Re: Instability of phycodorus in pg_upgrade tests with JIT

On Fri, Oct 17, 2025 at 8:32 AM Michael Paquier <michael(at)paquier(dot)xyz> wrote:
>
> On Thu, Oct 16, 2025 at 10:00:00PM +0300, Alexander Lakhin wrote:
> > I collected all of such failures here:
> > https://wiki.postgresql.org/wiki/Known_Buildfarm_Test_Failures#check-pg_upgrade_fails_on_LLVM-enabled_animals_due_to_double_free_or_corruption
> >
> > Masao-san was going to dig into that:
> > https://www.postgresql.org/message-id/CAHGQGwFcjccSYX+Ap8meEbCccUei-B4tmYsBFu4wMEixKi90fQ@mail.gmail.com

I tried that briefly, but unfortunately I still have no idea what caused
this failure or what triggered the double-free issue shown below…

-----------------------------------
[New LWP 978394]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by
`/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/tmp_install/home/bf/bf-build/petalura/REL_13_STABLE/inst/bin/postgres
'' '' '' '' '''.
Program terminated with signal SIGABRT, Aborted.
#0 __pthread_kill_implementation (threadid=<optimized out>,
signo=signo(at)entry=6, no_tid=no_tid(at)entry=0) at
./nptl/pthread_kill.c:44

warning: 44 ./nptl/pthread_kill.c: No such file or directory
#0 __pthread_kill_implementation (threadid=<optimized out>,
signo=signo(at)entry=6, no_tid=no_tid(at)entry=0) at
./nptl/pthread_kill.c:44
#1 0x00007f6b19e9e9ff in __pthread_kill_internal (threadid=<optimized
out>, signo=6) at ./nptl/pthread_kill.c:89
#2 0x00007f6b19e49cc2 in __GI_raise (sig=sig(at)entry=6) at
../sysdeps/posix/raise.c:26
#3 0x00007f6b19e324ac in __GI_abort () at ./stdlib/abort.c:73
#4 0x00007f6b19e33291 in __libc_message_impl
(fmt=fmt(at)entry=0x7f6b19fb532d "%s\\n") at
../sysdeps/posix/libc_fatal.c:134
#5 0x00007f6b19ea8465 in malloc_printerr
(str=str(at)entry=0x7f6b19fb86f8 "double free or corruption (!prev)") at
./malloc/malloc.c:5829
#6 0x00007f6b19eaa56c in _int_free_merge_chunk
(av=av(at)entry=0x7f6b19ff1ac0 <main_arena>, p=p(at)entry=0xfba29e0,
size=272) at ./malloc/malloc.c:4721
#7 0x00007f6b19eaa6c6 in _int_free_chunk (av=av(at)entry=0x7f6b19ff1ac0
<main_arena>, p=p(at)entry=0xfba29e0, size=<optimized out>,
have_lock=<optimized out>, have_lock(at)entry=0) at
./malloc/malloc.c:4667
#8 0x00007f6b19ead3c0 in _int_free (av=0x7f6b19ff1ac0 <main_arena>,
p=0xfba29e0, have_lock=0) at ./malloc/malloc.c:4699
#9 __GI___libc_free (mem=<optimized out>) at ./malloc/malloc.c:3476
#10 0x00007f6b1a29053c in ?? () from /lib/x86_64-linux-gnu/libgcc_s.so.1
#11 0x00007f6b1a290574 in ?? () from /lib/x86_64-linux-gnu/libgcc_s.so.1
#12 0x00007f6b1b2b7fc2 in _dl_call_fini
(closure_map=closure_map(at)entry=0x7f6b1ae49660) at
./elf/dl-call_fini.c:43
#13 0x00007f6b1b2bae72 in _dl_fini () at ./elf/dl-fini.c:120
#14 0x00007f6b19e4c291 in __run_exit_handlers (status=0,
listp=0x7f6b19ff1680 <__exit_funcs>,
run_list_atexit=run_list_atexit(at)entry=true,
run_dtors=run_dtors(at)entry=true) at ./stdlib/exit.c:118
#15 0x00007f6b19e4c35a in __GI_exit (status=<optimized out>) at
./stdlib/exit.c:148
#16 0x000000000078d80c in proc_exit (code=0) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/storage/ipc/ipc.c:156
#17 0x00000000007b44e1 in PostgresMain (argc=1, argv=<optimized out>,
dbname=<optimized out>, username=<optimized out>) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/tcop/postgres.c:4604
#18 0x000000000073498b in BackendRun (port=0xf8562a0) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/postmaster/postmaster.c:4561
#19 0x0000000000734337 in BackendStartup (port=<optimized out>) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/postmaster/postmaster.c:4245
#20 0x0000000000733b33 in ServerLoop () at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/postmaster/postmaster.c:1744
#21 0x0000000000731e47 in PostmasterMain (argc=<optimized out>,
argv=<optimized out>) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/postmaster/postmaster.c:1417
#22 0x0000000000693d89 in main (argc=6, argv=0xf7d90c0) at
/home/bf/bf-build/petalura/REL_13_STABLE/pgsql.build/../pgsql/src/backend/main/main.c:212
$1 = {si_signo = 6, si_errno = 0, si_code = -6, _sifields = {_pad =
{978394, 1000, 0 <repeats 26 times>}, _kill = {si_pid = 978394, si_uid
= 1000}, _timer = {si_tid = 978394, si_overrun = 1000, si_sigval =
{sival_int = 0, sival_ptr = 0x0}}, _rt = {si_pid = 978394, si_uid =
1000, si_sigval = {sival_int = 0, sival_ptr = 0x0}}, _sigchld =
{si_pid = 978394, si_uid = 1000, si_status = 0, si_utime = 0, si_stime
= 0}, _sigfault = {si_addr = 0x3e8000eedda}, _sigpoll = {si_band =
4294968274394, si_fd = 0}, _sigsys = {_call_addr = 0x3e8000eedda,
_syscall = 0, _arch = 0}}}

Regards,

--
Fujii Masao