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bhyve: Move the gdb_active check to gdb_cpu_suspend().

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The check needs to be in the public routine (gdb_cpu_suspend()), not
in the internal routine called from various places
(_gdb_cpu_suspend()).  All the other callers of _gdb_cpu_suspend()
already check gdb_active, and this breaks the use of snapshots when
the debug server is not enabled since gdb_cpu_suspend() tries to lock
an uninitialized mutex.

Reported by:	Darius Mihai, Elena Mihailescu
Reviewed by:	elenamihailescu22_gmail.com
Fixes:		621b509048
Differential Revision:	https://reviews.freebsd.org/D29538
This commit is contained in:
John Baldwin 2021-04-12 11:43:34 -07:00
parent 600bd6ce06
commit eacc27affe
1 changed files with 2 additions and 2 deletions
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4
usr.sbin/bhyve/gdb.c
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@ -731,8 +731,6 @@ static void
_gdb_cpu_suspend(int vcpu, bool report_stop)
{
if (!gdb_active)
return;
debug("$vCPU %d suspending\n", vcpu);
CPU_SET(vcpu, &vcpus_waiting);
if (report_stop && CPU_CMP(&vcpus_waiting, &vcpus_suspended) == 0)
@ -807,6 +805,8 @@ void
gdb_cpu_suspend(int vcpu)
{
if (!gdb_active)
return;
pthread_mutex_lock(&gdb_lock);
_gdb_cpu_suspend(vcpu, true);
gdb_cpu_resume(vcpu);