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 or any other command?
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
[ 264.177093] hongkong 0000:00:0b.0: FPGA version 0.7 card type 4 version
0.1 slot 5 (15) status 0x6536
[ 264.186579] hongkong 0000:00:0b.0: HD downloaded by EFI, bypass Hongkong
driver download procedure.
[ 264.194566] hongkong 0000:00:0b.0: registering i2c-hk-0
[ 264.199557] hongkong 0000:00:0b.0: registering i2c-hk-1
[ 264.204027] hongkong 0000:00:0b.0: registering i2c-hk-2
[ 264.208243] hongkong 0000:00:0b.0: registering i2c-hk-3
[ 264.213244] SSC NVRAM: addr=0xf2100000 size=0x100000 flags=0x40200
[ 264.242258] se-klognv: unable to open rtc device (rtc0)
[ 264.342638] input: ImExPS/2 Generic Explorer Mouse as
/devices/platform/i8042/serio1/input/input1
*[ 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
Name ID Mem VCPUs State
Time(s)
Domain-0 0 8151 4 r-----
229.5
pvm-01-6 1 8187 4 r-----
244.1
xentop - 21:43:07 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 free CPUs: 40 @ 2200MHz
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%)
VCPUS
NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR VBD_RSECT
VBD_WSECT SS
ID
Domain-0 -----r 246 54.4 8346880 12.4 no limit
n/a 4
0 0 0 0 0 0 0 0
0
0
pvm-01-6 -----r 337 104.2 8384476 12.5 8389632
12.5 4
4 654 0 1 0 0 0 0
0
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