------------[ cut here ]------------
WARNING: CPU: 1 PID: 3810 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: 3810 Comm: kworker/1:4 Not tainted 6.11.0-syzkaller #0
Hardware name: ARM-Versatile Express
Workqueue: events nsim_dev_trap_report_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:df805c64 r5:8487e000 r4:00000000
[<80242430>] (warn_slowpath_fmt) from [<8081a110>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:20000113 r9:85256d5c r8:8435bcc0 r7:00000000 r6:817f7394 r5:00000002
 r4:8435bcc0
[<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)
 r9:85256d5c r8:8435bcc0 r7:84864b58 r6:00000df2 r5:85256d00 r4:85256d14
[<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 r8:84864b50 r7:846e3000 r6:846e3008 r5:846e3000
 r4:843a2e40
[<817f7f14>] (j1939_tp_recv) from [<817f1da0>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:846e3000 r6:846e3008 r5:846e3810 r4:843a2e40
[<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 r8:847786a0 r7:98c80000 r6:843a2d80 r5:00000001 r4:85122e70
[<817e7ad0>] (can_rcv_filter) from [<817e8510>] (can_receive+0xb4/0xf0 net/can/af_can.c:663)
 r9:00000040 r8:00000000 r7:84778000 r6:841a8c80 r5:84471a00 r4:843a2d80
[<817e845c>] (can_receive) from [<817e85d0>] (can_rcv+0x84/0xac net/can/af_can.c:687)
 r9:00000040 r8:00000002 r7:00000000 r6:00000000 r5:817e854c r4:843a2d80
[<817e854c>] (can_rcv) from [<814886a4>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5662)
 r5:817e854c r4:84778000
[<81488648>] (__netif_receive_skb_one_core) from [<81488710>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5775)
 r5:ddde4fb0 r4:843a2d80
[<814886f8>] (__netif_receive_skb) from [<81488a00>] (process_backlog+0x88/0x15c net/core/dev.c:6107)
 r5:ddde4fb0 r4:843a2d80
[<81488978>] (process_backlog) from [<81489904>] (__napi_poll+0x34/0x240 net/core/dev.c:6771)
 r10:ddde4ec0 r9:ddde5100 r8:df805ea0 r7:df805e9b 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:df805ea0 r7:0000012c r6:0001183d r5:ddde4fb0 r4:00000000
[<81489e04>] (net_rx_action) from [<8024b5d8>] (handle_softirqs+0x15c/0x468 kernel/softirq.c:554)
 r10:00000008 r9:8487e000 r8:00000101 r7:04208060 r6:00000003 r5:00000004
 r4:8260408c
[<8024b47c>] (handle_softirqs) from [<8024b9d4>] (__do_softirq kernel/softirq.c:588 [inline])
[<8024b47c>] (handle_softirqs) from [<8024b9d4>] (invoke_softirq kernel/softirq.c:428 [inline])
[<8024b47c>] (handle_softirqs) from [<8024b9d4>] (__irq_exit_rcu+0xa4/0x164 kernel/softirq.c:637)
 r10:00000000 r9:8487e000 r8:00000000 r7:e0221d58 r6:821af29c r5:821ef71c
 r4:8487e000
[<8024b930>] (__irq_exit_rcu) from [<8024bcd4>] (irq_exit+0x10/0x18 kernel/softirq.c:661)
 r5:821ef71c r4:824b8b5c
[<8024bcc4>] (irq_exit) from [<81985354>] (generic_handle_arch_irq+0x7c/0x80 kernel/irq/handle.c:240)
[<819852d8>] (generic_handle_arch_irq) from [<81936768>] (call_with_stack+0x1c/0x20 arch/arm/lib/call_with_stack.S:40)
 r9:8487e000 r8:80000013 r7:e0221d8c r6:ffffffff r5:20000013 r4:809c4ce4
[<8193674c>] (call_with_stack) from [<80200bcc>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:227)
Exception stack(0xe0221d58 to 0xe0221da0)
1d40:                                                       00000001 8200e404
1d60: 00000000 00000001 ddde246c 00000006 e0221dd4 841b2000 80000013 82902580
1d80: 00000000 e0221dcc e0221d98 e0221da8 81985f90 809c4ce4 20000013 ffffffff
[<809c4c74>] (crng_make_state) from [<809c4e38>] (_get_random_bytes+0x94/0x124 drivers/char/random.c:398)
 r9:841b2000 r8:00000006 r7:e0221e14 r6:e0221dd4 r5:841b2000 r4:00000006
[<809c4da4>] (_get_random_bytes) from [<809c4ed8>] (get_random_bytes+0x10/0x14 drivers/char/random.c:430)
 r8:00000060 r7:8465ac80 r6:81b8f548 r5:8465a4e0 r4:843a20c0
[<809c4ec8>] (get_random_bytes) from [<80d6ed9c>] (eth_random_addr include/linux/etherdevice.h:238 [inline])
[<809c4ec8>] (get_random_bytes) from [<80d6ed9c>] (nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:755 [inline])
[<809c4ec8>] (get_random_bytes) from [<80d6ed9c>] (nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline])
[<809c4ec8>] (get_random_bytes) from [<80d6ed9c>] (nsim_dev_trap_report_work+0x10c/0x33c drivers/net/netdevsim/dev.c:850)
[<80d6ec90>] (nsim_dev_trap_report_work) from [<80265ef4>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3231)
 r10:82c16205 r9:8487e000 r8:01800000 r7:ddde3f40 r6:82c16200 r5:8465ac80
 r4:85278600
[<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)
 r10:8487e000 r9:8527862c r8:61c88647 r7:ddde3f60 r6:82604d40 r5:ddde3f40
 r4:85278600
[<802668ec>] (worker_thread) from [<8026faf4>] (kthread+0x104/0x134 kernel/kthread.c:389)
 r10:00000000 r9:df95de78 r8:8524d280 r7:85278600 r6:802668ec r5:8487e000
 r4:8527ff80
[<8026f9f0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe0221fb0 to 0xe0221ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8026f9f0 r4:8527ff80
Rebooting in 86400 seconds..