[Xen-users] vCPUs are in 'b' (blocked) state: How to debug?

[Saurabh Mishra <saurabh.globe@xxxxxxxxx>]

Hi,

We saw CPU stalls in the VM and noticed 3/4 vCPUs are in blocked state. How can we debug this kind of problem? What can we capture through xl debug-key command orÂany otherÂcommand?

xl vpcu-list showed that three vCPUs out of 4 are in blocked state. We are using 'Xen 4.2.4_02-0.7.1'.

ssc-lc-6:/var/log # tail pvm_console.log

[Â 264.177093] hongkong 0000:00:0b.0: FPGA version 0.7 card type 4 version 0.1 slot 5 (15) status 0x6536

[Â 264.186579] hongkong 0000:00:0b.0: HD downloaded by EFI, bypass Hongkong driver download procedure.

[Â 264.194566] hongkong 0000:00:0b.0: registering i2c-hk-0

[Â 264.199557] hongkong 0000:00:0b.0: registering i2c-hk-1

[Â 264.204027] hongkong 0000:00:0b.0: registering i2c-hk-2

[Â 264.208243] hongkong 0000:00:0b.0: registering i2c-hk-3

[Â 264.213244] SSC NVRAM: addr=0xf2100000 size=0x100000 flags=0x40200

[Â 264.242258] se-klognv: unable to open rtc device (rtc0)

[Â 264.342638] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input1

[Â 324.244724] INFO: rcu_sched_state detected stalls on CPUs/tasks: { 3} (detected by 0, t=60002 jiffies)

ssc-lc-6:/var/log # xl list

NameÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ IDÂÂ Mem VCPUsÂÂ StateÂÂÂÂÂÂ Time(s)

Domain-0ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ 0Â 8151ÂÂÂÂ 4ÂÂÂÂ r-----ÂÂÂÂ 229.5

pvm-01-6ÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂÂ 1Â 8187ÂÂÂÂ 4ÂÂÂÂ r-----ÂÂÂÂ 244.1

xentop - 21:43:07ÂÂ Xen 4.2.4_02-0.7.1

2 domains: 2 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown

Mem: 67095560k total, 17930632k used, 49164928k freeÂÂÂ CPUs: 40 @ 2200MHz

ÂÂÂÂÂ NAMEÂ STATEÂÂ CPU(sec) CPU(%)ÂÂÂÂ MEM(k) MEM(%)Â MAXMEM(k) MAXMEM(%) VCPUS

NETS NETTX(k) NETRX(k) VBDSÂÂ VBD_OOÂÂ VBD_RDÂÂ VBD_WRÂ VBD_RSECTÂ VBD_WSECT SS

ID

 Domain-0 -----r 246 54.4 8346880 12.4 no limit n/a 4

ÂÂÂ 0ÂÂÂÂ ÂÂÂ0ÂÂÂÂÂÂÂ 0ÂÂÂ 0ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂÂÂ 0

0

 pvm-01-6 -----r 337 104.2 8384476 12.5 8389632 12.5 4

ÂÂÂ 4ÂÂÂÂÂ 654ÂÂÂÂÂÂÂ 0ÂÂÂ 1ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂÂÂ 0ÂÂÂÂÂÂÂÂÂ 0

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