Andrew Morton wrote:
On Sun, 10 Jun 2007 17:57:14 +0200 Eric Sesterhenn / Snakebyte <[email protected]> wrote:
hi,
i got the following BUG while running the syscalls.sh
from ltp-full-20070531 on an ext3 partition, it is easily reproducible
for me
[ 476.338068] ------------[ cut here ]------------
[ 476.338223] kernel BUG at fs/buffer.c:1821!
[ 476.338324] invalid opcode: 0000 [#1]
[ 476.338423] PREEMPT
[ 476.338665] Modules linked in:
[ 476.338833] CPU: 0
[ 476.338836] EIP: 0060:[<c01a1914>] Not tainted VLI
[ 476.338840] EFLAGS: 00010202 (2.6.22-rc4-mm2 #1)
[ 476.339206] EIP is at __block_prepare_write+0x64/0x410
[ 476.339311] eax: 00000001 ebx: c136fbb8 ecx: c07faf28 edx:
00000001
[ 476.339417] esi: c1dc9040 edi: c32d2dfc ebp: c3733db8 esp:
c3733d50
[ 476.339584] ds: 007b es: 007b fs: 0000 gs: 0033 ss: 0068
[ 476.339690] Process vmsplice01 (pid: 7680, ti=c3733000 task=c351ed60
task.ti=c3733000)
[ 476.339796] Stack: c3733d70 c0143e76 c1a0eab0 00000046 00000000
c2509d64 00000cd8 c136fbb8
[ 476.340675] c32d2dfc 00000296 c02313b6 c1086088 00000050
c02313b6 c1dc9040 c2509d50
[ 476.341491] c1dc9054 c3733dc4 c02313e9 c3733dbc c015728d
c32d2f0c 00000000 c136fbb8
[ 476.342371] Call Trace:
[ 476.342565] [<c01a1d83>] block_write_begin+0x83/0xf0
[ 476.342804] [<c0207778>] ext3_write_begin+0xc8/0x1c0
[ 476.342987] [<c01595bf>] pagecache_write_begin+0x4f/0x150
[ 476.343243] [<c019db3b>] pipe_to_file+0x9b/0x170
[ 476.343418] [<c019d4b0>] __splice_from_pipe+0x70/0x260
[ 476.343654] [<c019d6e8>] splice_from_pipe+0x48/0x70
[ 476.343828] [<c019d9f8>] generic_file_splice_write+0x88/0x130
[ 476.344066] [<c019d267>] do_splice_from+0xb7/0xc0
[ 476.344240] [<c019ea51>] sys_splice+0x1a1/0x230
[ 476.344474] [<c01043be>] sysenter_past_esp+0x5f/0x99
[ 476.344656] [<ffffe410>] 0xffffe410
[ 476.344882] =======================
[ 476.344984] INFO: lockdep is turned off.
[ 476.345084] Code: 00 0f 97 c2 e8 ee 2f 22 00 85 c0 74 04 0f 0b eb fe
31 d2 b8 28 af 7f c0 81 7d 08 00 10 00 00 0f 97 c2 e8 d0 2f 22 00 85 c0
74 04 <0f> 0b eb fe 8b 55 08 39 55 b0 0f 97 c0 0f b6 d0 b8 0c af 7f c0
[ 476.350365] EIP: [<c01a1914>] __block_prepare_write+0x64/0x410 SS:ESP
0068:c3733d50
Yep, vmsplice01 is not supported on -mm kernels ;)
Nick has a protofix but I don't think it's been tested yet.
Yeah, sorry I didn't catch that after you merged :P
This should be the correct bugfix attached -- it is just a typo.
--
SUSE Labs, Novell Inc.
Index: linux-2.6/fs/splice.c
===================================================================
--- linux-2.6.orig/fs/splice.c
+++ linux-2.6/fs/splice.c
@@ -570,7 +570,7 @@ static int pipe_to_file(struct pipe_inod
if (this_len + offset > PAGE_CACHE_SIZE)
this_len = PAGE_CACHE_SIZE - offset;
- ret = pagecache_write_begin(file, mapping, sd->pos, sd->len,
+ ret = pagecache_write_begin(file, mapping, sd->pos, this_len,
AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata);
if (unlikely(ret))
goto out;
@@ -583,11 +583,12 @@ static int pipe_to_file(struct pipe_inod
char *dst = kmap_atomic(page, KM_USER1);
memcpy(dst + offset, src + buf->offset, this_len);
+ flush_dcache_page(page);
kunmap_atomic(dst, KM_USER1);
buf->ops->unmap(pipe, buf, src);
}
- ret = pagecache_write_end(file, mapping, sd->pos, sd->len, sd->len, page, fsdata);
+ ret = pagecache_write_end(file, mapping, sd->pos, this_len, this_len, page, fsdata);
out:
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