============================= WARNING: suspicious RCU usage 5.14.0-rc5-syzkaller #0 Not tainted ----------------------------- include/linux/cgroup.h:481 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor.2/13186: #0: ffffffff8b97b760 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:52 [inline] #0: ffffffff8b97b760 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x2b7/0x7a0 net/bpf/test_run.c:1049 stack backtrace: CPU: 1 PID: 13186 Comm: syz-executor.2 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 task_css_set include/linux/cgroup.h:481 [inline] task_dfl_cgroup include/linux/cgroup.h:550 [inline] ____bpf_get_current_cgroup_id kernel/bpf/helpers.c:366 [inline] bpf_get_current_cgroup_id+0x1ce/0x210 kernel/bpf/helpers.c:364 bpf_prog_08c4887f705f20b8+0x10/0x64 bpf_dispatcher_nop_func include/linux/bpf.h:717 [inline] __bpf_prog_run include/linux/filter.h:626 [inline] bpf_prog_run include/linux/filter.h:633 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:653 [inline] bpf_prog_test_run_syscall+0x337/0x7a0 net/bpf/test_run.c:1050 bpf_prog_test_run kernel/bpf/syscall.c:3307 [inline] __sys_bpf+0x2137/0x5df0 kernel/bpf/syscall.c:4605 __do_sys_bpf kernel/bpf/syscall.c:4691 [inline] __se_sys_bpf kernel/bpf/syscall.c:4689 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4689 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f16cc918188 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000048 RSI: 0000000020000500 RDI: 000000000000000a RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe117842ff R14: 00007f16cc918300 R15: 0000000000022000