Re: [LKP] Re: [mm/vmalloc] 5c1f4e690e: BUG:sleeping_function_called_from_invalid_context_at_mm/page_alloc.c

[Chen, Rong A]

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@xxxxxxxxx> 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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