We are using lwip as a linux kernel module in a multi threaded environment.
Here is the sequence of events that are leading to the crash in my case. As the application is continuously sending data, do_write continuously calls do_writemore, which internally calls tcp_write. At some point tcp_write returns ERR_MEM and do_write waits on semaphore op_completed. When an ack is received from the other end, tcp_input function calls sent_tcp which calls do_writemore, if the state of the connection is NETCONN_WRITE. In do_writemore function access to the data pointer (dataptr) resulting this crash. My fix: In sent_tcp function, i am signalling the op_completed semaphore and from do_write function i am calling do_writemore again, which is working fine. What could be the reason for the crash in the first case, is it i am using lwip threads incorrectly ? Please let me know if you need any further clarification. Thanks, Anil On Mon, Sep 3, 2012 at 4:32 PM, Anil kumar <[email protected]> wrote: > Some debugging using prints is indicating that this crash is resulting > when the available send buffer size reaches zero. The send buffer size in > my opt.h is 32KB and the packet sizes generated by the application is 128. > > The available send buffer reaching zero indicates any leaks ? > > Thanks, > Anil > > > > > > On Fri, Aug 31, 2012 at 5:13 PM, Anil kumar <[email protected]>wrote: > >> Hi All, >> >> We are using LWIP on linux platform. When we are testing it is crashing >> repeatedly with the following crash dump. >> Any help in this regard would be very much helpful. >> >> >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495042] *pde = 1bd04067 >> *pte = 00000000 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495110] Modules linked in: >> lwip(O) ops(O) complib(O) rfcomm bnep bluetooth binfmt_misc i915 >> drm_kms_helper dr >> m ppdev snd_hda_codec_realtek parport_pc snd_hda_intel snd_hda_codec >> snd_hwdep i2c_algo_bit video snd_pcm snd_seq_midi snd_rawmidi psmouse >> serio_raw snd_seq >> _midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc >> lp parport 8139too 8139cp r8169 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495424] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495439] Pid: 2913, comm: >> tcpip_input_tim Tainted: G O 3.2.2 #3 /DG41RQ >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495504] EIP: >> 0060:[<c12a1f2d>] EFLAGS: 00010212 CPU: 1 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495541] EIP is at >> memcpy+0x1d/0x40 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495568] EAX: f947c78a EBX: >> 00000064 ECX: 00000019 EDX: 0811f550 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495607] ESI: 0811f550 EDI: >> f947c78a EBP: dbffde18 ESP: dbffde0c >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495644] DS: 007b ES: 007b >> FS: 00d8 GS: 00e0 SS: 0068 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495739] 00000064 f947c78a >> 0811f550 dbffde3c f92ea0fe f92f6db4 f947c78a 0811f550 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495809] 00000064 f947c2d0 >> 00000064 f92fb930 dbffdeb8 f92f21de f92f9303 f947c78a >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495879] 0811f550 00000000 >> 00000056 c1901496 0000de66 00000064 205b0246 32313620 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.495983] [<f92ea0fe>] >> lwip_chksum_copy+0x3e/0x60 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92f21de>] >> tcp_write+0x66e/0x990 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e6f74>] >> do_writemore+0x164/0x370 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e73c0>] ? >> poll_tcp+0xb0/0xb0 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e743f>] >> sent_tcp+0x7f/0xc0 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92eef67>] ? >> tcp_parseopt.isra.0+0x27/0xe0 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e73c0>] ? >> poll_tcp+0xb0/0xb0 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92ef5d5>] >> tcp_input+0x5b5/0xf30 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92eb562>] >> ip_input+0x2b2/0x2d0 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e959b>] >> ethernet_input+0x7b/0x330 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c1026288>] ? >> default_spin_lock_flags+0x8/0x10 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c156fdbd>] ? >> _raw_spin_lock_irqsave+0x2d/0x40 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c106ba19>] ? >> down+0x29/0x40 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e8220>] ? >> pbuf_free_int+0x10/0x10 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e831c>] >> tcpip_thread+0xfc/0x160 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<f92e8220>] ? >> pbuf_free_int+0x10/0x10 [lwip] >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c1065dcd>] >> kthread+0x6d/0x80 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c1065d60>] ? >> flush_kthread_worker+0x80/0x80 >> Aug 31 15:52:13 neelima-desktop kernel: [ 612.496003] [<c1576efe>] >> kernel_thread_helper+0x6/0x10 >> Aug 31 15:52:14 neelima-desktop kernel: [ 612.557620] ---[ end trace >> 333a796a57491d86 ]--- >> >> Thanks, >> Anil >> > >
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