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Message-ID: <001701d239a5$c2665880$47330980$@alibaba-inc.com>
Date: Tue, 08 Nov 2016 17:52:03 +0800
From: "蒋雄伟(蒋冲)" <xiongwei.jiang@...baba-inc.com>
To: <mingo@...hat.com>, <peterz@...radead.org>,
<linux-kernel@...r.kernel.org>
Subject: panic at rb_next when do pick_next_task_fair
Hi,all
We encountered the following panic in 2.6.32 and 3.10.0:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: [] rb_next+0x1/0x50
Call Trace:
? pick_next_task_fair+0x129/0x1d0
[] __schedule+0x12a/0x910
[] schedule+0x29/0x70
[] futex_wait_queue_me+0xc4/0x120
[] futex_wait+0x179/0x280
[] ? hrtimer_get_res+0x50/0x50
[] ? futex_wait_queue_me+0xa2/0x120
[] do_futex+0xfe/0x5b0
[] ? blk_finish_plug+0x14/0x40
[] ? SyS_madvise+0x3c5/0x820
[] SyS_futex+0x80/0x180
[] system_call_fastpath+0x16/0x1b
It seems that after passing the check "if (!cfs_rq->nr_running)" ,
__pick_first_entity sometimes still return NULL, then leads to panic.
Would you please give any advise?
Thanks a lot.
Best regards.
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