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Re: [lwip-devel] Possibly bug.


From: Simon Goldschmidt
Subject: Re: [lwip-devel] Possibly bug.
Date: Tue, 12 Jan 2010 13:24:41 +0100

Vadim Melihow wrote:
> Have 2 threads. - tcp/ip thread & tcp read thread.
> Use CVS head & socket API
> 
> 
> it look like lwip bug, but Im not sure. Please fix me if I mistaken

Since you are on CVS head, that might indeed be a bug in my recent changes to 
fix another bug... Could you file a bug report on savannah to make sure this 
doesn't get forgotten?

Simon

> 
> Thanks.
> 
> 
> Ok.  I just have segfault sometimes
> 
> TCP thread  backtrace -
> ------------------------------------
> #0  0x08063b10 in sys_mbox_post (mbox=0x0, msg=0x0) at
> lwip/cvs/contrib/ports/unix/sys_arch.c:372
> #1  0x0808ea58 in err_tcp (arg=0x826216c, err=-6 '�') at
> lwip/cvs/contrib/../lwip/src/api/api_msg.c:322
> #2  0x0808a7d1 in tcp_input (p=0x85f1c60, inp=0x88363f4) at
> lwip/cvs/contrib/../lwip/src/core/tcp_in.c:313
> #3  0x08060db7 in ip_input (p=0x85f1c60, inp=0x88363f4) at
> lwip/cvs/contrib/../lwip/src/core/ipv4/ip.c:417
> #4  0x08061e3c in tcpip_thread (arg=0x0) at
> lwip/cvs/contrib/../lwip/src/api/tcpip.c:111
> #5  0xb7ac81b5 in start_thread () from /lib/libpthread.so.0
> #6  0xb7e523ae in clone () from /lib/libc.so.6
> (gdb) up
> #1  0x0808ea58 in err_tcp (arg=0x826216c, err=-6 '�') at
> lwip/cvs/contrib/../lwip/src/api/api_msg.c:322
> 322         sys_mbox_post(conn->recvmbox, NULL);
> (gdb) p *conn
> $4 = {type = NETCONN_TCP, state = NETCONN_NONE, pcb = {ip = 0x0, tcp =
> 0x0,
> udp = 0x0, raw = 0x0}, err = -6 '�', op_completed = 0x899e998, recvmbox
> =
> 0x0,
>   acceptmbox = 0x0, socket = 2, recv_timeout = 1000, recv_bufsize =
> 2147483647, recv_avail = 0, write_msg = 0x0, write_offset = 0,
>   callback = 0x806e77d <sx3g_event_callback>}
> 
> 
> 
> READER thread backtrace
> (gdb) bt
> #2  0xb7e5eb84 in pthread_cond_timedwait () from /lib/libc.so.6
> #3  0x08064138 in cond_wait (cond=0x89db07c, mutex=0x89db0ac, timeout=1)
> at
> lwip/cvs/contrib/ports/unix/sys_arch.c:617
> #4  0x08064223 in sys_arch_sem_wait (sem=0x89db078, timeout=1) at
> lwip/cvs/contrib/ports/unix/sys_arch.c:650
> #5  0x08063d58 in sys_arch_mbox_fetch (mbox=0x8abb148, msg=0xb4f04298,
> timeout=1) at lwip/cvs/contrib/ports/unix/sys_arch.c:476
> #6  0x0808efe3 in netconn_drain (conn=0x826216c, bytes_drained=0xb4f042d0,
> accepts_drained=0xb4f042ce) at
> lwip/cvs/contrib/../lwip/src/api/api_msg.c:624
> #7  0x0808dec7 in netconn_delete (conn=0x826216c) at
> lwip/cvs/contrib/../lwip/src/api/api_lib.c:114
> #8  0x0806bcb0 in lwip_close (s=2) at  sockets.c:421
> #9  0x0806a14f in tcp_read_thread (arg=0x8836328) at tcp_handlers.c:408
> #10 0xb7ac81b5 in start_thread () from /lib/libpthread.so.0
> #11 0xb7e523ae in clone () from /lib/libc.so.6
> 
> 
> Situation -
> - we got RST from remote side
> - tcp/ip thread call err_tcp
> @api_msg.c line 319
> 
>   if (conn->recvmbox != SYS_MBOX_NULL) {
>     /* Register event with callback */
>     API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
>     sys_mbox_post(conn->recvmbox, NULL);
>   }
> 
> 
> -  After   API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0); TCP read thread got
>  waked  and start trying read from socket and cause lwip_read returned - 0
> bytes - trying to close socket
> 
> - First all lwip_close call netconn_delete -> netconn_drain
> netconn_drain set recvmbox to SYS_MBOX_NULL and after switch context to
> tcp/ip thread we got segfault at sys_mbox_post(conn->recvmbox, NULL); 
> cause
> recvmbox = NULL
> 
>   Plsease fix me if I wrong.

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