Zhao Yongming created TS-2205:
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Summary: AIO caused system hang
Key: TS-2205
URL: https://issues.apache.org/jira/browse/TS-2205
Project: Traffic Server
Issue Type: Bug
Components: Cache
Reporter: Zhao Yongming
the system may hang with AIO thread CPU usage rising:
{code}
top - 17:10:46 up 38 days, 22:43, 2 users, load average: 11.34, 2.97, 2.75
Tasks: 512 total, 55 running, 457 sleeping, 0 stopped, 0 zombie
Cpu(s): 6.9%us, 54.8%sy, 0.0%ni, 37.3%id, 0.0%wa, 0.0%hi, 0.9%si, 0.0%st
Mem: 65963696k total, 64318444k used, 1645252k free, 241496k buffers
Swap: 33554424k total, 20416k used, 33534008k free, 14864188k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
32498 ats 20 0 59.3g 45g 25m R 65.8 72.1 24:44.15 [ET_AIO 5]
3213 root 20 0 0 0 0 S 15.4 0.0 13:38.32 kondemand/7
3219 root 20 0 0 0 0 S 15.1 0.0 16:32.78 kondemand/13
4 root 20 0 0 0 0 S 13.8 0.0 33:18.13 ksoftirqd/0
13 root 20 0 0 0 0 S 13.4 0.0 21:45.18 ksoftirqd/2
37 root 20 0 0 0 0 S 13.4 0.0 19:42.34 ksoftirqd/8
45 root 20 0 0 0 0 S 13.4 0.0 18:31.17 ksoftirqd/10
32483 ats 20 0 59.3g 45g 25m R 13.4 72.1 16:47.14 [ET_AIO 6]
32487 ats 20 0 59.3g 45g 25m R 13.4 72.1 16:46.93 [ET_AIO 2]
25 root 20 0 0 0 0 S 13.1 0.0 19:02.18 ksoftirqd/5
65 root 20 0 0 0 0 S 13.1 0.0 19:24.04 ksoftirqd/15
32477 ats 20 0 59.3g 45g 25m R 13.1 72.1 16:32.90 [ET_AIO 0]
32478 ats 20 0 59.3g 45g 25m R 13.1 72.1 16:49.77 [ET_AIO 1]
32479 ats 20 0 59.3g 45g 25m S 13.1 72.1 16:41.77 [ET_AIO 2]
32481 ats 20 0 59.3g 45g 25m R 13.1 72.1 16:50.40 [ET_AIO 4]
32482 ats 20 0 59.3g 45g 25m R 13.1 72.1 16:47.42 [ET_AIO 5]
32484 ats 20 0 59.3g 45g 25m R 13.1 72.1 16:25.81 [ET_AIO 7]
32485 ats 20 0 59.3g 45g 25m S 13.1 72.1 16:52.71 [ET_AIO 0]
32486 ats 20 0 59.3g 45g 25m S 13.1 72.1 16:51.69 [ET_AIO 1]
32491 ats 20 0 59.3g 45g 25m S 13.1 72.1 16:50.58 [ET_AIO 6]
32492 ats 20 0 59.3g 45g 25m S 13.1 72.1 16:49.12 [ET_AIO 7]
32480 ats 20 0 59.3g 45g 25m S 12.8 72.1 16:47.39 [ET_AIO 3]
32488 ats 20 0 59.3g 45g 25m R 12.8 72.1 16:52.16 [ET_AIO 3]
32489 ats 20 0 59.3g 45g 25m S 12.8 72.1 16:50.79 [ET_AIO 4]
32490 ats 20 0 59.3g 45g 25m R 12.8 72.1 16:52.61 [ET_AIO 5]
{code}
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