ltp测试套件-pthread_rwlock_unlock_3-1分析记录

最近在linux-4.14版本内核上做ltp测试，其中pthread_rwlock_unlock_3-1用例测试不通过，然后我又在各种其他linux系统上做测试，都没有通过。

Test failed: reader did not get the lock when writer1 release the lock

[root@aarch64 ]# 
[root@aarch64 ]# ./31 
current->pid==================762
main: write lock
main: create writer1, with priority: 3
current->pid==================763
writer1: attempt write lock
[   19.909236] [futex]:cmd=0
[   19.922086] [futex_wait]:uaddr=0x4122ec,val=0x0,flags=0x0,q=432536544,hb=0x1d9a9880
[   19.930751] [futex_wait]:cur->comm=31[763], prio=96,normal=96,static=120,rt=3
main: create reader, with priority: 3
current->pid==================764
reader: attempt read lock
[   23.939710] [futex]:cmd=0
[   23.940431] [futex_wait]:uaddr=0x4122e8,val=0x0,flags=0x0,q=432421856,hb=0x1d9a5800
[   23.941358] [futex_wait]:cur->comm=31[764], prio=96,normal=96,static=120,rt=3
main: create writer2, with priority: 1
current->pid==================765
writer2: attempt write lock
[   26.955703] [futex]:cmd=0
[   26.957442] [futex_wait]:uaddr=0x4122ec,val=0x0,flags=0x0,q=432438240,hb=0x1d9a9880
[   26.962222] [futex_wait]:cur->comm=31[765], prio=98,normal=98,static=120,rt=1
main: release write lock
[   30.971308] [futex]:cmd=1
[   30.977258] [futex_wake]:cur->comm=31[762], prio=95,normal=95,static=120,rt=4,nr_wake=1
[   30.981579] futex_wake 1534: pi_state=0,rt_waiter=0
[   30.985314] futex_wake 1540: this->bitset=-1,bitset=-1
[   30.993699] [mark_wake_futex]:this->comm=31[763], prio=96,normal=96,static=120,rt=3
[   30.999326] [futex_wait]:cur->comm=31[763], prio=96,normal=96,static=120,rt=3
writer1: acquired write lock
[   32.003246] [futex]:cmd=0
[   32.006304] [futex_wait]:uaddr=0x7a5c32d0,val=0x2fb,flags=0x1,q=432520160,hb=0x1d9ad300
[   32.016090] [futex_wait]:cur->comm=31[762], prio=95,normal=95,static=120,rt=4
writer1: unlock write lock
[   32.026474] [futex]:cmd=1
[   32.032413] [futex_wake]:cur->comm=31[763], prio=96,normal=96,static=120,rt=3,nr_wake=1
[   32.037957] futex_wake 1534: pi_state=0,rt_waiter=0
[   32.043483] futex_wake 1540: this->bitset=-1,bitset=-1
[   32.049854] [mark_wake_futex]:this->comm=31[765], prio=98,normal=98,static=120,rt=1
[   32.057541] [futex_wait]:cur->comm=31[765], prio=98,normal=98,static=120,rt=1
writer2: acquired writer lock
[   32.097924] [futex]:cmd=1
[   32.115272] [futex]:cmd=1
[   32.117555] [futex_wake]:cur->comm=31[763], prio=96,normal=96,static=120,rt=3,nr_wake=1
[   32.120352] futex_wake 1534: pi_state=0,rt_waiter=0
[   32.122273] futex_wake 1540: this->bitset=-1,bitset=-1
[   32.127844] [mark_wake_futex]:this->comm=31[762], prio=95,normal=95,static=120,rt=4
[   32.130623] [futex_wait]:cur->comm=31[762], prio=95,normal=95,static=120,rt=4
Test failed: reader did not get the lock when writer1 release the lock
[   36.176507] [futex_wait]:cur->comm=31[764], prio=96,normal=96,static=120,rt=3
[   36.180772] [futex]:cmd=1
[   36.185278] [futex]:cmd=1
[root@aarch64 ]#