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c":753, 0xfffffc00003c4ae4]
1 panic(s = 0xfffffc000044b618 = "mode = 0%o, inum = %d, pref = %d fs = %s\n")\
["../../../../src/kernel/bsd/subr_prf.c":1119, 0xfffffc00002bdbb0]
2 ialloc(pip = 0xffffffff8c6acc40, ipref = 57664, mode = 0, ipp = 0xffffffff8c\
f95af8) ["../../../../src/kernel/ufs/ufs_alloc.c":501, 0xfffffc00002dab48]
3 maknode(vap = 0xffffffff8cf95c50, ndp = 0xffffffff8cf922f8, ipp = 0xffffffff\
8cf95b60) ["../../../../src/kernel/ufs/ufs_vnops.c":2842, 0xfffffc00002ea500]
4 ufs_create(ndp = 0xffffffff8cf922f8, vap = 0xfffffc00002fe0a0) ["../../../..\
/src/kernel/ufs/ufs_vnops.c":602, 0xfffffc00002e771c]
5 vn_open(ndp = 0xffffffff8cf95d18, fmode = 4618, cmode = 416) ["../../../../s\
rc/kernel/vfs/vfs_vnops.c":258, 0xfffffc00002fe138]
6 copen(p = 0xffffffff8c6efba0, args = 0xffffffff8cf95e50, retval = 0xffffffff\
8cf95e40, compat = 0) ["../../../../src/kernel/vfs/vfs_syscalls.c":1379, 0xfffffc\
00002fb890]
7 open(p = 0xffffffff8cf95e40, args = (nil), retval = 0x7f4) ["../../../../src\
/kernel/vfs/vfs_syscalls.c":1340, 0xfffffc00002fb7bc]
8 syscall(ep = 0xffffffff8cf95ef8, code = 45) ["../../../../src/kernel/arch/al\
pha/syscall_trap.c":532, 0xfffffc00003cfa34]
9 _Xsyscall() ["../../../../src/kernel/arch/alpha/locore.s":703, 0xfffffc00003\
c31e0]
(dbx)
q
1 Display the panic string (panicstr). The panic string shows that the
ialloc function called the panic function.
2 Perform a stack trace. This confirms that the ialloc function at line
501 in file ufs_alloc.c called the panic function.
4.2.2 Using kdbx to Determine the Cause of a Software Panic
The following example shows a method of finding a software panic with the
kdbx debugger:
# kdbx -k vmunix.3 vmzcore.3
dbx version 5.0
Type ’help’ for help.
stopped at [boot:753 ,0xfffffc00003c4b04] Source not available
(kdbx) sum
1
Hostname : system.dec.com
cpu: Digital AlphaStation 600 5/266 avail: 1
Boot-time: Tue Oct 6 15:16:41 1998
Time: Tue Oct 27 13:52:11 1998
Kernel : OSF1 release V5.0 version 688.2 (alpha)
(kdbx) p panicstr
2
0xfffffc0000453ea0 = "wdir: compact2"
(kdbx) t
3
> 0 boot(paniced = 0, arghowto = 0) ["../../../../src/kernel/arch/alpha/machdep\
.c":753, 0xfffffc00003c4b04]
1 panic(s = 0xfffffc00002e0938 = "p") ["../../../../src/kernel/bsd/subr_prf.c"\
:1119, 0xfffffc00002bdbb0]
2 direnter(ip = 0xffffffff00000000, ndp = 0xffffffff9d38db60) ["../../../../sr\
c/kernel/ufs/ufs_lookup.c":986, 0xfffffc00002e2adc]
3 ufs_mkdir(ndp = 0xffffffff9d38a2f8, vap = 0x100000020) ["../../../../src/ker\
nel/ufs/ufs_vnops.c":2383, 0xfffffc00002e9cbc]
4 mkdir(p = 0xffffffff9c43d7c0, args = 0xffffffff9d38de50, retval = 0xffffffff\
9d38de40) ["../../../../src/kernel/vfs/vfs_syscalls.c":2579, 0xfffffc00002fd930]
5 syscall(ep = 0xffffffff9d38def8, code = 136) ["../../../../src/kernel/arch/a\
lpha/syscall_trap.c":532, 0xfffffc00003cfa54]
6 _Xsyscall() ["../../../../src/kernel/arch/alpha/locore.s":703, 0xfffffc00003\
Crash Analysis Examples 4–3