============================= 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.6.1868/12317: #0: ffffffff8e5e2940 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e5e2940 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:58 [inline] #0: ffffffff8e5e2940 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x33e/0xad0 net/bpf/test_run.c:1638 stack backtrace: CPU: 1 UID: 0 PID: 12317 Comm: syz.6.1868 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 lockdep_rcu_suspicious.cold+0x4f/0xb1 kernel/locking/lockdep.c:6876 get_callchain_entry+0x278/0x3f0 kernel/events/callchain.c:163 get_perf_callchain+0x2d6/0x990 kernel/events/callchain.c:231 __bpf_get_stack+0x531/0xa90 kernel/bpf/stackmap.c:472 ____bpf_get_stack kernel/bpf/stackmap.c:517 [inline] bpf_get_stack+0x32/0x40 kernel/bpf/stackmap.c:514 ____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:1378 [inline] __bpf_prog_run include/linux/filter.h:712 [inline] bpf_prog_run include/linux/filter.h:730 [inline] bpf_prog_run_pin_on_cpu include/linux/filter.h:747 [inline] bpf_prog_test_run_syscall+0x6b7/0xad0 net/bpf/test_run.c:1639 bpf_prog_test_run kernel/bpf/syscall.c:4703 [inline] __sys_bpf+0x1e56/0x5050 kernel/bpf/syscall.c:6182 __do_sys_bpf kernel/bpf/syscall.c:6274 [inline] __se_sys_bpf kernel/bpf/syscall.c:6272 [inline] __x64_sys_bpf+0x7b/0xc0 kernel/bpf/syscall.c:6272 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc30bd9aeb9 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:00007fc309fb4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007fc30c016180 RCX: 00007fc30bd9aeb9 RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a RBP: 00007fc30be08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc30c016218 R14: 00007fc30c016180 R15: 00007ffe8ee963b8