On 2019-07-12 04:27, Willy Tarreau wrote:

If you can at least show the backtrace, this could be useful and we
can see if the core would be needed or not. Maybe this will match
another known bug.

This is the BT of yesterday:

---
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 27066
[New LWP 27067]
[New LWP 27068]
[New LWP 27069]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007f08655ef303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
84      ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) thread apply all bt

Thread 4 (Thread 0x7f084d058700 (LWP 27069)):
#0 0x00007f08655ef303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x0000562cea640f95 in ?? ()
#2  0x0000562cea6e6792 in ?? ()
#3 0x00007f086666c4a4 in start_thread (arg=0x7f084d058700) at pthread_create.c:456 #4 0x00007f08655eed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 3 (Thread 0x7f084d859700 (LWP 27068)):
#0  0x0000562cea6af336 in ?? ()
#1  0x0000562cea73cd1d in si_cs_send ()
#2  0x0000562cea73d90a in si_update_both ()
#3  0x0000562cea6a1976 in process_stream ()
#4  0x0000562cea770728 in process_runnable_tasks ()
#5  0x0000562cea6e67c1 in ?? ()
#6 0x00007f086666c4a4 in start_thread (arg=0x7f084d859700) at pthread_create.c:456 #7 0x00007f08655eed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7f084e05a700 (LWP 27067)):
#0 0x00007f08655ef303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x0000562cea640f95 in ?? ()
#2  0x0000562cea6e6792 in ?? ()
#3 0x00007f086666c4a4 in start_thread (arg=0x7f084e05a700) at pthread_create.c:456 #4 0x00007f08655eed0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7f0866e5c180 (LWP 27066)):
#0 0x00007f08655ef303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x0000562cea640f95 in ?? ()
#2  0x0000562cea6e6792 in ?? ()
#3  0x0000562cea63e96c in main ()
---

And today I had another one:

---
GNU gdb (Debian 7.12-6) 7.12.0.20161007-git
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
Attaching to process 6982
[New LWP 6983]
[New LWP 6984]
[New LWP 6985]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". 0x00007fbdf0713303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
84      ../sysdeps/unix/syscall-template.S: No such file or directory.
(gdb) thread apply all bt

Thread 4 (Thread 0x7fbdd817c700 (LWP 6985)):
#0  0x00005606dd570457 in ?? ()
#1  0x00005606dd5fdd1d in si_cs_send ()
#2  0x00005606dd5ff45d in si_cs_io_cb ()
#3  0x00005606dd6319a6 in process_runnable_tasks ()
#4  0x00005606dd5a77c1 in ?? ()
#5 0x00007fbdf17904a4 in start_thread (arg=0x7fbdd817c700) at pthread_create.c:456 #6 0x00007fbdf0712d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 3 (Thread 0x7fbdd897d700 (LWP 6984)):
#0 0x00007fbdf0713303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00005606dd501f95 in ?? ()
#2  0x00005606dd5a7792 in ?? ()
#3 0x00007fbdf17904a4 in start_thread (arg=0x7fbdd897d700) at pthread_create.c:456 #4 0x00007fbdf0712d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 2 (Thread 0x7fbdd917e700 (LWP 6983)):
#0 0x00007fbdf0713303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00005606dd501f95 in ?? ()
#2  0x00005606dd5a7792 in ?? ()
#3 0x00007fbdf17904a4 in start_thread (arg=0x7fbdd917e700) at pthread_create.c:456 #4 0x00007fbdf0712d0f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:97

Thread 1 (Thread 0x7fbdf1f80180 (LWP 6982)):
#0 0x00007fbdf0713303 in epoll_wait () at ../sysdeps/unix/syscall-template.S:84
#1  0x00005606dd501f95 in ?? ()
#2  0x00005606dd5a7792 in ?? ()
#3  0x00005606dd4ff96c in main ()
---

I have core-dumps of them both. Let me know if you want them ;-)

Sander


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