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https://issues.apache.org/jira/browse/PROTON-2432?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Clifford Jansen closed PROTON-2432.
-----------------------------------
Resolution: Not A Bug
> Proton crashes because of a concurrency failure in collector->pool
> ------------------------------------------------------------------
>
> Key: PROTON-2432
> URL: https://issues.apache.org/jira/browse/PROTON-2432
> Project: Qpid Proton
> Issue Type: Bug
> Components: proton-c
> Affects Versions: proton-c-0.32.0
> Environment: RHEL 7
> Reporter: Jesse Hulsizer
> Priority: Major
> Attachments: proton-2432.patch
>
>
> While running our application tests, our application crashes with many
> different backtraces that look similar to this...
> {noformat}
> #0 0x0000000000000000 in ?? ()
> #1 0x00007fc777579198 in pn_class_incref () from
> /usr/lib64/libqpid-proton.so.11
> #2 0x00007fc777587d8a in pn_collector_put () from
> /usr/lib64/libqpid-proton.so.11
> #3 0x00007fc7775887ea in ?? () from /usr/lib64/libqpid-proton.so.11
> #4 0x00007fc777588c7b in pn_transport_pending () from
> /usr/lib64/libqpid-proton.so.11
> #5 0x00007fc777588d9e in pn_transport_pop () from
> /usr/lib64/libqpid-proton.so.11
> #6 0x00007fc777599298 in ?? () from /usr/lib64/libqpid-proton.so.11
> #7 0x00007fc77759a784 in ?? () from /usr/lib64/libqpid-proton.so.11
> #8 0x00007fc7773236f0 in proton::container::impl::thread() () from
> /usr/lib64/libqpid-proton-cpp.so.12
> #9 0x00007fc7760b2470 in ?? () from /usr/lib64/libstdc++.so.6
> #10 0x00007fc776309aa1 in start_thread () from /lib64/libpthread.so.0
> #11 0x00007fc7758b6bdd in clone () from /lib64/libc.so.6{noformat}
> Using gdb to probe one of the backtraces show that the collector->pool size
> is -1... (seen here as 18446744073709551615)
> {noformat}
> (gdb) p *collector $1 = \{pool = 0x7fa7182de180, head = 0x7fa7182de250, tail
> = 0x7fa7182b8b90, prev = 0x7fa7182ea010, freed = false}
> (gdb) p collector->pool $2 = (pn_list_t *) 0x7fa7182de180 (gdb) p
> *collector->pool $3 = \{clazz = 0x7fa74eb7c000, capacity = 16, size =
> 18446744073709551615, elements = 0x7fa7182de1b0}{noformat}
> The proton code was marked up with print statements which show that two
> threads were accessing the collector->pool data structure at the same time...
> {noformat}
> 7b070700: pn_list_pop index 0 list->0x7fec401e0b70 value->0x7fec3c728a10
> 4ffff700:pn_list_add index 1 size 2list->0x7fec401e0b70 value->0x7fec402095b0
> 7b070700: pn_list_pop size 1 list->0x7fec401e0b70
> 4ffff700: pn_list_pop size 1 list->0x7fec401e0b70
> 7b070700: pn_list_pop index 0 list->0x7fec401e0b70 value->0x7fec3c728a10
> 4ffff700: pn_list_pop index 0 list->0x7fec401e0b70
> value->0x7fec3c728a10{noformat}
> The hex number on the far left is the thread id. As can be seen in the last
> two lines, two threads are popping from the collector->pool simultaneously.
> This produces the -1 size as seen up above
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