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| author | Mitchell Horne <mhorne@FreeBSD.org> | 2020-11-19 18:03:40 +0000 |
|---|---|---|
| committer | Mitchell Horne <mhorne@FreeBSD.org> | 2020-11-19 18:03:40 +0000 |
| commit | c8a96cdcd9662bdda3686075000b6b541de3bbcc (patch) | |
| tree | 722f4c02fd6fbbf4f8b889e87c4bf3cb38a23a91 /share | |
| parent | 24d79e9b638a1fcd1b4c2568dededb6dbd66872f (diff) | |
| download | src-test2-c8a96cdcd9662bdda3686075000b6b541de3bbcc.tar.gz src-test2-c8a96cdcd9662bdda3686075000b6b541de3bbcc.zip | |
Add an option for entering KDB on recursive panics
There are many cases where one would choose avoid entering the debugger
on a normal panic, opting instead to reboot and possibly save a kernel
dump. However, recursive kernel panics are an unusual case that might
warrant attention from a human, so provide a secondary tunable,
debug.debugger_on_recursive_panic, to allow entering the debugger only
when this occurs.
For for simplicity in maintaining existing behaviour, the tunable
defaults to zero.
Reviewed by: cem, markj
Sponsored by: NetApp, Inc.
Sponsored by: Klara, Inc.
Differential Revision: https://reviews.freebsd.org/D27271
Notes
Notes:
svn path=/head/; revision=367848
Diffstat (limited to 'share')
| -rw-r--r-- | share/man/man4/ddb.4 | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/share/man/man4/ddb.4 b/share/man/man4/ddb.4 index c4ea9f9cf92a..5dab5c42a2ce 100644 --- a/share/man/man4/ddb.4 +++ b/share/man/man4/ddb.4 @@ -26,7 +26,7 @@ .\" .\" $FreeBSD$ .\" -.Dd October 17, 2019 +.Dd November 19, 2020 .Dt DDB 4 .Os .Sh NAME @@ -87,6 +87,16 @@ which is the default unless the .Dv KDB_UNATTENDED option is specified. +Similarly, if the +.Va debug.debugger_on_recursive_panic +variable is set to +.Dv 1 , +then the debugger will be invoked on a recursive kernel panic. +This variable has a default value of +.Dv 0 , +and has no effect if +.Va debug.debugger_on_panic +is already set non-zero. .Pp The current location is called .Va dot . |