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SubjectRe: [PATCH] nonlinear oddities
Date
Dave McCracken wrote:

>
> --On Thursday, March 06, 2003 19:14:47 +0000 Hugh Dickins
> <hugh@veritas.com> wrote:
>
>> Now I think about it more, install_page's SetPageAnon is not good at all.
>> That (unlocked) page may already be mapped into other vmas as a shared
>> file page, non-zero mapcount, we can't suddenly switch it to Anon
>> (pte_chained) without doing the work to handle that case.
>
> Ouch. You're right. I'll go stare at it for awhile and see if any
> solutions jump out at me. I suppose at worst I could write a function to
> convert an object page to use pte_chains, but it'd be nice if that weren't
> necessary.
>
> Dave McCracken

Does this look like the above happening?

Mar 8 18:44:31 oscar kernel: printing eip:
Mar 8 18:44:31 oscar kernel: c012a29c
Mar 8 18:44:31 oscar kernel: Oops: 0002
Mar 8 18:44:31 oscar kernel: CPU: 0
Mar 8 18:44:31 oscar kernel: EIP: 0060:[find_get_page+40/72] Not tainted
Mar 8 18:44:31 oscar kernel: EFLAGS: 00010206
Mar 8 18:44:31 oscar kernel: EIP is at find_get_page+0x28/0x48
Mar 8 18:44:31 oscar kernel: eax: 6e2f6572 ebx: d3c7e000 ecx: 00000000 edx: d88a2288
Mar 8 18:44:31 oscar kernel: esi: 6e2f6572 edi: 00000000 ebp: d3c7fe34 esp: d3c7fe2c
Mar 8 18:44:31 oscar kernel: ds: 007b es: 007b ss: 0068
Mar 8 18:44:31 oscar kernel: Process startkde (pid: 1514, threadinfo=d3c7e000 task=d9446720)
Mar 8 18:44:31 oscar kernel: Stack: d3c7fea0 00000000 d3c7fe60 c012a61b d74e3b68 00000000 d3c7fea0 00000000
Mar 8 18:44:31 oscar kernel: 00000000 00001000 00000000 00000000 d74e3ad4 d3c7feb0 c012ab3f d74e3b68
Mar 8 18:44:31 oscar kernel: d6b1366c d6b13620 d6b13640 d3c7fea0 c012a8c8 d3c7fed8 d6b13640 d6b13620
Mar 8 18:44:31 oscar kernel: Call Trace:
Mar 8 18:44:31 oscar kernel: [do_generic_mapping_read+119/804] do_generic_mapping_read+0x77/0x324
Mar 8 18:44:31 oscar kernel: [__generic_file_aio_read+379/408] __generic_file_aio_read+0x17b/0x198
Mar 8 18:44:31 oscar kernel: [file_read_actor+0/252] file_read_actor+0x0/0xfc
Mar 8 18:44:31 oscar kernel: [generic_file_read+127/156] generic_file_read+0x7f/0x9c
Mar 8 18:44:31 oscar kernel: [handle_mm_fault+107/292] handle_mm_fault+0x6b/0x124
Mar 8 18:44:31 oscar kernel: [do_page_fault+0/1029] do_page_fault+0x0/0x405
Mar 8 18:44:31 oscar kernel: [open_namei+726/1020] open_namei+0x2d6/0x3fc
Mar 8 18:44:31 oscar kernel: [dentry_open+231/480] dentry_open+0xe7/0x1e0
Mar 8 18:44:31 oscar kernel: [file_ioctl+331/352] file_ioctl+0x14b/0x160
Mar 8 18:44:31 oscar kernel: [vfs_read+171/336] vfs_read+0xab/0x150
Mar 8 18:44:31 oscar kernel: [sys_read+40/60] sys_read+0x28/0x3c
Mar 8 18:44:31 oscar kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Mar 8 18:44:31 oscar kernel:
Mar 8 18:44:31 oscar kernel: Code: ff 46 04 90 ff 4b 10 8b 43 08 a8 08 74 06 e8 19 96 fe ff 90

This was with 64-mm2 after stoping X, changing some font parms, and restarting it

Ed Tomlinson

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