syzbot

======================================================
WARNING: possible circular locking dependency detected
6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0 Not tainted
------------------------------------------------------
syz.4.5/5217 is trying to acquire lock:
ffffffff8ea56008 (pool_lock#2){-.-.}-{2:2}
, at: stack_depot_save_flags+0x240/0x830 lib/stackdepot.c:633

but task is already holding lock:
ffff8881490e41f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xc8/0xc00 kernel/bpf/lpm_trie.c:333

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&trie->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
       trie_delete_elem+0x96/0x6a0 kernel/bpf/lpm_trie.c:462
       0xffffffffa000085a
       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:2403 [inline]
       bpf_trace_run2+0x2ee/0x540 kernel/trace/bpf_trace.c:2444
       trace_contention_end+0x114/0x140 include/trace/events/lock.h:122
       __pv_queued_spin_lock_slowpath+0xb81/0xdc0 kernel/locking/qspinlock.c:557
       pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:584 [inline]
       queued_spin_lock_slowpath+0x42/0x50 arch/x86/include/asm/qspinlock.h:51
       queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
       do_raw_spin_lock+0x272/0x370 kernel/locking/spinlock_debug.c:116
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
       _raw_spin_lock_irqsave+0xe1/0x120 kernel/locking/spinlock.c:162
       stack_depot_save_flags+0x240/0x830 lib/stackdepot.c:633
       kasan_save_stack mm/kasan/common.c:48 [inline]
       kasan_save_track+0x51/0x80 mm/kasan/common.c:68
       poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
       __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
       kasan_kmalloc include/linux/kasan.h:211 [inline]
       kmalloc_trace_noprof+0x19c/0x2c0 mm/slub.c:4153
       kmalloc_noprof include/linux/slab.h:660 [inline]
       add_stack_record_to_list mm/page_owner.c:172 [inline]
       inc_stack_record_count mm/page_owner.c:214 [inline]
       __set_page_owner+0x55f/0x800 mm/page_owner.c:329
       set_page_owner include/linux/page_owner.h:32 [inline]
       post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
       prep_new_page mm/page_alloc.c:1476 [inline]
       get_page_from_freelist+0x2e43/0x2f00 mm/page_alloc.c:3420
       __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4678
       __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
       alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
       alloc_slab_page+0x5f/0x120 mm/slub.c:2265
       allocate_slab+0x5a/0x2f0 mm/slub.c:2428
       new_slab mm/slub.c:2481 [inline]
       ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667
       __slab_alloc+0x58/0xa0 mm/slub.c:3757
       __slab_alloc_node mm/slub.c:3810 [inline]
       slab_alloc_node mm/slub.c:3989 [inline]
       kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4008
       fill_pool lib/debugobjects.c:168 [inline]
       debug_objects_fill_pool+0x52b/0x9b0 lib/debugobjects.c:615
       __debug_object_init+0xa4/0x400 lib/debugobjects.c:627
       debug_timer_init kernel/time/timer.c:831 [inline]
       debug_init kernel/time/timer.c:879 [inline]
       init_timer_key+0x38/0x310 kernel/time/timer.c:923
       wiphy_delayed_work_init include/net/cfg80211.h:6041 [inline]
       ieee80211_sta_setup_sdata+0x213/0x730 net/mac80211/mlme.c:7505
       ieee80211_setup_sdata+0x823/0xb70 net/mac80211/iface.c:1766
       ieee80211_if_add+0x988/0x1770 net/mac80211/iface.c:2188
       ieee80211_register_hw+0x321c/0x3d80 net/mac80211/main.c:1581
       mac80211_hwsim_new_radio+0x2597/0x44c0 drivers/net/wireless/virtual/mac80211_hwsim.c:5470
       hwsim_new_radio_nl+0xe4c/0x21d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6151
       genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
       genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
       genl_rcv_msg+0xb16/0xec0 net/netlink/genetlink.c:1210
       netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2564
       genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
       netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
       netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1361
       netlink_sendmsg+0x8db/0xcb0 net/netlink/af_netlink.c:1905
       sock_sendmsg_nosec net/socket.c:730 [inline]
       __sock_sendmsg+0x223/0x270 net/socket.c:745
       __sys_sendto+0x3a4/0x4f0 net/socket.c:2192
       __do_sys_sendto net/socket.c:2204 [inline]
       __se_sys_sendto net/socket.c:2200 [inline]
       __x64_sys_sendto+0xde/0x100 net/socket.c:2200
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (pool_lock#2){-.-.}-{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_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       stack_depot_save_flags+0x240/0x830 lib/stackdepot.c:633
       kasan_save_stack mm/kasan/common.c:48 [inline]
       kasan_save_track+0x51/0x80 mm/kasan/common.c:68
       poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
       __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
       kasan_kmalloc include/linux/kasan.h:211 [inline]
       __do_kmalloc_node mm/slub.c:4122 [inline]
       __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4129
       kmalloc_node_noprof include/linux/slab.h:681 [inline]
       bpf_map_kmalloc_node+0xd3/0x1c0 kernel/bpf/syscall.c:422
       lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline]
       trie_update_elem+0x1cd/0xc00 kernel/bpf/lpm_trie.c:342
       bpf_map_update_value+0x4d5/0x540 kernel/bpf/syscall.c:203
       generic_map_update_batch+0x60d/0x900 kernel/bpf/syscall.c:1889
       bpf_map_do_batch+0x3e2/0x690 kernel/bpf/syscall.c:5197
       __sys_bpf+0x377/0x810
       __do_sys_bpf kernel/bpf/syscall.c:5795 [inline]
       __se_sys_bpf kernel/bpf/syscall.c:5793 [inline]
       __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5793
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&trie->lock);
                               lock(pool_lock#2);
                               lock(&trie->lock);
  lock(pool_lock#2);

 *** DEADLOCK ***

2 locks held by syz.4.5/5217:
 #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e333f60 (rcu_read_lock){....}-{1:2}, at: bpf_map_update_value+0x3c4/0x540 kernel/bpf/syscall.c:202
 #1: ffff8881490e41f8 (&trie->lock){....}-{2:2}, at: trie_update_elem+0xc8/0xc00 kernel/bpf/lpm_trie.c:333

stack backtrace:
CPU: 0 PID: 5217 Comm: syz.4.5 Not tainted 6.10.0-rc5-syzkaller-00021-g24ca36a562d6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
 <TASK>
 __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_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
 stack_depot_save_flags+0x240/0x830 lib/stackdepot.c:633
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_save_track+0x51/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4122 [inline]
 __kmalloc_node_noprof+0x22a/0x440 mm/slub.c:4129
 kmalloc_node_noprof include/linux/slab.h:681 [inline]
 bpf_map_kmalloc_node+0xd3/0x1c0 kernel/bpf/syscall.c:422
 lpm_trie_node_alloc kernel/bpf/lpm_trie.c:299 [inline]
 trie_update_elem+0x1cd/0xc00 kernel/bpf/lpm_trie.c:342
 bpf_map_update_value+0x4d5/0x540 kernel/bpf/syscall.c:203
 generic_map_update_batch+0x60d/0x900 kernel/bpf/syscall.c:1889
 bpf_map_do_batch+0x3e2/0x690 kernel/bpf/syscall.c:5197
 __sys_bpf+0x377/0x810
 __do_sys_bpf kernel/bpf/syscall.c:5795 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5793 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5793
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbc41775ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbc4247c048 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbc41903fa0 RCX: 00007fbc41775ae9
RDX: 0000000000000038 RSI: 0000000020000240 RDI: 000000000000001a
RBP: 00007fbc417f6756 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fbc41903fa0 R15: 00007ffdf3b37c38
 </TASK>