Date: Tue, 8 Dec 2020 10:48:29 -0500 From: Mark Johnston <markj@freebsd.org> To: Kyle Evans <kevans@freebsd.org> Cc: Peter Holm <pho@freebsd.org>, current <current@freebsd.org> Subject: Re: panic: general protection fault from uipc_sockaddr+0x4c Message-ID: <X8%2BgTfsqOCxld3yl@raichu> In-Reply-To: <CACNAnaG_8iSUqc3pnmV-DMFQ_%2BQ%2BbSDbYA8X3pz743rRGUtT9A@mail.gmail.com> References: <20201208114718.GA33199@x8.osted.lan> <X8%2BcIUFKzzOSnl4L@raichu> <CACNAnaG_8iSUqc3pnmV-DMFQ_%2BQ%2BbSDbYA8X3pz743rRGUtT9A@mail.gmail.com>
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On Tue, Dec 08, 2020 at 09:39:05AM -0600, Kyle Evans wrote: > On Tue, Dec 8, 2020 at 9:30 AM Mark Johnston <markj@freebsd.org> wrote: > > kern_proc_filedesc_out() holds the fdtable shared lock thoughout all of > > this, which is supposed to prevent the table entry from being freed > > since that requires the exclusive lock. > > > > export_file_to_sb drops the lock without it or kern_proc_filedesc_out > holding the file it's about to look at, though. Yes, but that's after it calls fo_fill_kinfo(). At that point it has already collected the to-be-exported info in an sbuf.
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