============================= 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.4.1410/12700: #0: ffffffff8e7e8618 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:317 [inline] #0: ffffffff8e7e8618 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:100 [inline] #0: ffffffff8e7e8618 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: bpf_prog_test_run_syscall+0x301/0xad0 net/bpf/test_run.c:1639 stack backtrace: CPU: 0 UID: 0 PID: 12700 Comm: syz.4.1410 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 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+0x2d6/0x9c0 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:1661 [inline] bpf_get_stack_raw_tp+0x1dd/0x280 kernel/trace/bpf_trace.c:1651 bpf_prog_aa1f08ea8b241262+0x46/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1402 [inline] __bpf_prog_run include/linux/filter.h:723 [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+0x4b1/0xad0 net/bpf/test_run.c:1640 bpf_prog_test_run kernel/bpf/syscall.c:4722 [inline] __sys_bpf+0x1725/0x4b90 kernel/bpf/syscall.c:6246 __do_sys_bpf kernel/bpf/syscall.c:6341 [inline] __se_sys_bpf kernel/bpf/syscall.c:6339 [inline] __x64_sys_bpf+0x7b/0xc0 kernel/bpf/syscall.c:6339 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f626959c629 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:00007f626a3c3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f6269815fa0 RCX: 00007f626959c629 RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a RBP: 00007f6269632b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6269816038 R14: 00007f6269815fa0 R15: 00007ffcec60ac98