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Date: Sat, 18 Feb 2017 00:53:12 +0100 From: Gabriel C <nix.or.die@...il.com> To: Cong Wang <xiyou.wangcong@...il.com> Cc: lkml <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, "David S. Miller" <davem@...emloft.net>, "Peter Zijlstra (Intel)" <peterz@...radead.org> Subject: Re: e1000_netpoll() , BUG: sleeping function called from invalid context On 18.02.2017 00:44, Cong Wang wrote: > On Fri, Feb 17, 2017 at 3:38 PM, Gabriel C <nix.or.die@...il.com> wrote: >> >> My card seems to use the e1000e driver which is buit-in.. >> >> Anyway here an objdump -x : >> >> http://ftp.frugalware.org/pub/other/people/crazy/kernel/t/objdump-x_e1000.ko.txt >> > > Found disable_hardirq() but not disable_irq(). > > Are you sure the kernel warning was emitted by this binary rather than > some old one? > Yes , I use an clean build , remove any other files in /boot && /lib/modules before installing the new build kernel. I've asked Thomas before I send this to lkml and to you and he said : .. It's a real issue. netconsole calls disable_irq() which might sleep from an interrupt and preemption disabled context. > [85362.132801] __might_sleep+0x6b/0x80 > [85362.132803] synchronize_irq+0x33/0x90 > [85362.132805] ? __irq_put_desc_unlock+0x19/0x40 > [85362.132807] ? __disable_irq_nosync+0x4e/0x60 > [85362.132808] disable_irq+0x17/0x20 > [85362.132810] e1000_netpoll+0x3d/0x110 Though, what's weird is that the e1000_netpoll() does not longer call disable_irq(). It calls disable_hardirq(). That got changed in commit 3111912971251 which got into Linus tree during the 4.10 merge window. So it is in 4.10-rc8. Confused. ...
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