Avi Kivity wrote:
On 11/26/2009 03:35 AM, Andrew Theurer wrote:
NMI backtrace for cpu 9
CPU 9:
Modules linked in: tun sunrpc af_packet bridge stp ipv6 binfmt_misc
dm_mirror dm_region_hash dm_log dm_multipath scsi_dh dm_mod kvm_intel
kvm uinput sr_mod cdrom ata_generic pata_acpi ata_piix joydev libata
ide_pci_generic usbhid ide_core hid serio_raw cdc_ether usbnet mii
matroxfb_base matroxfb_DAC1064 matroxfb_accel matroxfb_Ti3026
matroxfb_g450 g450_pll matroxfb_misc iTCO_wdt i2c_i801 i2c_core
pcspkr iTCO_vendor_support ioatdma thermal rtc_cmos rtc_core bnx2
rtc_lib dca thermal_sys hwmon sg button shpchp pci_hotplug qla2xxx
scsi_transport_fc scsi_tgt sd_mod scsi_mod crc_t10dif ext3 jbd
mbcache uhci_hcd ohci_hcd ehci_hcd usbcore [last unloaded: processor]
Pid: 5687, comm: qemu-system-x86 Not tainted
2.6.32-rc7-5e8cb552cb8b48244b6d07bff984b3c4080d4bc9-autokern1 #1
-[7947AC1]-
RIP: 0010:[<ffffffff810b802b>] [<ffffffff810b802b>]
fire_user_return_notifiers+0x31/0x36
RSP: 0018:ffff88095024df08 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000800 RCX: ffff88095024c000
RDX: ffff880028340000 RSI: 0000000000000000 RDI: ffff88095024df58
RBP: ffff88095024df18 R08: 0000000000000000 R09: 0000000000000001
R10: 000000caf1fff62d R11: ffff8805b584de40 R12: 00007fffae48e0f0
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS: 00007f45c69d57c0(0000) GS:ffff880028340000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: fffff9800121056e CR3: 0000000953d36000 CR4: 00000000000026e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
<#DB[1]> <<EOE>> Pid: 5687, comm: qemu-system-x86 Not tainted
2.6.32-rc7-5e8cb552cb8b48244b6d07bff984b3c4080d4bc9-autokern1 #1
Call Trace:
<NMI> [<ffffffff8100af53>] ? show_regs+0x44/0x49
[<ffffffff812e57b2>] nmi_watchdog_tick+0xc2/0x1b9
[<ffffffff812e4e73>] do_nmi+0xb0/0x252
[<ffffffff812e48a0>] nmi+0x20/0x30
[<ffffffff810b802b>] ? fire_user_return_notifiers+0x31/0x36
<<EOE>> [<ffffffff8100b844>] do_notify_resume+0x62/0x69
[<ffffffff8100bf48>] ? int_check_syscall_exit_work+0x9/0x3d
[<ffffffff8100bf8e>] int_signal+0x12/0x17
That's a bug with the new user return notifiers. Is your host kernel
preemptible?
preempt is off.
I think I saw this once but I'm not sure. I can't reproduce with a host
kernel build, some silly guest workload, and 'perf top' to generate an
nmi load.
-Andrew
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