Messages in this thread | | | Date | Thu, 22 Aug 2019 10:57:40 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: Regression in 5.3-rc1 and later |
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Chris,
On Thu, 22 Aug 2019, Chris Clayton wrote:
Trimmed cc list
> I've found a problem that isn't present in 5.2 series or 4.19 series > kernels, and seems to have arrived in 5.3-rc1. The problem is that if I > suspend (to ram) my laptop, on resume 14 minutes or more after > suspending, I have no networking functionality. If I resume the laptop > after 13 minutes or less, networking works fine. I haven't tried to get > finer grained timings between 13 and 14 minutes, but can do if it would > help. > > ifconfig shows that wlan0 is still up and still has its assigned ip > address but, for instance, a ping of any other device on my network, > fails as does pinging, say, kernel.org. I've tried "downing" the network > with (/sbin/ifdown) and unloading the iwlmvm module and then reloading > the module and "upping" (/sbin/ifup) the network, but my network is still > unusable. I should add that the problem also manifests if I hibernate the > laptop, although my testing of this has been minimal. I can do more if > required.
What happens if you restart the network manager and/or wpa_supplicant or whatever your distro uses for that.
> As I say, the problem first appears in 5.3-rc1, so I've bisected between > 5.2.0 and 5.3-rc1 and that concluded with:
Just for confirmation, it's still broken as of 5.3-rc5, right? We had fixes post rc1.
> x86/vdso: Switch to generic vDSO implementation
> To confirm my bisection was correct, I did a git checkout of > 7ac8707479886c75f353bfb6a8273f423cfccb2. As expected, the kernel > exhibited the problem I've described. However, a kernel built at the > immediately preceding (parent?) commit > (bfe801ebe84f42b4666d3f0adde90f504d56e35b) has a working network after a > (>= 14minute) suspend/resume cycle.
~14 minutes is odd. I can't come up with anything which rolls over, wraps or overflows at that point.
Can you please provide the output of:
dmesg | grep -i TSC
Thanks,
tglx
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