Date: Tue, 24 Feb 2015 10:35:40 -0500 (EST) From: Benjamin Kaduk <kaduk@MIT.EDU> To: Brett A Wiggins <bawig1@gmail.com> Cc: freebsd-fs@freebsd.org, rmacklem@freebsd.org Subject: Re: NFS, pefs panic: vputx: neg ref cnt Message-ID: <alpine.GSO.1.10.1502241032160.3953@multics.mit.edu> In-Reply-To: <54EBE3B2.6090508@gmail.com> References: <54EBE3B2.6090508@gmail.com>
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On Mon, 23 Feb 2015, Brett A Wiggins wrote: > I am able to access the NFS share from OSX but when I try and access it > via a Linux machine I get a kernel panic. The core dump is posted below; > > http://pastebin.com/Da5bciWX > > I'm not sure how to read a core dump (I'm not a developer) but there is > a line; > > Panic: vputx: neg ref cnt This particular panic ~always means "programmer error". Looking at the backtrace: KDB: stack backtrace: #0 0xffffffff80963000 at kdb_backtrace+0x60 #1 0xffffffff80928125 at panic+0x155 #2 0xffffffff809c8b75 at vputx+0x2d5 #3 0xffffffff8195b3fb at pefs_reclaim+0xdb #4 0xffffffff80e439a7 at VOP_RECLAIM_APV+0xa7 #5 0xffffffff809c9951 at vgonel+0x1c1 #6 0xffffffff809c9de9 at vrecycle+0x59 #7 0xffffffff8195b317 at pefs_inactive+0x87 #8 0xffffffff80e43897 at VOP_INACTIVE_APV+0xa7 #9 0xffffffff809c8722 at vinactive+0x102 #10 0xffffffff809c8b12 at vputx+0x272 #11 0xffffffff808811ee at nfsrvd_readdirplus+0x117e #12 0xffffffff80863d9e at nfsrvd_dorpc+0x6de #13 0xffffffff80872d94 at nfssvc_program+0x554 #14 0xffffffff80b27957 at svc_run_internal+0xc77 #15 0xffffffff80b26bee at svc_run+0x1de #16 0xffffffff8087321a at nfsrvd_nfsd+0x1ca #17 0xffffffff80883417 at nfssvc_nfsd+0x107 It seems that both NFS and PEFS are calling vputx on the same vnode. Given the popularity of NFS, I would be more inclined to suspect PEFS than NFS, but it could still be a bug that only appears when both are used together. Adding rmacklem to the cc list since he's the resident NFS expert. -Ben
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