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Message-ID: <552FD643.8070408@linutronix.de> Date: Thu, 16 Apr 2015 17:33:23 +0200 From: Sebastian Andrzej Siewior <bigeasy@...utronix.de> To: Jan Kiszka <jan.kiszka@...mens.com>, Steven Rostedt <rostedt@...dmis.org> CC: RT <linux-rt-users@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RT 3.18] ring-buffer: Mark irq_work as HARD_IRQ to prevent deadlocks On 04/16/2015 05:29 PM, Jan Kiszka wrote: > My patch is definitely not OK. It causes > > [ 380.372579] BUG: scheduling while atomic: trace-cmd/2149/0x00010004 > ... > [ 380.372604] Call Trace: > [ 380.372610] <IRQ> [<ffffffff81607694>] dump_stack+0x50/0x9f > [ 380.372613] [<ffffffff8160413c>] __schedule_bug+0x59/0x69 > [ 380.372615] [<ffffffff8160a1d5>] __schedule+0x675/0x800 > [ 380.372617] [<ffffffff8160a394>] schedule+0x34/0xa0 > [ 380.372619] [<ffffffff8160bf7d>] rt_spin_lock_slowlock+0xcd/0x290 > [ 380.372621] [<ffffffff8160d8b5>] rt_spin_lock+0x25/0x30 > [ 380.372623] [<ffffffff8108fe39>] __wake_up+0x29/0x60 right. you must not take any sleeping locks in the hardirq context :) This works for the no-hz-work thingy. It grabs raw locks and may cancel one hrtimer which is marked irqsafe. Sebastian -- 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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