======================================================
WARNING: possible circular locking dependency detected
6.9.0-syzkaller-05151-g1b294a1f3561 #0 Not tainted
------------------------------------------------------
syz-executor.1/8795 is trying to acquire lock:
ffff88802e1b6bf0 (clock-AF_INET6){++--}-{2:2}, at: sock_map_del_link net/core/sock_map.c:175 [inline]
ffff88802e1b6bf0 (clock-AF_INET6){++--}-{2:2}, at: sock_map_unref+0x442/0x5e0 net/core/sock_map.c:192
but task is already holding lock:
ffff8880231b86e0 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
ffff8880231b86e0 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&htab->buckets[i].lock){+.-.}-{2:2}:
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline]
_raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178
spin_lock_bh include/linux/spinlock.h:356 [inline]
sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957
0xffffffffa000069a
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_run4+0x334/0x590 kernel/trace/bpf_trace.c:2446
trace_mm_page_alloc include/trace/events/kmem.h:177 [inline]
__alloc_pages+0x694/0x6c0 mm/page_alloc.c:4597
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x5f/0x160 mm/slub.c:2190
allocate_slab mm/slub.c:2353 [inline]
new_slab+0x84/0x2f0 mm/slub.c:2406
___slab_alloc+0xb07/0x12e0 mm/slub.c:3592
__slab_alloc mm/slub.c:3682 [inline]
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
kmem_cache_alloc+0x252/0x350 mm/slub.c:3925
rds_tcp_data_recv+0x15a/0xa10 net/rds/tcp_recv.c:174
tcp_read_sock+0x20f/0xb10 net/ipv4/tcp.c:1583
rds_tcp_read_sock net/rds/tcp_recv.c:277 [inline]
rds_tcp_data_ready+0x364/0x8b0 net/rds/tcp_recv.c:327
tcp_data_queue+0x20fa/0x76c0 net/ipv4/tcp_input.c:5234
tcp_rcv_established+0xfb7/0x2020 net/ipv4/tcp_input.c:6177
tcp_v6_do_rcv+0xabb/0x13b0 net/ipv6/tcp_ipv6.c:1648
tcp_v6_rcv+0x2555/0x2fc0 net/ipv6/tcp_ipv6.c:1920
ip6_protocol_deliver_rcu+0xc76/0x1570 net/ipv6/ip6_input.c:438
ip6_input_finish+0x186/0x2d0 net/ipv6/ip6_input.c:483
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
NF_HOOK+0x3a4/0x450 include/linux/netfilter.h:314
__netif_receive_skb_one_core net/core/dev.c:5624 [inline]
__netif_receive_skb+0x1ea/0x650 net/core/dev.c:5738
process_backlog+0x391/0x7d0 net/core/dev.c:6067
__napi_poll+0xcb/0x490 net/core/dev.c:6721
napi_poll net/core/dev.c:6790 [inline]
net_rx_action+0x7bb/0x10a0 net/core/dev.c:6906
handle_softirqs+0x2d6/0x990 kernel/softirq.c:554
do_softirq+0x11b/0x1e0 kernel/softirq.c:455
__local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:851 [inline]
__dev_queue_xmit+0x16c9/0x3d30 net/core/dev.c:4420
dev_queue_xmit include/linux/netdevice.h:3095 [inline]
neigh_hh_output include/net/neighbour.h:526 [inline]
neigh_output include/net/neighbour.h:540 [inline]
ip6_finish_output2+0xfc0/0x1670 net/ipv6/ip6_output.c:137
ip6_finish_output+0x41e/0x810 net/ipv6/ip6_output.c:222
NF_HOOK include/linux/netfilter.h:314 [inline]
ip6_xmit+0xefe/0x17f0 net/ipv6/ip6_output.c:358
inet6_csk_xmit+0x466/0x700 net/ipv6/inet6_connection_sock.c:135
__tcp_transmit_skb+0x1eda/0x3b80 net/ipv4/tcp_output.c:1466
tcp_transmit_skb net/ipv4/tcp_output.c:1484 [inline]
tcp_write_xmit+0x18b3/0x69d0 net/ipv4/tcp_output.c:2829
tcp_sendmsg_locked+0x27b0/0x4d70 net/ipv4/tcp.c:1296
tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1348
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xef/0x270 net/socket.c:745
sock_sendmsg+0x134/0x200 net/socket.c:768
splice_to_socket+0xa13/0x10b0 fs/splice.c:889
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11e/0x220 fs/splice.c:1164
splice_direct_to_actor+0x58e/0xc90 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
do_sendfile+0x56d/0xdc0 fs/read_write.c:1295
__do_sys_sendfile64 fs/read_write.c:1362 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (clock-AF_INET6){++--}-{2:2}:
check_prev_add kernel/locking/lockdep.c:3134 [inline]
check_prevs_add kernel/locking/lockdep.c:3253 [inline]
validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
sock_map_del_link net/core/sock_map.c:175 [inline]
sock_map_unref+0x442/0x5e0 net/core/sock_map.c:192
sock_hash_delete_elem+0x392/0x400 net/core/sock_map.c:961
map_delete_elem+0x464/0x5e0 kernel/bpf/syscall.c:1709
__sys_bpf+0x598/0x810 kernel/bpf/syscall.c:5678
__do_sys_bpf kernel/bpf/syscall.c:5794 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5792 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5792
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 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(&htab->buckets[i].lock);
lock(clock-AF_INET6);
lock(&htab->buckets[i].lock);
lock(clock-AF_INET6);
*** DEADLOCK ***
2 locks held by syz-executor.1/8795:
#0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
#0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
#0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: map_delete_elem+0x388/0x5e0 kernel/bpf/syscall.c:1708
#1: ffff8880231b86e0 (&htab->buckets[i].lock){+.-.}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline]
#1: ffff8880231b86e0 (&htab->buckets[i].lock){+.-.}-{2:2}, at: sock_hash_delete_elem+0x17c/0x400 net/core/sock_map.c:957
stack backtrace:
CPU: 1 PID: 8795 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-05151-g1b294a1f3561 #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+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+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
__lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754
__raw_write_lock_bh include/linux/rwlock_api_smp.h:202 [inline]
_raw_write_lock_bh+0x35/0x50 kernel/locking/spinlock.c:334
sock_map_del_link net/core/sock_map.c:175 [inline]
sock_map_unref+0x442/0x5e0 net/core/sock_map.c:192
sock_hash_delete_elem+0x392/0x400 net/core/sock_map.c:961
map_delete_elem+0x464/0x5e0 kernel/bpf/syscall.c:1709
__sys_bpf+0x598/0x810 kernel/bpf/syscall.c:5678
__do_sys_bpf kernel/bpf/syscall.c:5794 [inline]
__se_sys_bpf kernel/bpf/syscall.c:5792 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5792
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f86ad87cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f86ae63e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f86ad9abf80 RCX: 00007f86ad87cee9
RDX: 0000000000000020 RSI: 0000000020000240 RDI: 0000000000000003
RBP: 00007f86ad8c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f86ad9abf80 R15: 00007ffd22bd3f58
</TASK>