Failed to find cpusubsys spam 2.6.29 kernel running Froyo

I/dalvikvm(  191): "Signal Catcher" daemon prio=5 tid=3 RUNNABLE
I/dalvikvm(  191):   | group="system" sCount=0 dsCount=0 s=N obj=0x43e041e8 self=0x11fd88
I/dalvikvm(  191):   | sysTid=193 nice=0 sched=0/0 cgrp=unknown handle=1157640
I/dalvikvm(  191):   | schedstat=( 3041229258 10333740164 24961 )
I/dalvikvm(  191):   at dalvik.system.NativeStart.run(Native Method)
I/dalvikvm(  191): 
E/dalvikvm(  191): Failed to find cpu subsys
I/dalvikvm(  191): "Binder Thread #15" prio=5 tid=57 RUNNABLE
I/dalvikvm(  191):   | group="main" sCount=1 dsCount=0 s=N obj=0x442cf120 self=0x4ff600
I/dalvikvm(  191):   | sysTid=4303 nice=0 sched=0/0 cgrp=unknown handle=5240256
I/dalvikvm(  191):   | schedstat=( 21431793329 1608072845366 68888 )

Followed by spam of 
E/dalvikvm(  191): Failed to find cpu subsys

It seems that thread.c in the dalvikvm is failing to find a scheduler group, specifically in proc/<pid>/cgroup

FROM Thread.c in android.git for dalvikvm (http://android.git.kernel.org/?p=platform/dalvik.git;a=blob_plain;f=vm/Thread.c)

/*
 * Try to get the scheduler group.
 *
 * The data from /proc/<pid>/cgroup looks (something) like:
 *  2:cpu:/bg_non_interactive
 *  1:cpuacct:/
 *
 * We return the part after the "/", which will be an empty string for
 * the default cgroup.  If the string is longer than "bufLen", the string
 * will be truncated.
 *
 * TODO: this is cloned from a static function in libcutils; expose that?
 */
static int getSchedulerGroup(int tid, char* buf, size_t bufLen)
{
#ifdef HAVE_ANDROID_OS
    char pathBuf[32];
    char lineBuf[256];
    FILE *fp;

    snprintf(pathBuf, sizeof(pathBuf), "/proc/%d/cgroup", tid);
    if (!(fp = fopen(pathBuf, "r"))) {
        return -1;
    }

    while(fgets(lineBuf, sizeof(lineBuf) -1, fp)) {
        char *next = lineBuf;
        char *subsys;
        char *grp;
        size_t len;

        /* Junk the first field */
        if (!strsep(&next, ":")) {
            goto out_bad_data;
        }

        if (!(subsys = strsep(&next, ":"))) {
            goto out_bad_data;
        }

        if (strcmp(subsys, "cpu")) {
            /* Not the subsys we're looking for */
            continue;
        }

        if (!(grp = strsep(&next, ":"))) {
            goto out_bad_data;
        }
        grp++; /* Drop the leading '/' */
        len = strlen(grp);
        grp[len-1] = '\0'; /* Drop the trailing '\n' */

        if (bufLen <= len) {
            len = bufLen - 1;
        }
        strncpy(buf, grp, len);
        buf[len] = '\0';
        fclose(fp);
        return 0;
    }

    LOGE("Failed to find cpu subsys");


Nice to finally pinpoint this.