syzbot

=============================
WARNING: suspicious RCU usage
6.1.90-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-executor244/3545:
 #0: ffffffff8d12b540 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d12b540 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x37/0x70 include/linux/rcupdate_trace.h:57

stack backtrace:
CPU: 0 PID: 3545 Comm: syz-executor244 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 lockdep_rcu_suspicious+0x21c/0x330 kernel/locking/lockdep.c:6592
 get_callchain_entry+0x2ac/0x3c0 kernel/events/callchain.c:161
 get_perf_callchain+0xe6/0x810 kernel/events/callchain.c:187
 __bpf_get_stack+0x378/0x570 kernel/bpf/stackmap.c:438
 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1877 [inline]
 bpf_get_stack_raw_tp+0x1b2/0x220 kernel/trace/bpf_trace.c:1867
 bpf_prog_d43750871481577d+0x3d/0x41
 bpf_dispatcher_nop_func include/linux/bpf.h:989 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 bpf_prog_run_pin_on_cpu+0x62/0x130 include/linux/filter.h:627
 bpf_prog_test_run_syscall+0x312/0x4d0 net/bpf/test_run.c:1629
 bpf_prog_test_run+0x32f/0x3a0 kernel/bpf/syscall.c:3670
 __sys_bpf+0x3eb/0x6c0 kernel/bpf/syscall.c:5023
 __do_sys_bpf kernel/bpf/syscall.c:5109 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5107 [inline]
 __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5107
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fd95568b669
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc745f4ef8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007ffc745f50c8 RCX: 00007fd95568b669
RDX: 000000000000000c RSI: 00000000200004c0 RDI: 000000000000000a
RBP: 00007fd9556fe610 R08: 00007ffc745f50c8 R09: 00007ffc745f50c8