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Date: Sat, 21 Jun 2014 07:55:04 +0400 From: Nikita Yushchenko <nyushchenko@....rtsoft.ru> To: linux-rt-users@...r.kernel.org CC: 'Alexey Lugovskoy' <lugovskoy@....rtsoft.ru>, Konstantin Kholopov <kkholopov@....rtsoft.ru>, linux-kernel@...r.kernel.org Subject: [v3.10-rt / v3.12-rt] scheduling while atomic in cgroup code 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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