[LU-15815] fast_read/stale data/reclaim workround causes SIGBUS

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Andrew Perepechko
• Reporter: John Hammond

Description

The fast_read stale data workaround from LU-14541 can cause applications to receive a spurious SIGBUS when reclaim runs concurrently with page fault handler for mmaped files.

Issue Links

• is duplicated by: LU-15819 Executables run from Lustre may receive spurious SIGBUS signals
• is related to: LU-12587 DIO fallback to Buffer IO unexpectedly
• is related to: LU-16160 take ldlm lock when queue sync pages
• is related to: LU-8633 SIGBUS under memory pressure with fast_read enabled
• is related to: LU-14541 Memory reclaim caused a stale data read