------------[ cut here ]------------
WARNING: CPU: 0 PID: 11573 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: 11573 Comm: syz.0.1695 Not tainted 6.11.0-syzkaller #0
Hardware name: ARM-Versatile Express
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:df801c64 r5:84fbbc00 r4:00000000
[<80242430>] (warn_slowpath_fmt) from [<8081a110>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:20000113 r9:8508ce5c r8:854fe6c0 r7:00000000 r6:817f7394 r5:00000002
 r4:854fe6c0
[<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)
 r9:8508ce5c r8:854fe6c0 r7:8596c6d8 r6:00000df2 r5:8508ce00 r4:8508ce14
[<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:dddd0ec8 r9:00000040 r8:8596c6d0 r7:8411b000 r6:8411b008 r5:8411b000
 r4:84ccc6c0
[<817f7f14>] (j1939_tp_recv) from [<817f1da0>] (j1939_can_recv+0x1e4/0x2dc net/can/j1939/main.c:108)
 r7:8411b000 r6:8411b008 r5:8411b810 r4:84ccc6c0
[<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 r8:84c4c680 r7:98c80000 r6:84ccc780 r5:00000001 r4:847ac360
[<817e7ad0>] (can_rcv_filter) from [<817e8510>] (can_receive+0xb4/0xf0 net/can/af_can.c:663)
 r9:00000040 r8:00000000 r7:84c4c000 r6:852ab280 r5:84170000 r4:84ccc780
[<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 r4:84ccc780
[<817e854c>] (can_rcv) from [<814886a4>] (__netif_receive_skb_one_core+0x5c/0x80 net/core/dev.c:5662)
 r5:817e854c r4:84c4c000
[<81488648>] (__netif_receive_skb_one_core) from [<81488710>] (__netif_receive_skb+0x18/0x5c net/core/dev.c:5775)
 r5:dddd0fb0 r4:84ccc780
[<814886f8>] (__netif_receive_skb) from [<81488a00>] (process_backlog+0x88/0x15c net/core/dev.c:6107)
 r5:dddd0fb0 r4:84ccc780
[<81488978>] (process_backlog) from [<81489904>] (__napi_poll+0x34/0x240 net/core/dev.c:6771)
 r10:dddd0ec0 r9:dddd1100 r8:df801ea0 r7:df801e9b r6:00000040 r5:dddd0fb0
 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:dddd1100 r8:df801ea0 r7:0000012c r6:0001ef4a r5:dddd0fb0 r4:00000000
[<81489e04>] (net_rx_action) from [<8024b5d8>] (handle_softirqs+0x15c/0x468 kernel/softirq.c:554)
 r10:00000008 r9:84fbbc00 r8:00000101 r7:00400040 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)
 r10:828d2730 r9:84fbbc00 r8:00000000 r7:dfbedda0 r6:821af29c r5:821ef71c
 r4:84fbbc00
[<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)
 r9:84fbbc00 r8:00000000 r7:dfbeddd4 r6:ffffffff r5:80000013 r4:81991bc4
[<8193674c>] (call_with_stack) from [<80200bcc>] (__irq_svc+0x8c/0xbc arch/arm/kernel/entry-armv.S:227)
Exception stack(0xdfbedda0 to 0xdfbedde8)
dda0: 828f0efc 40000013 00000001 00000274 dfbedeb8 828f0efc 40000013 81a03ed8
ddc0: 00000000 00000000 828d2730 dfbeddfc dfbede00 dfbeddf0 808300d4 81991bc4
dde0: 80000013 ffffffff
[<81991b9c>] (_raw_spin_unlock_irqrestore) from [<808300d4>] (__debug_object_init+0xd8/0x1c4 lib/debugobjects.c:646)
[<8082fffc>] (__debug_object_init) from [<80830214>] (debug_object_init_on_stack lib/debugobjects.c:685 [inline])
[<8082fffc>] (__debug_object_init) from [<80830214>] (debug_object_init_on_stack+0x28/0x2c lib/debugobjects.c:680)
 r10:000000f0 r9:00000000 r8:0000c350 r7:002862c4 r6:00000000 r5:00000001
 r4:dfbedeb8
[<808301ec>] (debug_object_init_on_stack) from [<802fbee0>] (hrtimer_init_sleeper_on_stack+0x24/0x4c kernel/time/hrtimer.c:448)
[<802fbebc>] (hrtimer_init_sleeper_on_stack) from [<80318f98>] (futex_setup_timer+0x30/0x5c kernel/futex/core.c:142)
 r7:002862c4 r6:00000000 r5:dfbedeb8 r4:dfbedf60
[<80318f68>] (futex_setup_timer) from [<8031ddf8>] (futex_wait+0x5c/0x108 kernel/futex/waitwake.c:694)
 r5:dfbedf60 r4:00000002
[<8031dd9c>] (futex_wait) from [<8031a0f8>] (do_futex+0xe4/0x1b4 kernel/futex/syscalls.c:102)
 r10:000000f0 r9:84fbbc00 r8:00000000 r7:00000000 r6:002862c4 r5:00000080
 r4:00000000
[<8031a014>] (do_futex) from [<8031a95c>] (__do_sys_futex_time32 kernel/futex/syscalls.c:509 [inline])
[<8031a014>] (do_futex) from [<8031a95c>] (sys_futex_time32+0x90/0x16c kernel/futex/syscalls.c:492)
 r4:7ef96938
[<8031a8cc>] (sys_futex_time32) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfbedfa8 to 0xdfbedff0)
dfa0:                   00000000 00000000 002862c4 00000080 00000000 7ef96938
dfc0: 00000000 00000000 00000000 000000f0 0017eca5 002862c4 00000000 00000000
dfe0: 7ef96838 7ef96828 00024c34 00132da0
 r8:8020029c r7:000000f0 r6:00000000 r5:00000000 r4:00000000
Rebooting in 86400 seconds..