[Crash-utility] [PATCH 0/3] Add support for TASK_IDLE and TASK_NEW task states

kernel commit 06eb61844d ("sched/debug: Add explicit TASK_IDLE printing") exposed the TASK_IDLE task state to user space as 'I (idle)' state. $ cat /proc/4/status Name: kworker/0:0H Umask: 0000 State: I (idle) $ ps 4 PID TTY STAT TIME COMMAND 4 ? I< 0:00 [kworker/0:0H] On the other hand, crash still shows 'UN' for TASK_IDLE state. crash> ps 4 PID PPID CPU TASK ST %MEM VSZ RSS COMM 4 2 0 ffff8d1dbe884200 UN 0.0 0 0 [kworker/0:0H] crash> ps -S RU: 3 IN: 69 UN: 53 It is confusing for support folks, and 'foreach UN bt', which shows useful information for troubles like system stall, includes unexpected idle tasks. So let's print TASK_IDLE as 'ID' state. [Patch 2] However, since Linux 4.14, kernel commit 20435d84e5 ("sched/debug: Intruduce task_state_to_char() helper function") removed the 'stat_nam' symbol, with which we've got the values of task state bitmasks. So now we need to get them correctly by using 'task_state_array' again. [Patch 1] Additionally, kernel commit 7dc603c902 ("sched/fair: Fix PELT integrity for new tasks") introduced TASK_NEW state. [Patch 3] adds support for it as 'NE' state. Kazuhito Hagio (3): Fix task state bitmasks for 4.14 and later Add support for TASK_IDLE task state Add support for TASK_NEW task state help.c | 4 ++-- task.c | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 54 insertions(+), 4 deletions(-) -- 1.8.3.1