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SubjectUndefined instruction error on Cortex A57 (aarch64) in init process
From
In android system, after system is running for long time say 10 hour,
some time i am hitting below
traces:

init[1]: undefined instruction: pc=0000000000401624
Code: 1a9f00c2 aa1703e0 2a1603e1 9400e1bf (6b1f001f)
Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004

CPU: 0 PID: 1 Comm: init Tainted: G O 3.10.67-g978f332 #15
Call trace:
[<ffffffc000089ccc>] dump_backtrace+0x0/0xf4
[<ffffffc00008a05c>] show_stack+0x10/0x1c
[<ffffffc0003738c0>] dump_stack+0x1c/0x28
[<ffffffc0000aa84c>] panic+0xf8/0x118
[<ffffffc0000af790>] find_new_reaper+0x98/0x154
[<ffffffc0000b0490>] forget_original_parent+0x40/0x1cc
[<ffffffc0000b0630>] exit_notify+0x14/0x16c
[<ffffffc0000b0a4c>] do_exit+0x2c4/0x3ec
[<ffffffc0000b1814>] do_group_exit+0xe8/0xec
[<ffffffc0000c1b8c>] get_signal_to_deliver+0x310/0x3a8
[<ffffffc000089648>] do_signal+0x160/0x180

The objdump of binary around this address is :
401610: eb1f011f cmp x8, xzr
401614: 1a9f00c2 csel w2, w6, wzr, eq
bootchart_count = 0;
}
}
endif

nr = poll(ufds, fd_count, timeout);
401618: aa1703e0 mov x0, x23
40161c: 2a1603e1 mov w1, w22
401620: 9400e1df bl 439d9c <poll>
if (nr <= 0)
401624: 6b1f001f cmp w0, wzr
401628: 54fffccd b.le 4015c0 <main+0x558>
continue;

for (i = 0; i < fd_count; i++) {
40162c: 34fffcb6 cbz w22, 4015c0 <main+0x558>
401630: 510006c9 sub w9, w22, #0x1
401634: aa1703f3 mov x19, x23
401638: 9100052a add x10, x9, #0x1
40163c: 8b0a0ef4 add x20, x23, x10, lsl #3

Could any one please point me to what could be the problem here ? Or
how further i can approach to debug this further.

-Pankaj Kumar


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