syzbot

=============================
WARNING: suspicious RCU usage
6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #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-executor305/5180:
 #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:57 [inline]
 #0: ffffffff8d7b04c0 (rcu_read_lock_trace){....}-{0:0}, at: bpf_prog_test_run_syscall+0x345/0x770 net/bpf/test_run.c:1508

stack backtrace:
CPU: 3 PID: 5180 Comm: syz-executor305 Not tainted 6.9.0-rc5-syzkaller-00159-gc942a0cd3603 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:114
 lockdep_rcu_suspicious+0x20b/0x3b0 kernel/locking/lockdep.c:6712
 get_callchain_entry+0x274/0x3f0 kernel/events/callchain.c:161
 get_perf_callchain+0xdc/0x5a0 kernel/events/callchain.c:187
 __bpf_get_stack+0x4d9/0x700 kernel/bpf/stackmap.c:435
 ____bpf_get_stack_raw_tp kernel/trace/bpf_trace.c:1985 [inline]
 bpf_get_stack_raw_tp+0x124/0x160 kernel/trace/bpf_trace.c:1975
 ___bpf_prog_run+0x3e51/0xabd0 kernel/bpf/core.c:1997
 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 bpf_prog_run_pin_on_cpu include/linux/filter.h:681 [inline]
 bpf_prog_test_run_syscall+0x3ae/0x770 net/bpf/test_run.c:1509
 bpf_prog_test_run kernel/bpf/syscall.c:4269 [inline]
 __sys_bpf+0xd56/0x4b40 kernel/bpf/syscall.c:5678
 __do_sys_bpf kernel/bpf/syscall.c:5767 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5765 [inline]
 __x64_sys_bpf+0x78/0xc0 kernel/bpf/syscall.c:5765
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f54610dc669
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:00007fff4b9fae08 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fff4b9fafd8 RCX: 00007f54610dc669
RDX: 000000000000000c RSI: 00000000200004c0 RDI: 000000000000000a
RBP: 00007f546114f610 R08: 00007fff4b9fafd8 R09: 00007fff4b9fafd8
R10: 00007fff4b9fafd8 R11: 0000000000000246 R12: 0000000000000001
R13: 00007fff4b9fafc8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>