============================= WARNING: suspicious RCU usage BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 0, pid: 6813, name: syz-executor7 1 lock held by syz-executor7/6813: #0: (rcu_read_lock){....}, at: [<000000001587b614>] map_get_next_key kernel/bpf/syscall.c:836 [inline] #0: (rcu_read_lock){....}, at: [<000000001587b614>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline] #0: (rcu_read_lock){....}, at: [<000000001587b614>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846 CPU: 0 PID: 6813 Comm: syz-executor7 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 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6060 __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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452ef9 RSP: 002b:00007f68c270dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ef9 RDX: 0000000000000018 RSI: 0000000020013fe8 RDI: 0000000000000004 RBP: 0000000000000040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006ef6a0 R13: 00000000ffffffff R14: 00007f68c270e6d4 R15: 0000000000000000 4.15.0-rc8+ #1 Tainted: G W ----------------------------- ./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 syz-executor4/6811: #0: (rcu_read_lock){....}, at: [<000000001587b614>] map_get_next_key kernel/bpf/syscall.c:836 [inline] #0: (rcu_read_lock){....}, at: [<000000001587b614>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline] #0: (rcu_read_lock){....}, at: [<000000001587b614>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846 stack backtrace: CPU: 1 PID: 6811 Comm: syz-executor4 Tainted: G W 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452ef9 RSP: 002b:00007f0ae32edc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f0ae32ee700 RCX: 0000000000452ef9 RDX: 0000000000000018 RSI: 0000000020013fe8 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 00007ffe44e8553f R14: 00007f0ae32ee9c0 R15: 0000000000000000 overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' 9pnet_virtio: no channels available for device ./file0 proc: unrecognized mount option " " or missing value proc: unrecognized mount option " " or missing value audit: type=1400 audit(1516689101.460:20): avc: denied { setopt } for pid=7649 comm="syz-executor1" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:unlabeled_t:s0 tclass=socket permissive=1 audit: type=1400 audit(1516689101.493:21): avc: denied { ioctl } for pid=7649 comm="syz-executor1" path="socket:[19402]" dev="sockfs" ino=19402 ioctlcmd=0x89e2 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=sock_file permissive=1 overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: devpts: called with bogus options devpts: called with bogus options hrtimer: interrupt took 36277 ns overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' tmpfs: Bad mount option õ'0œ‚ª?CDyì(bDë¦(gå´º tmpfs: Bad mount option õ'0œ‚ª?CDyì(bDë¦(gå´º