Messages in this thread | | | From | Bart Van Assche <> | Subject | Re: Regression in 4.11 - PowerPC crashes on boot, bisected to commit 5657933dbb6e | Date | Thu, 2 Mar 2017 05:22:14 +0000 |
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On Thu, 2017-03-02 at 16:14 +1100, Benjamin Herrenschmidt wrote: > On Wed, 2017-03-01 at 21:26 -0600, Larry Finger wrote: > > My Powerbook G4 Aluminum generates a fatal splat early in the boot process, just > > after identifying the driver for the disk. Unfortunately, it turns off almost > > immediately, thus I cannot report the message. After this bug has been > > triggered, the system clock has been reset to Dec. 31, 1969. I assume this is a > > side effect of an uncontrolled DMA operation. > > > > This problem has been bisected to commit 5657933dbb6e ("treewide: Move dma_ops > > from struct dev_archdata into struct device"). > > Side effect of a crash during boot... the PMU gets upset when we crash while > there's a request in flight, that's probably what is happening. > > As to why that commit is broken, I don't have time to look into it right now, > maybe next week of nobody beats me to it.
Hello Ben,
Thanks. I will try to reproduce what has been reported with qemu-ppc on Friday to double check that it's really commit 5657933dbb6e that is causing this. I reread it but couldn't find any reason why it works on x86-64 but not on powerpc. BTW, the following patch is needed on at least s390 but probably also on powerpc to restore InfiniBand support: http://marc.info/?l=linux-rdma&m=148823342415501&w=2. This is why I asked for the kernel config.
Bart. | |