Date: Mon, 6 Apr 2020 14:34:50 -0700 From: Eric Joyner <erj@freebsd.org> To: Mark Johnston <markj@freebsd.org> Cc: Hans Petter Selasky <hps@selasky.org>, freebsd-net@freebsd.org, shurd <shurd@freebsd.org>, John Baldwin <jhb@freebsd.org>, Drew Gallatin <gallatin@netflix.com> Subject: Re: Issue with epoch_drain_callbacks and unloading iavf(4) [using iflib] Message-ID: <CA%2Bb0zg-JM1rjO_OPh16sgM3Hm2hbzePNaW5bcxiL9aOpJ_vsOA@mail.gmail.com> In-Reply-To: <20200406212903.GA55712@raichu> References: <20200130030911.GA15281@spy> <CA%2Bb0zg-1CQ81dsNGv_O3ebLLko6Piei0A1NCPZUT5JH8EOyntw@mail.gmail.com> <CA%2Bb0zg809EGMS1Ngr38BSb1yNpDqxbCnAv9eC%2BcDwbMQ5t%2BqXQ@mail.gmail.com> <20200212222219.GE83892@raichu> <CAKdFRZjdiz_axuweksNUHis7jPKXHqOmhQg%2BQWzpVnsKY%2Bcrmg@mail.gmail.com> <20200328225150.GA82767@raichu> <CAKdFRZgm43LmjJ9dYDBGM8EV0ePRMLPr4YW_tPELANXQGpqpCA@mail.gmail.com> <CA%2Bb0zg_k=8nMhapa=T=yTcSJcUrrnG=AfQB%2Be0gPcCrgkbWtCQ@mail.gmail.com> <20200331192024.GE97238@raichu> <CA%2Bb0zg9z7srroWLtV_poedghXjCr0GvHv95cu4JzFrRdZoaeWw@mail.gmail.com> <20200406212903.GA55712@raichu>
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On Mon, Apr 6, 2020 at 2:29 PM Mark Johnston <markj@freebsd.org> wrote: > On Mon, Apr 06, 2020 at 02:19:25PM -0700, Eric Joyner wrote: > > Mark, > > > > I think I was mistaken about the backtrace looking the same. I was > looking > > at it from within ddb, and I think I focused on the > > epoch_block_handler_preempt line and didn't notice that it only stopped > > there this time. Here's the new one I've got from kgdb: > > Thanks. Could you try to print "td->td_name" from frame 4? It should > also be available as er->er_blockedtd. Basically, I'm trying to verify > that the interrupt thread itself isn't the one that we're waiting for, > else there is another bug to be fixed. > > If you can provide kernel symbols and vmcore, I'd be happy to look at it > myself. > _______________________________________________ > freebsd-net@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" > Here's what I get: (kgdb) frame 4 #4 epoch_block_handler_preempt (global=0xfffff80003de0100, cr=0xfffffe00dee85900, arg=0x0) at /usr/src/sys/kern/subr_epoch.c:507 507 } (kgdb) print td->td_name $1 = "if_io_tqg_31\000\000\000\000\000\000\000" (kgdb) print er->er_blockedtd $2 = (struct thread *) 0x0 - Eric
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