======================================================
WARNING: possible circular locking dependency detected
5.15.179-syzkaller #0 Not tainted
------------------------------------------------------
syz.1.32/4341 is trying to acquire lock:
ffff888024e95db8 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
but task is already holding lock:
ffff8880b8f2a218 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
ffff8880b8f2a218 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x662/0xcf0 kernel/time/hrtimer.c:1752
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #2 (hrtimer_bases.lock){-.-.}-{2:2}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
lock_hrtimer_base kernel/time/hrtimer.c:173 [inline]
hrtimer_start_range_ns+0x105/0xc80 kernel/time/hrtimer.c:1299
hrtimer_start include/linux/hrtimer.h:420 [inline]
run_page_cache_worker kernel/rcu/tree.c:3488 [inline]
kvfree_call_rcu+0x6a0/0x8a0 kernel/rcu/tree.c:3599
rtnl_register_internal+0x443/0x530 net/core/rtnetlink.c:223
rtnl_register+0x32/0x70 net/core/rtnetlink.c:273
ip_rt_init+0x2e6/0x3a0 net/ipv4/route.c:3791
ip_init+0xa/0x20 net/ipv4/ip_output.c:1749
inet_init+0x27c/0x390 net/ipv4/af_inet.c:2007
do_one_initcall+0x22b/0x7a0 init/main.c:1302
do_initcall_level+0x157/0x210 init/main.c:1375
do_initcalls+0x49/0x90 init/main.c:1391
kernel_init_freeable+0x425/0x5c0 init/main.c:1615
kernel_init+0x19/0x290 init/main.c:1506
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
-> #1 (krc.lock){..-.}-{2:2}:
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
krc_this_cpu_lock kernel/rcu/tree.c:3199 [inline]
add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3506 [inline]
kvfree_call_rcu+0x1b5/0x8a0 kernel/rcu/tree.c:3597
trie_update_elem+0x8ad/0xca0 kernel/bpf/lpm_trie.c:396
bpf_map_update_value+0x5d7/0x6c0 kernel/bpf/syscall.c:221
generic_map_update_batch+0x54d/0x8b0 kernel/bpf/syscall.c:1421
bpf_map_do_batch+0x4d0/0x620 kernel/bpf/syscall.c:-1
__sys_bpf+0x55c/0x670 kernel/bpf/syscall.c:-1
__do_sys_bpf kernel/bpf/syscall.c:4752 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4750 [inline]
__x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4750
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
-> #0 (&trie->lock){-.-.}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_1c0c44170264bb34+0x3d/0xc6c
bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
bpf_trace_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1915
trace_hrtimer_start include/trace/events/timer.h:199 [inline]
debug_activate kernel/time/hrtimer.c:476 [inline]
enqueue_hrtimer+0x324/0x390 kernel/time/hrtimer.c:1084
__run_hrtimer kernel/time/hrtimer.c:1705 [inline]
__hrtimer_run_queues+0x6b6/0xcf0 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
rcu_read_lock include/linux/rcupdate.h:740 [inline]
is_bpf_text_address+0x31/0x260 kernel/bpf/core.c:725
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x94/0x100 kernel/extable.c:105
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x73a/0x8a0 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa3/0x140 net/core/skbuff.c:914
netlink_broadcast_filtered+0x11a4/0x12c0 net/netlink/af_netlink.c:1521
netlink_broadcast net/netlink/af_netlink.c:1543 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2532
__neigh_notify+0x18a/0x2e0 net/core/neighbour.c:3389
neigh_cleanup_and_release+0xa5/0x260 net/core/neighbour.c:101
neigh_del net/core/neighbour.c:197 [inline]
neigh_remove_one+0x4b1/0x5c0 net/core/neighbour.c:218
neigh_forced_gc net/core/neighbour.c:251 [inline]
neigh_alloc net/core/neighbour.c:429 [inline]
___neigh_create+0x45a/0x2220 net/core/neighbour.c:591
ip6_finish_output2+0x11c5/0x15a0 net/ipv6/ip6_output.c:127
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xb98/0x1520 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3959
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
inode_permission+0x1bd/0x450 fs/namei.c:-1
may_open+0x29e/0x400 fs/namei.c:3232
do_open fs/namei.c:3606 [inline]
path_openat+0x25a2/0x2f20 fs/namei.c:3742
do_filp_open+0x21c/0x460 fs/namei.c:3769
do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
other info that might help us debug this:
Chain exists of:
&trie->lock --> krc.lock --> hrtimer_bases.lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(hrtimer_bases.lock);
lock(krc.lock);
lock(hrtimer_bases.lock);
lock(&trie->lock);
*** DEADLOCK ***
8 locks held by syz.1.32/4341:
#0: ffffc90000dd0be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:45 [inline]
#0: ffffc90000dd0be0 ((&ndev->rs_timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x560 kernel/time/timer.c:1441
#1: ffffffff8cb1f4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#2: ffffffff8cb1f540 (rcu_read_lock_bh){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:312
#3: ffffffff8dd46bb0 (&tbl->lock){+.-.}-{2:2}, at: neigh_forced_gc net/core/neighbour.c:236 [inline]
#3: ffffffff8dd46bb0 (&tbl->lock){+.-.}-{2:2}, at: neigh_alloc net/core/neighbour.c:429 [inline]
#3: ffffffff8dd46bb0 (&tbl->lock){+.-.}-{2:2}, at: ___neigh_create+0x202/0x2220 net/core/neighbour.c:591
#4: ffffffff8cb1f4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:312
#5: ffffffff8cb1f4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
#6: ffff8880b8f2a218 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1692 [inline]
#6: ffff8880b8f2a218 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x662/0xcf0 kernel/time/hrtimer.c:1752
#7: ffffffff8cb1f4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:311
stack backtrace:
CPU: 1 PID: 4341 Comm: syz.1.32 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133
check_prev_add kernel/locking/lockdep.c:3053 [inline]
check_prevs_add kernel/locking/lockdep.c:3172 [inline]
validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788
__lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012
lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
trie_delete_elem+0x90/0x690 kernel/bpf/lpm_trie.c:467
bpf_prog_1c0c44170264bb34+0x3d/0xc6c
bpf_dispatcher_nop_func include/linux/bpf.h:790 [inline]
__bpf_prog_run include/linux/filter.h:628 [inline]
bpf_prog_run include/linux/filter.h:635 [inline]
__bpf_trace_run kernel/trace/bpf_trace.c:1878 [inline]
bpf_trace_run2+0x19e/0x340 kernel/trace/bpf_trace.c:1915
trace_hrtimer_start include/trace/events/timer.h:199 [inline]
debug_activate kernel/time/hrtimer.c:476 [inline]
enqueue_hrtimer+0x324/0x390 kernel/time/hrtimer.c:1084
__run_hrtimer kernel/time/hrtimer.c:1705 [inline]
__hrtimer_run_queues+0x6b6/0xcf0 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
__sysvec_apic_timer_interrupt+0x13b/0x4b0 arch/x86/kernel/apic/apic.c:1114
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0x4d/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:rcu_read_lock include/linux/rcupdate.h:740 [inline]
RIP: 0010:is_bpf_text_address+0x31/0x260 kernel/bpf/core.c:725
Code: 41 54 53 50 49 89 fe e8 4d 56 f3 ff e8 98 b8 de ff e8 c3 c0 00 00 e8 6e be b2 08 89 c3 31 ff 89 c6 e8 93 59 f3 ff 85 db 74 10 aa 06 de ff 84 c0 74 0e e8 21 56 f3 ff eb 56 e8 1a 56 f3 ff eb
RSP: 0018:ffffc90000dcfee0 EFLAGS: 00000202
RAX: 0000000000000100 RBX: 0000000000000001 RCX: ffff88802c41d940
RDX: ffff88802c41d940 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000006d01 R08: ffffffff818d468d R09: fffffbfff2131e19
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802c41d940
R13: ffffffff816e2db0 R14: 00007fb783fb6169 R15: 1ffff920001b9ff5
kernel_text_address kernel/extable.c:151 [inline]
__kernel_text_address+0x94/0x100 kernel/extable.c:105
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf3/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x73a/0x8a0 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa3/0x140 net/core/skbuff.c:914
netlink_broadcast_filtered+0x11a4/0x12c0 net/netlink/af_netlink.c:1521
netlink_broadcast net/netlink/af_netlink.c:1543 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2532
__neigh_notify+0x18a/0x2e0 net/core/neighbour.c:3389
neigh_cleanup_and_release+0xa5/0x260 net/core/neighbour.c:101
neigh_del net/core/neighbour.c:197 [inline]
neigh_remove_one+0x4b1/0x5c0 net/core/neighbour.c:218
neigh_forced_gc net/core/neighbour.c:251 [inline]
neigh_alloc net/core/neighbour.c:429 [inline]
___neigh_create+0x45a/0x2220 net/core/neighbour.c:591
ip6_finish_output2+0x11c5/0x15a0 net/ipv6/ip6_output.c:127
dst_output include/net/dst.h:452 [inline]
NF_HOOK include/linux/netfilter.h:302 [inline]
ndisc_send_skb+0xb98/0x1520 net/ipv6/ndisc.c:513
addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3959
call_timer_fn+0x16d/0x560 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x67c/0x890 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x157/0x240 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:do_inode_permission fs/namei.c:458 [inline]
RIP: 0010:inode_permission+0x1bd/0x450 fs/namei.c:526
Code: e5 08 0f 85 45 01 00 00 4c 89 e7 4c 89 f6 e8 aa 02 00 00 84 c0 0f 84 41 01 00 00 e8 8d 25 a8 ff bb f3 ff ff ff e9 f9 fe ff ff <48> 8d 4d 20 48 89 c8 48 c1 e8 03 4d 89 f7 42 80 3c 30 00 74 11 48
RSP: 0018:ffffc9000317f890 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 1ffff1100be3c1b3 RCX: 0000000000080000
RDX: ffff88802c41d940 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88805f1e0d98 R08: ffffffff81d875fd R09: ffffffff81da590d
R10: 0000000000000007 R11: ffff88802c41d940 R12: ffff88805f1e0d9a
R13: ffffffff8c9ccda0 R14: dffffc0000000000 R15: 0000000000000000
may_open+0x29e/0x400 fs/namei.c:3232
do_open fs/namei.c:3606 [inline]
path_openat+0x25a2/0x2f20 fs/namei.c:3742
do_filp_open+0x21c/0x460 fs/namei.c:3769
do_sys_openat2+0x13b/0x4f0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1280
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fb783fb6169
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:00007fb781e1f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fb7841cefa0 RCX: 00007fb783fb6169
RDX: 00000000000026e1 RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007fb7840372a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000003a0ffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fb7841cefa0 R15: 00007ffce900fed8
----------------
Code disassembly (best guess):
0: 41 54 push %r12
2: 53 push %rbx
3: 50 push %rax
4: 49 89 fe mov %rdi,%r14
7: e8 4d 56 f3 ff call 0xfff35659
c: e8 98 b8 de ff call 0xffdeb8a9
11: e8 c3 c0 00 00 call 0xc0d9
16: e8 6e be b2 08 call 0x8b2be89
1b: 89 c3 mov %eax,%ebx
1d: 31 ff xor %edi,%edi
1f: 89 c6 mov %eax,%esi
21: e8 93 59 f3 ff call 0xfff359b9
26: 85 db test %ebx,%ebx
28: 74 10 je 0x3a
* 2a: e8 aa 06 de ff call 0xffde06d9 <-- trapping instruction
2f: 84 c0 test %al,%al
31: 74 0e je 0x41
33: e8 21 56 f3 ff call 0xfff35659
38: eb 56 jmp 0x90
3a: e8 1a 56 f3 ff call 0xfff35659
3f: eb .byte 0xeb