audit: type=1400 audit(1516689777.419:7): avc:  denied  { map } for  pid=3660 comm="syzkaller638461" path="/root/syzkaller638461992" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1

=============================
WARNING: suspicious RCU usage
4.15.0-rc8+ #1 Not tainted
-----------------------------
./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syzkaller638461/3661:
 #0:  (rcu_read_lock){....}, at: [<0000000017715d7f>] map_get_next_key kernel/bpf/syscall.c:836 [inline]
 #0:  (rcu_read_lock){....}, at: [<0000000017715d7f>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 #0:  (rcu_read_lock){....}, at: [<0000000017715d7f>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846

stack backtrace:
CPU: 1 PID: 3661 Comm: syzkaller638461 Not tainted 4.15.0-rc8+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x257 lib/dump_stack.c:53
 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4585
 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline]
 ___might_sleep+0x385/0x470 kernel/sched/core.c:6025
 __might_sleep+0x95/0x190 kernel/sched/core.c:6013
 slab_pre_alloc_hook mm/slab.h:419 [inline]
 slab_alloc mm/slab.c:3368 [inline]
 __do_kmalloc mm/slab.c:3706 [inline]
 __kmalloc+0x2c5/0x760 mm/slab.c:3717
 kmalloc include/linux/slab.h:504 [inline]
 trie_get_next_key+0x517/0xf10 kernel/bpf/lpm_trie.c:626
 map_get_next_key kernel/bpf/syscall.c:842 [inline]
 SYSC_bpf kernel/bpf/syscall.c:1881 [inline]
 SyS_bpf+0x11b4/0x4860 kernel/bpf/syscall.c:1846
 ? lock_release+