Re: panic in sys_fstatat (?)

On Mon, Feb 02, 2015 at 01:10:47PM -0500, Eric van Gyzen wrote:
> On 02/02/2015 12:59, Steve Kargl wrote:
> > (kgdb) #0  doadump (textdump=Unhandled dwarf expression opcode 0x93
> > ) at pcpu.h:219
> > #1  0xffffffff80559f47 in kern_reboot (howto=260)
> >     at /usr/src/sys/kern/kern_shutdown.c:448
> > #2  0xffffffff8055a3b0 in panic (fmt=<value optimized out>)
> >     at /usr/src/sys/kern/kern_shutdown.c:747
> > #3  0xffffffff807a85c0 in trap_fatal (frame=<value optimized out>, 
> >     eva=<value optimized out>) at /usr/src/sys/amd64/amd64/trap.c:861
> > #4  0xffffffff807a8221 in trap (frame=<value optimized out>)
> >     at /usr/src/sys/amd64/amd64/trap.c:201
> > #5  0xffffffff8078d843 in calltrap ()
> >     at /usr/src/sys/amd64/amd64/exception.S:235
> > #6  0xffffffff80754567 in ufs_getattr (ap=<value optimized out>)
> >     at /usr/src/sys/ufs/ufs/ufs_vnops.c:463
> > #7  0xffffffff808074fa in VOP_GETATTR_APV (vop=<value optimized out>, 
> >     a=<value optimized out>) at vnode_if.c:731
> > #8  0xffffffff80607e62 in vn_stat (vp=0xfffff80088086000, 
> >     sb=0xfffffe0469290710, active_cred=0xfffff8000b07d800, file_cred=0x1, 
> >     td=0xfffff801b5063000) at vnode_if.h:309
> > #9  0xffffffff806017e4 in kern_statat (td=0xfffff801b5063000, 
> >     flag=<value optimized out>, fd=<value optimized out>, 
> >     path=<value optimized out>, pathseg=UIO_USERSPACE, 
> >     sbp=0xfffffe04692908a0, hook=0xfefff80034ba0700)
> >     at /usr/src/sys/kern/vfs_syscalls.c:2241
> > #10 0xffffffff80601acc in sys_fstatat (td=0xfffff802dbc03dc8, 
> >     uap=0xfffffe04692909c0) at /usr/src/sys/kern/vfs_syscalls.c:2215
> > #11 0xffffffff807a8db9 in amd64_syscall (td=0xfffff801b5063000, traced=0)
> >     at subr_syscall.c:133
> > #12 0xffffffff8078db2b in Xfast_syscall ()
> >     at /usr/src/sys/amd64/amd64/exception.S:395
> 
> I probably can't help debug this, but someone who _can_ will likely ask
> for this from kgdb:
> 
> f 6
> x/i $rip
> info reg

(kgdb) f 6
#6  0xffffffff80754567 in ufs_getattr (ap=<value optimized out>)
    at /usr/src/sys/ufs/ufs/ufs_vnops.c:463
463                     vap->va_atime.tv_sec = ip->i_din2->di_atime;
(kgdb) x/i $rip
0xffffffff80754567 <ufs_getattr+135>:   mov    0x20(%rax),%rax
(kgdb) info reg
rax            0xfefff80034ba0700       -72066389246343424
rbx            0xfffff802dbc03dc8       -8783816278584
rcx            0x1      1
rdx            0xfffff8000b07d800       -8795907958784
rsi            0xfffffe0469290688       -2180079090040
rdi            0xfffff802dbc03dc8       -8783816278584
rbp            0xfffffe04692905a0       0xfffffe04692905a0
rsp            0xfffffe0469290570       0xfffffe0469290570
r8             0xfffff801b5063000       -8788760973312
r9             0x33     51
r10            0x0      0
r11            0x0      0
r12            0xfffff801b5063000       -8788760973312
r13            0xfffffe04692905e0       -2180079090208
r14            0xfffff80088086000       -8793810771968
r15            0xfffff800880860b0       -8793810771792
rip            0xffffffff80754567       0xffffffff80754567 <ufs_getattr+135>
eflags         0x10202  66050
cs             0x20     32
ss             0x28     40
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0

-- 
Steve