Date: Wed, 8 Apr 2020 03:03:24 +0200 From: Hans Petter Selasky <hps@selasky.org> To: Mark Johnston <markj@freebsd.org>, Eric Joyner <erj@freebsd.org> Cc: 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: <2220ccb5-7c32-bf90-b50c-42f60fb94ace@selasky.org> In-Reply-To: <20200407232347.GA5605@raichu> References: <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> <CA%2Bb0zg-JM1rjO_OPh16sgM3Hm2hbzePNaW5bcxiL9aOpJ_vsOA@mail.gmail.com> <20200407232347.GA5605@raichu>
next in thread | previous in thread | raw e-mail | index | archive | help
On 2020-04-08 01:23, Mark Johnston wrote: > On Mon, Apr 06, 2020 at 02:34:50PM -0700, Eric Joyner wrote: >> 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 > > I spent some time looking at the core. It looks like we have yet > another problem: the gtaskqueue code won't exit the net epoch if it is > constantly running a net task. Could you please retry with the patches > from before, and this one included? > There is the same issue in kern_intr.c (FYI). --HPS
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?2220ccb5-7c32-bf90-b50c-42f60fb94ace>