============================= WARNING: suspicious RCU usage syzkaller #0 Tainted: G L ----------------------------- 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.1.1856/14732: #0: ffffffff8dfc3238 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline] #0: ffffffff8dfc3238 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_tasks_trace include/linux/rcupdate_trace.h:59 [inline] #0: ffffffff8dfc3238 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: __bpf_prog_test_run_raw_tp+0x1ba/0xa20 net/bpf/test_run.c:756 stack backtrace: CPU: 0 UID: 0 PID: 14732 Comm: syz.1.1856 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x13f/0x1d0 kernel/locking/lockdep.c:6878 get_callchain_entry+0x2b6/0x3c0 kernel/events/callchain.c:163 get_perf_callchain+0xd5/0x880 kernel/events/callchain.c:231 __bpf_get_stack+0x3e9/0xa70 kernel/bpf/stackmap.c:730 ____bpf_get_stack kernel/bpf/stackmap.c:775 [inline] bpf_get_stack+0x33/0x50 kernel/bpf/stackmap.c:772 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1692 [inline] bpf_get_stack_raw_tp+0x1a4/0x210 kernel/trace/bpf_trace.c:1682 bpf_prog_e8e6327ccf46c9a7+0x46/0x4e bpf_dispatcher_nop_func include/linux/bpf.h:1454 [inline] __bpf_prog_run include/linux/filter.h:723 [inline] bpf_prog_run include/linux/filter.h:730 [inline] __bpf_prog_test_run_raw_tp+0x329/0xa20 net/bpf/test_run.c:767 bpf_prog_test_run_raw_tp+0x562/0x7e0 net/bpf/test_run.c:824 bpf_prog_test_run+0x2cb/0x340 kernel/bpf/syscall.c:4859 __sys_bpf+0xa22/0xd90 kernel/bpf/syscall.c:6436 __do_sys_bpf kernel/bpf/syscall.c:6537 [inline] __se_sys_bpf kernel/bpf/syscall.c:6534 [inline] __x64_sys_bpf+0xba/0xd0 kernel/bpf/syscall.c:6534 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4f4aa7ce59 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:00007f4f48cce028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f4f4acf5fa0 RCX: 00007f4f4aa7ce59 RDX: 0000000000000050 RSI: 00002000000006c0 RDI: 000000000000000a RBP: 00007f4f4ab12e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f4f4acf6038 R14: 00007f4f4acf5fa0 R15: 00007fffeea97c08