------------[ cut here ]------------
WARNING: CPU: 1 PID: 2969 at lib/refcount.c:28 refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28
refcount_t: underflow; use-after-free.
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 1 UID: 0 PID: 2969 Comm: kworker/u8:2 Not tainted 6.11.0-syzkaller #0
Hardware name: ARM-Versatile Express
Workqueue: ipv6_addrconf addrconf_dad_work
Call trace: frame pointer underflow
[<81966cb8>] (dump_backtrace) from [<81966db4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:826228c4 r5:00000000 r4:8200e404
[<81966d9c>] (show_stack) from [<81984a58>] (__dump_stack lib/dump_stack.c:93 [inline])
[<81966d9c>] (show_stack) from [<81984a58>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:119)
[<81984a04>] (dump_stack_lvl) from [<81984a98>] (dump_stack+0x18/0x1c lib/dump_stack.c:128)
 r5:00000000 r4:8286ed18
[<81984a80>] (dump_stack) from [<8196785c>] (panic+0x120/0x368 kernel/panic.c:354)
[<8196773c>] (panic) from [<802421d4>] (check_panic_on_warn kernel/panic.c:243 [inline])
[<8196773c>] (panic) from [<802421d4>] (get_taint+0x0/0x1c kernel/panic.c:238)
 r3:8260c5c4 r2:00000001 r1:81ff6c38 r0:81ffea04
 r7:8081a110
[<80242160>] (check_panic_on_warn) from [<80242328>] (__warn+0x7c/0x180 kernel/panic.c:741)
[<802422ac>] (__warn) from [<80242614>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:774)
 r8:00000009 r7:8205cdc4 r6:df805c94 r5:84176000 r4:00000000
[<80242430>] (warn_slowpath_fmt) from [<8081a110>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:20000013 r9:858ef45c r8:85199840 r7:00000000 r6:817f7394 r5:00000002
 r4:85199840
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (__refcount_sub_and_test include/linux/refcount.h:275 [inline])
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (__refcount_dec_and_test include/linux/refcount.h:307 [inline])
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (refcount_dec_and_test include/linux/refcount.h:325 [inline])
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (skb_unref include/linux/skbuff.h:1232 [inline])
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (__sk_skb_reason_drop net/core/skbuff.c:1213 [inline])
[<80819fd4>] (refcount_warn_saturate) from [<8146782c>] (sk_skb_reason_drop+0x1d8/0x248 net/core/skbuff.c:1241)
[<81467654>] (sk_skb_reason_drop) from [<817f7394>] (kfree_skb_reason include/linux/skbuff.h:1262 [inline])
[<81467654>] (sk_skb_reason_drop) from [<817f7394>] (kfree_skb include/linux/skbuff.h:1271 [inline])
[<81467654>] (sk_skb_reason_drop) from [<817f7394>] (j1939_session_skb_drop_old net/can/j1939/transport.c:347 [inline])
[<81467654>] (sk_skb_reason_drop) from [<817f7394>] (j1939_xtp_rx_cts_one net/can/j1939/transport.c:1445 [inline])
[<81467654>] (sk_skb_reason_drop) from [<817f7394>] (j1939_xtp_rx_cts+0x220/0x3d0 net/can/j1939/transport.c:1484)
 r9:858ef45c r8:85199840 r7:852e0b58 r6:00000df2 r5:858ef400 r4:858ef414
[<817f7174>] (j1939_xtp_rx_cts) from [<817f8308>] (j1939_tp_cmd_recv net/can/j1939/transport.c:2089 [inline])
[<817f7174>] (j1939_xtp_rx_cts) from [<817f8308>] (j1939_tp_recv+0x3f4/0x530 net/can/j1939/transport.c:2161)
 r10:ddde4ec8 r9:00000040 r8:852e0b50 r7:84d8f000 r6:84d8f008 r5:84d8f000
 r4:858f0540
[<817f7f14>] (j1939_tp_recv) from [<817f1da0>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:84d8f000 r6:84d8f008 r5:84d8f810 r4:858f0540
[<817f1bbc>] (j1939_can_recv) from [<817e7b6c>] (deliver net/can/af_can.c:572 [inline])
[<817f1bbc>] (j1939_can_recv) from [<817e7b6c>] (can_rcv_filter+0x9c/0x218 net/can/af_can.c:606)
 r9:00000040 r8:84538680 r7:98c80000 r6:858f0600 r5:00000001 r4:850ffa20
[<817e7ad0>] (can_rcv_filter) from [<817e8510>] (can_receive+0xb4/0xf0 net/can/af_can.c:663)
 r9:00000040 r8:00000000 r7:84538000 r6:8420da40 r5:84e50000 r4:858f0600
[<817e845c>] (can_receive) from [<817e85d0>] (can_rcv+0x84/0xac net/can/af_can.c:687)
 r9:00000040 r8:00000001 r7:00000000 r6:00000000 r5:817e854c r4:858f0600
[<817e854c>] (can_rcv) from [<814886a4>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5662)
 r5:817e854c r4:84538000
[<81488648>] (__netif_receive_skb_one_core) from [<81488710>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5775)
 r5:ddde4fb0 r4:858f0600
[<814886f8>] (__netif_receive_skb) from [<81488a00>] (process_backlog+0x88/0x15c net/core/dev.c:6107)
 r5:ddde4fb0 r4:858f0600
[<81488978>] (process_backlog) from [<81489904>] (__napi_poll+0x34/0x240 net/core/dev.c:6771)
 r10:ddde4ec0 r9:ddde5100 r8:df805ed0 r7:df805ecb r6:00000040 r5:ddde4fb0
 r4:00000001
[<814898d0>] (__napi_poll) from [<8148a13c>] (napi_poll net/core/dev.c:6840 [inline])
[<814898d0>] (__napi_poll) from [<8148a13c>] (net_rx_action+0x338/0x420 net/core/dev.c:6962)
 r9:ddde5100 r8:df805ed0 r7:0000012c r6:ffffed0b r5:ddde4fb0 r4:00000000
[<81489e04>] (net_rx_action) from [<8024b5d8>] (handle_softirqs+0x15c/0x468 kernel/softirq.c:554)
 r10:00000008 r9:84176000 r8:00000101 r7:04208060 r6:00000003 r5:00000004
 r4:8260408c
[<8024b47c>] (handle_softirqs) from [<802012d0>] (__do_softirq+0x14/0x18 kernel/softirq.c:588)
 r10:81c6df08 r9:00000000 r8:85afd0e0 r7:824b8884 r6:ec169c38 r5:00000001
 r4:60000013
[<802012bc>] (__do_softirq) from [<80208800>] (____do_softirq+0x10/0x14 arch/arm/kernel/irq.c:77)
[<802087f0>] (____do_softirq) from [<81936768>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
[<8193674c>] (call_with_stack) from [<8020883c>] (do_softirq_own_stack+0x38/0x3c arch/arm/kernel/irq.c:82)
[<80208804>] (do_softirq_own_stack) from [<8024baf0>] (do_softirq kernel/softirq.c:455 [inline])
[<80208804>] (do_softirq_own_stack) from [<8024baf0>] (do_softirq+0x5c/0x64 kernel/softirq.c:442)
[<8024ba94>] (do_softirq) from [<8024bbc4>] (__local_bh_enable_ip+0xcc/0xd0 kernel/softirq.c:382)
 r5:00000001 r4:84176000
[<8024baf8>] (__local_bh_enable_ip) from [<8178bc6c>] (local_bh_enable include/linux/bottom_half.h:33 [inline])
[<8024baf8>] (__local_bh_enable_ip) from [<8178bc6c>] (ip6t_do_table+0x494/0x8d0 net/ipv6/netfilter/ip6_tables.c:375)
 r5:00000001 r4:850a4110
[<8178b7d8>] (ip6t_do_table) from [<815988d0>] (nf_hook_entry_hookfn include/linux/netfilter.h:154 [inline])
[<8178b7d8>] (ip6t_do_table) from [<815988d0>] (nf_hook_slow+0x40/0x104 net/netfilter/core.c:626)
 r10:843e2018 r9:8583ae00 r8:ec169d40 r7:858f0e40 r6:8583ae00 r5:00000000
 r4:858f0e40
[<81598890>] (nf_hook_slow) from [<81757d98>] (nf_hook include/linux/netfilter.h:269 [inline])
[<81598890>] (nf_hook_slow) from [<81757d98>] (NF_HOOK include/linux/netfilter.h:312 [inline])
[<81598890>] (nf_hook_slow) from [<81757d98>] (mld_sendpack+0x348/0x500 net/ipv6/mcast.c:1819)
 r9:00000030 r8:83d63c00 r7:85afd000 r6:8581c800 r5:84540d00 r4:858f0e40
[<81757a50>] (mld_sendpack) from [<817590cc>] (mld_send_initial_cr.part.0+0x6c/0x74 net/ipv6/mcast.c:2237)
 r10:83892005 r9:8581c948 r8:858dc240 r7:00000001 r6:00000000 r5:00000001
 r4:00000000
[<81759060>] (mld_send_initial_cr.part.0) from [<8175c298>] (mld_send_initial_cr net/ipv6/mcast.c:2225 [inline])
[<81759060>] (mld_send_initial_cr.part.0) from [<8175c298>] (ipv6_mc_dad_complete+0x50/0xf4 net/ipv6/mcast.c:2245)
 r6:85afd000 r5:8581c930 r4:8581c800
[<8175c248>] (ipv6_mc_dad_complete) from [<8172dd98>] (addrconf_dad_completed+0x36c/0x3d4 net/ipv6/addrconf.c:4342)
 r5:00000001 r4:858dc240
[<8172da2c>] (addrconf_dad_completed) from [<8172e024>] (addrconf_dad_work+0x224/0x570 net/ipv6/addrconf.c:4270)
 r10:83892005 r9:8581c948 r8:858dc240 r7:000000c0 r6:858dc264 r5:858dc288
 r4:858dc260
[<8172de00>] (addrconf_dad_work) from [<80265ef4>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231)
 r10:83892005 r9:84176000 r8:02000000 r7:82c0e600 r6:83892000 r5:858dc288
 r4:84400600
[<80265d40>] (process_one_work) from [<80266ad8>] (process_scheduled_works kernel/workqueue.c:3312 [inline])
[<80265d40>] (process_one_work) from [<80266ad8>] (worker_thread+0x1ec/0x3bc kernel/workqueue.c:3393)
 r10:84176000 r9:8440062c r8:61c88647 r7:82c0e620 r6:82604d40 r5:82c0e600
 r4:84400600
[<802668ec>] (worker_thread) from [<8026faf4>] (kthread+0x104/0x134 kernel/kthread.c:389)
 r10:00000000 r9:e0579e78 r8:843a0a40 r7:84400600 r6:802668ec r5:84176000
 r4:843b6a00
[<8026f9f0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xec169fb0 to 0xec169ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026f9f0 r4:843b6a00
Rebooting in 86400 seconds..