Messages in this thread | | | Date | Fri, 14 Nov 2014 21:39:52 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: x86 math_error warning in Linux kernel 3.10 |
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On Fri, 14 Nov 2014, Borislav Petkov wrote: > On Fri, Nov 14, 2014 at 12:19:16PM -0800, Vinson Lee wrote: > > Hi. > > > > We hit this x86 math_error warning in Linux kernel 3.10. > > > > ------------[ cut here ]------------ > > WARNING: at arch/x86/include/asm/fpu-internal.h:524 math_error+0xd1/0x219() > > Modules linked in: cls_basic act_mirred cls_u32 veth sch_ingress > > netconsole configfs ipv6 dm_multipath scsi_dh video sbs sbshc hed > > acpi_pad acpi_ipmi acpi_i2c parport_pc lp parport tcp_diag inet_diag > > ipmi_si ipmi_devintf ipmi_msghandler dell_rbu sg iTCO_wdt > > iTCO_vendor_support dcdbas igb i2c_algo_bit ptp pps_core shpchp > > lpc_ich i2c_i801 mfd_core i2c_core ioatdma dca i7core_edac edac_core > > microcode freq_table mperf ahci libahci libata sd_mod scsi_mod > > CPU: 2 PID: 53182 Comm: java Not tainted 3.10.50 #1 > > 0000000000000000 ffff8808e1f5be38 ffffffff8146cb74 ffff8808e1f5be70 > > ffffffff8103cbf9 0000000000000000 ffff88090b2c9730 ffff8808e1f5bf58 > > 0000000000000010 0000000000000000 ffff8808e1f5be80 ffffffff8103ccbf > > Call Trace: > > [<ffffffff8146cb74>] dump_stack+0x19/0x1b > > [<ffffffff8103cbf9>] warn_slowpath_common+0x65/0x7d > > [<ffffffff8103ccbf>] warn_slowpath_null+0x1a/0x1c > > [<ffffffff8100317b>] math_error+0xd1/0x219 > > [<ffffffff81007f6c>] ? read_tsc+0x9/0x19 > > [<ffffffff8107bab8>] ? timekeeping_get_ns.constprop.10+0x11/0x36 > > [<ffffffff8107bf32>] ? ktime_get+0x68/0x76 > > [<ffffffff81007f6c>] ? read_tsc+0x9/0x19 > > [<ffffffff8107bab8>] ? timekeeping_get_ns.constprop.10+0x11/0x36 > > [<ffffffff810032d6>] do_coprocessor_error+0x13/0x15 > > [<ffffffff81478a38>] coprocessor_error+0x18/0x20 > > ---[ end trace 3e4a6532a67ba6d3 ]--- > > AFAICT, you're getting an FPU exception for a task which hasn't used the > FPU or current is somehow pointing to the wrong task. > > Can you trigger this with the latest kernel too, i.e., say, 3.18-rc4?
Also Vinson forgot to mention HOW that is triggered. Without an explanation of the reproducer it's hard to tell what's going wrong.
Thanks,
tglx
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