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https://issues.apache.org/jira/browse/TS-4547?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Call resolved TS-4547.
----------------------------
Resolution: Duplicate
Fix Version/s: (was: 7.0.0)
> NULL handler being scheduled
> ----------------------------
>
> Key: TS-4547
> URL: https://issues.apache.org/jira/browse/TS-4547
> Project: Traffic Server
> Issue Type: Bug
> Components: HTTP
> Reporter: Bryan Call
> Priority: Blocker
>
> There is a continuation that is being scheduled with a NULL handler. I added
> an assert to Event::init() to catch the code trying to do it:
> backtrace of the assert:
> {code}
> (gdb) bt
> #0 0x0000003818032625 in raise () from /lib64/libc.so.6
> #1 0x0000003818033d8d in abort () from /lib64/libc.so.6
> #2 0x00002b3186ed60c8 in ink_die_die_die (fmt=0x2b3186ee262f "%s:%d: failed
> assert `%s`", ap=0x2b318b536718) at
> ../../../trafficserver/lib/ts/ink_error.cc:43
> #3 ink_fatal_va(const char *, typedef __va_list_tag __va_list_tag *)
> (fmt=0x2b3186ee262f "%s:%d: failed assert `%s`", ap=0x2b318b536718) at
> ../../../trafficserver/lib/ts/ink_error.cc:65
> #4 0x00002b3186ed615c in ink_fatal (message_format=Unhandled dwarf
> expression opcode 0xf3
> ) at ../../../trafficserver/lib/ts/ink_error.cc:73
> #5 0x00002b3186ed4445 in _ink_assert (expression=Unhandled dwarf expression
> opcode 0xf3
> ) at ../../../trafficserver/lib/ts/ink_assert.cc:37
> #6 0x00000000004fcd4c in init (this=0x2b31e800dd48, event=1108,
> data=0x2b31e80a70b0) at
> ../../trafficserver/iocore/eventsystem/P_UnixEvent.h:30
> #7 schedule_imm (this=0x2b31e800dd48, event=1108, data=0x2b31e80a70b0) at
> ../../trafficserver/iocore/eventsystem/P_UnixEThread.h:52
> #8 ProxyClientTransaction::adjust_thread (this=0x2b31e800dd48, event=1108,
> data=0x2b31e80a70b0) at ../../trafficserver/proxy/ProxyClientTransaction.cc:95
> #9 0x0000000000540af3 in HttpSM::state_cache_open_write
> (this=0x2b3241116800, event=1108, data=0x2b31e80a70b0) at
> ../../../trafficserver/proxy/http/HttpSM.cc:2459
> #10 0x000000000054fa38 in HttpSM::main_handler (this=0x2b3241116800,
> event=1108, data=0x2b31e80a70b0) at
> ../../../trafficserver/proxy/http/HttpSM.cc:2661
> #11 0x0000000000526bad in handleEvent (this=0x2b3241118110, event=Unhandled
> dwarf expression opcode 0xf3
> ) at ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #12 HttpCacheSM::state_cache_open_write (this=0x2b3241118110, event=Unhandled
> dwarf expression opcode 0xf3
> ) at ../../../trafficserver/proxy/http/HttpCacheSM.cc:186
> #13 0x000000000064d71b in handleEvent (this=0x2b31e80a70b0, event=Unhandled
> dwarf expression opcode 0xf3
> ) at ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #14 CacheVC::callcont (this=0x2b31e80a70b0, event=Unhandled dwarf expression
> opcode 0xf3
> ) at ../../../trafficserver/iocore/cache/P_CacheInternal.h:637
> #15 0x00000000006d67f0 in Cache::open_write (this=Unhandled dwarf expression
> opcode 0xf3
> ) at ../../../trafficserver/iocore/cache/CacheWrite.cc:1754
> #16 0x0000000000526f6f in HttpCacheSM::open_write (this=0x2b3241118110,
> key=Unhandled dwarf expression opcode 0xf3
> ) at ../../../trafficserver/proxy/http/HttpCacheSM.cc:343
> #17 0x000000000053a635 in HttpSM::do_cache_prepare_action
> (this=0x2b3241116800, c_sm=0x2b3241118110, object_read_info=0x0,
> retry=Unhandled dwarf expression opcode 0xf3
> ) at ../../../trafficserver/proxy/http/HttpSM.cc:4645
> #18 0x000000000054ddc6 in do_cache_prepare_write (this=0x2b3241116800) at
> ../../../trafficserver/proxy/http/HttpSM.cc:4567
> #19 HttpSM::set_next_state (this=0x2b3241116800) at
> ../../../trafficserver/proxy/http/HttpSM.cc:7347
> #20 0x000000000054994b in HttpSM::state_api_callout (this=0x2b3241116800,
> event=0, data=0x0) at ../../../trafficserver/proxy/http/HttpSM.cc:1537
> #21 0x000000000054de2b in HttpSM::set_next_state (this=0x2b3241116800) at
> ../../../trafficserver/proxy/http/HttpSM.cc:7116
> #22 0x0000000000542528 in HttpSM::state_hostdb_lookup (this=0x2b3241116800,
> event=500, data=0x2b31909a4820) at
> ../../../trafficserver/proxy/http/HttpSM.cc:2219
> #23 0x000000000054fa38 in HttpSM::main_handler (this=0x2b3241116800,
> event=500, data=0x2b31909a4820) at
> ../../../trafficserver/proxy/http/HttpSM.cc:2661
> #24 0x000000000063ae5c in handleEvent (cont=0x2b3241116800, r=0x2b31909a4820,
> is_srv=Unhandled dwarf expression opcode 0xf3
> ) at ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #25 reply_to_cont (cont=0x2b3241116800, r=0x2b31909a4820, is_srv=Unhandled
> dwarf expression opcode 0xf3
> ) at ../../../trafficserver/iocore/hostdb/HostDB.cc:604
> #26 0x00000000006425db in HostDBContinuation::probeEvent
> (this=0x2b31934fc3c0, e=Unhandled dwarf expression opcode 0xf3
> ) at ../../../trafficserver/iocore/hostdb/HostDB.cc:1912
> #27 0x0000000000642778 in HostDBContinuation::dnsPendingEvent
> (this=0x2b31934fc3c0, event=1, e=0x0) at
> ../../../trafficserver/iocore/hostdb/HostDB.cc:1379
> #28 0x000000000063ab84 in handleEvent (this=0x2b31934fd5e0) at
> ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #29 HostDBContinuation::remove_trigger_pending_dns (this=0x2b31934fd5e0) at
> ../../../trafficserver/iocore/hostdb/HostDB.cc:1969
> #30 0x0000000000640d5d in HostDBContinuation::dnsEvent (this=Unhandled dwarf
> expression opcode 0xf3
> ) at ../../../trafficserver/iocore/hostdb/HostDB.cc:1661
> #31 0x0000000000659af5 in handleEvent (this=0x2b31e003ab00) at
> ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #32 DNSEntry::postEvent (this=0x2b31e003ab00) at
> ../../../trafficserver/iocore/dns/DNS.cc:1269
> #33 0x0000000000756f0a in handleEvent (this=0x2b3189d20010, e=0x2b31f00878c0,
> calling_code=1) at
> ../../../trafficserver/iocore/eventsystem/I_Continuation.h:153
> #34 EThread::process_event (this=0x2b3189d20010, e=0x2b31f00878c0,
> calling_code=1) at
> ../../../trafficserver/iocore/eventsystem/UnixEThread.cc:148
> #35 0x0000000000757d38 in EThread::execute (this=0x2b3189d20010) at
> ../../../trafficserver/iocore/eventsystem/UnixEThread.cc:202
> #36 0x00000000007569b5 in spawn_thread_internal (a=0x1957730) at
> ../../../trafficserver/iocore/eventsystem/Thread.cc:86
> #37 0x00002b3187d33aa1 in start_thread () from /lib64/libpthread.so.0
> #38 0x00000038180e893d in clone () from /lib64/libc.so.6
> {code}
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