Bug#546809: [Pkg-samba-maint] Bug#546809: listing contents of remote directory does not show all content and can cause kernel panic
I applied the patch and rebuilt the kernel, but the problem remains.
-Kevin
Ben Hutchings wrote:
> On Wed, 2009-09-16 at 12:02 -0700, Kevin wrote:
>
>> Ben,
>>
>> I tried running ls repeatedly with no problems other than the missing
>> files. This worked for a few minutes until it hit the error again. I
>> did not see anything on the console as the system rebooted upon
>> hitting the error. The kern.log file shows this just before the
>> system rebooted:
>>
>> CIFS VFS: RFC1001 size 35 bigger than SMB for Mid=749
>> Sep 16 09:48:31 webdata kernel: [ 475.319384] Bad SMB: : dump of 48 bytes of data at 0xf6a10980
>> Sep 16 09:48:31 webdata kernel: [ 475.319394] 00000023 424d53ff 00000074 00018800 # . . . � S M B t . . . . . . .
>> Sep 16 09:48:31 webdata kernel: [ 475.319402] 00000000 00000000 00000000 0cec0000 . . . . . . . . . . . . . . � .
>> Sep 16 09:48:31 webdata kernel: [ 475.319410] 02ed0000 6a00ff00 02000000 00003800 . . � . . � . j . . . . . 8 . .
>> Sep 16 09:48:54 webdata kernel: [ 501.027724] CIFS VFS: server not responding
>> Sep 16 09:48:54 webdata kernel: [ 501.027724] CIFS VFS: No response to cmd 116 mid 749
>>
>> I have found the following bug report which seems to describe the same problem.
>>
>> http://www.linux-archive.org/debian-kernel/216752-bug-509428-bug-509428-libsmbclient-system-freeze-when-accessing-samba-cifs-share-network-appliances-storage.html
>>
>
> That could be the same bug. It was apparently fixed somewhere between
> 2.6.26 and 2.6.29, but the precise change was not identified. This
> could be it, though:
>
> commit 76c510ad2e7d56cfe8f2cc7b23783e5c687cf704
> Author: Shirish Pargaonkar <shirishp@gmail.com>
> Date: Thu Jul 24 14:48:33 2008 +0000
>
> [CIFS] Fix possible double free if search immediately after search rewind fails
>
> Signed-off-by: Shirish Pargaonkar <shirishp@us.ibm.com>
> Signed-off-by: Steve French <sfrench@us.ibm.com>
>
> diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
> index 83f3069..5f40ed3 100644
> --- a/fs/cifs/readdir.c
> +++ b/fs/cifs/readdir.c
> @@ -690,6 +690,7 @@ static int find_cifs_entry(const int xid, struct cifsTconInfo *pTcon,
> else
> cifs_buf_release(cifsFile->srch_inf.
> ntwrk_buf_start);
> + cifsFile->srch_inf.ntwrk_buf_start = NULL;
> }
> rc = initiate_cifs_search(xid, file);
> if (rc) {
> --- END ---
>
> Can you test whether this patch fixes the bug? Instructions for
> rebuilding a Debian kernel package are here:
> <http://kernel-handbook.alioth.debian.org/ch-common-tasks.html#s-common-official>.
>
> Ben.
>
>
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