[asterisk-bugs] [JIRA] (ASTERISK-24473) crash if a pri DAHDI span is removed in the middle of a call

[Tzafrir Cohen (JIRA)]

Tzafrir Cohen created ASTERISK-24473:
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             Summary: crash if a pri DAHDI span is removed in the middle of a call
                 Key: ASTERISK-24473
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24473
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_dahdi
    Affects Versions: 13.0.0-beta3, 12.0.0
            Reporter: Tzafrir Cohen


Asterisk now includes support for destroying DAHDI channels and pri spans when the device that includes them disappears (try: 'dahdi_span_assignment remove' , or, well, disconnect an Astribank).

(On a different note: some work is needed to support mfcr2 and ss7 channels)

However this fails to work when a channel is part of a span and is in the middle of a call. destroy_channel() is called with now=1.

One example backtrace:

#0  0x0039e560 in pthread_mutex_trylock () from /lib/libpthread.so.0
#1  0x04fb11b0 in dahdi_read (ast=0xb72d27b4) at chan_dahdi.c:9207
#2  0x080d0a7b in __ast_read (chan=0xb72d27b4, dropaudio=0) at channel.c:4054
#3  0x080d5cfb in ast_read (c0=0x90a6cec, c1=0xb72d27b4, config=0xb5ee7104, fo=0xb5ee6b60, rc=0xb5ee6b5c) at channel.c:4408
#4  ast_generic_bridge (c0=0x90a6cec, c1=0xb72d27b4, config=0xb5ee7104, fo=0xb5ee6b60, rc=0xb5ee6b5c) at channel.c:7630
#5  ast_channel_bridge (c0=0x90a6cec, c1=0xb72d27b4, config=0xb5ee7104, fo=0xb5ee6b60, rc=0xb5ee6b5c) at channel.c:8105
#6  0x08114482 in ast_bridge_call (chan=0x90a6cec, peer=0xb72d27b4, config=0xb5ee7104) at features.c:4489
#7  0x027807ee in dial_exec_full (chan=0x90a6cec, data=<value optimized out>, peerflags=0xb5ee7958, continue_exec=0x0) at app_dial.c:3047
#8  0x02781bfe in dial_exec (chan=0x90a6cec, data=0xb5ee9cbc "DAHDI/g0/1002,300,Tt") at app_dial.c:3130
#9  0x081789bd in pbx_exec (c=0x90a6cec, app=0x9060c80, data=0xb5ee9cbc "DAHDI/g0/1002,300,Tt") at pbx.c:1622
#10 0x08184556 in pbx_extension_helper (c=0x90a6cec, con=0x0, context=0x90a78a0 "macro-dialout-trunk", exten=0x90a78f0 "s", priority=22, label=0x0, 
    callerid=0xb7201f48 "1001", action=E_SPAWN, found=0xb5eebfb8, combined_find_spawn=1) at pbx.c:4915
#11 0x00e315ac in _macro_exec (chan=<value optimized out>, data=0x90a78f0 "s", exclusive=0) at app_macro.c:412
#12 0x081789bd in pbx_exec (c=0x90a6cec, app=0x904edf0, data=0xb5eee9ac "dialout-trunk,1,1002,,off") at pbx.c:1622
#13 0x08184556 in pbx_extension_helper (c=0x90a6cec, con=0x0, context=0x90a78a0 "macro-dialout-trunk", exten=0x90a78f0 "s", priority=5, label=0x0, 
    callerid=0xb7201f48 "1001", action=E_SPAWN, found=0xb5ef0ad8, combined_find_spawn=1) at pbx.c:4915
#14 0x0818c450 in ast_spawn_extension (c=0x90a6cec, args=0x0) at pbx.c:6037
#15 __ast_pbx_run (c=0x90a6cec, args=0x0) at pbx.c:6512
#16 0x0818e039 in ast_pbx_run_args (c=0x90a6cec) at pbx.c:6890
#17 ast_pbx_run (c=0x90a6cec) at pbx.c:6899
#18 0x04fbd5a9 in __analog_ss_thread (data=0xb728d268) at sig_analog.c:2164
#19 0x081d71f7 in dummy_start (data=0x8cd8cb0) at utils.c:1192
#20 0x0039cb39 in start_thread () from /lib/libpthread.so.0
#21 0x002d8ace in error_at_line () from /lib/libc.so.6
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

and in frame 1: we get that:
p = ast_channel_tech_pvt(ast);

p is NULL



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