> 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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