------------[ cut here ]------------
refcount_t: addition on 0; use-after-free.
WARNING: CPU: 2 PID: 12615 at lib/refcount.c:25 refcount_warn_saturate+0x1ca/0x210 lib/refcount.c:25
Modules linked in:
CPU: 2 UID: 0 PID: 12615 Comm: syz-executor Not tainted 6.15.0-syzkaller-12141-gec7714e49479 #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x1ca/0x210 lib/refcount.c:25
Code: ff 89 de e8 98 4d e0 fc 84 db 0f 85 e6 fe ff ff e8 ab 52 e0 fc c6 05 d6 9e b4 0b 01 90 48 c7 c7 80 1b 15 8c e8 17 1e 9f fc 90 <0f> 0b 90 90 e9 c3 fe ff ff e8 88 52 e0 fc c6 05 b1 9e b4 0b 01 90
RSP: 0018:ffffc900006488b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817ae368
RDX: ffff888029e3a440 RSI: ffffffff817ae375 RDI: 0000000000000001
RBP: ffff88802c6f426c R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88802c6f426c
R13: ffff88802c6f4100 R14: ffff888025c0de00 R15: ffff88803bd29000
FS: 000055558a149500(0000) GS:ffff8880d695a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1bdc9726e0 CR3: 000000003ba8a000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__refcount_add include/linux/refcount.h:289 [inline]
__refcount_inc include/linux/refcount.h:366 [inline]
refcount_inc include/linux/refcount.h:383 [inline]
get_net include/net/net_namespace.h:268 [inline]
tipc_aead_encrypt net/tipc/crypto.c:821 [inline]
tipc_crypto_xmit+0x20c1/0x2550 net/tipc/crypto.c:1761
tipc_bearer_xmit_skb+0x15f/0x430 net/tipc/bearer.c:572
tipc_disc_timeout+0x5b2/0x850 net/tipc/discover.c:338
call_timer_fn+0x19a/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:insert_entry fs/proc/proc_sysctl.c:154 [inline]
RIP: 0010:insert_header+0x3c7/0x1480 fs/proc/proc_sysctl.c:252
Code: 00 e8 ed f6 5b ff 48 89 d8 48 c1 e8 03 80 3c 28 00 0f 85 ae 0c 00 00 48 8b 1b 48 83 c3 08 e8 d0 f6 5b ff 48 89 d8 48 c1 e8 03 <80> 3c 28 00 0f 85 84 0c 00 00 48 8b 03 48 85 c0 0f 84 04 08 00 00
RSP: 0018:ffffc9000691ee40 EFLAGS: 00000a02
RAX: 1ffff11006bff415 RBX: ffff888035ffa0a8 RCX: ffffffff8260203d
RDX: ffff888029e3a440 RSI: ffffffff82601f80 RDI: 0000000000000005
RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffed R11: 0000000000000001 R12: 00000000ffffffed
R13: ffff888035ffa098 R14: 000000000000000d R15: ffffffff8cf35300
__register_sysctl_table+0x70a/0x1900 fs/proc/proc_sysctl.c:1396
__addrconf_sysctl_register+0x1a2/0x360 net/ipv6/addrconf.c:7248
addrconf_sysctl_register net/ipv6/addrconf.c:7296 [inline]
addrconf_sysctl_register+0x15f/0x1f0 net/ipv6/addrconf.c:7285
ipv6_add_dev+0xb39/0x15f0 net/ipv6/addrconf.c:458
addrconf_notify+0x53e/0x19e0 net/ipv6/addrconf.c:3654
notifier_call_chain+0xbc/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2230
call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]
call_netdevice_notifiers net/core/dev.c:2282 [inline]
register_netdevice+0x182e/0x2270 net/core/dev.c:11142
veth_newlink+0x446/0xa00 drivers/net/veth.c:1884
rtnl_newlink_create net/core/rtnetlink.c:3823 [inline]
__rtnl_newlink net/core/rtnetlink.c:3940 [inline]
rtnl_newlink+0xc45/0x2000 net/core/rtnetlink.c:4055
rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6944
netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
__sys_sendto+0x4a3/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xe0/0x1c0 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1349f907bc
Code: 2a 5f 02 00 44 8b 4c 24 2c 4c 8b 44 24 20 89 c5 44 8b 54 24 28 48 8b 54 24 18 b8 2c 00 00 00 48 8b 74 24 10 8b 7c 24 08 0f 05 <48> 3d 00 f0 ff ff 77 34 89 ef 48 89 44 24 08 e8 70 5f 02 00 48 8b
RSP: 002b:00007ffc374220a0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f134ace4620 RCX: 00007f1349f907bc
RDX: 0000000000000064 RSI: 00007f134ace4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc374220f4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f134ace4670 R15: 0000000000000000
----------------
Code disassembly (best guess):
0: 00 e8 add %ch,%al
2: ed in (%dx),%eax
3: f6 5b ff negb -0x1(%rbx)
6: 48 89 d8 mov %rbx,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1)
11: 0f 85 ae 0c 00 00 jne 0xcc5
17: 48 8b 1b mov (%rbx),%rbx
1a: 48 83 c3 08 add $0x8,%rbx
1e: e8 d0 f6 5b ff call 0xff5bf6f3
23: 48 89 d8 mov %rbx,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) <-- trapping instruction
2e: 0f 85 84 0c 00 00 jne 0xcb8
34: 48 8b 03 mov (%rbx),%rax
37: 48 85 c0 test %rax,%rax
3a: 0f 84 04 08 00 00 je 0x844