On Wed, Nov 14, 2018 at 6:01 PM Roman Gushchin <[email protected]> wrote: > > Naresh reported an issue with the non-atomic memory allocation of > cgroup local storage buffers: > > [ 73.047526] BUG: sleeping function called from invalid context at > /srv/oe/build/tmp-rpb-glibc/work-shared/intel-corei7-64/kernel-source/mm/slab.h:421 > [ 73.060915] in_atomic(): 1, irqs_disabled(): 0, pid: 3157, name: > test_cgroup_sto > [ 73.068342] INFO: lockdep is turned off. > [ 73.072293] CPU: 2 PID: 3157 Comm: test_cgroup_sto Not tainted > 4.20.0-rc2-next-20181113 #1 > [ 73.080548] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS > 2.0b 07/27/2017 > [ 73.088018] Call Trace: > [ 73.090463] dump_stack+0x70/0xa5 > [ 73.093783] ___might_sleep+0x152/0x240 > [ 73.097619] __might_sleep+0x4a/0x80 > [ 73.101191] __kmalloc_node+0x1cf/0x2f0 > [ 73.105031] ? cgroup_storage_update_elem+0x46/0x90 > [ 73.109909] cgroup_storage_update_elem+0x46/0x90 > > cgroup_storage_update_elem() (as well as other update map update > callbacks) is called with disabled preemption, so GFP_ATOMIC > allocation should be used: e.g. alloc_htab_elem() in hashtab.c. > > Reported-by: Naresh Kamboju <[email protected]> > Tested-by: Naresh Kamboju <[email protected]> > Signed-off-by: Roman Gushchin <[email protected]> > Cc: Alexei Starovoitov <[email protected]> > Cc: Daniel Borkmann <[email protected]>
Acked-by: Yonghong Song <[email protected]> > --- > kernel/bpf/local_storage.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-)
