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Posted to issues@trafficserver.apache.org by GitBox <gi...@apache.org> on 2022/01/14 06:39:04 UTC
[GitHub] [trafficserver] maskit opened a new issue #8604: Crashes on Http1ClientTransaction::handleEvent
maskit opened a new issue #8604:
URL: https://github.com/apache/trafficserver/issues/8604
We've been seeing crashes on 9.2.x.
```
(gdb) bt
#0 0x0000000000000000 in ?? ()
#1 0x0000564a7fd24e3a in handleEvent (this=<optimized out>, event=105, data=0x7f588a566ee0)
at /path/to/ats/iocore/eventsystem/I_Continuation.h:219
#2 read_signal_and_update(int, UnixNetVConnection*) (event=105, vc=0x7f588a566cf0) at UnixNetVConnection.cc:83
#3 0x0000564a7fd25912 in UnixNetVConnection::mainEvent(int, Event*) (this=0x7f588a566cf0, event=<optimized out>, e=<optimized out>)
at UnixNetVConnection.cc:1116
#4 0x0000564a7fd14dc0 in InactivityCop::check_inactivity(int, Event*) (this=0x7f992e0d0000, event=<optimized out>, e=0x7f9936b6efc0) at UnixNet.cc:96
#5 0x0000564a7fd4718b in handleEvent (this=<optimized out>, event=2, data=0x7f9936b6efc0) at ./I_Continuation.h:219
#6 EThread::process_event(Event*, int) (this=0x7f993580dc80, e=0x7f9936b6efc0, calling_code=2) at UnixEThread.cc:164
#7 0x0000564a7fd47bdd in EThread::execute_regular() (this=0x7f993580dc80) at UnixEThread.cc:273
#8 0x0000564a7fd48049 in EThread::execute() (this=0x7f993580dc80) at UnixEThread.cc:364
#9 0x0000564a7fd463d6 in spawn_thread_internal(void*) (a=0x7f99380506d0) at Thread.cc:91
```
I looked int the core file and found that `handler` is nullptr in `handleEvent()`.
https://github.com/apache/trafficserver/blob/b1df63a530187278f71fd0462c52f7ce1155a314/iocore/eventsystem/I_Continuation.h#L214-L220
The continuation (`this` in the code above) seems to be `Http1ClientTransaction`, and it doesn't make sense to me because `Http1ClientTransaction` doesn't have code for event handling.
I'm not 100% sure yet, but I suspect https://github.com/apache/trafficserver/pull/7956 that passes `Http1ClientTransaction` to `do_io_read` is causing the crashes.
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[GitHub] [trafficserver] zwoop closed issue #8604: Crashes on Http1ClientTransaction::handleEvent
Posted by GitBox <gi...@apache.org>.
zwoop closed issue #8604:
URL: https://github.com/apache/trafficserver/issues/8604
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[GitHub] [trafficserver] maskit commented on issue #8604: Crashes on Http1ClientTransaction::handleEvent
Posted by GitBox <gi...@apache.org>.
maskit commented on issue #8604:
URL: https://github.com/apache/trafficserver/issues/8604#issuecomment-1014168364
The crash doesn't happen frequently and I couldn't reproduce it locally, so it's hard to tell if #8609 works, but it should prevent the crash at least.
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