======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc2-syzkaller-00751-gdedf56d775c0 #0 Not tainted
------------------------------------------------------
kworker/0:3/5111 is trying to acquire lock:
ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: krc_this_cpu_lock kernel/rcu/tree.c:3298 [inline]
ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3697 [inline]
ffff8880b9429430 (krc.lock){..-.}-{2:2}, at: kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3782

but task is already holding lock:
ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 kernel/time/timer.c:1164

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&base->lock){-.-.}-{2:2}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       lock_timer_base+0x112/0x240 kernel/time/timer.c:1051
       __mod_timer+0x1ca/0xeb0 kernel/time/timer.c:1132
       queue_delayed_work_on+0x1ca/0x390 kernel/workqueue.c:2572
       kvfree_call_rcu+0x47f/0x790 kernel/rcu/tree.c:3810
       rtnl_register_internal+0x482/0x590 net/core/rtnetlink.c:265
       rtnl_register+0x36/0x80 net/core/rtnetlink.c:315
       ip_rt_init+0x2bd/0x360 net/ipv4/route.c:3694
       ip_init+0xe/0x20 net/ipv4/ip_output.c:1667
       inet_init+0x3d8/0x580 net/ipv4/af_inet.c:1983
       do_one_initcall+0x248/0x880 init/main.c:1267
       do_initcall_level+0x157/0x210 init/main.c:1329
       do_initcalls+0x3f/0x80 init/main.c:1345
       kernel_init_freeable+0x435/0x5d0 init/main.c:1578
       kernel_init+0x1d/0x2b0 init/main.c:1467
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

-> #0 (krc.lock){..-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
       __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
       _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
       krc_this_cpu_lock kernel/rcu/tree.c:3298 [inline]
       add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3697 [inline]
       kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3782
       trie_delete_elem+0x546/0x6a0 kernel/bpf/lpm_trie.c:540
       bpf_prog_7dc2717de7fcbdae+0x45/0x49
       bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
       __bpf_prog_run include/linux/filter.h:691 [inline]
       bpf_prog_run include/linux/filter.h:698 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
       bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2447
       __traceiter_timer_start+0x75/0xc0 include/trace/events/timer.h:52
       trace_timer_start include/trace/events/timer.h:52 [inline]
       enqueue_timer+0x3ce/0x570 kernel/time/timer.c:663
       __mod_timer+0x953/0xeb0 kernel/time/timer.c:1181
       mod_peer_timer+0x189/0x260 drivers/net/wireguard/timers.c:37
       wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
       wg_packet_rx_poll+0xe08/0x2240 drivers/net/wireguard/receive.c:474
       __napi_poll+0xcb/0x490 net/core/dev.c:6722
       napi_poll net/core/dev.c:6791 [inline]
       net_rx_action+0x7bb/0x10a0 net/core/dev.c:6907
       handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
       do_softirq+0x11b/0x1e0 kernel/softirq.c:455
       __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
       spin_unlock_bh include/linux/spinlock.h:396 [inline]
       ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
       wg_packet_decrypt_worker+0xcde/0xd80 drivers/net/wireguard/receive.c:499
       process_one_work kernel/workqueue.c:3231 [inline]
       process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
       worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
       kthread+0x2f0/0x390 kernel/kthread.c:389
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&base->lock);
                               lock(krc.lock);
                               lock(&base->lock);
  lock(krc.lock);

 *** DEADLOCK ***

5 locks held by kworker/0:3/5111:
 #0: ffff888064af2548 ((wq_completion)wg-crypt-wg2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3206 [inline]
 #0: ffff888064af2548 ((wq_completion)wg-crypt-wg2){+.+.}-{0:0}, at: process_scheduled_works+0x90a/0x1830 kernel/workqueue.c:3312
 #1: ffffc90003fafd00 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((typeof(*((worker))) *)((worker))); (typeof((typeof(*((worker))) *)((worker)))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3207 [inline]
 #1: ffffc90003fafd00 ((work_completion)(&({ do { const void *__vpp_verify = (typeof((worker) + 0))((void *)0); (void)__vpp_verify; } while (0); ({ unsigned long __ptr; __ptr = (unsigned long) ((typeof(*((worker))) *)((worker))); (typeof((typeof(*((worker))) *)((worker)))) (__ptr + (((__per_cpu_offset[(cpu)])))); }); })->work)){+.+.}-{0:0}, at: process_scheduled_works+0x945/0x1830 kernel/workqueue.c:3312
 #2: ffffffff8e334000 (rcu_read_lock_bh){....}-{1:2}, at: local_bh_disable include/linux/bottom_half.h:20 [inline]
 #2: ffffffff8e334000 (rcu_read_lock_bh){....}-{1:2}, at: rcu_read_lock_bh include/linux/rcupdate.h:833 [inline]
 #2: ffffffff8e334000 (rcu_read_lock_bh){....}-{1:2}, at: mod_peer_timer+0x21/0x260 drivers/net/wireguard/timers.c:34
 #3: ffff8880b942a718 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x744/0xeb0 kernel/time/timer.c:1164
 #4: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #4: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #4: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2405 [inline]
 #4: ffffffff8e333fa0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x1fc/0x540 kernel/trace/bpf_trace.c:2447

stack backtrace:
CPU: 0 PID: 5111 Comm: kworker/0:3 Not tainted 6.10.0-rc2-syzkaller-00751-gdedf56d775c0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: wg-crypt-wg2 wg_packet_decrypt_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline]
 _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154
 krc_this_cpu_lock kernel/rcu/tree.c:3298 [inline]
 add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3697 [inline]
 kvfree_call_rcu+0x18a/0x790 kernel/rcu/tree.c:3782
 trie_delete_elem+0x546/0x6a0 kernel/bpf/lpm_trie.c:540
 bpf_prog_7dc2717de7fcbdae+0x45/0x49
 bpf_dispatcher_nop_func include/linux/bpf.h:1243 [inline]
 __bpf_prog_run include/linux/filter.h:691 [inline]
 bpf_prog_run include/linux/filter.h:698 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2406 [inline]
 bpf_trace_run2+0x2ec/0x540 kernel/trace/bpf_trace.c:2447
 __traceiter_timer_start+0x75/0xc0 include/trace/events/timer.h:52
 trace_timer_start include/trace/events/timer.h:52 [inline]
 enqueue_timer+0x3ce/0x570 kernel/time/timer.c:663
 __mod_timer+0x953/0xeb0 kernel/time/timer.c:1181
 mod_peer_timer+0x189/0x260 drivers/net/wireguard/timers.c:37
 wg_packet_consume_data_done drivers/net/wireguard/receive.c:354 [inline]
 wg_packet_rx_poll+0xe08/0x2240 drivers/net/wireguard/receive.c:474
 __napi_poll+0xcb/0x490 net/core/dev.c:6722
 napi_poll net/core/dev.c:6791 [inline]
 net_rx_action+0x7bb/0x10a0 net/core/dev.c:6907
 handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
 do_softirq+0x11b/0x1e0 kernel/softirq.c:455
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 ptr_ring_consume_bh include/linux/ptr_ring.h:367 [inline]
 wg_packet_decrypt_worker+0xcde/0xd80 drivers/net/wireguard/receive.c:499
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>