[LU-15014] lu_ref_add() called in atomic context

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0, Lustre 2.15.0
• Affects Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: James A Simmons
• Reporter: James A Simmons

Description

With the reintroduction of lu_ref to the native Linux client I turned on this functionality and started to test it. In my testing I saw the following errors:

[ 2885.946815] Call Trace:

[ 2885.951240]  dump_stack+0x68/0x9b

[ 2885.956523]  ___might_sleep+0x205/0x260

[ 2885.962245]  lu_ref_add+0x25/0x40 [obdclass]

[ 2885.968442]  vvp_pgcache_current+0x101/0x1a0 [lustre]

[ 2885.975370]  seq_read+0x1ab/0x3c0

 

and

 

[ 7042.102529]  dump_stack+0x68/0x9b

[ 7042.107328]  ___might_sleep+0x205/0x260

[ 7042.112647]  lu_ref_add+0x25/0x40 [obdclass]

[ 7042.118385]  mdc_lock_upcall+0x154/0x4d0 [mdc]

[ 7042.124275]  mdc_enqueue_send+0x508/0x580 [mdc]

[ 7042.130225]  ? mdc_lock_lvb_update+0x280/0x280 [mdc]

 

Its an easy fix that is missed since lu_ref is never tested on the OpenSFS branch.