============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- kernel/events/callchain.c:163 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.0.17/5992: #0: ffffffff8e1c1a20 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e1c1a20 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:58 [inline] #0: ffffffff8e1c1a20 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x357/0xae0 net/bpf/test_run.c:1572 stack backtrace: CPU: 1 UID: 0 PID: 5992 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x166/0x260 kernel/locking/lockdep.c:6876 get_callchain_entry+0x278/0x3f0 kernel/events/callchain.c:163 get_perf_callchain+0x2d6/0x810 kernel/events/callchain.c:231 __bpf_get_stack+0x4f4/0xa10 kernel/bpf/stackmap.c:454 ____bpf_get_stack kernel/bpf/stackmap.c:499 [inline] bpf_get_stack+0x32/0x40 kernel/bpf/stackmap.c:496 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1653 [inline] bpf_get_stack_raw_tp+0x1dd/0x280 kernel/trace/bpf_trace.c:1643 bpf_prog_e8e6327ccf46c9a7+0x46/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1350 [inline] __bpf_prog_run include/linux/filter.h:721 [inline] bpf_prog_run include/linux/filter.h:728 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:745 [inline] bpf_prog_test_run_syscall+0x461/0xae0 net/bpf/test_run.c:1573 bpf_prog_test_run kernel/bpf/syscall.c:4673 [inline] __sys_bpf+0x1032/0x4980 kernel/bpf/syscall.c:6152 __do_sys_bpf kernel/bpf/syscall.c:6244 [inline] __se_sys_bpf kernel/bpf/syscall.c:6242 [inline] __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:6242 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4167f8eec9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd9e91d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f41681e5fa0 RCX: 00007f4167f8eec9 RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a RBP: 00007f4168011f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f41681e5fa0 R14: 00007f41681e5fa0 R15: 0000000000000003