path: root/llkd
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* llkd: bootstat: propagate detailed livelock canonical boot reasonMark Salyzyn2018-04-185-17/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Report kernel_panic,sysrq,livelock,<state> reboot reason via last dmesg (pstore console). Add ro.llk.killtest property, which will allow reliable ABA platforms to drop kill test and go directly to kernel panic. This should also allow some manual unit testing of the canonical boot reason report. New canonical boot reasons from llkd are: - kernel_panic,sysrq,livelock,alarm llkd itself locked up (Hail Mary) - kernel_panic,sysrq,livelock,driver uninterrruptible D state - kernel_panic,sysrq,livelock,zombie uninterrruptible Z state Manual test assumptions: - llkd is built by the platform and landed on system partition - unit test is built and landed in /data/nativetest (could land in /data/nativetest64, adjust test correspondingly) - llkd not enabled, ro.llk.enable and ro.llk.killtest are not set by platform allowing test to adjust all the configuration properties and start llkd. - or, llkd is enabled, ro.llk.enable is true, and killtest is disabled, ro.llk.killtest is false, setup by the platform. This breaks the go/apct generic operations of the unit test for llk.zombie and llk.driver as kernel panic results requiring manual intervention otherwise. If test moves to go/apct, then we will be forced to bypass these tests under this condition (but allow them to run if ro.llk.killtest is "off" so specific testing above/below can be run). for i in driver zombie; do adb shell su root setprop ro.llk.killtest off adb shell /data/nativetest/llkd_unit_test/llkd_unit_test --gtest_filter=llkd.${i} adb wait-for-device adb shell su root setprop ro.llk.killtest off sleep 60 adb shell getprop sys.boot.reason adb shell /data/nativetest/llkd_unit_test/llkd_unit_test --gtest_filter=llkd.${i} done Test: llkd_unit_test (see test assumptions) Bug: 33808187 Bug: 72838192 Change-Id: I2b24875376ddfdbc282ba3da5c5b3567de85dbc0
* llkd: default enabled for userdebugMark Salyzyn2018-04-185-10/+67
| | | | | | | | | | | | If LLK_ENABLE_DEFAULT is false, then check "ro.llk.enable" for "eng", also the default value if not set, and then check if userdebug build to establish a default of true for enable. Same for ro.khungtask.enable. Test: llkd_unit_test report eng status on "userdebug" or "user" builds Bug: 33808187 Bug: 72838192 Change-Id: I2adb23c7629dccaa2856c50bccbf4e363703c82c
* llkd: add live-lock daemonMark Salyzyn2018-04-189-0/+1747
Introduce a standalone live-lock daemon (llkd), to catch kernel or native user space deadlocks and take mitigating actions. Will also configure [khungtaskd] to fortify the actions. If a thread is in D or Z state with no forward progress for longer than ro.llk.timeout_ms, or ro.llk.[D|Z].timeout_ms, kill the process or parent process respectively. If another scan shows the same process continues to exist, then have a confirmed live-lock condition and need to panic. Panic the kernel in a manner to provide the greatest bugreporting details as to the condition. Add a alarm self watchdog should llkd ever get locked up that is double the expected time to flow through the mainloop. Sampling is every ro.llk_sample_ms. Default will not monitor init, or [kthreadd] and all that [kthreadd] spawns. This reduces the effectiveness of llkd by limiting its coverage. If in the future, if value in covering kthreadd spawned threads, the requirement will be to code drivers so that they do not remain in a persistent 'D' state, or that they have mechanisms to recover the thread should it be killed externally. Then the blacklists can be adjusted accordingly if these conditions are met. An accompanying gTest set have been added, and will setup a persistent D or Z process, with and without forward progress, but not in a live-lock state because that would require a buggy kernel, or a module or kernel modification to stimulate. Android Properties llkd respond to (*_ms parms are in milliseconds): - ro.config.low_ram default false, if true do not sysrq t (dump all threads). - ro.llk.enable default false, allow live-lock daemon to be enabled. - ro.khungtask.enable default false, allow [khungtaskd] to be enabled. - ro.llk.mlockall default true, allow mlock'd live-lock daemon. - ro.khungtask.timeout default 12 minutes. - ro.llk.timeout_ms default 10 minutes, D or Z maximum timelimit, double this value and it sets the alarm watchdog for llkd. - ro.llk.D.timeout_ms default ro.llk.timeout_ms, D maximum timelimit. - ro.llk.Z.timeout_ms default ro.llk.timeout_ms, Z maximum timelimit. - ro.llk.check_ms default 2 minutes sampling interval (ro.llk.timeout_ms / 5) for threads in D or Z state. - ro.llk.blacklist.process default 0,1,2 (kernel, init and [kthreadd]), and process names (/comm or /cmdline) init,[kthreadd], lmkd,lmkd.llkd,llkd,[khungtaskd],watchdogd,[watchdogd], [watchdogd/0] ... - ro.llk.blacklist.parent default 0,2 (kernel and [kthreadd]) and "[kthreadd]". A comma separated lists of process ids, /comm names or /cmdline names. - ro.llk.blacklist.uid default <empty>, comma separated list of uid numbers or names from getpwuid/getpwnam. Test: llkd_unit_test Bug: 33808187 Bug: 72838192 Change-Id: I32e8aa78aef10834e093265d0f3ed5b4199807c6