[ ssic-linux-Bugs-1378857 ] Wine IPC broken by file delete

Bugs item #1378857, was opened at 2005-12-12 17:47
Message generated for change (Settings changed) made by hughesj
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Category: Filesystem
Group: v1.9.1
Status: Closed
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: John Hughes (hughesj)
Assigned to: Nobody/Anonymous (nobody)
Summary: Wine IPC broken by file delete

Initial Comment:
On a 1.9.2 (from CVS) kernel, Debian sid (unstable)

Wine crashes with the bizarre error:

Protocol error: process 0x8082cf0: sendmsg: No such
file or directory

On the console I see:

reop_export_path: Can't export unlinked file
/cluster/node5/tmp/.wine-john/server-812-5dcd2/anonmap.Q0XgZn
(deleted)

strace of the wine session shows:

331200 bind(5, {sa_family=AF_FILE, path="socket"}, 9) = 0
331197 recvmsg(3,  <unfinished ...>
331200 sendmsg(15, {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\0", 4}], msg_controllen=16,
msg_control=0x807d298, , msg_flags=0}, 0) = 4
331197 <... recvmsg resumed> {msg_name(0)=NULL,
msg_iov(1)=[{"\0\0\0\0", 4}], msg_controllen=16,
msg_control=0xbfffd4f4, , msg_flags=0}, 0) = 4
[...]
331197 recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"\24\0\0\0", 4}], msg_controllen=16,
msg_control=0xbfffbee0, , msg_flags=0}, 0) = 4
331200 open("anonmap.Q0XgZn",
O_RDWR|O_CREAT|O_EXCL|O_LARGEFILE, 0600) = 22
331200 unlink("anonmap.Q0XgZn")         = 0
331200 sendmsg(15, {msg_name(0)=NULL,
msg_iov(1)=[{"\24\0\0\0", 4}], msg_controllen=16,
msg_control=0x807d298, , msg_flags=0}, 0) = -1 ENOENT
(No such file or directory)

So the two processes are happily chatting away with
sendmsg and recvmesg until one of them creates and
deletes a file at which point the system seems to think
that the socket has gone away and sendmesg gets an
ENOENT (which is not even a documented error for sendmesg).



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Comment By: John Hughes (hughesj)
Date: 2007-02-16 10:55

Message:
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Originator: YES

Fixed by Roger some time ago.

----------------------------------------------------------------------

Comment By: Nobody/Anonymous (nobody)
Date: 2006-01-26 06:15

Message:
Logged In: NO 

This problem seems to be fixed since 12/24/2005.  Not
getting the errors anymore while using Wine.

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Comment By: Niklas (nkolster)
Date: 2005-12-15 13:46

Message:
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Hi,

decided to test the suggested improvements in this thread:
http://sourceforge.net/mailarchive/forum.php?thread_id=9216174&forum_id=791
ie. removing the #ifdef SKIP and recompiling the kernel, it
didnt help at least for my application. If i try to migrate
it, i still get:
reop_export_path: cant export unlinked file.

Still trying to experiment with some things.

br,
niklas

----------------------------------------------------------------------

Comment By: John Hughes (hughesj)
Date: 2005-12-14 11:49

Message:
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user_id=166336

So, this is almost certainly bug #1201723, i.e. wine has
opened a file, unlinked it and is now using sendmsg to send
the fd to another process.

(In this particular case the other process happens to be on
the same node, but maybe cfs doesn't know that).


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