Messages in this thread | | | Date | Sat, 14 Jul 2012 21:48:49 +0800 | From | Fengguang Wu <> | Subject | Re: Kernel boot hangs on commit "switch fput to task_work_add" |
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On Sat, Jul 14, 2012 at 02:05:10PM +0100, Al Viro wrote: > On Tue, Jul 10, 2012 at 10:18:30PM +0800, wfg@linux.intel.com wrote: > > Hi Al, > > > > The linux-next kernel reliably hung after this line: > > > > [ 4.846260] debug: unmapping init [mem 0xffff88000182a000-0xffff8800019fffff] > > > > And it's bisected to commit: > > > > commit 4a9ffe81385c2af04f296bea05482f34e02ea10d > > Author: Al Viro <viro@zeniv.linux.org.uk> > > Date: Sun Jun 24 09:56:45 2012 +0400 > > > > switch fput to task_work_add > > > > ... and schedule_work() for interrupt/kernel_thread callers > > (and yes, now it *is* OK to call from interrupt). > > > > I tried add this debug aid: > > > > init_post(void): > > + printk(KERN_WARNING "flush_delayed_fput\n"); > > flush_delayed_fput(); > > + printk(KERN_WARNING "flush_delayed_fput done\n"); > > > > And then it hangs after "flush_delayed_fput done". So it's not directly > > freezing inside flush_delayed_fput().. > > Could you post a stack trace, etc.? I'll try to reproduce that one, obviously, > but...
Hi Al, here I got the output for
(qemu) sendkey alt-sysrq-l (qemu) sendkey alt-sysrq-t
Thanks, Fengguang
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