BUG: MAX_LOCK_DEPTH too low! turning off the locking correctness validator. depth: 48 max: 48! 48 locks held by syz.3.1806/8432: #0: ffff8880225c0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] #0: ffff8880225c0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: ping_v6_sendmsg+0xb41/0xf50 net/ipv6/ping.c:142 #1: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313 #2: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #3: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #4: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #5: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #6: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #7: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #8: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #9: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #10: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #11: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #12: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #13: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #14: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #15: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #16: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #17: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #18: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #19: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #20: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #21: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #22: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #23: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #24: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #25: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #26: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #27: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #28: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #29: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #30: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #31: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #32: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #33: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #34: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #35: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #36: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #37: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #38: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #39: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #40: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #41: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #42: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #43: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #44: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #45: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #46: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:312 #47: ffffffff8d11efa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313 INFO: lockdep is turned off. CPU: 0 PID: 8432 Comm: syz.3.1806 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 __lock_acquire+0x170f/0x7d40 kernel/locking/lockdep.c:-1 lock_acquire+0x19f/0x400 kernel/locking/lockdep.c:5737 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313 rcu_read_lock include/linux/rcupdate.h:740 [inline] ip6_dst_check+0xe2/0x7a0 net/ipv6/route.c:2748 dst_cache_per_cpu_get+0x1a3/0x310 net/core/dst_cache.c:51 rpl_output+0x165/0x730 net/ipv6/rpl_iptunnel.c:214 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 dst_output include/net/dst.h:452 [inline] rpl_output+0x321/0x730 net/ipv6/rpl_iptunnel.c:250 lwtunnel_output+0x27e/0x440 net/core/lwtunnel.c:342 ip6_send_skb+0x1af/0x350 net/ipv6/ip6_output.c:1886 ping_v6_sendmsg+0xc6f/0xf50 net/ipv6/ping.c:152 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmsg net/socket.c:2529 [inline] __do_sys_sendmsg net/socket.c:2538 [inline] __se_sys_sendmsg+0x1b7/0x2a0 net/socket.c:2536 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7ff579bf6559 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff577e4e028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff579e7dfa0 RCX: 00007ff579bf6559 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007ff579c8d8b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff579e7e038 R14: 00007ff579e7dfa0 R15: 00007ffdd27a0e48 syz.3.1806 (8432) used greatest stack depth: 7440 bytes left