On Fri, 25 May 2007 22:21:56 +1000 npiggin@xxxxxxx wrote:
> These are intended to replace prepare_write and commit_write with more
> flexible alternatives that are also able to avoid the buffered write
> deadlock problems efficiently (which prepare_write is unable to do).
It doesn't like LTP's vmsplice01:
------------[ cut here ]------------
kernel BUG at fs/buffer.c:1829!
invalid opcode: 0000 [#1]
SMP
Modules linked in:
CPU: 0
EIP: 0060:[<c01a2938>] Not tainted VLI
EFLAGS: 00010206 (2.6.22-rc3-mm1 #1)
EIP is at __block_prepare_write+0x348/0x360
eax: 4000081d ebx: c176f10c ecx: 000001f0 edx: c176f10c
esi: df877670 edi: deeae3f0 ebp: de89fdc0 esp: de89fd60
ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
Process vmsplice01 (pid: 15759, ti=de89e000 task=c3ac1100 task.ti=de89e000)
Stack: c0140083 de89fd7c 00000046 00000000 c2fffe20 000001f0 c176f10c deeae3f0
c017c982 c01ee9b7 df877668 c01ee9b7 df877670 c345f300 df877684 de89fdcc
c01ee9eb c176f10c de89fdc4 c015c7ee deeae504 c176f10c df877670 deeae3f0
Call Trace:
[<c0103e1a>] show_trace_log_lvl+0x1a/0x30
[<c0103ed8>] show_stack_log_lvl+0xa8/0xe0
[<c01040f9>] show_registers+0x1e9/0x2f0
[<c010430f>] die+0x10f/0x240
[<c01044d1>] do_trap+0x91/0xc0
[<c0104889>] do_invalid_op+0x89/0xa0
[<c03f44ca>] error_code+0x72/0x78
[<c01a29d9>] block_write_begin+0x49/0xd0
[<c01c9a27>] ext3_write_begin+0xb7/0x190
[<c015e77f>] pagecache_write_begin+0x4f/0x150
[<c019f02b>] pipe_to_file+0x8b/0x140
[<c019ea00>] __splice_from_pipe+0x70/0x250
[<c019ec28>] splice_from_pipe+0x48/0x70
[<c019eef4>] generic_file_splice_write+0x54/0x100
[<c019e91f>] do_splice_from+0x5f/0x80
[<c019fd84>] sys_splice+0x164/0x200
[<c0102d8e>] sysenter_past_esp+0x5f/0x99
=======================
INFO: lockdep is turned off.
Code: 49 c0 89 44 24 0c 89 7c 24 08 89 5c 24 04 c7 04 24 ac 2a 49 c0 e8 e9 ff f7 ff e8 b4 21 f6 ff 8b 4d f0 e9 a6 fe ff ff 0f 0b eb fe <0f> 0b eb fe 8d 74 26 00 0f 0b eb fe 0f 0b eb fe 90 8d b4 26 00
EIP: [<c01a2938>] __block_prepare_write+0x348/0x360 SS:ESP 0068:de89fd60
That's
BUG_ON(to > PAGE_CACHE_SIZE);
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