Author: kib
Date: Fri Jul 15 23:26:33 2016
New Revision: 302919
URL: https://svnweb.freebsd.org/changeset/base/302919
Log:
In ptrace_vm_entry(), do not call vmspace_free() while owning a vm
object lock.
The vmspace_free() operations might need to lock map, object etc on
last dereference. Postpone the free until object's inspection is
done.
Reported and tested by: will
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Modified:
head/sys/kern/sys_process.c
Modified: head/sys/kern/sys_process.c
==============================================================================
--- head/sys/kern/sys_process.c Fri Jul 15 23:24:00 2016 (r302918)
+++ head/sys/kern/sys_process.c Fri Jul 15 23:26:33 2016 (r302919)
@@ -433,7 +433,6 @@ ptrace_vm_entry(struct thread *td, struc
} while (0);
vm_map_unlock_read(map);
- vmspace_free(vm);
pve->pve_fsid = VNOVAL;
pve->pve_fileid = VNOVAL;
@@ -478,6 +477,7 @@ ptrace_vm_entry(struct thread *td, struc
free(freepath, M_TEMP);
}
}
+ vmspace_free(vm);
if (error == 0)
CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
p->p_pid, pve->pve_entry, pve->pve_start);
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