------------[ cut here ]------------
WARNING: CPU: 0 PID: 26 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: 0 UID: 0 PID: 26 Comm: kworker/u9:0 Not tainted 6.12.0-syzkaller #0
Hardware name: ARM-Versatile Express
Workqueue: events_unbound nsim_dev_trap_report_work
Call trace: frame pointer underflow
[<819b7fb8>] (dump_backtrace) from [<819b80b4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:82623304 r5:00000000 r4:820413b8
[<819b809c>] (show_stack) from [<819d60dc>] (__dump_stack lib/dump_stack.c:94 [inline])
[<819b809c>] (show_stack) from [<819d60dc>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<819d6088>] (dump_stack_lvl) from [<819d611c>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82874d18
[<819d6104>] (dump_stack) from [<819b8be0>] (panic+0x120/0x374 kernel/panic.c:354)
[<819b8ac0>] (panic) from [<802426d0>] (check_panic_on_warn kernel/panic.c:243 [inline])
[<819b8ac0>] (panic) from [<802426d0>] (get_taint+0x0/0x1c kernel/panic.c:238)
 r3:8260c604 r2:00000001 r1:82029878 r0:82031344
 r7:8084bbd8
[<8024265c>] (check_panic_on_warn) from [<80242834>] (__warn+0x80/0x188 kernel/panic.c:748)
[<802427b4>] (__warn) from [<80242b24>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:783)
 r8:00000009 r7:8209017c r6:df801c94 r5:82e44800 r4:00000000
[<80242940>] (warn_slowpath_fmt) from [<8084bbd8>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:20000013 r9:8411685c r8:8417e780 r7:00000000 r6:818444c4 r5:00000002
 r4:8417e780
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (__refcount_sub_and_test include/linux/refcount.h:275 [inline])
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (__refcount_dec_and_test include/linux/refcount.h:307 [inline])
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (refcount_dec_and_test include/linux/refcount.h:325 [inline])
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (skb_unref include/linux/skbuff.h:1233 [inline])
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (__sk_skb_reason_drop net/core/skbuff.c:1213 [inline])
[<8084ba9c>] (refcount_warn_saturate) from [<814aa974>] (sk_skb_reason_drop+0x1d8/0x248 net/core/skbuff.c:1241)
[<814aa79c>] (sk_skb_reason_drop) from [<818444c4>] (kfree_skb_reason include/linux/skbuff.h:1263 [inline])
[<814aa79c>] (sk_skb_reason_drop) from [<818444c4>] (kfree_skb include/linux/skbuff.h:1272 [inline])
[<814aa79c>] (sk_skb_reason_drop) from [<818444c4>] (j1939_session_skb_drop_old net/can/j1939/transport.c:347 [inline])
[<814aa79c>] (sk_skb_reason_drop) from [<818444c4>] (j1939_xtp_rx_cts_one net/can/j1939/transport.c:1445 [inline])
[<814aa79c>] (sk_skb_reason_drop) from [<818444c4>] (j1939_xtp_rx_cts+0x220/0x3d0 net/can/j1939/transport.c:1484)
 r9:8411685c r8:8417e780 r7:84062b58 r6:00000df2 r5:84116800 r4:84116814
[<818442a4>] (j1939_xtp_rx_cts) from [<81845438>] (j1939_tp_cmd_recv net/can/j1939/transport.c:2089 [inline])
[<818442a4>] (j1939_xtp_rx_cts) from [<81845438>] (j1939_tp_recv+0x3f4/0x530 net/can/j1939/transport.c:2161)
 r10:dddd0e88 r9:00000040 r8:84062b50 r7:845cb000 r6:845cb008 r5:845cb000
 r4:844fab40
[<81845044>] (j1939_tp_recv) from [<8183eed0>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:845cb000 r6:845cb008 r5:845cb810 r4:844fab40
[<8183ecec>] (j1939_can_recv) from [<81834b94>] (deliver net/can/af_can.c:573 [inline])
[<8183ecec>] (j1939_can_recv) from [<81834b94>] (can_rcv_filter+0x9c/0x218 net/can/af_can.c:607)
 r9:00000040 r8:843586c0 r7:98c80000 r6:844faa80 r5:00000001 r4:843a7390
[<81834af8>] (can_rcv_filter) from [<81835610>] (can_receive+0xb4/0xf0 net/can/af_can.c:664)
 r9:00000040 r8:00000000 r7:84358000 r6:8417b280 r5:84990000 r4:844faa80
[<8183555c>] (can_receive) from [<818356d0>] (can_rcv+0x84/0xac net/can/af_can.c:688)
 r9:00000040 r8:00000001 r7:00000000 r6:00000000 r5:8183564c r4:844faa80
[<8183564c>] (can_rcv) from [<814cc17c>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5672)
 r5:8183564c r4:84358000
[<814cc120>] (__netif_receive_skb_one_core) from [<814cc1e8>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5785)
 r5:dddd0f70 r4:844faa80
[<814cc1d0>] (__netif_receive_skb) from [<814cc4f0>] (process_backlog+0xa0/0x17c net/core/dev.c:6117)
 r5:dddd0f70 r4:844faa80
[<814cc450>] (process_backlog) from [<814cd3f0>] (__napi_poll+0x34/0x240 net/core/dev.c:6877)
 r10:dddd0e80 r9:dddd10c0 r8:df801ed0 r7:df801ecb r6:00000040 r5:dddd0f70
 r4:00000001
[<814cd3bc>] (__napi_poll) from [<814cdc64>] (napi_poll net/core/dev.c:6946 [inline])
[<814cd3bc>] (__napi_poll) from [<814cdc64>] (net_rx_action+0x358/0x440 net/core/dev.c:7068)
 r9:dddd10c0 r8:df801ed0 r7:0000012c r6:ffffb38f r5:dddd0f70 r4:00000000
[<814cd90c>] (net_rx_action) from [<8024ba68>] (handle_softirqs+0x158/0x464 kernel/softirq.c:554)
 r10:00000008 r9:82e44800 r8:00000102 r7:04208060 r6:00000003 r5:00000004
 r4:8260408c
[<8024b910>] (handle_softirqs) from [<802012d0>] (__do_softirq+0x14/0x18 kernel/softirq.c:588)
 r10:83fb5100 r9:84394280 r8:83fb51fc r7:00000030 r6:81b8fcf8 r5:00000002
 r4:60000013
[<802012bc>] (__do_softirq) from [<80208824>] (____do_softirq+0x10/0x14 arch/arm/kernel/irq.c:77)
[<80208814>] (____do_softirq) from [<8198744c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
[<81987430>] (call_with_stack) from [<80208860>] (do_softirq_own_stack+0x38/0x3c arch/arm/kernel/irq.c:82)
[<80208828>] (do_softirq_own_stack) from [<8024c064>] (do_softirq kernel/softirq.c:455 [inline])
[<80208828>] (do_softirq_own_stack) from [<8024c064>] (do_softirq+0x5c/0x64 kernel/softirq.c:442)
[<8024c008>] (do_softirq) from [<8024c138>] (__local_bh_enable_ip+0xcc/0xd0 kernel/softirq.c:382)
 r5:00000002 r4:82e44800
[<8024c06c>] (__local_bh_enable_ip) from [<819e355c>] (__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline])
[<8024c06c>] (__local_bh_enable_ip) from [<819e355c>] (_raw_spin_unlock_bh+0x34/0x38 kernel/locking/spinlock.c:210)
 r5:84394330 r4:844fa0c0
[<819e3528>] (_raw_spin_unlock_bh) from [<80da91bc>] (spin_unlock_bh include/linux/spinlock.h:396 [inline])
[<819e3528>] (_raw_spin_unlock_bh) from [<80da91bc>] (nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline])
[<819e3528>] (_raw_spin_unlock_bh) from [<80da91bc>] (nsim_dev_trap_report_work+0x2e4/0x410 drivers/net/netdevsim/dev.c:851)
[<80da8ed8>] (nsim_dev_trap_report_work) from [<80266e90>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3229)
 r10:82c1bc05 r9:82e44800 r8:02400000 r7:82c0f600 r6:82c1bc00 r5:84394280
 r4:82cb6580
[<80266cdc>] (process_one_work) from [<80267a74>] (process_scheduled_works kernel/workqueue.c:3310 [inline])
[<80266cdc>] (process_one_work) from [<80267a74>] (worker_thread+0x1ec/0x3bc kernel/workqueue.c:3391)
 r10:82e44800 r9:82cb65ac r8:61c88647 r7:82c0f620 r6:82604d40 r5:82c0f600
 r4:82cb6580
[<80267888>] (worker_thread) from [<80270ae0>] (kthread+0x104/0x134 kernel/kthread.c:389)
 r10:00000000 r9:df819e08 r8:82cd0140 r7:82cb6580 r6:80267888 r5:82e44800
 r4:82cd0040
[<802709dc>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf885fb0 to 0xdf885ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:802709dc r4:82cd0040
Rebooting in 86400 seconds..