============================= WARNING: suspicious RCU usage syzkaller #0 Not tainted ----------------------------- kernel/events/callchain.c:161 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.0.8455/32058: #0: ffffffff8cb2d7a0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2d7a0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x37/0x70 include/linux/rcupdate_trace.h:57 stack backtrace: CPU: 0 PID: 32058 Comm: syz.0.8455 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lockdep_rcu_suspicious+0x1dd/0x300 kernel/locking/lockdep.c:6611 get_callchain_entry+0x2a5/0x3b0 kernel/events/callchain.c:161 get_perf_callchain+0xc4/0x490 kernel/events/callchain.c:191 __bpf_get_stack+0x2de/0x520 kernel/bpf/stackmap.c:438 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1880 [inline] bpf_get_stack_raw_tp+0x189/0x1c0 kernel/trace/bpf_trace.c:1870 bpf_prog_14d9fb3786f83342+0x3d/0x41 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:607 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_prog_run_pin_on_cpu+0x64/0x150 include/linux/filter.h:631 bpf_prog_test_run_syscall+0x313/0x4a0 net/bpf/test_run.c:1650 bpf_prog_test_run+0x31e/0x390 kernel/bpf/syscall.c:3695 __sys_bpf+0x62b/0x780 kernel/bpf/syscall.c:5048 __do_sys_bpf kernel/bpf/syscall.c:5134 [inline] __se_sys_bpf kernel/bpf/syscall.c:5132 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5132 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f47dad9aeb9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f47dbc66028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f47db015fa0 RCX: 00007f47dad9aeb9 RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a RBP: 00007f47dae08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f47db016038 R14: 00007f47db015fa0 R15: 00007ffc46f17358