Date: Thu, 03 Apr 2014 16:59:07 +0100 From: Karl Pielorz <kpielorz_lst@tdx.co.uk> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Stuck CLOSED sockets / sshd / zombies... Message-ID: <6F730B3126CC5AE636D1E2A0@Mail-PC.tdx.co.uk> In-Reply-To: <201404031103.41171.jhb@freebsd.org> References: <3FE645E9723756F22EF901AE@Mail-PC.tdx.co.uk> <201404021405.56878.jhb@freebsd.org> <9FDC091D98AB2CF92DE4399F@Mail-PC.tdx.co.uk> <201404031103.41171.jhb@freebsd.org>
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--On 03 April 2014 11:03 -0400 John Baldwin <jhb@freebsd.org> wrote:
> Hmm, that fd value doesn't make any sense now. Do you have the backtrace
> for that process? The fd may show up in the arguments to kern_readv().
Ok, bt shows:
"
#0 sched_switch (td=0xfffff800238bb920, newtd=<value optimized out>,
flags=<value optimized out>) at ../../../kern/sched_ule.c:1938
#1 0xffffffff808be76e in mi_switch (flags=260, newtd=0x0) at
../../../kern/kern_synch.c:494
#2 0xffffffff808f9002 in sleepq_catch_signals (wchan=0xfffff80002da4c24,
pri=104) at ../../../kern/subr_sleepqueue.c:429
#3 0xffffffff808f8eaf in sleepq_wait_sig (wchan=0x0, pri=0) at
../../../kern/subr_sleepqueue.c:634
#4 0xffffffff808be195 in _sleep (ident=<value optimized out>, lock=<value
optimized out>, priority=360, wmesg=0xffffffff80efbd30 "sbwait",
sbt=<value optimized out>, pr=0, flags=<value optimized out>) at
../../../kern/kern_synch.c:254
#5 0xffffffff8092328c in sbwait (sb=<value optimized out>) at
../../../kern/uipc_sockbuf.c:130
#6 0xffffffff80926b44 in soreceive_generic (so=0xfffff80002da4ae0,
psa=0x0, uio=0xfffffe0000341ab0, mp0=0x0, controlp=0x0, flagsp=0x0)
at ../../../kern/uipc_socket.c:1496
#7 0xffffffff8090346b in dofileread (td=0xfffff800238bb920, fd=8,
fp=0xfffff80002cf86e0, auio=0xfffffe0000341ab0, offset=<value optimized
out>, flags=0)
at file.h:295
#8 0xffffffff809031a5 in kern_readv (td=0xfffff800238bb920, fd=8,
auio=0xfffffe0000341ab0) at ../../../kern/sys_generic.c:256
#9 0xffffffff80903133 in sys_read (td=<value optimized out>, uap=<value
optimized out>) at ../../../kern/sys_generic.c:171
#10 0xffffffff80c96cd7 in amd64_syscall (td=0xfffff800238bb920, traced=0)
at subr_syscall.c:134
#11 0xffffffff80c7d3fb in Xfast_syscall () at
../../../amd64/amd64/exception.S:391
#12 0x000000080320d9ea in ?? ()
"
So, fd=8? - fstat seems to show that as:
"
USER CMD PID FD MOUNT INUM MODE SZ|DV R/W
root sshd 4346 8* local stream fffff80002e55c30 <-> fffff80002e552d0
...
root sshd 4344 4* local stream fffff80002e552d0 <-> fffff80002e55c30
"
Netstat shows those as:
"
Active UNIX domain sockets
Address Type Recv-Q Send-Q Inode Conn Refs Nextref Addr
fffff80002e55c30 stream 0 0 0 fffff80002e552d0 0 0
fffff80002e552d0 stream 0 0 0 fffff80002e55c30 0 0
"
Let me know what you want running next, maybe something more sensible, or
useful than what I just ran above :-)
Regards,
-Karl
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