[LU-2272] BUG: spinlock cpu recursion on CPU#2, ll_sa_30972/30992

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Fix Version/s: Lustre 2.7.0
• Affects Version/s: Lustre 2.4.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Oleg Drokin

Description

Running racer with a debugging kernel on master I hit this condition:

[ 8529.226634] BUG: spinlock cpu recursion on CPU#2, ll_sa_30972/30992 (Not tainted)
[ 8529.227125]  lock: ffff88009cb38eb8, .magic: dead4ead, .owner: ptlrpcd_2/7457, .owner_cpu: 2
[ 8529.227595] Pid: 30992, comm: ll_sa_30972 Not tainted 2.6.32-debug #6
[ 8529.227874] Call Trace:
[ 8529.228084]  [<ffffffff8128098a>] ? spin_bug+0xaa/0x100
[ 8529.228342]  [<ffffffff81280ba1>] ? _raw_spin_lock+0x121/0x180
[ 8529.228610]  [<ffffffff814fafde>] ? _spin_lock+0xe/0x10
[ 8529.228892]  [<ffffffffa0d3192c>] ? do_statahead_interpret+0x4c/0xdd0 [lustre]
[ 8529.229426]  [<ffffffff8109011c>] ? remove_wait_queue+0x3c/0x50
[ 8529.229718]  [<ffffffffa0d3690a>] ? ll_statahead_thread+0xcda/0xf40 [lustre]
[ 8529.230008]  [<ffffffff81057d60>] ? default_wake_function+0x0/0x20
[ 8529.230293]  [<ffffffffa0d35c30>] ? ll_statahead_thread+0x0/0xf40 [lustre]
[ 8529.230577]  [<ffffffff8100c14a>] ? child_rip+0xa/0x20
[ 8529.230844]  [<ffffffffa0d35c30>] ? ll_statahead_thread+0x0/0xf40 [lustre]
[ 8529.231142]  [<ffffffffa0d35c30>] ? ll_statahead_thread+0x0/0xf40 [lustre]
[ 8529.231429]  [<ffffffff8100c140>] ? child_rip+0x0/0x20