Re: bisected boot regression post 2.6.25-rc3.. please revert

[Arjan van de Ven]

Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxx> wrote:
>
> > Could you try to hack up a debug patch perhaps? Uninline the 
> > fucntion(s) then add two versions (one is that breaks on your box and 
> > one is that works on your box) of this same pmd_bad()/pud_bad() 
> > functions and do something like this (pseudocode):
>
> i.e. something like the (tested) patch below. It is not clear whether 
> your testcase is on 32-bit or 64-bit - so i went for the more likely 
> 32-bit case first.


------------[ cut here ]------------
WARNING: at arch/x86/mm/pgtable_32.c:387 pmd_bad+0x44/0x53()
Modules linked in:
Pid: 1, comm: swapper Not tainted 2.6.25-rc3 #14
 [<c0424ba5>] warn_on_slowpath+0x41/0x67
 [<c0408c5c>] ? native_sched_clock+0x94/0xa6
 [<c043f432>] ? lock_release_holdtime+0x1a/0x115
 [<c04702d4>] ? handle_mm_fault+0x297/0x7e2
 [<c063eee6>] ? _spin_unlock+0x1d/0x20
 [<c04707f0>] ? handle_mm_fault+0x7b3/0x7e2
 [<c04851c1>] ? do_sync_read+0xab/0xe9
 [<c0417223>] pmd_bad+0x44/0x53
 [<c046f37f>] follow_page+0x8b/0x1f2
 [<c0470aa0>] get_user_pages+0x281/0x2ef
 [<c0488dec>] get_arg_page+0x2d/0x79
 [<c04f63cd>] ? strnlen_user+0x2f/0x4d
 [<c0488efb>] copy_strings+0xc3/0x160
 [<c0488fb4>] copy_strings_kernel+0x1c/0x2b
 [<c048a109>] do_execve+0x11a/0x1f0
 [<c0403351>] sys_execve+0x29/0x51
 [<c0404ac6>] syscall_call+0x7/0xb
 [<c0407697>] ? kernel_execve+0x17/0x1c
 [<c04021d1>] ? _stext+0x69/0x12c
 [<c040574f>] ? kernel_thread_helper+0x7/0x10
 =======================
---[ end trace 63b854b89f6f375d ]---



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