Date: Wed, 23 Dec 2015 10:58:37 +0100 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: freebsd-fs@freebsd.org Subject: Re: ZFS:dmu_objset_find_dp_impl() - panic: vm_fault: fault on nofault entry, addr: fffffe0094653000 Message-ID: <20151223105837.53b2c1ae@fabiankeil.de> In-Reply-To: <20151222161200.19ab1832@fabiankeil.de>
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[-- Attachment #1 --] Fabian Keil <freebsd-listen@fabiankeil.de> wrote: > Using a kernel based on r292334, I got this panic while importing > a ZFS pool with vfs.zfs.spa_load_verify_data and > vfs.zfs.spa_load_verify_metadata set to 0. > > I've not been able to reproduce it yet and the changed sysctl's above > may not actually matter (but I usually use the defaults). I unintentionally reproduced it yesterday with the same kernel using the default values for the sysctls above. > The pool has a single leaf vdev that is backed by ggatec which transfers the > data over a slow and easily saturated connection (< ~120 kB/s up). Graph: > https://www.fabiankeil.de/talks/versteckter-block-speicher/mgp00030.html > > fk@r500 /usr/crash $kgdb /usr/lib/debug/boot/kernel/kernel.debug vmcore.2 > [...] > Unread portion of the kernel message buffer: > [11912] panic: vm_fault: fault on nofault entry, addr: fffffe0094653000 > [11912] cpuid = 0 > [11912] KDB: stack backtrace: > [...] > #0 doadump (textdump=0) at pcpu.h:221 > 221 pcpu.h: No such file or directory. > in pcpu.h > (kgdb) where > #0 doadump (textdump=0) at pcpu.h:221 > #1 0xffffffff8031752b in db_dump (dummy=<value optimized out>, dummy2=false, dummy3=0, dummy4=0x0) at /usr/src/sys/ddb/db_command.c:533 > #2 0xffffffff8031731e in db_command (cmd_table=0x0) at /usr/src/sys/ddb/db_command.c:440 > #3 0xffffffff803170b4 in db_command_loop () at /usr/src/sys/ddb/db_command.c:493 > #4 0xffffffff80319bbb in db_trap (type=<value optimized out>, code=0) at /usr/src/sys/ddb/db_main.c:251 > #5 0xffffffff805e2dc3 in kdb_trap (type=3, code=0, tf=<value optimized out>) at /usr/src/sys/kern/subr_kdb.c:654 > #6 0xffffffff8087f207 in trap (frame=0xfffffe0094f8f220) at /usr/src/sys/amd64/amd64/trap.c:549 > #7 0xffffffff808641b7 in calltrap () at /usr/src/sys/amd64/amd64/exception.S:234 > #8 0xffffffff805e24ab in kdb_enter (why=0xffffffff8097216b "panic", msg=0x32 <Address 0x32 out of bounds>) at cpufunc.h:63 > #9 0xffffffff8059ea4f in vpanic (fmt=<value optimized out>, ap=<value optimized out>) at /usr/src/sys/kern/kern_shutdown.c:750 > #10 0xffffffff8059e8a3 in panic (fmt=0x0) at /usr/src/sys/kern/kern_shutdown.c:688 > #11 0xffffffff80835650 in vm_fault_hold (map=<value optimized out>, vaddr=<value optimized out>, fault_type=<value optimized out>, fault_flags=<value optimized out>, m_hold=<value optimized out>) > at /usr/src/sys/vm/vm_fault.c:332 > #12 0xffffffff808332f8 in vm_fault (map=0xfffff80002000000, vaddr=<value optimized out>, fault_type=1 '\001', fault_flags=0) at /usr/src/sys/vm/vm_fault.c:277 > #13 0xffffffff8087f97a in trap_pfault (frame=0xfffffe0094f8f8d0, usermode=0) at /usr/src/sys/amd64/amd64/trap.c:734 > #14 0xffffffff8087f21e in trap (frame=0xfffffe0094f8f8d0) at /usr/src/sys/amd64/amd64/trap.c:435 > #15 0xffffffff808641b7 in calltrap () at /usr/src/sys/amd64/amd64/exception.S:234 > #16 0xffffffff81900c9a in dmu_objset_find_dp_impl (dcp=0xfffff80078cb0200) at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c:1630 > #17 0xffffffff81901189 in dmu_objset_find_dp_cb (arg=0xfffff80078cb0200) at /usr/src/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_objset.c:1746 [...] > Given the location of the trap, this could be a regression caused > by the import of illumos #5269 (zpool import slow) in r286686: > https://svnweb.freebsd.org/base?view=revision&revision=r286686 On the other hand I've never seen the issue with previous kernels and two times with the one based on r292334. I've updated to a kernel based on r292616 to see if it makes a difference (there were quite a few vm changes). Fabian [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iEYEARECAAYFAlZ6cE0ACgkQBYqIVf93VJ03xwCgv6n9yYpeREldBPZOhEPxB0+w AmwAnjnlbZyrJ7vLPwAjPWVsBW9izMzr =HlWV -----END PGP SIGNATURE-----help
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