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SubjectRe: [PATCH 0/3 (RFC)](memory hotplug) freeing pages allocated by bootmem for hotremove
> 
> Do you have any updates to this. I am getting following boot panic while
> testing this. Before I debug it, I want to make sure its not already
> fixed. Please let me know.

Hmmmm. No, I don't. Could you debug it?
This may come from powerpc environment.

Thanks.


>
> Thanks,
> Badari
>
> Linux version 2.6.25-rc5-mm1 (root@elm3b155) (gcc version 3.3.3 (SuSE Linux)) #2 SMP Fri Mar 21 07:48:29 PST 2008
> [boot]0012 Setup Arch
> NUMA associativity depth for CPU/Memory: 3
> adding cpu 0 to node 0
> node 0
> NODE_DATA() = c000000071fea100
> start_paddr = 0
> end_paddr = 72000000
> bootmap_paddr = 71fdb000
> reserve_bootmem 0 7cc000
> reserve_bootmem 23d0000 10000
> reserve_bootmem 77b6000 84a000
> reserve_bootmem 71fdb000 f000
> reserve_bootmem 71fea100 1e00
> reserve_bootmem 71febf68 14098
> PCI host bridge /pci@800000020000002 ranges:
> IO 0x000003fe00200000..0x000003fe002fffff -> 0x0000000000000000
> MEM 0x0000040080000000..0x00000400bfffffff -> 0x00000000c0000000
> PCI host bridge /pci@800000020000003 ranges:
> IO 0x000003fe00700000..0x000003fe007fffff -> 0x0000000000000000
> MEM 0x00000401c0000000..0x00000401ffffffff -> 0x00000000c0000000
> EEH: PCI Enhanced I/O Error Handling Enabled
> PPC64 nvram contains 7168 bytes
> Zone PFN ranges:
> DMA 0 -> 466944
> Normal 466944 -> 466944
> Movable zone start PFN for each node
> Node 0: 262144
> early_node_map[1] active PFN ranges
> 0: 0 -> 466944
> [boot]0015 Setup Done
> Built 1 zonelists in Node order, mobility grouping on. Total pages: 451440
> Policy zone: DMA
> Kernel command line: root=/dev/sda3 selinux=0 elevator=cfq numa=debug kernelcore=1024M
> [boot]0020 XICS Init
> [boot]0021 XICS Done
> PID hash table entries: 4096 (order: 12, 32768 bytes)
> clocksource: timebase mult[1352e86] shift[22] registered
> Console: colour dummy device 80x25
> console handover: boot [udbg-1] -> real [hvc0]
> Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes)
> Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes)
> freeing bootmem node 0
> Unable to handle kernel paging request for data at address 0xcf7f80000000000c
> Faulting instruction address: 0xc0000000000ce3e8
> Oops: Kernel access of bad area, sig: 11 [#1]
> SMP NR_CPUS=32 NUMA pSeries
> Modules linked in:
> NIP: c0000000000ce3e8 LR: c0000000000cf714 CTR: 800000000013f270
> REGS: c0000000007639f0 TRAP: 0300 Not tainted (2.6.25-rc5-mm1)
> MSR: 8000000000009032 <EE,ME,IR,DR> CR: 44002022 XER: 00000008
> DAR: cf7f80000000000c, DSISR: 0000000042010000
> TASK = c000000000689910[0] 'swapper' THREAD: c000000000760000 CPU: 0
> GPR00: fffffffffffffffd c000000000763c70 c000000000761be0 0000000000000000
> GPR04: cf7f800000000000 0000000000000000 0000000000000000 0000000000000001
> GPR08: 0000000000000000 fffffffffffffffe 0000000000000088 cf00000000000000
> GPR12: 0000000000004000 c00000000068a380 0000000000000000 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 4000000001c00000 0000000000000000 0000000002241ed8 0000000000000000
> GPR24: 0000000002242148 0000000000000000 c000000071feb000 0000000000000000
> GPR28: c000000071feb000 0000000000000001 c0000000006e2bd8 cf7f800000000000
> NIP [c0000000000ce3e8] .set_page_bootmem_info+0x10/0x38
> LR [c0000000000cf714] .register_page_bootmem_info_section+0xc4/0x17c
> Call Trace:
> [c000000000763c70] [000000000000001a] 0x1a (unreliable)
> [c000000000763d10] [c0000000000cf8f0] .register_page_bootmem_info_node+0x124/0x158
> [c000000000763dc0] [c0000000006290e4] .free_all_bootmem_node+0x1c/0x3c
> [c000000000763e50] [c00000000061d618] .mem_init+0xbc/0x260
> [c000000000763ee0] [c00000000060bbcc] .start_kernel+0x2f4/0x3f4
> [c000000000763f90] [c000000000008594] .start_here_common+0x54/0xc0
> Instruction dump:
> eb61ffd8 eb81ffe0 eba1ffe8 7c0803a6 ebc1fff0 ebe1fff8 7d808120 4e800020
> 2fa50000 3920fffe 3800fffd 409e000c <9124000c> 48000008 9004000c 38000800
> ---[ end trace 31fd0ba7d8756001 ]---
> Kernel panic - not syncing: Attempted to kill the idle task!
>
>

--
Yasunori Goto




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