 Gen 2i with I225-LM Ethernet card running Fedora 37
> kernel 6.1.13-200.fc37.x86_64, running powertop --auto-tune causes suspend
> and reboot to fail. Once suspend fails, networking stops working even for
> wireless. Infact as a normal user, I cant even start a sudo session after
> trying to suspend.
Hello,
Is the i225 card on board (under PCH downstream port) or connected via 
thunderbolt?
Did you see the same problem on other platforms?
I will forward this inquiry to our PAE.>
> Reboot/shutdown fails since Network-Manager cant be killed. (More below)
> The only option left is for the system to be hard-reboot.
> 
> I finally found that the problem was because enabling auto or powersave on
> ethernet card was causing this issue. i.e
> 
> echo 'auto' > '/sys/bus/pci/devices/0000:0b:00.0/power/control'
> 
> Pls do note, I was not using ethernet, I was just using wireless even before
> suspend.
> 
> lspci -v reports
> 0b:00.0 Ethernet controller: Intel Corporation Ethernet Controller I225-LM (rev 03)
> 	Subsystem: Lenovo Device 22d8
> 	Flags: fast devsel, IRQ 16, IOMMU group 17
> 	Memory at be300000 (32-bit, non-prefetchable) [size=1M]
> 	Memory at be400000 (32-bit, non-prefetchable) [size=16K]
> 	Capabilities: [40] Power Management version 3
> 	Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
> 	Capabilities: [70] MSI-X: Enable- Count=5 Masked-
> 	Capabilities: [a0] Express Endpoint, MSI 00
> 	Capabilities: [100] Advanced Error Reporting
> 	Capabilities: [140] Device Serial Number 88-a4-c2-ff-ff-5f-09-88
> 	Capabilities: [1c0] Latency Tolerance Reporting
> 	Capabilities: [1f0] Precision Time Measurement
> 	Capabilities: [1e0] L1 PM Substates
> 	Kernel modules: igc
> 
> When suspend fails, we see messages like this
> 
> kernel: Freezing of tasks failed after 20.001 seconds (3 tasks refusing to freeze, wq_busy=0):
> kernel: task:NetworkManager  state:D stack:0     pid:2014  ppid:1      flags:0x00004006
> kernel: Call Trace:
> kernel:  <TASK>
> kernel:  __schedule+0x35f/0x1360
> kernel:  ? asm_sysvec_reschedule_ipi+0x16/0x20
> kernel:  schedule+0x5d/0xe0
> kernel:  schedule_preempt_disabled+0x14/0x30
> kernel:  __mutex_lock.constprop.0+0x390/0x6e0
> kernel:  ? __cond_resched+0x1c/0x30
> kernel:  igc_resume+0xfc/0x1d0 [igc]
> kernel:  ? pci_pm_restore_noirq+0xc0/0xc0
> kernel:  __rpm_callback+0x41/0x170
> kernel:  rpm_callback+0x35/0x70
> kernel:  ? pci_pm_restore_noirq+0xc0/0xc0
> kernel:  rpm_resume+0x5bb/0x800
> kernel:  __pm_runtime_resume+0x47/0x80
> kernel:  dev_ethtool+0x124/0x2eb0
> kernel:  ? avc_has_extended_perms+0x22a/0x520
> kernel:  ? inet_ioctl+0xd8/0x1e0
> kernel:  dev_ioctl+0x156/0x520
> kernel:  sock_do_ioctl+0xda/0x120
> kernel:  sock_ioctl+0xed/0x330
> kernel:  ? security_file_ioctl+0x39/0x60
> kernel:  __x64_sys_ioctl+0x8d/0xd0
> kernel:  do_syscall_64+0x58/0x80
> kernel:  ? __x64_sys_ioctl+0xa8/0xd0
> kernel:  ? syscall_exit_to_user_mode+0x17/0x40
> kernel:  ? do_syscall_64+0x67/0x80
> kernel:  ? do_syscall_64+0x67/0x80
> kernel:  ? do_syscall_64+0x67/0x80
> kernel:  ? do_syscall_64+0x67/0x80
> kernel:  entry_SYSCALL_64_after_hwframe+0x63/0xcd
> kernel: RIP: 0033:0x7ff964b93d6f
> kernel: RSP: 002b:00007ffc96c6f540 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> kernel: RAX: ffffffffffffffda RBX: 00005608c0ba8040 RCX: 00007ff964b93d6f
> kernel: RDX: 00007ffc96c6f640 RSI: 0000000000008946 RDI: 000000000000001e
> kernel: RBP: 00007ffc96c6f7c0 R08: 0000000000000000 R09: 0000000000000000
> kernel: R10: 0000000000000021 R11: 0000000000000246 R12: 0000000000000000
> kernel: R13: 00007ffc96c6f640 R14: 00007ffc96c6f620 R15: 00007ffc96c6f620
> kernel:  </TASK>
> 
> We have seen similar problems even with people running other distros like
> Arch Linux and RHEL 8 (which is 4.18 based)distros. So this is not distro
> specific or kernel specific too.
> 
> Even installing tlp package from https://linrunner.de/tlp/index.html causes
> similar issues.
>