------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 7249 at lib/refcount.c:28 refcount_warn_saturate+0x1c8/0x20c lib/refcount.c:28 Modules linked in: CPU: 1 UID: 0 PID: 7249 Comm: syz.0.173 Not tainted 6.12.0-syzkaller-g7b1d1d4cfac0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : refcount_warn_saturate+0x1c8/0x20c lib/refcount.c:28 lr : refcount_warn_saturate+0x1c8/0x20c lib/refcount.c:28 sp : ffff8000800176f0 x29: ffff8000800176f0 x28: dfff800000000000 x27: ffff0000c60f90e4 x26: ffff0000c60f9000 x25: 00000000000006f9 x24: 0000000000000000 x23: ffff0000c60f90e4 x22: ffff80008a6453b8 x21: 0000000000000003 x20: ffff0000c60f90e4 x19: ffff800092b74000 x18: 0000000000000008 x17: 0000000000000000 x16: ffff8000831615b0 x15: 0000000000000001 x14: 1fffe000366c80e2 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000104 x10: 0000000000ff0100 x9 : 98a93f6aa681e200 x8 : 98a93f6aa681e200 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800080016e18 x4 : ffff80008f9bd220 x3 : ffff800080626d8c x2 : 0000000000000001 x1 : 0000000100000102 x0 : 0000000000000000 Call trace: refcount_warn_saturate+0x1c8/0x20c lib/refcount.c:28 (P) refcount_warn_saturate+0x1c8/0x20c lib/refcount.c:28 (L) __refcount_sub_and_test include/linux/refcount.h:275 [inline] __refcount_dec_and_test include/linux/refcount.h:307 [inline] refcount_dec_and_test include/linux/refcount.h:325 [inline] skb_unref include/linux/skbuff.h:1232 [inline] __sk_skb_reason_drop net/core/skbuff.c:1213 [inline] sk_skb_reason_drop+0x210/0x43c net/core/skbuff.c:1241 kfree_skb_reason include/linux/skbuff.h:1262 [inline] kfree_skb include/linux/skbuff.h:1271 [inline] j1939_session_skb_drop_old net/can/j1939/transport.c:347 [inline] j1939_xtp_rx_cts_one net/can/j1939/transport.c:1445 [inline] j1939_xtp_rx_cts+0x464/0xafc net/can/j1939/transport.c:1484 j1939_tp_cmd_recv net/can/j1939/transport.c:2089 [inline] j1939_tp_recv+0x730/0xe14 net/can/j1939/transport.c:2161 j1939_can_recv+0x5bc/0x934 net/can/j1939/main.c:108 deliver net/can/af_can.c:572 [inline] can_rcv_filter+0x308/0x714 net/can/af_can.c:606 can_receive+0x328/0x488 net/can/af_can.c:663 can_rcv+0x128/0x240 net/can/af_can.c:687 __netif_receive_skb_one_core net/core/dev.c:5670 [inline] __netif_receive_skb+0x18c/0x3c8 net/core/dev.c:5783 process_backlog+0x640/0x123c net/core/dev.c:6115 __napi_poll+0xb4/0x3fc net/core/dev.c:6779 napi_poll net/core/dev.c:6848 [inline] net_rx_action+0x6a8/0xf4c net/core/dev.c:6970 handle_softirqs+0x2e0/0xbf8 kernel/softirq.c:554 __do_softirq+0x14/0x20 kernel/softirq.c:588 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:81 call_on_irq_stack+0x24/0x4c arch/arm64/kernel/entry.S:891 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:86 invoke_softirq kernel/softirq.c:435 [inline] __irq_exit_rcu+0x1d8/0x544 kernel/softirq.c:655 irq_exit_rcu+0x14/0x84 kernel/softirq.c:671 __el1_irq arch/arm64/kernel/entry-common.c:561 [inline] el1_interrupt+0x38/0x68 arch/arm64/kernel/entry-common.c:575 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:580 el1h_64_irq+0x6c/0x70 arch/arm64/kernel/entry.S:596 check_preemption_disabled+0x48/0xe4 lib/smp_processor_id.c:55 (P) debug_smp_processor_id+0x20/0x2c lib/smp_processor_id.c:60 (L) rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] rcu_is_watching+0x5c/0x18c kernel/rcu/tree.c:737 trace_contention_begin+0x90/0x2bc include/trace/events/lock.h:95 __mutex_lock_common+0x19c/0x21a0 kernel/locking/mutex.c:610 __mutex_lock kernel/locking/mutex.c:752 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804 __unix_dgram_recvmsg+0x1ec/0xea4 net/unix/af_unix.c:2432 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2537 sock_recvmsg_nosec+0x90/0xec net/socket.c:1051 ____sys_recvmsg+0x58c/0x6e4 net/socket.c:2824 ___sys_recvmsg net/socket.c:2868 [inline] do_recvmmsg+0x3dc/0xb34 net/socket.c:2962 __sys_recvmmsg net/socket.c:3041 [inline] __do_sys_recvmmsg net/socket.c:3064 [inline] __se_sys_recvmmsg net/socket.c:3057 [inline] __arm64_sys_recvmmsg+0x180/0x23c net/socket.c:3057 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 19197 hardirqs last enabled at (19196): [] __up_console_sem kernel/printk/printk.c:344 [inline] hardirqs last enabled at (19196): [] __console_unlock+0x70/0xc4 kernel/printk/printk.c:2844 hardirqs last disabled at (19197): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:488 softirqs last enabled at (16420): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (16420): [] handle_softirqs+0xa38/0xbf8 kernel/softirq.c:582 softirqs last disabled at (19065): [] __do_softirq+0x14/0x20 kernel/softirq.c:588 ---[ end trace 0000000000000000 ]--- vkms_vblank_simulate: vblank timer overrun