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SubjectRe: BUG: using __this_cpu_write() in preemptible [00000000] code: systemd-udevd/497
On 15/04/14 01:55, Luis Henriques wrote:
>
> (Cc'ing both lis3lv02d and ACPI maintainers)
>
> Since commit 188a81409ff7de1c5aae947a96356ddd8ff4aaa3 ("percpu: add
> preemption checks to __this_cpu ops") I've been seeing the following:
Hi,

I've had a quick look at the lis3lv02d_acpi_read() (in
drivers/platform/x86/hp_accel.c) and couldn't see anything obvious. It
basically does:
status = acpi_evaluate_integer(dev->handle, "ALRD", &args, &lret);

Is there anything special to take care before calling
acpi_evaluate_integer()? After having a look at some codes calling it
nothing obvious either jumped to my eyes.

>
> [ 10.485588] hp_accel: hardware type HPB64xx found
> [ 10.485772] BUG: using __this_cpu_write() in preemptible [00000000] code: systemd-udevd/497
> [ 10.485777] caller is __this_cpu_preempt_check+0x13/0x20
> [ 10.485781] CPU: 3 PID: 497 Comm: systemd-udevd Tainted: G W 3.15.0-rc1 #9
> [ 10.485783] Hardware name: Hewlett-Packard HP EliteBook 8470p/179B, BIOS 68ICF Ver. F.02 04/27/2012
> [ 10.485785] ffffffff81a14db5 ffff88022c80b8e0 ffffffff81604ba4 0000000000000003
> [ 10.485789] ffff88022c80b908 ffffffff81313431 0000000000000000 0000000000000032
> [ 10.485793] 00000000000003e8 ffff88022c80b918 ffffffff81313473 ffff88022c80b928
> [ 10.485796] Call Trace:
> [ 10.485802] [<ffffffff81604ba4>] dump_stack+0x4e/0x7a
> [ 10.485805] [<ffffffff81313431>] check_preemption_disabled+0xe1/0xf0
> [ 10.485808] [<ffffffff81313473>] __this_cpu_preempt_check+0x13/0x20
> [ 10.485813] [<ffffffff810e4eb8>] touch_nmi_watchdog+0x28/0x40
> [ 10.485817] [<ffffffff81369c29>] acpi_os_stall+0x37/0x40
> [ 10.485822] [<ffffffff813843e2>] acpi_ex_system_do_stall+0x39/0x3d
> [ 10.485825] [<ffffffff81381138>] acpi_ex_opcode_1A_0T_0R+0x72/0xa3
> [ 10.485829] [<ffffffff81379a5d>] acpi_ds_exec_end_op+0xd0/0x3e8
> [ 10.485833] [<ffffffff8138b118>] acpi_ps_parse_loop+0x51d/0x576
> [ 10.485836] [<ffffffff8138bbc4>] acpi_ps_parse_aml+0x98/0x289
> [ 10.485839] [<ffffffff8138c41e>] acpi_ps_execute_method+0x1c1/0x26c
> [ 10.485843] [<ffffffff81386dcd>] acpi_ns_evaluate+0x1c1/0x258
> [ 10.485846] [<ffffffff8138960d>] acpi_evaluate_object+0x126/0x22f
> [ 10.485850] [<ffffffff810a4492>] ? wake_up_klogd+0x52/0x70
> [ 10.485853] [<ffffffff8136a520>] acpi_evaluate_integer+0x34/0x52
> [ 10.485858] [<ffffffffa01671e9>] lis3lv02d_acpi_read+0x59/0x70 [hp_accel]
> [ 10.485863] [<ffffffffa014e426>] lis3lv02d_init_device+0x26/0xc00 [lis3lv02d]
> [ 10.485866] [<ffffffff8138dc93>] ? acpi_walk_resources+0x77/0x8d
> [ 10.485870] [<ffffffffa0167265>] ? lis3lv02d_dmi_matched+0x35/0x40 [hp_accel]
> [ 10.485874] [<ffffffffa0167381>] lis3lv02d_add+0xe1/0x1d0 [hp_accel]
> [ 10.485878] [<ffffffff8136d83f>] acpi_device_probe+0x41/0xee
> [ 10.485882] [<ffffffff813eba1d>] driver_probe_device+0xfd/0x240
> [ 10.485886] [<ffffffff813ebc33>] __driver_attach+0x93/0xa0
> [ 10.485889] [<ffffffff813ebba0>] ? __device_attach+0x40/0x40
> [ 10.485893] [<ffffffff813e9b93>] bus_for_each_dev+0x63/0xa0
> [ 10.485897] [<ffffffff813eb4ae>] driver_attach+0x1e/0x20
> [ 10.485900] [<ffffffff813eb0e8>] bus_add_driver+0x178/0x230
> [ 10.485904] [<ffffffffa001d000>] ? 0xffffffffa001cfff
> [ 10.485908] [<ffffffff813ec264>] driver_register+0x64/0xf0
> [ 10.485911] [<ffffffffa001d000>] ? 0xffffffffa001cfff
> [ 10.485915] [<ffffffff8136e081>] acpi_bus_register_driver+0x3b/0x43
> [ 10.485919] [<ffffffffa001d010>] lis3lv02d_driver_init+0x10/0x1000 [hp_accel]
> [ 10.485923] [<ffffffff81000352>] do_one_initcall+0x112/0x160
> [ 10.485927] [<ffffffff8103c763>] ? set_memory_nx+0x43/0x50
> [ 10.485932] [<ffffffff810c79f0>] load_module+0x1b20/0x22f0
> [ 10.485936] [<ffffffff810c4860>] ? ref_module+0x120/0x120
> [ 10.485940] [<ffffffff810c4b6a>] ? copy_module_from_fd.isra.46+0x10a/0x160
> [ 10.485944] [<ffffffff810c82ee>] SyS_finit_module+0x7e/0x80
> [ 10.485949] [<ffffffff81614356>] system_call_fastpath+0x1a/0x1f
>
> Before this BUG, I also have the following, which doesn't seem related
> (but I may be wrong):
:
I also agree with you this second stack dump is probably unrelated :-)

Cheers,
Éric

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