From: Meelis Roos <mroos@xxxxxxxx>
Date: Wed, 23 Aug 2017 09:18:44 +0300 (EEST)
> 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
Atish please look into this.
>
>> > 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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