Could you please try the following patch from Andrea?
--- 2.4.20pre5aa3/fs/xfs/pagebuf/page_buf.c.~1~ Wed Sep 11 05:17:46 2002
+++ 2.4.20pre5aa3/fs/xfs/pagebuf/page_buf.c Wed Sep 11 06:00:35 2002
@@ -2055,9 +2055,9 @@ pagebuf_iodone_daemon(
spin_unlock_irq(¤t->sigmask_lock);
/* Migrate to the right CPU */
- current->cpus_allowed = 1UL << cpu;
- while (smp_processor_id() != cpu)
- schedule();
+ set_cpus_allowed(current, 1UL << cpu);
+ if (cpu() != cpu)
+ BUG();
sprintf(current->comm, "pagebuf_io_CPU%d", bind_cpu);
INIT_LIST_HEAD(&pagebuf_iodone_tq[cpu]);
-
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