Bug 28268 - nptl: Handle robust PI mutexes for !__ASSUME_SET_ROBUST_LIST
Summary: nptl: Handle robust PI mutexes for !__ASSUME_SET_ROBUST_LIST
Status: NEW
Alias: None
Product: glibc
Classification: Unclassified
Component: nptl (show other bugs)
Version: 2.35
: P2 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
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Reported: 2021-08-26 12:02 UTC by Adhemerval Zanella
Modified: 2021-08-26 12:02 UTC (History)
1 user (show)

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Description Adhemerval Zanella 2021-08-26 12:02:47 UTC 
The robust PI mutexes are signaled by setting the LSB bit to 1, so the code requires to take this consideration before access the __pthread_mutex_s. 
This a bug on only visible on a handful of architectures where 
__NR_set_robust_list is not support due the missing CONFIG_HAVE_FUTEX_CMPXCHG.