Re: BUG #15036: Un-killable queries Hanging in BgWorkerShutdown - Mailing list pgsql-bugs
| From | David Kohn |
|---|---|
| Subject | Re: BUG #15036: Un-killable queries Hanging in BgWorkerShutdown |
| Date | |
| Msg-id | CAJhMaBhaxnMd4x7ru7t=6yhM5-=X+xpYu8RY0buzQjmx2sE86w@mail.gmail.com Whole thread Raw |
| In response to | Re: BUG #15036: Un-killable queries Hanging in BgWorkerShutdown (Thomas Munro <thomas.munro@enterprisedb.com>) |
| Responses |
Re: BUG #15036: Un-killable queries Hanging in BgWorkerShutdown
|
| List | pgsql-bugs |
Sorry for the delay on this.
You can get a backtrace from a running program with by connecting to
it with gdb -p PID, then bt for the backtrace. You might need to
install the symbols package if you only see addresses (on debianoid
systems postgresql-10-dbgsym, not sure what it's called on RHELish
systems).
https://wiki.postgresql.org/wiki/Getting_a_stack_trace_of_a_running_PostgreSQL_backend_on_Linux/BSD
here's a backtrace from one of the running pids:
```
#0 0x00007f699037c9f3 in __epoll_wait_nocancel () at ../sysdeps/unix/syscall-template.S:84
#1 0x00005639b9d28c61 in WaitEventSetWaitBlock (nevents=1, occurred_events=0x7ffd43678d90, cur_timeout=-1, set=0x5639bbef83c8) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/storage/ipc/latch.c:1048
#2 WaitEventSetWait (set=set@entry=0x5639bbef83c8, timeout=timeout@entry=-1, occurred_events=occurred_events@entry=0x7ffd43678d90, nevents=nevents@entry=1, wait_event_info=wait_event_info@entry=134217728)
at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/storage/ipc/latch.c:1000
#3 0x00005639b9d290d4 in WaitLatchOrSocket (latch=0x7f697e506f54, wakeEvents=wakeEvents@entry=17, sock=sock@entry=-1, timeout=-1, timeout@entry=0, wait_event_info=wait_event_info@entry=134217728)
at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/storage/ipc/latch.c:385
#4 0x00005639b9d29185 in WaitLatch (latch=<optimized out>, wakeEvents=wakeEvents@entry=17, timeout=timeout@entry=0, wait_event_info=wait_event_info@entry=134217728)
at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/storage/ipc/latch.c:339
#5 0x00005639b9cccf1b in WaitForBackgroundWorkerShutdown (handle=0x5639bbe8aaf0) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/postmaster/bgworker.c:1154
#6 0x00005639b9af36fd in WaitForParallelWorkersToExit (pcxt=0x5639bbe8a118, pcxt=0x5639bbe8a118) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/access/transam/parallel.c:655
#7 0x00005639b9af4417 in DestroyParallelContext (pcxt=0x5639bbe8a118) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/access/transam/parallel.c:737
#8 0x00005639b9af4a28 in AtEOXact_Parallel (isCommit=isCommit@entry=0 '\000') at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/access/transam/parallel.c:1006
#9 0x00005639b9affde7 in AbortTransaction () at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/access/transam/xact.c:2538
#10 0x00005639b9b00545 in AbortCurrentTransaction () at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/access/transam/xact.c:3097
#11 0x00005639b9d4bd6d in PostgresMain (argc=1, argv=argv@entry=0x5639bbe9ae40, dbname=0x5639bbe9ad58 "marjory", username=0x5639bbe39a08 "reporter") at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/tcop/postgres.c:3879
#12 0x00005639b9a850d9 in BackendRun (port=0x5639bbe978f0) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/postmaster/postmaster.c:4405
#13 BackendStartup (port=0x5639bbe978f0) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/postmaster/postmaster.c:4077
#14 ServerLoop () at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/postmaster/postmaster.c:1755
#15 0x00005639b9cdb78b in PostmasterMain (argc=5, argv=<optimized out>) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/postmaster/postmaster.c:1363
#16 0x00005639b9a864d5 in main (argc=5, argv=0x5639bbe37850) at /build/postgresql-10-drhiey/postgresql-10-10.3/build/../src/backend/main/main.c:228
```
Joe, cc'd here is a colleague who will be able to help out in future.
Thanks for all the help on this,
David
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