Date: Fri, 26 Oct 2007 21:45:36 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: Deadlock, exclusive sx so_rcv_sx, amd64 Message-ID: <20071026184536.GE37471@deviant.kiev.zoral.com.ua> In-Reply-To: <200710261222.28656.jhb@freebsd.org> References: <ca661e8a0710211529y2a48b4a9h78da4211b3f09274@mail.gmail.com> <200710251435.58984.jhb@freebsd.org> <ca661e8a0710260252u4f5c1c3di22828143e81e3df2@mail.gmail.com> <200710261222.28656.jhb@freebsd.org>
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--vv4Sf/kQfcwinyKX Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Oct 26, 2007 at 12:22:28PM -0400, John Baldwin wrote: > On Friday 26 October 2007 05:52:07 am Gleb Kozyrev wrote: > > On 25/10/2007, John Baldwin <jhb@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. > > > > >=20 > > This time the freeze was a matter of minutes. > >=20 > > 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 > > ... > >=20 > > db> show alllocks > > Process 1187 (sshd) thread 0xffffff00065ad350 (100166) > > exclusive sx so_rcv_sx r =3D 0 (0xffffff0006534670) locked @ > > /usr/src/sys/kern/uipc_sockbuf.c:145 > >=20 > > 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 "pfau= lt" > >=20 > > 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 els= e. >=20 > "sbwait" is waiting for data to come in on a socket and "pfault" is > waiting on disk I/O. It is a bit odd that 1187 is holding a lock while No, pfault means that the process handles page faults, and sleeps waiting for some page to become available (either from cache or free list). > sleeping though that is permitted with an sx lock. Still, if it's > supposed to be protect socket's receive buffer that is odd. Maybe get > a trace of the process blocked in "sbwait" (tr <pid>) and bug rwatson@ > about it. --vv4Sf/kQfcwinyKX Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFHIjXPC3+MBN1Mb4gRAgmSAKDpuxX5/t07+T1q0jKFV0ybA31mMwCdH3U4 x4TF3cRgX339ll6QGz99KDg= =dcSK -----END PGP SIGNATURE----- --vv4Sf/kQfcwinyKX--
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