On Wed, 19 Feb 2014, Xishi Qiu wrote: > Here is a warning, I don't whether it is relative to my hardware. > If set "kmemcheck=1 nowatchdog", it can boot. > > code: > ... > pte = kmemcheck_pte_lookup(address); > if (!pte) > return false; > > WARN_ON_ONCE(in_nmi()); > > if (error_code & 2) > ... > > log: > [ 10.920683] WARNING: CPU: 0 PID: 1 at arch/x86/mm/kmemcheck/kmemcheck.c:640 k > memcheck_fault+0xb1/0xc0() > [ 10.920684] Modules linked in: > [ 10.920686] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.14.0-rc3-0.1-default+ > #3 > [ 10.920687] Hardware name: Huawei Technologies Co., Ltd. Tecal RH2285 V2-24S/ > BC11SRSC1, BIOS RMISV055 02/02/2013 > [ 10.920690] 0000000000000280 ffff88085f807678 ffffffff814ca491 ffff88085f807 > 6b8 > [ 10.920693] ffffffff8104ce97 0000000000000000 ffff88085f807838 ffff88085f420 > 5d4 > [ 10.920695] 0000000000000000 0000000000000000 ffff88085f4205d4 ffff88085f807 > 6c8 > [ 10.920695] Call Trace: > [ 10.920701] <NMI> [<ffffffff814ca491>] dump_stack+0x6a/0x79 > [ 10.920705] [<ffffffff8104ce97>] warn_slowpath_common+0x87/0xb0 > [ 10.920707] [<ffffffff8104ced5>] warn_slowpath_null+0x15/0x20 > [ 10.920710] [<ffffffff810452c1>] kmemcheck_fault+0xb1/0xc0 > [ 10.920714] [<ffffffff814d262b>] __do_page_fault+0x39b/0x4c0 > [ 10.920718] [<ffffffff81272cd2>] ? put_dec+0x72/0x90 > [ 10.920720] [<ffffffff812730ba>] ? number+0x33a/0x360 > [ 10.920723] [<ffffffff814d2829>] do_page_fault+0x9/0x10 > [ 10.920726] [<ffffffff814cf222>] page_fault+0x22/0x30 > [ 10.920731] [<ffffffff81348b4c>] ? vt_console_print+0x8c/0x400 > [ 10.920733] [<ffffffff81348b2c>] ? vt_console_print+0x6c/0x400 > [ 10.920737] [<ffffffff8109cd9b>] ? msg_print_text+0x18b/0x1f0 > [ 10.920739] [<ffffffff8109bed1>] call_console_drivers+0xc1/0xe0 > [ 10.920741] [<ffffffff8109d746>] console_unlock+0x236/0x280 > [ 10.920744] [<ffffffff8109e095>] vprintk_emit+0x2b5/0x450 > [ 10.920746] [<ffffffff810452c1>] ? kmemcheck_fault+0xb1/0xc0 > [ 10.920748] [<ffffffff814ca3f7>] printk+0x4a/0x4c > [ 10.920750] [<ffffffff810452c1>] ? kmemcheck_fault+0xb1/0xc0 > [ 10.920753] [<ffffffff8104ce4e>] warn_slowpath_common+0x3e/0xb0 > [ 10.920755] [<ffffffff8104ced5>] warn_slowpath_null+0x15/0x20 > [ 10.920757] [<ffffffff810452c1>] kmemcheck_fault+0xb1/0xc0 > [ 10.920760] [<ffffffff814d262b>] __do_page_fault+0x39b/0x4c0 > [ 10.920763] [<ffffffff814d2829>] do_page_fault+0x9/0x10 > [ 10.920765] [<ffffffff814cf222>] page_fault+0x22/0x30 > [ 10.920769] [<ffffffff81015b52>] ? x86_perf_event_update+0x2/0x70 > [ 10.920772] [<ffffffff8101de21>] ? intel_pmu_save_and_restart+0x11/0x50 > [ 10.920774] [<ffffffff8101eb02>] intel_pmu_handle_irq+0x142/0x3a0 > [ 10.920777] [<ffffffff814d0655>] perf_event_nmi_handler+0x35/0x60 > [ 10.920779] [<ffffffff814cfe83>] nmi_handle+0x63/0x150 > [ 10.920782] [<ffffffff814cffd3>] default_do_nmi+0x63/0x290 > [ 10.920784] [<ffffffff814d02a8>] do_nmi+0xa8/0xe0 > [ 10.920786] [<ffffffff814cf527>] end_repeat_nmi+0x1e/0x2e > [ 10.920789] [<ffffffff814cf0f0>] ? retint_signal+0x78/0x78 > [ 10.920791] [<ffffffff814cf0f0>] ? retint_signal+0x78/0x78 > [ 10.920793] [<ffffffff814cf0f0>] ? retint_signal+0x78/0x78 > [ 10.920799] <<EOE>> <#DB> [<ffffffff81306b53>] ? acpi_ns_walk_namespace+0x > 98/0x251 > I added some perf events and kmemcheck people to the cc list. This appears to happen during an NMI when faulting in struct perf_sample_data data. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>