On 1/10/2018 10:50 AM, Alexey Dobriyan wrote:
We are seeing crash in do_task_stat while accessing stack pointer, It
seems same task has already completed do_exit call.
So it seems a race between them:
Please, post exact kernel version and struct task_struct::usage if you
still have that kernel core (or even full task_struct)
Hi Alexey,
We are working on 4.9.65 and Please find below usage value and other
task_struct value,
please let me know if some other data required as well.
crash_64> struct task_struct.usage -x 0xFFFFFFE80D8C2280
usage = {
counter = 0x4
}
struct task_struct.flags -x 0xFFFFFFE80D8C2280
flags = 0x40870c
crash_64> struct task_struct.exit_code -x 0xFFFFFFE80D8C2280
exit_code = 0x6
struct task_struct.state -x 0xFFFFFFE80D8C2280
state = 0x40
Please find below crash stack:
-000|user_stack_pointer(inline)
-000|do_task_stat(
| m = 0xFFFFFFE7A5CD7380,
| ns = 0xFFFFFF8E7C43C748,
| ?,
| task = 0xFFFFFFE80D8C2280,
| ?)
| tty_pgrp = 0
| ppid = 2084696064
| sid = 0
| mm = 0xFFFFFFE7B4424140
| tcomm = (84, 9, 71, 122, 142, 255, 255, 255, 48, 253, 240, 165, 231,
255, 255, 255)
| flags = 18446743969119403392
-001|proc_tgid_stat(
| m = 0xFFFFFFE7A5CD7380,
| ?,
| ?,
| ?)
-002|atomic_sub_return(inline)
Regards
Gaurav
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