From: Nikita Yushchenko <nyushchenko@dev.rtsoft.ru>
To: linux-rt-users@vger.kernel.org
Cc: "'Alexey Lugovskoy'" <lugovskoy@dev.rtsoft.ru>,
Konstantin Kholopov <kkholopov@dev.rtsoft.ru>,
linux-kernel@vger.kernel.org
Subject: [v3.10-rt / v3.12-rt] scheduling while atomic in cgroup code
Date: Sat, 21 Jun 2014 07:55:04 +0400 [thread overview]
Message-ID: <53A50218.6020506@dev.rtsoft.ru> (raw)
Hi.
Call Trace:
[e22d5a90] [c0007ea8] show_stack+0x4c/0x168 (unreliable)
[e22d5ad0] [c0618c04] __schedule_bug+0x94/0xb0
[e22d5ae0] [c060b9ec] __schedule+0x530/0x550
[e22d5bf0] [c060bacc] schedule+0x30/0xbc
[e22d5c00] [c060ca24] rt_spin_lock_slowlock+0x180/0x27c
[e22d5c70] [c00b39dc] res_counter_uncharge_until+0x40/0xc4
[e22d5ca0] [c013ca88] drain_stock.isra.20+0x54/0x98
[e22d5cc0] [c01402ac] __mem_cgroup_try_charge+0x2e8/0xbac
[e22d5d70] [c01410d4] mem_cgroup_charge_common+0x3c/0x70
[e22d5d90] [c0117284] __do_fault+0x38c/0x510
[e22d5df0] [c011a5f4] handle_pte_fault+0x98/0x858
[e22d5e50] [c060ed08] do_page_fault+0x42c/0x6fc
[e22d5f40] [c000f5b4] handle_page_fault+0xc/0x80
What happens:
- refill_stock() calls get_cpu_var() and thus disables preemption until
matching put_cpu_var() is called,
- then it calls drain_stock() -> res_counter_uncharge() ->
res_counter_uncharge_until()
- and here we have spin_lock(), which under RT can sleep. Thus we have
sleeping with preemption disabled.
Any ideas how to fix?
next reply other threads:[~2014-06-21 3:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-21 3:55 Nikita Yushchenko [this message]
2014-06-21 8:09 ` [v3.10-rt / v3.12-rt] scheduling while atomic in cgroup code Mike Galbraith
2015-02-17 9:28 ` Sebastian Andrzej Siewior
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