Date: Mon, 24 Mar 2003 02:17:14 -0800 (PST) From: Bruce Evans <bde@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/i386/i386 db_interface.c Message-ID: <200303241017.h2OAHEB5058289@repoman.freebsd.org>
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bde 2003/03/24 02:17:14 PST
FreeBSD src repository
Modified files:
sys/i386/i386 db_interface.c
Log:
Disable interrupts while in kdb_trap() to handle cases where the caller
doesn't do it. This fixes all known causes of "Context switches not
allowed in the debugger" in mi_switch(). The main cause was trap_fatal()
calling kdb_trap() with interrupts enabled. Switching to ithreads for
interrupt handling then made fatal traps more fatal and harder to debug.
The problem was limited in -current because most interrupt handlers are
blocked by Giant, but it occurred almost deterministically for me because
my clock interrupt handlers are non-fast and not blocked by Giant.
Revision Changes Path
1.71 +7 -0 src/sys/i386/i386/db_interface.c
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