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| author | kib <kib@FreeBSD.org> | 2013-10-27 16:20:52 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2013-10-27 16:20:52 +0000 |
| commit | b385bc7f3120f41d6df5d6fddd109ab27fce9851 (patch) | |
| tree | dc9f56807d89e4ec4c383766c38ace5b07c6a08b /sys/kern | |
| parent | a5afef3ae88a3ec906b42c6b1b99be6d04b8bd95 (diff) | |
| download | FreeBSD-src-b385bc7f3120f41d6df5d6fddd109ab27fce9851.zip FreeBSD-src-b385bc7f3120f41d6df5d6fddd109ab27fce9851.tar.gz | |
When reentering kdb, typically due to a bug causing trap or assert in
the code executed in the context of debugger, do not be ashamed to
inform loudly about the re-entry. Also, print the backtrace before
obliterating current stack with longjmp, allowing the operator to see
a place which caused the bug.
The change should make it less mysterious debugging the ddb itself.
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Diffstat (limited to 'sys/kern')
| -rw-r--r-- | sys/kern/subr_kdb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/kern/subr_kdb.c b/sys/kern/subr_kdb.c index 59d6258..a7ed944 100644 --- a/sys/kern/subr_kdb.c +++ b/sys/kern/subr_kdb.c @@ -503,6 +503,8 @@ kdb_reenter(void) if (!kdb_active || kdb_jmpbufp == NULL) return; + printf("KDB: reentering\n"); + kdb_backtrace(); longjmp(kdb_jmpbufp, 1); /* NOTREACHED */ } |
