[LU-2047] kernel paging request in ldlm_server_glimpse_ast()

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Severity: 3
• Assignee: Johann Lombardi (Inactive)
• Reporter: Johann Lombardi (Inactive)

Description

Alex has reported the following crash:

BUG: unable to handle kernel paging request at 00000000ffffff9d
IP: [<ffffffffa0026e11>] ldlm_server_glimpse_ast+0x91/0x3b0 [ptlrpc]
[<ffffffffa0001479>] ldlm_work_gl_ast_lock+0x79/0x260 [ptlrpc]
 [<ffffffffa0042516>] ptlrpc_set_wait+0x76/0x8c0 [ptlrpc]
 [<ffffffff8105042f>] ? __init_waitqueue_head+0x1f/0x40
 [<ffffffffa02286c0>] ? cfs_waitq_init+0x10/0x20 [libcfs]
 [<ffffffffa0037890>] ? ptlrpc_prep_set+0x160/0x390 [ptlrpc]
 [<ffffffffa0006b7e>] ldlm_run_ast_work+0x14e/0x450 [ptlrpc]
 [<ffffffffa0026456>] ldlm_glimpse_locks+0x36/0xf0 [ptlrpc]
 [<ffffffffa07b1ec4>] filter_intent_policy+0x334/0x810 [obdfilter]

The issue is that filter_intent_policy() should set gl_work.gl_desc to NULL as done in ofd_intent_policy.