On 17/03/14 16:09, Tomi Valkeinen wrote:
> Hi,
>
> I noticed that my omap4 panda does not boot with today's linux-next
> (8808b950581f71e3ee4cf8e6cae479f4c7106405). I didn't have much time to study
> it, but I didn't find any posts about the issue with a quick look. Below is
> the crash.
I bisected this to the commit:
commit ad2c12e9bc250b3387bcb4ab9ab114f43ff6122f
Author: Pantelis Antoniou <panto@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Fri Dec 13 20:08:59 2013 +0200
of: device_node kobject lifecycle fixes
After the move to having device nodes be proper kobjects the lifecycle
of the node needs to be controlled better.
At first convert of_add_node() in the unflattened functions to
of_init_node() which initializes the kobject so that of_node_get/put
work correctly even before of_init is called.
Afterwards introduce of_node_is_initialized & of_node_is_attached that
query the underlying kobject about the state (attached means kobj
is visible in sysfs)
Using that make sure the lifecycle of the tree is correct at all
times.
Signed-off-by: Pantelis Antoniou <panto@xxxxxxxxxxxxxxxxxxxxxxx>
[grant.likely: moved of_node_init() calls, fixed up locking, and
dropped __of_populate() hunks]
Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxx>
>
> Tomi
>
> [ 0.000000] ti_dt_clocks_register: failed to lookup clock node div_ts_ck
> [ 0.000000] ti_dt_clocks_register: failed to lookup clock node bandgap_ts_fclk
> [ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 0000004c
> [ 0.000000] pgd = c0004000
> [ 0.000000] [0000004c] *pgd=00000000
> [ 0.000000] Internal error: Oops: 5 [#1] SMP ARM
> [ 0.000000] Modules linked in:
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.0-rc6-next-20140317-09382-g8808b950581f #104
> [ 0.000000] task: c088ddf8 ti: c0882000 task.ti: c0882000
> [ 0.000000] PC is at kernfs_find_ns+0x14/0x13c
> [ 0.000000] LR is at kernfs_find_and_get_ns+0x38/0x54
> [ 0.000000] pc : [<c019607c>] lr : [<c019628c>] psr: 600001d3
> [ 0.000000] sp : c0883e00 ip : c0883e30 fp : c0883e2c
> [ 0.000000] r10: c0891114 r9 : ebfa11c0 r8 : ebfcd464
> [ 0.000000] r7 : 00000000 r6 : 00000000 r5 : c07c1814 r4 : c08e9ad8
> [ 0.000000] r3 : c08f568c r2 : 00000000 r1 : c07c1814 r0 : 00000000
> [ 0.000000] Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel
> [ 0.000000] Control: 10c5387d Table: 8000404a DAC: 00000015
> [ 0.000000] Process swapper/0 (pid: 0, stack limit = 0xc0882248)
> [ 0.000000] Stack: (0xc0883e00 to 0xc0884000)
> [ 0.000000] 3e00: 00000000 c08e9ad8 c07c1814 c08e9ad8 c07c1814 00000000 00000000 ebfcd464
> [ 0.000000] 3e20: c0883e4c c0883e30 c019628c c0196074 c07c1814 00000000 c07c1814 ebfcd490
> [ 0.000000] 3e40: c0883e6c c0883e50 c04c6180 c0196260 c0891140 c07c1814 ebfcd490 00000001
> [ 0.000000] 3e60: c0883e9c c0883e70 c04c7308 c04c6160 c008a208 c008a130 c0883e9c 00000000
> [ 0.000000] 3e80: c07c1814 c0891140 ebfcd464 a00001d3 c0883ec4 c0883ea0 c04c7c9c c04c72cc
> [ 0.000000] 3ea0: c0882000 ebfcd464 c074dcc8 c086bf64 00000001 c074de24 c0883ee4 c0883ec8
> [ 0.000000] 3ec0: c0824b70 c04c7c14 c0891114 c0938af8 00000000 c074dcc8 c0883f54 c0883ee8
> [ 0.000000] 3ee0: c0824c58 c0824b18 00000000 c0e8bf6c c0882000 ffffffff c0883f14 c0883f08
> [ 0.000000] 3f00: c05bc6b4 c05bc44c c0883f34 c0883f18 c04cca04 c05bc6b0 00000000 00000000
> [ 0.000000] 3f20: eb016b80 c0882000 c0883f4c c0883f38 c0938af8 c08910c0 c074dcc8 c074de24
> [ 0.000000] 3f40: c086ad60 c088a880 c0883f7c c0883f58 c0824f5c c0824c20 00000001 c0883f68
> [ 0.000000] 3f60: 00000001 c09380c0 c0882000 ffffffff c0883f8c c0883f80 c0825250 c0824f1c
> [ 0.000000] 3f80: c0883f9c c0883f90 c0825400 c0825238 c0883fac c0883fa0 c081d67c c08253fc
> [ 0.000000] 3fa0: c0883ff4 c0883fb0 c0819a30 c081d664 ffffffff ffffffff c08195d0 00000000
> [ 0.000000] 3fc0: 00000000 c086ad60 00000000 10c5387d c088a92c c086ad5c c088f684 8000406a
> [ 0.000000] 3fe0: 412fc09a 00000000 00000000 c0883ff8 80008074 c0819840 00000000 00000000
> [ 0.000000] Backtrace:
> [ 0.000000] [<c0196068>] (kernfs_find_ns) from [<c019628c>] (kernfs_find_and_get_ns+0x38/0x54)
> [ 0.000000] r8:ebfcd464 r7:00000000 r6:00000000 r5:c07c1814 r4:c08e9ad8
> [ 0.000000] [<c0196254>] (kernfs_find_and_get_ns) from [<c04c6180>] (safe_name+0x2c/0x98)
> [ 0.000000] r7:ebfcd490 r6:c07c1814 r5:00000000 r4:c07c1814
> [ 0.000000] [<c04c6154>] (safe_name) from [<c04c7308>] (__of_add_property_sysfs+0x48/0xc4)
> [ 0.000000] r7:00000001 r6:ebfcd490 r5:c07c1814 r4:c0891140
> [ 0.000000] [<c04c72c0>] (__of_add_property_sysfs) from [<c04c7c9c>] (of_add_property+0x94/0xa0)
> [ 0.000000] r8:a00001d3 r7:ebfcd464 r6:c0891140 r5:c07c1814 r4:00000000
> [ 0.000000] [<c04c7c08>] (of_add_property) from [<c0824b70>] (omap_get_timer_dt+0x64/0x108)
> [ 0.000000] r8:c074de24 r7:00000001 r6:c086bf64 r5:c074dcc8 r4:ebfcd464 r3:c0882000
> [ 0.000000] [<c0824b0c>] (omap_get_timer_dt) from [<c0824c58>] (omap_dm_timer_init_one+0x44/0x2fc)
> [ 0.000000] r6:c074dcc8 r5:00000000 r4:c0938af8 r3:c0891114
> [ 0.000000] [<c0824c14>] (omap_dm_timer_init_one) from [<c0824f5c>] (omap2_gp_clockevent_init+0x4c/0xd0)
> [ 0.000000] r10:c088a880 r8:c086ad60 r7:c074de24 r6:c074dcc8 r5:c08910c0 r4:c0938af8
> [ 0.000000] [<c0824f10>] (omap2_gp_clockevent_init) from [<c0825250>] (omap4_sync32k_timer_init+0x24/0x60)
> [ 0.000000] r7:ffffffff r6:c0882000 r5:c09380c0 r4:00000001
> [ 0.000000] [<c082522c>] (omap4_sync32k_timer_init) from [<c0825400>] (omap4_local_timer_init+0x10/0x68)
> [ 0.000000] [<c08253f0>] (omap4_local_timer_init) from [<c081d67c>] (time_init+0x24/0x38)
> [ 0.000000] [<c081d658>] (time_init) from [<c0819a30>] (start_kernel+0x1fc/0x390)
> [ 0.000000] [<c0819834>] (start_kernel) from [<80008074>] (0x80008074)
> [ 0.000000] r10:00000000 r9:412fc09a r8:8000406a r7:c088f684 r6:c086ad5c r5:c088a92c
> [ 0.000000] r4:10c5387d
> [ 0.000000] Code: e92dd9f0 e24cb004 e24dd00c e59f3104 (e1d084bc)
> [ 0.000000] ---[ end trace 3406ff24bd97382e ]---
> [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
> [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task!
>
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