Bug #2556

Updated by tuxillo 4 months ago


tmux has a memory leak somewhere and it was causing a lot of swap memory to be used. I started using truss(1) to see what it was doing and after 3-4 tracing attempts the tmux process was stuck in status "stopevent". After sending to it all sorts of signals (CONT, HUP, KILL) the process is kept stopped in the same situation. I also tried disabling tracing with ktrace(1) but it didn't help.

Eventually I tried to reboot the virtual machine but it got stuck for around 10 minutes without actually being able to shutdown. Last step was dropping to DDB and producing a dump. Dump is available on leaf on demand. See below the backtrace of the thread involved (tmux process)

Best regards,

Antonio Huete


(kgdb) thread 26

[Switching to thread 26 (pid 835/0, tmux)]

#0 0xffffffff8050dfb0 in lwkt_switch () at /home/source/dfbsd/sys/kern/lwkt_thread.c:872

872 /home/source/dfbsd/sys/kern/lwkt_thread.c: No such file or directory.

(kgdb) bt

#0 0xffffffff8050dfb0 in lwkt_switch () at /home/source/dfbsd/sys/kern/lwkt_thread.c:872

#1 0xffffffff80518f0e in tsleep (ident=ident@entry=0xffffffe071efc990, flags=flags@entry=1024,

wmesg=wmesg@entry=0xffffffff8097e168 "stopevent", timo=timo@entry=0) at /home/source/dfbsd/sys/kern/kern_synch.c:612

#2 0xffffffff80538091 in stopevent (p=p@entry=0xffffffe071efc780, event=event@entry=4, val=val@entry=7)

at /home/source/dfbsd/sys/kern/sys_process.c:771

#3 0xffffffff808c5a7a in syscall2 (frame=0xffffffe07280e9f8) at /home/source/dfbsd/sys/platform/pc64/x86_64/trap.c:1229

#4 0xffffffff808af75b in ?? () at /home/source/dfbsd/sys/platform/pc64/x86_64/exception.S:323

#5 0x00000000000000c5 in ?? ()

#6 0x0000000000000000 in ?? ()