[asterisk-bugs] [JIRA] (ASTERISK-23580) [patch]deadlock on forced disconnect of DAHDI PRI span

[Rusty Newton (JIRA)]

Rusty Newton created ASTERISK-23580:
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             Summary: [patch]deadlock on forced disconnect of DAHDI PRI span
                 Key: ASTERISK-23580
                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-23580
             Project: Asterisk
          Issue Type: Bug
      Security Level: None
          Components: Channels/chan_dahdi
    Affects Versions: SVN, 12.1.1
            Reporter: Tzafrir Cohen


There is a deadlock on the locks of iflock (the chan_dahdi lock of the interfaces list) and pri->lock of the specific span.

Path 1:
DAHDI_EVENT_REMOVED received on a B channel. Later on:
do_monitor
dahdi_destroy_channel_range (takes iflock)
destroy_dahdi_pvt
dahdi_unlink_pri_pvt (tries to take pri->lock)

Path 2:
pri_dchannel (takes pri->lock)
sig_pri_handle_dchan_exception
my_handle_dchan_exception (handling DAHDI_EVENT_REMOVED)
pri_destroy_span
dahdi_destroy_channel_range (tries to take iflock)

It seems that this is esy to reproduce as DAHDI will emit a DAHDI_EVENT_REMOVED in response to any ioctl on a channel in a device that has been removed.



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