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SubjectEarly boot panic on machine with lots of memory
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Hi all,

I'm seeing the following when booting a KVM guest with 65gb of RAM, on latest linux-next.

Note that it happens with numa=off.

[ 0.000000] BUG: unable to handle kernel paging request at ffff88102febd948
[ 0.000000] IP: [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
[ 0.000000] PGD 4826063 PUD cf67a067 PMD cf7fa067 PTE 800000102febd160
[ 0.000000] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
[ 0.000000] CPU 0
[ 0.000000] Pid: 0, comm: swapper Not tainted 3.5.0-rc2-next-20120612-sasha-00015-g996227e #395
[ 0.000000] RIP: 0010:[<ffffffff836a6f37>] [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
[ 0.000000] RSP: 0000:ffffffff84801db8 EFLAGS: 00010006
[ 0.000000] RAX: 0000000000000109 RBX: 000000000000011a RCX: 0000000000000000
[ 0.000000] RDX: 0000000000000109 RSI: 0000000000000400 RDI: ffffffff84801e60
[ 0.000000] RBP: ffffffff84801e18 R08: ffff88102febd958 R09: 0000000100000000
[ 0.000000] R10: 0000001030000000 R11: 0000000000000119 R12: ffff88102febc080
[ 0.000000] R13: ffffffff84e1beb0 R14: 0000000000000000 R15: 0000000000000002
[ 0.000000] FS: 0000000000000000(0000) GS:ffff880fcfa00000(0000) knlGS:0000000000000000
[ 0.000000] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 0.000000] CR2: ffff88102febd948 CR3: 0000000004825000 CR4: 00000000000006b0
[ 0.000000] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 0.000000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 0.000000] Process swapper (pid: 0, threadinfo ffffffff84800000, task ffffffff8482d400)
[ 0.000000] Stack:
[ 0.000000] 0000000000000000 ffffffff84801e68 ffffffff84801e70 ffffffff84801e60
[ 0.000000] ffffffff84e1be80 0000000000000003 0000010900000002 0000000000f9122f
[ 0.000000] ffffffff84801e60 ffffffff84801e70 ffffffff84801e68 ffffea0000000000
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff850e8a98>] free_low_memory_core_early+0x1e4/0x206
[ 0.000000] [<ffffffff850dab50>] numa_free_all_bootmem+0x82/0x8e
[ 0.000000] [<ffffffff836b4352>] ? bad_to_user+0x149c/0x149c
[ 0.000000] [<ffffffff850d8ff9>] mem_init+0x1e/0xec
[ 0.000000] [<ffffffff850c0eb9>] start_kernel+0x209/0x3e9
[ 0.000000] [<ffffffff850c0ade>] ? kernel_init+0x28a/0x28a
[ 0.000000] [<ffffffff850c0324>] x86_64_start_reservations+0xff/0x104
[ 0.000000] [<ffffffff850c047e>] x86_64_start_kernel+0x155/0x164
[ 0.000000] Code: 55 08 81 fe 00 04 00 00 0f 84 9a 00 00 00 41 3b 75 10 0f 85 9c 00 00 00 e9 8b 00 00 00 4c 6b c0 18 31 c9 4f 8d 04 04 85 d2 74 08 <49> 8b 48 f0 49 03 48 e8 48 83 cf ff 4c 39 d8 73 03 49 8b 38 4c
[ 0.000000] RIP [<ffffffff836a6f37>] __next_free_mem_range+0x9b/0x155
[ 0.000000] RSP <ffffffff84801db8>
[ 0.000000] CR2: ffff88102febd948
[ 0.000000] ---[ end trace a7919e7f17c0a725 ]---



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