Date: Tue, 19 Mar 2013 19:37:43 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Andriy Gapon <avg@FreeBSD.org> Cc: Jeremy Chadwick <jdc@koitsu.org>, Michael Landin Hostbaek <mich@FreeBSD.org>, freebsd-stable@FreeBSD.org, John Baldwin <jhb@FreeBSD.org> Subject: Re: Core Dump / panic sleeping thread Message-ID: <153890828.4081736.1363736263509.JavaMail.root@erie.cs.uoguelph.ca> In-Reply-To: <5148A454.1080303@FreeBSD.org>
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------=_Part_4081735_1266366528.1363736263504 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Andriy Gapon wrote: > on 19/03/2013 19:35 Jeremy Chadwick said the following: > > On Tue, Mar 19, 2013 at 06:18:06PM +0100, Michael Landin Hostbaek > > wrote: > [snip] > >> Unread portion of the kernel message buffer: > >> Sleeping thread (tid 100256, pid 85641) owns a non-sleepable lock > >> KDB: stack backtrace of thread 100256: > >> #0 0xffffffff808f2d46 at mi_switch+0x186 > >> #1 0xffffffff8092bb52 at sleepq_wait+0x42 > >> #2 0xffffffff808f34d6 at _sleep+0x376 > >> #3 0xffffffff80b4f3ae at vm_object_page_remove+0x2ce > >> #4 0xffffffff80b5ac7d at vnode_pager_setsize+0x17d > >> #5 0xffffffff8082102c at nfscl_loadattrcache+0x2cc > >> #6 0xffffffff80818d37 at nfs_getattr+0x287 > >> #7 0xffffffff8098f1c0 at vn_stat+0xb0 > >> #8 0xffffffff809869d9 at kern_statat_vnhook+0xf9 > >> #9 0xffffffff80986b55 at kern_statat+0x15 > >> #10 0xffffffff80986c1a at sys_lstat+0x2a > >> #11 0xffffffff80bd7ae6 at amd64_syscall+0x546 > >> #12 0xffffffff80bc3447 at Xfast_syscall+0xf7 > >> panic: sleeping thread > >> cpuid = 0 > >> KDB: stack backtrace: > >> #0 0xffffffff809208a6 at kdb_backtrace+0x66 > >> #1 0xffffffff808ea8be at panic+0x1ce > >> #2 0xffffffff8092ed22 at propagate_priority+0x1d2 > >> #3 0xffffffff8092fa4e at turnstile_wait+0x1be > >> #4 0xffffffff808d8d48 at _mtx_lock_sleep+0xd8 > >> #5 0xffffffff80820fa4 at nfscl_loadattrcache+0x244 > >> #6 0xffffffff8081758c at ncl_readrpc+0xac > >> #7 0xffffffff80824c45 at ncl_getpages+0x485 > >> #8 0xffffffff80b5aa0c at vnode_pager_getpages+0x9c > >> #9 0xffffffff80b3fc93 at vm_fault_hold+0x673 > >> #10 0xffffffff80b41cc3 at vm_fault+0x73 > >> #11 0xffffffff80bd84b4 at trap_pfault+0x124 > >> #12 0xffffffff80bd8c6c at trap+0x49c > >> #13 0xffffffff80bc315f at calltrap+0x8 > [snip] > > I think that the regular mutex which is acquired via NFSLOCKNODE() in > nfscl_loadattrcache() can not be held across vnode_pager_setsize. > I am not sure though when vap->va_size != np->n_size case is > triggered. > Yep, I'd agree to that. The same bug is in the old NFS client and the new NFS client cribbed the code from there. I have attached a simple patch that unlocks the mutex for the vnode_pager_setsize() call. Maybe you could test it? Thanks for reporting this, rick ps: Hopefully "patch" can apply this patch (there have been recent changes to this file, so the line#s could be off). It should be easy to do manually if not. The change is in nfscl_loadattrcache() in sys/fs/nfsclient/nfs_clport.c. > > You're going to need to provide the following details: > > > > 1. Contents of /etc/rc.conf > > 2. Contents of /etc/sysctl.conf (if modified) > > 3. Contents of /etc/fstab > > 4. ifconfig -a > > 5. OS used by the NFS server, and all configuration details > > pertaining > > to that system > > > > You may also be asked to upgrade to 9.1-STABLE, as there may be > > fixes > > for whatever this is in base/stable/9 that are not in -RELEASE, but > > this > > is speculative on my part. > > > I do not see a need for any of these. > > -- > Andriy Gapon > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to > "freebsd-stable-unsubscribe@freebsd.org" ------=_Part_4081735_1266366528.1363736263504 Content-Type: text/x-patch; name=loadattrcache.patch Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename=loadattrcache.patch LS0tIGZzL25mc2NsaWVudC9uZnNfY2xwb3J0LmMuc2F2aXQJMjAxMy0wMy0xOSAxODozNzozMy4w MDAwMDAwMDAgLTA0MDAKKysrIGZzL25mc2NsaWVudC9uZnNfY2xwb3J0LmMJMjAxMy0wMy0xOSAx ODo0NDoyMS4wMDAwMDAwMDAgLTA0MDAKQEAgLTQ0NCw3ICs0NDQsOSBAQCBuZnNjbF9sb2FkYXR0 cmNhY2hlKHN0cnVjdCB2bm9kZSAqKnZwcCwgCiAJCQkJbnAtPm5fc2l6ZSA9IHZhcC0+dmFfc2l6 ZTsKIAkJCQlucC0+bl9mbGFnIHw9IE5TSVpFQ0hBTkdFRDsKIAkJCX0KKwkJCU5GU1VOTE9DS05P REUobnApOwogCQkJdm5vZGVfcGFnZXJfc2V0c2l6ZSh2cCwgbnAtPm5fc2l6ZSk7CisJCQlORlNM T0NLTk9ERShucCk7CiAJCX0gZWxzZSB7CiAJCQlucC0+bl9zaXplID0gdmFwLT52YV9zaXplOwog CQl9Cg== ------=_Part_4081735_1266366528.1363736263504--
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