The regression is still present in 4.13-rc5+git - can I do something to
help solving it?
Nothing about CPUs in boot args. Just CONFIG_NR_CPUS=32 in .config.
lscpu tells the CPU numbers are like this:
On-line CPU(s) list: 6,7,18,19
> > I (sort of) revived my E3500. TODC batteries are empty but I programmed
> > new nvram contents and started it up. Last it ran probably 4.1, 4.2 had
> > some blk-mq trouble. Updated to 4.9-rc6+git and got a boot crash.
>
> Finished bisecting. The bug crept in right before 4.8.0. E3500 has
> sparse CPU numbering, maybe this was not considered in the patch?
>
> commit 9b2f753ec23710aa32c0d837d2499db92fe9115b
> Author: Atish Patra <atish.patra@xxxxxxxxxx>
> Date: Thu Sep 15 14:54:40 2016 -0600
>
> sparc64: Fix cpu_possible_mask if nr_cpus is set
>
> If kernel boot parameter nr_cpus is set, it should define the number
> of CPUs that can ever be available in the system i.e.
> cpu_possible_mask. setup_nr_cpu_ids() overrides the nr_cpu_ids based
> on the cpu_possible_mask during kernel initialization. If
> cpu_possible_mask is not set based on the nr_cpus value, earlier part
> of the kernel would be initialized using nr_cpus value leading to a
> kernel crash.
>
> Set cpu_possible_mask based on nr_cpus value. Thus setup_nr_cpu_ids()
> becomes redundant and does not corrupt nr_cpu_ids value.
>
> Signed-off-by: Atish Patra <atish.patra@xxxxxxxxxx>
> Reviewed-by: Bob Picco <bob.picco@xxxxxxxxxx>
> Reviewed-by: Vijay Kumar <vijay.ac.kumar@xxxxxxxxxx>
> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
>
> :040000 040000 cd7f09841a45d3187cebeafb48b5fe22c00688a7 5c3d6e50160bd00108ee95f40cdf83264e9f5139 M arch
>
>
> > Unable to handle kernel NULL pointer dereference
> > tsk->{mm,active_mm}->context = 0000000000000000
> > tsk->{mm,active_mm}->pgd = fffff80000402000
> > \|/ ____ \|/
> > "@'/ .. \`@"
> > /_| \__/ |_\
> > \__U_/
> > swapper(0): Oops [#1]
> > CPU: 6 PID: 0 Comm: swapper Not tainted 4.9.0-rc6-00124-gded9b5d #71
> > task: 0000000000a1ddc0 task.stack: 0000000000a0c000
> > TSTATE: 0000009980e01600 TPC: 00000000006c1f24 TNPC: 00000000006c1f28 Y: 00000016 Not tainted
> > TPC: <__list_add+0x4/0xe0>
> > g0: 000000000129e650 g1: 0000000000aa9f58 g2: 0000000000a574e0 g3: 000000000007e09f
> > g4: 0000000000a1ddc0 g5: 0000000000000000 g6: 0000000000a0c000 g7: 000000000007e09e
> > o0: 0000000000515f84 o1: fffff800ff3de000 o2: 000000000001e1c0 o3: 0000000000a0f968
> > o4: 0000000000000100 o5: 0000000000000200 sp: 0000000000a0f171 ret_pc: 00000000004a7d04
> > RPC: <trace_hardirqs_off+0x4/0x20>
> > l0: 000000000129ddb8 l1: 00000000009ad178 l2: 0000000000a32400 l3: 0000000000000001
> > l4: 0000000000a18338 l5: 0000000000000006 l6: 000000000129e000 l7: 000000000129e1d8
> > i0: 0000060001fe7ba0 i1: 0000000000aa9b70 i2: 0000000000000000 i3: 0000000000a1ddc0
> > i4: fffff800ff3de000 i5: 0000000000000000 i6: 0000000000a0f221 i7: 0000000000515ff0
> > I7: <free_hot_cold_page+0x130/0x1e0>
> > Call Trace:
> > [0000000000515ff0] free_hot_cold_page+0x130/0x1e0
> > [0000000000517f04] __free_pages+0x24/0x60
> > [0000000000a6ece0] __free_pages_bootmem+0xb0/0xc0
> > [0000000000a728f8] free_all_bootmem+0x11c/0x17c
> > [0000000000a68794] mem_init+0x20/0xb0
> > [0000000000a62818] start_kernel+0x208/0x41c
> > [0000000000a640fc] start_early_boot+0x274/0x284
> > [00000000008ca18c] tlb_fixup_done+0x4c/0x60
> > [0000000000000000] (null)
> > Disabling lock debugging due to kernel taint
> > Caller[0000000000515ff0]: free_hot_cold_page+0x130/0x1e0
> > Caller[0000000000517f04]: __free_pages+0x24/0x60
> > Caller[0000000000a6ece0]: __free_pages_bootmem+0xb0/0xc0
> > Caller[0000000000a728f8]: free_all_bootmem+0x11c/0x17c
> > Caller[0000000000a68794]: mem_init+0x20/0xb0
> > Caller[0000000000a62818]: start_kernel+0x208/0x41c
> > Caller[0000000000a640fc]: start_early_boot+0x274/0x284
> > Caller[00000000008ca18c]: tlb_fixup_done+0x4c/0x60
> > Caller[0000000000000000]: (null)
> > Instruction DUMP: 900a20ff
> > 01000000 9de3bf50
> > <d85ea008> 80a30019
> > 2268000b d85e4000
> > 11002751 15002751
> >
> > Kernel panic - not syncing: Attempted to kill the idle task!
> > Press Stop-A (L1-A) to return to the boot prom
> > ---[ end Kernel panic - not syncing: Attempted to kill the idle task!
> >
> >
>
>
--
Meelis Roos (mroos@xxxxxxxx)
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