============================= WARNING: suspicious RCU usage 6.15.0-rc4-syzkaller-gf263336a41da #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.2.355/7185: #0: ffffffff8df3ba40 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3ba40 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 include/linux/rcupdate_trace.h:58 stack backtrace: CPU: 1 UID: 0 PID: 7185 Comm: syz.2.355 Not tainted 6.15.0-rc4-syzkaller-gf263336a41da #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x140/0x1d0 kernel/locking/lockdep.c:6865 get_callchain_entry+0x2b6/0x3c0 kernel/events/callchain.c:163 get_perf_callchain+0xa1/0x6b0 kernel/events/callchain.c:227 __bpf_get_stack+0x3fc/0xa60 kernel/bpf/stackmap.c:454 ____bpf_get_stack kernel/bpf/stackmap.c:499 [inline] bpf_get_stack+0x33/0x50 kernel/bpf/stackmap.c:496 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1869 [inline] bpf_get_stack_raw_tp+0x195/0x220 kernel/trace/bpf_trace.c:1859 bpf_prog_d43750871481577d+0x46/0x4a bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] bpf_prog_run_pin_on_cpu+0x67/0x150 include/linux/filter.h:742 bpf_prog_test_run_syscall+0x312/0x4b0 net/bpf/test_run.c:1564 bpf_prog_test_run+0x2a9/0x340 kernel/bpf/syscall.c:4428 __sys_bpf+0x4a4/0x860 kernel/bpf/syscall.c:5853 __do_sys_bpf kernel/bpf/syscall.c:5942 [inline] __se_sys_bpf kernel/bpf/syscall.c:5940 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5940 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f083758e969 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:00007f08383f8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f08377b6240 RCX: 00007f083758e969 RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a RBP: 00007f0837610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f08377b6240 R15: 00007fff694014d8