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[DragonFlyBSD - Bug #2556] DragonFly v3.5.0.81.gd3479 - Process signal weirdness

From: "Antonio M. Huete Jimenez via Redmine" <bugtracker-admin@xxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 7 May 2013 15:59:34 -0700

Issue #2556 has been reported by tuxillo.

Bug #2556: DragonFly v3.5.0.81.gd3479 - Process signal weirdness

Author: tuxillo
Status: New
Priority: Normal
Target version: 


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 ?? ()

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