Hi,
I am running lubuntu 14.04 with the latest Linaro kernel
(git.linaro.org/kernel/linux-linaro-tracking)
on arndale, I found once X is started ('xinit' is enough) , any one of
the following operations will
very easily cause kernel panic or hang,
(1) Ctrl+Alt+F1 and Alt+F7 switch between graphic mode and text mode;
(2) 'xinit' to start graphic mode, then 'exit' to quit graphic mode;
(3) After login into Lunbuntu desktop, switch user account to login;
The kernel is compiled by using the 'exynos_defconfig' and
'exynos5250-arndale.dts'.
Sometimes the kernel hang without any response, sometimes the kernel
panic with messages below,
[ 72.675919] Unable to handle kernel paging request at virtual address
72643d5
[ 72.676016] pgd = e8bdc000
[ 72.676055] [72643d45] *pgd=00000000
[ 72.676111] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 72.676181] Modules linked in:
[ 72.676231] CPU: 0 PID: 3840 Comm: udev-acl.ck Not tainted
3.15.0-rc8-dirty 2
[ 72.682703] task: e93b0c00 ti: e88fe000 task.ti: e88fe000
[ 72.688091] PC is at strnlen+0xc/0x54
[ 72.691733] LR is at string.isra.4+0x2c/0xcc
...
[<c01c63c0>] (strnlen) from [<c01c7f34>] (string.isra.4+0x2c/0xc)
[ 73.296125] [<c01c7f34>] (string.isra.4) from [<c01c92e4>]
(vsnprintf+0x180/)
[ 73.303676] [<c01c92e4>] (vsnprintf) from [<c01c9570>]
(sprintf+0x24/0x34)
[ 73.310536] [<c01c9570>] (sprintf) from [<c025f9fc>]
(uevent_show+0xcc/0x100)
[ 73.317651] [<c025f9fc>] (uevent_show) from [<c026004c>]
(dev_attr_show+0x20)
[ 73.325204] [<c026004c>] (dev_attr_show) from [<c0114ed0>]
(sysfs_kf_seq_sho)
[ 73.333276] [<c0114ed0>] (sysfs_kf_seq_show) from [<c0113cb4>]
(kernfs_seq_s)
[ 73.341522] [<c0113cb4>] (kernfs_seq_show) from [<c00d9670>]
(seq_read+0x1c0)
[ 73.349160] [<c00d9670>] (seq_read) from [<c00bb204>]
(vfs_read+0x9c/0x12c)
[ 73.356103] [<c00bb204>] (vfs_read) from [<c00bb3d0>]
(SyS_read+0x44/0x84)
[ 73.362961] [<c00bb3d0>] (SyS_read) from [<c000e420>]
(ret_fast_syscall+0x0/)
[ 73.370423] Code: e12fff1e e3510000 01a00001 012fff1e (e5d02000)
or sometimes with below,
[ 55.480788] Unable to handle kernel NULL pointer dereference ac
[ 55.480896] pgd = e9b84000
[ 55.480935] [0000026c] *pgd=00000000
[ 55.480991] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 55.481061] Modules linked in:
[ 55.481155] CPU: 1 PID: 3488 Comm: Xorg Not tainted 3.15.0-rc8-dirty #12
[ 55.487835] task: ea1aa400 ti: e8f54000 task.ti: e8f54000
[ 55.493222] PC is at evdev_poll+0x28/0x64
[ 55.497218] LR is at do_select+0x328/0x650
[ 55.501291] pc : [<c02eb088>] lr : [<c00cb2dc>] psr: 600f0013
[ 55.501291] sp : e8f55b30 ip : e9bc4900 fp : c02eb060
[ 55.512747] r10: e9bc4900 r9 : 00000000 r8 : 00003c00
[ 55.517955] r7 : 0000000e r6 : 00000016 r5 : 00000000 r4 : e9355000
[ 55.524465] r3 : 00000000 r2 : e8f55bb4 r1 : 00000028 r0 : e9bc4900
[ 55.530976] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment user
[ 55.538093] Control: 10c5387d Table: 69b8406a DAC: 00000015
...
[<c02eb088>] (evdev_poll) from [<c00cb2dc>] (do_select+0x328/0x6)
[ 56.505313] [<c00cb2dc>] (do_select) from [<c00cb754>]
(core_sys_select+0x15)
[ 56.513037] [<c00cb754>] (core_sys_select) from [<c00cb9d4>]
(SyS_select+0xc)
[ 56.520764] [<c00cb9d4>] (SyS_select) from [<c000e420>]
(ret_fast_syscall+0x)
[ 56.528397] Code: e2851028 e3530000 13750028 1a00000c (e5d5326c)
[ 56.534547] ---[ end trace 6b03dd550054bcfd ]---
Any suggestion on how to fix this is appreciated.
Cheers,
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