Date: Sun, 6 Dec 2015 18:51:36 +0100 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Konstantin Belousov <kostikbel@gmail.com> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: panic: vm_fault: fault on nofault entry, addr: fffffe00873d8000 Message-ID: <20151206185136.2ff4f519@fabiankeil.de> In-Reply-To: <20151206165912.GF2202@kib.kiev.ua> References: <20151206114532.73b1dac9@fabiankeil.de> <20151206165912.GF2202@kib.kiev.ua>
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Konstantin Belousov <kostikbel@gmail.com> wrote:
> On Sun, Dec 06, 2015 at 11:45:32AM +0100, Fabian Keil wrote:
> > I got the following panic while trying to import a ZFS pool from a
> > geli-encrypted memory disk backed by a file located on a msdosfs partit=
ion: =20
> I smiled.
I occasionally use this somewhat non-standard setup to store redundant
backups on a media player whose bootloader may not be prepared to deal
with multiple partitions ...
> > (kgdb) where
> > #0 doadump (textdump=3D0) at pcpu.h:221
> > #1 0xffffffff80314c1b in db_dump (dummy=3D<value optimized out>, dummy=
2=3Dfalse, dummy3=3D0, dummy4=3D0x0) at /usr/src/sys/ddb/db_command.c:533
> > #2 0xffffffff80314a0e in db_command (cmd_table=3D0x0) at /usr/src/sys/=
ddb/db_command.c:440
> > #3 0xffffffff803147a4 in db_command_loop () at /usr/src/sys/ddb/db_com=
mand.c:493
> > #4 0xffffffff803172ab in db_trap (type=3D<value optimized out>, code=
=3D0) at /usr/src/sys/ddb/db_main.c:251
> > #5 0xffffffff805dfe33 in kdb_trap (type=3D3, code=3D0, tf=3D<value opt=
imized out>) at /usr/src/sys/kern/subr_kdb.c:654
> > #6 0xffffffff80879bc7 in trap (frame=3D0xfffffe009444a240) at /usr/src=
/sys/amd64/amd64/trap.c:549
> > #7 0xffffffff8085eb77 in calltrap () at /usr/src/sys/amd64/amd64/excep=
tion.S:234
> > #8 0xffffffff805df51b in kdb_enter (why=3D0xffffffff8096c7fb "panic", =
msg=3D0x32 <Address 0x32 out of bounds>) at cpufunc.h:63
> > #9 0xffffffff8059bbdf in vpanic (fmt=3D<value optimized out>, ap=3D<va=
lue optimized out>) at /usr/src/sys/kern/kern_shutdown.c:750
> > #10 0xffffffff8059ba33 in panic (fmt=3D0x0) at /usr/src/sys/kern/kern_s=
hutdown.c:688
> > #11 0xffffffff8082ffb5 in vm_fault_hold (map=3D<value optimized out>, v=
addr=3D<value optimized out>, fault_type=3D<value optimized out>, fault_fla=
gs=3D<value optimized out>, m_hold=3D<value optimized out>)
> > at /usr/src/sys/vm/vm_fault.c:332
> > #12 0xffffffff8082de18 in vm_fault (map=3D0xfffff80002000000, vaddr=3D<=
value optimized out>, fault_type=3D2 '\002', fault_flags=3D0) at /usr/src/s=
ys/vm/vm_fault.c:277
> > #13 0xffffffff8087a33a in trap_pfault (frame=3D0xfffffe009444a8e0, user=
mode=3D0) at /usr/src/sys/amd64/amd64/trap.c:734
> > #14 0xffffffff80879bde in trap (frame=3D0xfffffe009444a8e0) at /usr/src=
/sys/amd64/amd64/trap.c:435
> > #15 0xffffffff8085eb77 in calltrap () at /usr/src/sys/amd64/amd64/excep=
tion.S:234
> > #16 0xffffffff80877d5a in bcopy () at /usr/src/sys/amd64/amd64/support.=
S:118
> > #17 0xffffffff805f64e8 in uiomove_faultflag (cp=3D<value optimized out>=
, n=3D<value optimized out>, uio=3D0xfffffe009444aae0, nofault=3D<value opt=
imized out>) at /usr/src/sys/kern/subr_uio.c:208
> > #18 0xffffffff8046236f in msdosfs_read (ap=3D<value optimized out>) at =
/usr/src/sys/fs/msdosfs/msdosfs_vnops.c:596
> > #19 0xffffffff808feb20 in VOP_READ_APV (vop=3D<value optimized out>, a=
=3D<value optimized out>) at vnode_if.c:930
> > #20 0xffffffff8039bf3a in mdstart_vnode (sc=3D0xfffff8004c7ce000, bp=3D=
0xfffff80028fc81f0) at vnode_if.h:384 =20
> From the frame 20, do 'p *bp' in kgdb and mail the result. Do you have
> any non-standard values for buffer cache knobs, esp. for MAXPHYS ?
(kgdb) p *bp
$1 =3D {bio_cmd =3D 1 '\001', bio_flags =3D 16 '\020', bio_cflags =3D 0 '\0=
', bio_pflags =3D 0 '\0', bio_dev =3D 0x0, bio_disk =3D 0x0, bio_offset =3D=
0, bio_bcount =3D 0,=20
bio_data =3D 0xfffffe0077d94000 <Address 0xfffffe0077d94000 out of bounds=
>, bio_ma =3D 0xfffff8000275bc00, bio_ma_offset =3D 960, bio_ma_n =3D 33, b=
io_error =3D 0, bio_resid =3D 0,=20
bio_done =3D 0xffffffff804e51d0 <g_std_done>, bio_driver1 =3D 0x0, bio_dr=
iver2 =3D 0x0, bio_caller1 =3D 0x0, bio_caller2 =3D 0x0, bio_queue =3D {tqe=
_next =3D 0x0, tqe_prev =3D 0xfffff8004c7ce018}, bio_attribute =3D 0x0,=20
bio_from =3D 0xfffff80010131d80, bio_to =3D 0xfffff800694f2a00, bio_lengt=
h =3D 131072, bio_completed =3D 0, bio_children =3D 0, bio_inbed =3D 0, bio=
_parent =3D 0xfffff8000628bd90, bio_t0 =3D {sec =3D 33029,=20
frac =3D 13163670047247984455}, bio_task =3D 0, bio_task_arg =3D 0x0, b=
io_classifier1 =3D 0x0, bio_classifier2 =3D 0x0, bio_pblkno =3D 0}
=20
I don't use non-standard values for MAXPHYS or other buffer cache settings.
Fabian
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