============================= 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 syz-executor7/4233: #0: (rcu_read_lock){....}, at: [<000000002856e47d>] map_get_next_key kernel/bpf/syscall.c:836 [inline] #0: (rcu_read_lock){....}, at: [<000000002856e47d>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline] #0: (rcu_read_lock){....}, at: [<000000002856e47d>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846 stack backtrace: CPU: 0 PID: 4233 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 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:00007fb3d4fbec58 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: 00007fb3d4fbf6d4 R15: 0000000000000000 BUG: sleeping function called from invalid context at mm/slab.h:419 in_atomic(): 1, irqs_disabled(): 0, pid: 4233, name: syz-executor7 1 lock held by syz-executor7/4233: #0: (rcu_read_lock){....}, at: [<000000002856e47d>] map_get_next_key kernel/bpf/syscall.c:836 [inline] #0: (rcu_read_lock){....}, at: [<000000002856e47d>] SYSC_bpf kernel/bpf/syscall.c:1881 [inline] #0: (rcu_read_lock){....}, at: [<000000002856e47d>] SyS_bpf+0x1105/0x4860 kernel/bpf/syscall.c:1846 CPU: 0 PID: 4233 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:00007fb3d4fbec58 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: 00007fb3d4fbf6d4 R15: 0000000000000000 overlayfs: unrecognized mount option "zwjj^tB 'z7+ϠJnwF^!FXŋ" or missing value audit: type=1400 audit(1516661038.109:17): avc: denied { map } for pid=4262 comm="syz-executor6" path="socket:[15464]" dev="sockfs" ino=15464 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=socket permissive=1 audit: type=1400 audit(1516661039.169:18): avc: denied { associate } for pid=4533 comm="syz-executor2" name="file0" scontext=unconfined_u:object_r:unlabeled_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=filesystem permissive=1 overlayfs: unrecognized mount option "@c*O>`!dր8" or missing value overlayfs: unrecognized mount option "@c*O>`!dր8" or missing value audit: type=1400 audit(1516661039.281:19): avc: denied { create } for pid=4571 comm="syz-executor0" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_iscsi_socket permissive=1 can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. overlayfs: unrecognized mount option "E`-YES8Q m8EX V[ogPUSNC cdwk"CDV5óGKE= fXNKK{ [#\" or missing value overlayfs: unrecognized mount option "E`-YES8Q m8EX V[ogPUSNC cdwk"CDV5óGKE= fXNKK{ [#\" or missing value can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. can: request_module (can-proto-4) failed. can: request_module (can-proto-4) failed. can: request_module (can-proto-0) failed.