Look at section "# Create cgroup mount points for process groups" of an unmodified AOSP recent version of<div>platform/system/core/rootdir/init.rc&nbsp;</div><div><br></div><div>p.s. please don't use the previous email address<br><br>On Friday, January 18, 2013 5:56:16 PM UTC-8, Zach Pfeffer wrote:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">So I think this issue may be Android kernel related, because we seem
<br>to be the only ones hitting it. This seems to imply that there's a
<br>kernel change we don't have or the kernel has changed in our newer
<br>versions. The symptom is:
<br>
<br>W/SchedPolicy( 1193): add_tid_to_cgroup failed to write '1263'
<br>(Permission denied); policy=1
<br>W/ActivityManager( 1193): Failed setting process group of 1263 to -1
<br>W/System.err( 1193): java.lang.SecurityException: No permission to set
<br>to given group
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at android.os.Process.<wbr>setProcessGroup(Native Method)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateOomAdjLocked(<wbr>ActivityManagerService.java:<wbr>13516)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateOomAdjLocked(<wbr>ActivityManagerService.java:<wbr>13636)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateLruProcessLocked(<wbr>ActivityManagerService.java:<wbr>1903)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActiveServices.<wbr>realStartServiceLocked(<wbr>ActiveServices.java:1089)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActiveServices.<wbr>attachApplicationLocked(<wbr>ActiveServices.java:1472)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>attachApplicationLocked(<wbr>ActivityManagerService.java:<wbr>4269)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>attachApplication(<wbr>ActivityManagerService.java:<wbr>4317)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>android.app.<wbr>ActivityManagerNative.<wbr>onTransact(<wbr>ActivityManagerNative.java:<wbr>386)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>onTransact(<wbr>ActivityManagerService.java:<wbr>1675)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at android.os.Binder.<wbr>execTransact(Binder.java:351)
<br>W/System.err( 1193): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at dalvik.system.NativeStart.run(<wbr>Native Method)
<br>
<br>Looking back at top:
<br>
<br>I have:
<br>
<br>&nbsp;1193 &nbsp;0 &nbsp; 0% S &nbsp; &nbsp;70 548684K &nbsp;42168K &nbsp;fg system &nbsp; system_server
<br>&nbsp;1263 &nbsp;0 &nbsp; 0% S &nbsp; &nbsp;13 476904K &nbsp;36216K &nbsp;fg u0_a27 &nbsp; com.android.systemui
<br>
<br>so system_server is attempting to write com.android.systemui and its
<br>getting an error. The relevant native function seems to be:
<br>
<br>&nbsp;/workspace/androids/4_juice-<wbr>aosp/system/core/libcutils/<wbr>sched_policy.c
<br>
<br>I saw that Tixy also hit this,
<br>
<br><a href="https://bugs.launchpad.net/linaro-landing-team-arm/+bug/1037611" target="_blank">https://bugs.launchpad.net/<wbr>linaro-landing-team-arm/+bug/<wbr>1037611</a>
<br>
<br>..but that the bug never got assigned, etc...
<br>
<br>I tried setting:
<br>
<br>chmod 0660 /dev/cpuctl/tasks
<br>
<br>to
<br>
<br>chmod 0666 /dev/cpuctl/tasks
<br>
<br>but didn't see any difference.
<br>
<br>This change from the Android automerger, seems to be related:
<br>
<br><a href="https://android.googlesource.com/platform/system/core/+/d7562ee3d61504ba5d2ff3117cb64216566a40ef%5E2..d7562ee3d61504ba5d2ff3117cb64216566a40ef/" target="_blank">https://android.googlesource.<wbr>com/platform/system/core/+/<wbr>d7562ee3d61504ba5d2ff3117cb642<wbr>16566a40ef%5E2..<wbr>d7562ee3d61504ba5d2ff3117cb642<wbr>16566a40ef/</a>
<br>
<br>I also found what appears to be a workaround:
<br>
<br><a href="https://android.googlesource.com/platform/frameworks/native/+/f30fd01497a53cbff8692721026c3f7b6830158e%5E1..f30fd01497a53cbff8692721026c3f7b6830158e/" target="_blank">https://android.googlesource.<wbr>com/platform/frameworks/<wbr>native/+/<wbr>f30fd01497a53cbff8692721026c3f<wbr>7b6830158e%5E1..<wbr>f30fd01497a53cbff8692721026c3f<wbr>7b6830158e/</a>
<br>
<br>Looking at additional logs I see what looks like an attempt to put the
<br>process that needs to get changed into the right group:
<br>
<br>W/System.err( 1192): java.lang.SecurityException: No permission to set
<br>to given group
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at android.os.Process.<wbr>setProcessGroup(Native Method)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateOomAdjLocked(<wbr>ActivityManagerService.java:<wbr>13516)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateOomAdjLocked(<wbr>ActivityManagerService.java:<wbr>13636)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>updateLruProcessLocked(<wbr>ActivityManagerService.java:<wbr>1903)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActiveServices.<wbr>realStartServiceLocked(<wbr>ActiveServices.java:1089)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActiveServices.<wbr>attachApplicationLocked(<wbr>ActiveServices.java:1472)
<br>W/SchedPolicy( 1192): add_tid_to_cgroup failed to write '1268'
<br>(Permission denied); policy=1
<br>W/ActivityManager( 1192): Failed setting process group of 1268 to -1
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>attachApplicationLocked(<wbr>ActivityManagerService.java:<wbr>4269)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>attachApplication(<wbr>ActivityManagerService.java:<wbr>4317)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>android.app.<wbr>ActivityManagerNative.<wbr>onTransact(<wbr>ActivityManagerNative.java:<wbr>386)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at
<br>com.android.server.am.<wbr>ActivityManagerService.<wbr>onTransact(<wbr>ActivityManagerService.java:<wbr>1675)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at android.os.Binder.<wbr>execTransact(Binder.java:351)
<br>W/System.err( 1192): &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;at dalvik.system.NativeStart.run(<wbr>Native Method)
<br>
<br>1192 &nbsp;0 &nbsp; 0% S &nbsp; &nbsp;71 549636K &nbsp;42460K &nbsp;fg system &nbsp; system_server
<br>1268 &nbsp;0 &nbsp; 0% S &nbsp; &nbsp;14 477920K &nbsp;36224K &nbsp;fg u0_a27 &nbsp; com.android.systemui
<br>
<br>From these logs I think system_server is trying to put
<br>com.android.systemui into the bg because its using a lot of CPU, but
<br>it can't because it either doesn't have access or something else is
<br>going on.
<br>
<br>Anyhow, attached some logs from a first boot scenario.
<br>
<br>Any help or insight would be great.
<br>
<br>-- 
<br>Zach Pfeffer
<br>Android Platform Team Lead, Linaro Platform Teams
<br>Linaro.org | Open source software for ARM SoCs
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<br></blockquote></div>