Deadlock, exclusive sx so_rcv_sx, amd64
Gleb Kozyrev
gkozyrev at gmail.com
Fri Oct 26 03:17:52 PDT 2007
On 25/10/2007, John Baldwin <jhb at freebsd.org> wrote:
> > Running rtorrent and ftp brings my system to a deadlock
> > in a few hours. Kernel still responds to pings and sends some
> > TCP acks.
...
> > Please suggest any other commands to run in DDB if needed.
> > Cores are saved.
>
> show sleepchain <pid> will show if it's a real deadlock or not.
>
This time the freeze was a matter of minutes.
db> ps
pid ppid pgrp uid state wmesg wchan cmd
1229 991 991 0 ? smbd
1201 1195 1201 1001 SL+ pfault 0xffffffff80b1359c rtorrent
1199 1193 1199 1001 Ss+ ttyin 0xffffff0001211410 tcsh
1197 1193 1197 1001 Ss+ ttyin 0xffffff0001218810 tcsh
1195 1193 1195 1001 Ss+ pause 0xffffff000624a0c0 tcsh
1193 1192 1193 1001 SLs pfault 0xffffffff80b1359c screen
1192 1190 1190 1001 S+ pause 0xffffff00013c10c0 screen
1190 1189 1190 1001 Ss+ pause 0xffffff00065b40c0 tcsh
1189 1187 1187 1001 S select 0xffffffff80af79d0 sshd
1187 1097 1187 0 Ss sbwait 0xffffff00065346cc sshd
...
db> show alllocks
Process 1187 (sshd) thread 0xffffff00065ad350 (100166)
exclusive sx so_rcv_sx r = 0 (0xffffff0006534670) locked @
/usr/src/sys/kern/uipc_sockbuf.c:145
db> show sleepchain 1187
thread 100166 (pid 1187, sshd) sleeping on 0xffffff00065346cc "sbwait"
db> show sleepchain 1201
thread 100164 (pid 1201, rtorrent) sleeping on 0xffffffff80b1359c "pfault"
Nothing interesting I guess...
Maybe this is not a deadlock, what else can cause such a freeze?
I won't reboot it for a while -- maybe someone can suggest anything else.
--
With best regards, Gleb Kozyrev.
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