Date: Sun, 21 Jun 2009 21:21:34 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Kris Kennaway <kris@FreeBSD.org> Cc: Doug Rabson <dfr@FreeBSD.org>, current@FreeBSD.org, John Baldwin <jhb@FreeBSD.org>, pav@FreeBSD.org, freebsd-current@FreeBSD.org, Kip Macy <kmacy@FreeBSD.org> Subject: Re: hang in rpccon from interrupting NFS operations (Re: pointyhat panic) Message-ID: <Pine.GSO.4.63.0906212119310.2430@muncher.cs.uoguelph.ca> In-Reply-To: <4A3E234F.6050403@FreeBSD.org> References: <1242075474.72992.118.camel@hood.oook.cz> <3c1674c90906151408n6febec56m140b089b694f6e13@mail.gmail.com> <20090616073353.GZ33280@droso.net> <200906160812.04284.jhb@freebsd.org> <4A3E234F.6050403@FreeBSD.org>
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On Sun, 21 Jun 2009, Kris Kennaway wrote: > > Got another deadlock after upgrading. Again, busy NFS volume, and ^C'ing a > recursive find hung in rpccon state: > > db> bt 89596 > Tracing pid 89596 tid 102493 td 0xffffff0089260000 > sched_switch() at sched_switch+0x17c > mi_switch() at mi_switch+0x21d > sleepq_switch() at sleepq_switch+0x123 > sleepq_timedwait() at sleepq_timedwait+0x4d > _sleep() at _sleep+0x301 > clnt_reconnect_call() at clnt_reconnect_call+0x5d3 > nfs_request() at nfs_request+0x225 > nfs_statfs() at nfs_statfs+0x197 > __vfs_statfs() at __vfs_statfs+0x28 > kern_fstatfs() at kern_fstatfs+0x286 > fstatfs() at fstatfs+0x34 > syscall() at syscall+0x1af > Xfast_syscall() at Xfast_syscall+0xd0 > --- syscall (397, FreeBSD ELF64, fstatfs), rip = 0x800726dcc, rsp = > 0x7fffffffe1a8, rbp = 0x1000 --- > > These are mounted with intr, I'll try disabling that next. > There are two sleeps in clnt_rc.c. One of them optionally does a PCATCH and returns when interrupted via ^C, but the other one (which it is sleeping on above), doesn't. I've emailed Kris a small patch that changes that for him to test. If anyone else wants to test the patch, just email me for a copy, rick
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