------------[ cut here ]------------
WARNING: CPU: 0 PID: 30 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: 30 Comm: kworker/u9:1 Not tainted 6.12.0-rc6-syzkaller #0
Hardware name: ARM-Versatile Express
Workqueue: events_unbound nsim_dev_trap_report_work
Call trace: frame pointer underflow
[<8199c3b8>] (dump_backtrace) from [<8199c4b4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:82622f44 r5:00000000 r4:8203db10
[<8199c49c>] (show_stack) from [<819ba950>] (__dump_stack lib/dump_stack.c:94 [inline])
[<8199c49c>] (show_stack) from [<819ba950>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<819ba8fc>] (dump_stack_lvl) from [<819ba990>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82870d18
[<819ba978>] (dump_stack) from [<8199cfe0>] (panic+0x120/0x374 kernel/panic.c:354)
[<8199cec0>] (panic) from [<80242118>] (check_panic_on_warn kernel/panic.c:243 [inline])
[<8199cec0>] (panic) from [<80242118>] (get_taint+0x0/0x1c kernel/panic.c:238)
 r3:8260c5c4 r2:00000001 r1:82025ee4 r0:8202d94c
 r7:80840660
[<802420a4>] (check_panic_on_warn) from [<8024227c>] (__warn+0x80/0x188 kernel/panic.c:748)
[<802421fc>] (__warn) from [<8024256c>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:783)
 r8:00000009 r7:8208c30c r6:df801c74 r5:82ea1800 r4:00000000
[<80242388>] (warn_slowpath_fmt) from [<80840660>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:dddd10c8 r9:00000040 r8:82e6ab50 r7:00000000 r6:81829a74 r5:00000002
 r4:85092a80
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (__refcount_sub_and_test include/linux/refcount.h:275 [inline])
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (__refcount_dec_and_test include/linux/refcount.h:307 [inline])
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (refcount_dec_and_test include/linux/refcount.h:325 [inline])
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (skb_unref include/linux/skbuff.h:1232 [inline])
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (__sk_skb_reason_drop net/core/skbuff.c:1213 [inline])
[<80840524>] (refcount_warn_saturate) from [<8149b6e8>] (sk_skb_reason_drop+0x1d8/0x248 net/core/skbuff.c:1241)
[<8149b510>] (sk_skb_reason_drop) from [<81829a74>] (kfree_skb_reason include/linux/skbuff.h:1262 [inline])
[<8149b510>] (sk_skb_reason_drop) from [<81829a74>] (kfree_skb include/linux/skbuff.h:1271 [inline])
[<8149b510>] (sk_skb_reason_drop) from [<81829a74>] (j1939_session_destroy+0x78/0x200 net/can/j1939/transport.c:282)
 r9:00000040 r8:82e6ab50 r7:8495481c r6:84778050 r5:84778000 r4:85092a80
[<818299fc>] (j1939_session_destroy) from [<8182abd4>] (__j1939_session_release net/can/j1939/transport.c:294 [inline])
[<818299fc>] (j1939_session_destroy) from [<8182abd4>] (kref_put include/linux/kref.h:65 [inline])
[<818299fc>] (j1939_session_destroy) from [<8182abd4>] (j1939_session_put net/can/j1939/transport.c:299 [inline])
[<818299fc>] (j1939_session_destroy) from [<8182abd4>] (j1939_xtp_rx_eoma+0x120/0x234 net/can/j1939/transport.c:1411)
 r6:85092d80 r5:84778000 r4:84778014
[<8182aab4>] (j1939_xtp_rx_eoma) from [<8182cffc>] (j1939_tp_cmd_recv net/can/j1939/transport.c:2113 [inline])
[<8182aab4>] (j1939_xtp_rx_eoma) from [<8182cffc>] (j1939_tp_recv+0x4a8/0x530 net/can/j1939/transport.c:2161)
 r7:84954000 r6:84954008 r5:84954000 r4:85092d80
[<8182cb54>] (j1939_tp_recv) from [<818269e0>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:84954000 r6:84954008 r5:84954810 r4:85092d80
[<818267fc>] (j1939_can_recv) from [<8181c7b0>] (deliver net/can/af_can.c:572 [inline])
[<818267fc>] (j1939_can_recv) from [<8181c7b0>] (can_rcv_filter+0x9c/0x218 net/can/af_can.c:606)
 r9:00000040 r8:84904680 r7:98ec0000 r6:85092e40 r5:00000001 r4:846af360
[<8181c714>] (can_rcv_filter) from [<8181d154>] (can_receive+0xb4/0xf0 net/can/af_can.c:663)
 r9:00000040 r8:00000000 r7:84904000 r6:849e5300 r5:843a0000 r4:85092e40
[<8181d0a0>] (can_receive) from [<8181d214>] (can_rcv+0x84/0xac net/can/af_can.c:687)
 r9:00000040 r8:00000001 r7:00000000 r6:00000000 r5:8181d190 r4:85092e40
[<8181d190>] (can_rcv) from [<814bc65c>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5670)
 r5:8181d190 r4:84904000
[<814bc600>] (__netif_receive_skb_one_core) from [<814bc6c8>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5783)
 r5:dddd11b0 r4:85092e40
[<814bc6b0>] (__netif_receive_skb) from [<814bc9d0>] (process_backlog+0xa0/0x17c net/core/dev.c:6115)
 r5:dddd11b0 r4:85092e40
[<814bc930>] (process_backlog) from [<814bd8dc>] (__napi_poll+0x34/0x240 net/core/dev.c:6779)
 r10:dddd10c0 r9:dddd1300 r8:df801ed0 r7:df801ecb r6:00000040 r5:dddd11b0
 r4:00000001
[<814bd8a8>] (__napi_poll) from [<814be150>] (napi_poll net/core/dev.c:6848 [inline])
[<814bd8a8>] (__napi_poll) from [<814be150>] (net_rx_action+0x358/0x440 net/core/dev.c:6970)
 r9:dddd1300 r8:df801ed0 r7:0000012c r6:0000130b r5:dddd11b0 r4:00000000
[<814bddf8>] (net_rx_action) from [<8024b55c>] (handle_softirqs+0x158/0x464 kernel/softirq.c:554)
 r10:00000008 r9:82ea1800 r8:00000102 r7:04208160 r6:00000003 r5:00000004
 r4:8260408c
[<8024b404>] (handle_softirqs) from [<802012d0>] (__do_softirq+0x14/0x18 kernel/softirq.c:588)
 r10:84995d00 r9:84995dfc r8:00000040 r7:84692000 r6:81b907d0 r5:00000002
 r4:60000013
[<802012bc>] (__do_softirq) from [<80208800>] (____do_softirq+0x10/0x14 arch/arm/kernel/irq.c:77)
[<802087f0>] (____do_softirq) from [<8196b84c>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
[<8196b830>] (call_with_stack) from [<8020883c>] (do_softirq_own_stack+0x38/0x3c arch/arm/kernel/irq.c:82)
[<80208804>] (do_softirq_own_stack) from [<8024ba74>] (do_softirq kernel/softirq.c:455 [inline])
[<80208804>] (do_softirq_own_stack) from [<8024ba74>] (do_softirq+0x5c/0x64 kernel/softirq.c:442)
[<8024ba18>] (do_softirq) from [<8024bb48>] (__local_bh_enable_ip+0xcc/0xd0 kernel/softirq.c:382)
 r5:00000002 r4:82ea1800
[<8024ba7c>] (__local_bh_enable_ip) from [<819c7ba4>] (__raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline])
[<8024ba7c>] (__local_bh_enable_ip) from [<819c7ba4>] (_raw_spin_unlock_bh+0x34/0x38 kernel/locking/spinlock.c:210)
 r5:846920c0 r4:850929c0
[<819c7b70>] (_raw_spin_unlock_bh) from [<80d9f57c>] (spin_unlock_bh include/linux/spinlock.h:396 [inline])
[<819c7b70>] (_raw_spin_unlock_bh) from [<80d9f57c>] (nsim_dev_trap_report drivers/net/netdevsim/dev.c:820 [inline])
[<819c7b70>] (_raw_spin_unlock_bh) from [<80d9f57c>] (nsim_dev_trap_report_work+0x29c/0x33c drivers/net/netdevsim/dev.c:851)
[<80d9f2e0>] (nsim_dev_trap_report_work) from [<802660dc>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3229)
 r10:82c1bc05 r9:82ea1800 r8:02400000 r7:82c0f600 r6:82c1bc00 r5:84692000
 r4:82e9d000
[<80265f28>] (process_one_work) from [<80266cc0>] (process_scheduled_works kernel/workqueue.c:3310 [inline])
[<80265f28>] (process_one_work) from [<80266cc0>] (worker_thread+0x1ec/0x3bc kernel/workqueue.c:3391)
 r10:82ea1800 r9:82e9d02c r8:61c88647 r7:82c0f620 r6:82604d40 r5:82c0f600
 r4:82e9d000
[<80266ad4>] (worker_thread) from [<8026fd3c>] (kthread+0x104/0x134 kernel/kthread.c:389)
 r10:00000000 r9:df885e78 r8:82ce7300 r7:82e9d000 r6:80266ad4 r5:82ea1800
 r4:82ce7200
[<8026fc38>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf895fb0 to 0xdf895ff8)
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 r5:8026fc38 r4:82ce7200
Rebooting in 86400 seconds..