linux-kernel - Re: [LKP] Re: [mm/vmalloc] 5c1f4e690e: BUG:sleeping_function_called_from_invalid_context_at_mm/page

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Message-ID: <2f012f0a-11f5-ba3c-65b0-027eed5bcb98@intel.com>
Date:   Wed, 14 Jul 2021 16:48:16 +0800
From:   "Chen, Rong A" <rong.a.chen@...el.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        kernel test robot <oliver.sang@...el.com>
Cc:     Uladzislau Rezki <urezki@...il.com>, Mel Gorman <mgorman@...e.de>,
        Hillf Danton <hdanton@...a.com>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        kernel test robot <lkp@...el.com>
Subject: Re: [LKP] Re: [mm/vmalloc] 5c1f4e690e:
 BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c



On 7/14/2021 3:52 AM, Linus Torvalds wrote:
> [ I've asked for this before, but I'll ask for it again.. ]
> 
> On Tue, Jul 13, 2021 at 7:06 AM kernel test robot <oliver.sang@...el.com> wrote:
>>
>>
>> [  131.014885] BUG: sleeping function called from invalid context at mm/page_alloc.c:4992
>> [  131.019428] in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 2928, name: trinity-c6
>> [  131.023996] no locks held by trinity-c6/2928.
>> [  131.027987] irq event stamp: 283042
>> [  131.031844] hardirqs last  enabled at (283041): [<ffffffff8643af22>] _raw_spin_unlock_irqrestore+0x42/0x50
>> [  131.036625] hardirqs last disabled at (283042): [<ffffffff81656d71>] __alloc_pages_bulk+0xae1/0xf20
>> [  131.041305] softirqs last  enabled at (281858): [<ffffffff86800623>] __do_softirq+0x623/0x9db
>> [  131.046157] softirqs last disabled at (281853): [<ffffffff8116dfee>] irq_exit_rcu+0xce/0xf0
>> [  131.050925] CPU: 0 PID: 2928 Comm: trinity-c6 Not tainted 5.13.0+ #1
>> [  131.055391] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
>> [  131.060133] Call Trace:
>> [  131.064110]  dump_stack+0xa5/0xe6
>> [  131.068192]  ___might_sleep.cold+0x147/0x177
>> [  131.072324]  __alloc_pages+0x462/0x650
> 
> Btw, can I ask the kernel test robot to do the same thing I asked
> syzbot to do - namely get better backtrace annotations?

Hi Linus,

Sorry for this, we enabled COMPILE_TEST for randconfig which is conflict
with DEBUG_INFO, then "scripts/decode_stacktrace.sh" was ignored in this
case, we'll fix it asap and have a double check next time.

Best Regards,
Rong Chen


> 
> It requires debug info in the kernel (but I think DEBUG_INFO_REDUCED
> is sufficient, no need for the full one that blows sizes up a lot),
> but it makes things _soo_ much easier to read. Not just because of
> line numbers, but particularly with inlining information.
> 
> It's easy enough to do: just run the kernel output through
> "scripts/decode_stacktrace.sh".
> 
> That will also do the "Code:" line instruction disassembly, which is
> less critical, since that can be done later at any time with no loss
> of information, but it can be a convenience.
> 
>                 Linus
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