Always search TIDs for the crashing processes.

base/linux_util.h

Index: base/linux_util.h
===================================================================
--- base/linux_util.h	(revision 88621)
+++ base/linux_util.h	(working copy)
@@ -37,9 +37,11 @@
 // For a given process |pid|, look through all its threads and find the first
 // thread with /proc/[pid]/task/[thread_id]/syscall whose first N bytes matches
 // |expected_data|, where N is the length of |expected_data|.
-// Returns the thread id or -1 on error.
+// Returns the thread id or -1 on error.  If |syscall_supported| is
+// set to false the kernel does not support syscall in procfs.

[Mark Mentovai, 2011/06/21 00:11:24]

You should comment that syscall_supported must be non-NULL, or you should make
the implementation in the .cc file tolerate a NULL argument.

[kmixter1, 2011/06/21 00:55:33]

Done.  Handling when it's NULL.

 BASE_API pid_t FindThreadIDWithSyscall(pid_t pid,
-                                       const std::string& expected_data);
+                                       const std::string& expected_data,
+                                       bool* syscall_supported);
 
 }  // namespace base