[LU-16160] take ldlm lock when queue sync pages

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.3
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: Zhenyu Xu

Description

osc_queue_sync_pages() add osc_extent to osc_object's IO extent list without taking ldlm locks, and then it calls osc_io_unplug_async() to queue the IO work for the client.

I think the IO extent should take ldlm locks while waiting in the IO work queue.

Issue Links

• is related to: LU-16401 various crashes with cl_page_discard vs readhead race
• is related to: LU-16224 rw_seq_cst_vs_drop_caches dies with SIGBUS
• is related to: LU-16156 stale read during IOR test due LU-14541
• is related to: LU-14541 Memory reclaim caused a stale data read
• is related to: LU-15815 fast_read/stale data/reclaim workround causes SIGBUS