[asterisk-bugs] [JIRA] (ASTERISK-27977) Crash at T38 call disconnection
Asterisk Team (JIRA)
noreply at issues.asterisk.org
Thu Jul 19 15:23:54 CDT 2018
[ https://issues.asterisk.org/jira/browse/ASTERISK-27977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=244190#comment-244190 ]
Asterisk Team commented on ASTERISK-27977:
------------------------------------------
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> Crash at T38 call disconnection
> -------------------------------
>
> Key: ASTERISK-27977
> URL: https://issues.asterisk.org/jira/browse/ASTERISK-27977
> Project: Asterisk
> Issue Type: Information Request
> Security Level: None
> Components: Resources/res_pjsip_t38
> Affects Versions: 13.20.0
> Reporter: Salah Ahmed
> Severity: Minor
>
> Hello,
> I am very new in this asterisk world, please pardon me if it wrong request.
> Actually I am very confused during a study of a core dump, thats why I am requesting here to get some help.
> Scenario:
> This core was happened after a T38 successful call. I assumed it happened due to udptl packet read after call disconnection.
> Back trace full,
> ===================
> #0 0x000000000045dd5f in internal_ao2_traverse (self=0x7fae7063ecc0, flags=flags at entry=OBJ_SEARCH_KEY,
> cb_fn=<optimized out>, arg=arg at entry=0x7fb08a396360, tag=tag at entry=0x0, file=file at entry=0x0,
> line=0, func=0x0, type=AO2_CALLBACK_DEFAULT, data=0x0) at astobj2_container.c:354
> match = 3
> ret = 0x0
> cb_default = 0x7fb11ad88dc0 <session_media_cmp>
> node = 0x4
> traversal_state = 0x7fadffeaaa60
> orig_lock = AO2_LOCK_REQ_MUTEX
> multi_container = 0x0
> multi_iterator = 0x0
> #1 0x000000000045e6f3 in __ao2_callback (arg=0x7fb08a396360, cb_fn=<optimized out>,
> flags=OBJ_SEARCH_KEY, c=<optimized out>) at astobj2_container.c:455
> No locals.
> #2 __ao2_find (c=<optimized out>, arg=arg at entry=0x7fb08a396360, flags=flags at entry=OBJ_SEARCH_KEY)
> at astobj2_container.c:496
> arged = 0x7fb08a396360
> #3 0x00007fb08a393aec in t38_framehook_read (session=0x7fae722a2ad0, session=0x7fae722a2ad0, f=0x0,
> chan=0x7fae73b24150) at res_pjsip_t38.c:448
> session_media = <optimized out>
> #4 t38_framehook (chan=0x7fae73b24150, f=0x0, event=<optimized out>, data=<optimized out>)
> at res_pjsip_t38.c:466
> channel = <optimized out>
> #5 0x000000000051cc2b in framehook_list_push_event (framehooks=0x7fae711f6f50, frame=0x0,
> event=AST_FRAMEHOOK_EVENT_READ) at framehook.c:118
> __list_head = 0x7fae711f6f58
> __list_next = 0x0
> __list_prev = <optimized out>
> __list_current = 0x7fae70016be0
> num = 0
> framehook = 0x7fae70016be0
> original_frame = 0x0
> skip = 0x7fadffeaabe0
> skip_size = <optimized out>
> #6 0x00000000004bdd45 in __ast_read (chan=0x7fae73b24150, dropaudio=0) at channel.c:3973
> cause = 0
> __PRETTY_FUNCTION__ = "__ast_read"
> #7 0x00000000004827c6 in bridge_handle_trip (bridge_channel=<optimized out>) at bridge_channel.c:2416
> frame = 0x0
> #8 bridge_channel_wait (bridge_channel=<optimized out>) at bridge_channel.c:2586
> ms = -1
> outfd = -99999
> chan = 0x7fae73b24150
> #9 bridge_channel_internal_join (bridge_channel=0x7fae70e8a560) at bridge_channel.c:2732
> res = 0
> channel_features = 0x0
> swap = 0x7fae70e8a630
> __PRETTY_FUNCTION__ = "bridge_channel_internal_join"
> #10 0x000000000046c600 in bridge_channel_ind_thread (data=data at entry=0x7fae70e8a560) at bridge.c:1782
> bridge_channel = 0x7fae70e8a560
> chan = <optimized out>
> __PRETTY_FUNCTION__ = "bridge_channel_ind_thread"
> #11 0x00000000005e6dfa in dummy_start (data=<optimized out>) at utils.c:1238
> __cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf = {140387192380000, -7728970672055937793,
> 0, 140387183878800, 19, 140385299642112, 7775132476379337983, -7728970105745206017},
> __mask_was_saved = 0}}, __pad = {0x7fadffeaaef0, 0x0,
> 0x7fb13a9d4812 <__libc_thread_freeres+34>, 0x7fae7039e290}}
> __cancel_arg = 0x7fadffeab700
> __not_first_call = <optimized out>
> ret = <optimized out>
> a = {start_routine = 0x46c5e0 <bridge_channel_ind_thread>, data = 0x7fae70e8a560,
> name = 0x7fae70bb9a60 "bridge_channel_ind_thread started at [ 1874] bridge.c bridge_impart_internal()"}
> #12 0x00007fb13b688064 in start_thread (arg=0x7fadffeab700) at pthread_create.c:309
> __res = <optimized out>
> pd = 0x7fadffeab700
> now = <optimized out>
> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140385299642112, -7728970672055937793, 0,
> 140387183878800, 19, 140385299642112, 7775132476400309503, 7773029126418175231},
> mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0,
> cleanup = 0x0, canceltype = 0}}}
> not_first_call = <optimized out>
> pagesize_m1 = <optimized out>
> sp = <optimized out>
> freesize = <optimized out>
> __PRETTY_FUNCTION__ = "start_thread"
> #13 0x00007fb13a97062d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
> ===================
> My confusions are,
> 1. In frame 3 session->media is NULL and in frame 1 __ao2_find method has a null check on c, then how its proceed further?
> In Frame 3
> (gdb) p session->media
> $20 = (struct ao2_container *) 0x0
> 2. t38_framehook_read method takes 3 args but in frame 3 we have found in gdb it takes 4 value. how this is happen? Is this core file corrupted somehow?
> 3. Please advice me some idea how can I move forward on this core dump.
> Please let me know if you need any info on it.
> Thanks,
> Rubel
>
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