Date: Mon, 08 Nov 2010 11:17:07 +0200 From: Andriy Gapon <avg@freebsd.org> To: jhell <jhell@DataIX.net> Cc: Alan Cox <alc@freebsd.org>, Pawel Jakub Dawidek <pjd@freebsd.org>, freebsd-fs@freebsd.org Subject: Re: vop_getpages for zfs Message-ID: <4CD7C013.8010502@freebsd.org> In-Reply-To: <4CD48259.6030402@DataIX.net> References: <4C91F031.1010801@freebsd.org> <20101010134717.GA59922@deviant.kiev.zoral.com.ua> <4CD2E5AA.1090208@freebsd.org> <4CD48259.6030402@DataIX.net>
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on 06/11/2010 00:16 jhell said the following: > Thought I would give you a heads up on this after seeing the post about > zfs_getpages.diff. > > I patched up to this before after seeing it posted to <you_know_where>@ > and got reliable dumpage from it. Basically a vm_page_unwire fault or > something like that. I believe the following is the backtrace from that. > > (kgdb) #0 doadump () at pcpu.h:231 > #1 0x80675251 in boot (howto=260) at /usr/src/sys/kern/kern_shutdown.c:419 > #2 0x806754e5 in panic (fmt=Variable "fmt" is not available. > ) at /usr/src/sys/kern/kern_shutdown.c:592 > #3 0x808e27ce in vm_page_unwire (m=0x816b46e0, activate=1) > at /usr/src/sys/vm/vm_page.c:1564 > #4 0x808d123a in vm_fault_unwire (map=0x81690088, start=2568372224, > end=2568433664, fictitious=0) at /usr/src/sys/vm/vm_fault.c:1123 > #5 0x808d8a33 in vm_map_delete (map=0x81690088, start=2568372224, > end=2568433664) at /usr/src/sys/vm/vm_map.c:2619 > #6 0x808d8d0d in vm_map_remove (map=0x81690088, start=2568372224, > end=Variable "end" is not available. > ) > at /usr/src/sys/vm/vm_map.c:2801 > #7 0x808d6360 in kmem_free (map=0x81690088, addr=2568372224, size=61440) > at /usr/src/sys/vm/vm_kern.c:211 > #8 0x808cb601 in page_free (mem=0x99164000, size=61440, flags=34 '"') > at /usr/src/sys/vm/uma_core.c:1069 > #9 0x808ccf92 in uma_large_free (slab=0x85be7e6c) > at /usr/src/sys/vm/uma_core.c:3021 > #10 0x8065f7a5 in free (addr=0x99164000, mtp=0x80d8e114) > at /usr/src/sys/kern/kern_malloc.c:506 > #11 0x80cd49db in zil_lwb_write_done () from /boot/kernel/zfs.ko > #12 0x80cd99b1 in zio_done () from /boot/kernel/zfs.ko > #13 0x80cd7d3a in zio_execute () from /boot/kernel/zfs.ko > #14 0x80cd7f2e in zio_notify_parent () from /boot/kernel/zfs.ko > #15 0x80cd9a31 in zio_done () from /boot/kernel/zfs.ko > #16 0x80cd7d3a in zio_execute () from /boot/kernel/zfs.ko > #17 0x80c6656b in taskq_run_safe () from /boot/kernel/zfs.ko > #18 0x806af812 in taskqueue_run (queue=0x85a0ac40) > at /usr/src/sys/kern/subr_taskqueue.c:239 > #19 0x806afa07 in taskqueue_thread_loop (arg=0x85a3f830) > at /usr/src/sys/kern/subr_taskqueue.c:360 > #20 0x80647377 in fork_exit (callout=0x806af94a <taskqueue_thread_loop>, > arg=0x85a3f830, frame=0xb4439d38) at /usr/src/sys/kern/kern_fork.c:845 > #21 0x809126a4 in fork_trampoline () at > /usr/src/sys/i386/i386/exception.s:273 > (kgdb) > > And that coincided with the dates that I added the patch once seeing it > on the list. > changeset: 351:f1ca4eb51520 > user: J. Hellenthal <jhell@DataIX.net> > date: Sun Oct 10 22:57:24 2010 -0400 > summary: Remove the zfs_getpages patch from Andriy Gapon > > changeset: 350:bb885c047f0a > user: J. Hellenthal <jhell@DataIX.net> > date: Sun Oct 10 22:27:31 2010 -0400 > summary: zfs_getpages improvement from Andriy Gapon > > If you would like I can patch back up to this patch to provide more > information if its needed, but at the moment I do not have it available > nor do I have the core that was generated. Thanks a lot for this report. Actually the original patch/commit was intended for head only as there are some differences in page locking between head and other branches. I have almost forgot about that and would certainly do that if not for your report. See r214936 and r214941. Thanks! -- Andriy Gapon
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