xref: /freebsd/usr.sbin/crashinfo/crashinfo.8 (revision 19261079b74319502c6ffa1249920079f0f69a72)
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28.\" $FreeBSD$
29.\"
30.Dd December 2, 2020
31.Dt CRASHINFO 8
32.Os
33.Sh NAME
34.Nm crashinfo
35.Nd "analyze a core dump of the operating system"
36.Sh SYNOPSIS
37.Nm
38.Op Fl d Ar crashdir
39.Op Fl n Ar dumpnr
40.Op Fl k Ar kernel
41.Op Ar core
42.Sh DESCRIPTION
43The
44.Nm
45utility analyzes a core dump saved by
46.Xr savecore 8 .
47It generates a text file containing the analysis in the same directory as
48the core dump.
49For a given core dump file named
50.Pa vmcore.XX
51the generated text file will be named
52.Pa core.txt.XX .
53.Pp
54By default,
55.Nm
56analyzes the most recent core dump in the core dump directory.
57A specific core dump may be specified via either the
58.Ar core
59or
60.Ar dumpnr
61arguments.
62Once
63.Nm
64has located a core dump,
65it analyzes the core dump to determine the exact version of the kernel
66that generated the core.
67It then looks for a matching kernel file under each of the subdirectories in
68.Pa /boot .
69The location of the kernel file can also be explicitly provided via the
70.Ar kernel
71argument.
72.Pp
73Once
74.Nm
75has located a core dump and kernel,
76it uses several utilities to analyze the core including
77.Xr dmesg 8 ,
78.Xr fstat 1 ,
79.Xr iostat 8 ,
80.Xr ipcs 1 ,
81.Xr kgdb 1 ,
82.Xr netstat 1 ,
83.Xr nfsstat 1 ,
84.Xr ps 1 ,
85.Xr pstat 8 ,
86and
87.Xr vmstat 8 .
88Note that kgdb must be installed from the devel/gdb port or gdb package.
89.Pp
90The options are as follows:
91.Bl -tag -width indent
92.It Fl b
93Run in batch mode.
94Write most messages to the
95.Pa core.txt.XX
96file instead of the terminal.
97This flag is used when
98.Nm
99is run during boot.
100.It Fl d Ar crashdir
101Specify an alternate core dump directory.
102The default crash dump directory is
103.Pa /var/crash .
104.It Fl n Ar dumpnr
105Use the core dump saved in
106.Pa vmcore. Ns Ar dumpnr
107instead of the latest core in the core dump directory.
108.It Fl k Ar kernel
109Specify an explicit kernel file.
110.El
111.Sh SEE ALSO
112.Xr textdump 4 ,
113.Xr savecore 8
114.Sh HISTORY
115The
116.Nm
117utility appeared in
118.Fx 6.4 .
119