On 2017-07-30, at 2:47 AM, Meelis Roos wrote:
>>> [ 1.940000] [<000000004011b4a4>] pdc_stable_init+0x2c4/0x458
>>
>> I don't see this symbol in my build. I see pdc_stable_initialize.
>>
>> Do you have a patch installed?
>
> No, pristine v4.13-rc2-110-g0b5477d9dabd git.
James is correct about pdc_stable_init. It is enabled by CONFIG_PDC_STABLE.
In the backtrace,
[ 1.936053] BUG: sleeping function called from invalid context at mm/slab.h:416
[ 1.936243] in_atomic(): 1, irqs_disabled(): 0, pid: 1, name: swapper/0
[ 1.936601] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.13.0-rc2-00110-g0b5477d9dabd #111
[ 1.936828] Backtrace:
[ 1.936889] [<0000000040217ac8>] show_stack+0x20/0x38
[ 1.939036] [<00000000406fbbb0>] dump_stack+0xb0/0x128
[ 1.939174] [<0000000040274090>] ___might_sleep+0x180/0x1b8
[ 1.940000] [<0000000040274144>] __might_sleep+0x7c/0xe8
[ 1.940000] [<0000000040373874>] kmem_cache_alloc+0x14c/0x1e0
[ 1.940000] [<0000000040419514>] __kernfs_new_node+0x84/0x1b8
[ 1.940000] [<000000004041b09c>] kernfs_new_node+0x3c/0x78
[ 1.940000] [<000000004041e040>] kernfs_create_link+0x40/0xd8
[ 1.940000] [<000000004041f320>] sysfs_do_create_link_sd.isra.0+0xb0/0x130
[ 1.940000] [<000000004041f3d4>] sysfs_create_link+0x34/0x58
[ 1.940000] [<000000004011b4a4>] pdc_stable_init+0x2c4/0x458
I don't know how we got to sysfs_create_link. It is probably from here:
/* Don't forget the root entries */
error = sysfs_create_group(stable_kobj, &pdcs_attr_group);
Presumably, this is the sleeping function but it's not clear how the incorrect context arises.
Maybe there is an errant spin_lock somewhere. For example, see:
https://lkml.org/lkml/2012/3/29/101
It might be in a unrelated routine.
Since this code hasn't changed in a long time, it should be possible to bisect problem.
Dave
--
John David Anglin dave.anglin@xxxxxxxx
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