linux-kernel - 2.6.19.1-rt15: BUG in __tasklet_action at kernel/softirq.c:568

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Date:	Mon, 18 Dec 2006 10:48:27 -0700
From:	"Robert Crocombe" <rcrocomb@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	"Ingo Molnar" <mingo@...e.hu>
Subject: 2.6.19.1-rt15: BUG in __tasklet_action at kernel/softirq.c:568

Almost exactly 24 hours after booting 2.6.19.1-rt15, I encountered the
following:

softirq-tasklet/49[CPU#3]: BUG in __tasklet_action at kernel/softirq.c:568

Call Trace:
 [<ffffffff8027aca3>] __WARN_ON+0x5c/0x74
 [<ffffffff8027c6e6>] __tasklet_action+0xae/0xf2
 [<ffffffff8027cccd>] ksoftirqd+0xfc/0x198
 [<ffffffff8027cbd1>] ksoftirqd+0x0/0x198
 [<ffffffff8022ed5b>] kthread+0xd1/0x101
 [<ffffffff80257bb8>] child_rip+0xa/0x12
 [<ffffffff8022ec8a>] kthread+0x0/0x101
 [<ffffffff80257bae>] child_rip+0x0/0x12

softirq-tasklet/36[CPU#2]: BUG in __tasklet_action at kernel/softirq.c:568

Call Trace:
 [<ffffffff8027aca3>] __WARN_ON+0x5c/0x74
 [<ffffffff8027c6e6>] __tasklet_action+0xae/0xf2
 [<ffffffff8027cccd>] ksoftirqd+0xfc/0x198
 [<ffffffff8027cbd1>] ksoftirqd+0x0/0x198
 [<ffffffff8022ed5b>] kthread+0xd1/0x101
 [<ffffffff80257bb8>] child_rip+0xa/0x12
 [<ffffffff8022ec8a>] kthread+0x0/0x101
 [<ffffffff80257bae>] child_rip+0x0/0x12

softirq-tasklet/49[CPU#3]: BUG in __tasklet_action at kernel/softirq.c:568

Call Trace:
 [<ffffffff8027aca3>] __WARN_ON+0x5c/0x74
 [<ffffffff8027c6e6>] __tasklet_action+0xae/0xf2
 [<ffffffff8027cccd>] ksoftirqd+0xfc/0x198
 [<ffffffff8027cbd1>] ksoftirqd+0x0/0x198
 [<ffffffff8022ed5b>] kthread+0xd1/0x101
 [<ffffffff80257bb8>] child_rip+0xa/0x12
 [<ffffffff8022ec8a>] kthread+0x0/0x101
 [<ffffffff80257bae>] child_rip+0x0/0x12

softirq-tasklet/49[CPU#3]: BUG in __tasklet_action at kernel/softirq.c:568

Call Trace:
 [<ffffffff8027aca3>] __WARN_ON+0x5c/0x74
 [<ffffffff8027c6e6>] __tasklet_action+0xae/0xf2
 [<ffffffff8027cccd>] ksoftirqd+0xfc/0x198
 [<ffffffff8027cbd1>] ksoftirqd+0x0/0x198
 [<ffffffff8022ed5b>] kthread+0xd1/0x101
 [<ffffffff80257bb8>] child_rip+0xa/0x12
 [<ffffffff8022ec8a>] kthread+0x0/0x101
 [<ffffffff80257bae>] child_rip+0x0/0x12

I had set the machine to do 1,000 kernel compiles the day before, but
it might have been finished by then (the BUG triggered on a Saturday).
 I did this because it was kernel compiles that previously triggered a
hard lockup on -rt kernels.  The machine seems to still be usable, and
the compiles all completed.

The referenced line is:
                /*
                 * After this point on the tasklet might be rescheduled
                 * on another CPU, but it can only be added to another
                 * CPU's tasklet list if we unlock the tasklet (which we
                 * dont do yet).
                 */
                if (!test_and_clear_bit(TASKLET_STATE_SCHED, &t->state))
                        WARN_ON(1);

This is a quad Opteron.  Config attached.

-- 
Robert Crocombe

Download attachment "config_2.6.19.1-rt15" of type "application/octet-stream" (24400 bytes)