Messages in this thread | | | Subject | Re: PPC476 hangs during tlb flush after calling /init in crash kernel with linux 5.4+ | From | Christophe Leroy <> | Date | Tue, 27 Apr 2021 19:26:07 +0200 |
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Hi Eddies,
Le 27/04/2021 à 19:03, Eddie James a écrit : > Hi all, > > I'm having a problem in simulation and hardware where my PPC476 > processor stops executing instructions after callling /init. In my case > this is a bash script. The code descends to flush the TLB, and > somewhere in the loop in _tlbil_pid, the PC goes to > InstructionTLBError47x but does not go any further. This only occurs in > the crash kernel environment, which is using the same kernel, > initramfs, and init script as the main kernel, which executed fine. I > do not see this problem with linux 4.19 or 3.10. I do see it with 5.4 > and 5.10. I see a fair amount of refactoring in the PPC memory > management area between 4.19 and 5.4. Can anyone point me in a > direction to debug this further? My stack trace is below as I can run > gdb in simulation.
Can you bisect to pin point the culprit commit ?
Assuming the problem is in arch/powerpc/ , you should get the result in approx 10 steps:
[root@po15610vm linux-powerpc]# git bisect start -- arch/powerpc/ [root@po15610vm linux-powerpc]# git bisect bad v5.4 [root@po15610vm linux-powerpc]# git bisect good v4.19 Bisecting: 964 revisions left to test after this (roughly 10 steps)
Christophe
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