vxcan1: j1939_tp_rxtimer: 0xffff888029af2400: rx timeout, send abort vxcan1: j1939_xtp_rx_abort_one: 0xffff888029af2400: 0x2ff01: (3) A timeout occurred and this is the connection abort to close the session. ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 24 at lib/refcount.c:28 refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28 Modules linked in: CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.12.0-syzkaller-10696-g28866d6e84b8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:refcount_warn_saturate+0x15a/0x1d0 lib/refcount.c:28 Code: a0 13 61 8c e8 a7 85 95 fc 90 0f 0b 90 90 eb 99 e8 8b e0 d4 fc c6 05 8c 6c 47 0b 01 90 48 c7 c7 00 14 61 8c e8 87 85 95 fc 90 <0f> 0b 90 90 e9 76 ff ff ff e8 68 e0 d4 fc c6 05 66 6c 47 0b 01 90 RSP: 0018:ffffc900001e74e0 EFLAGS: 00010246 RAX: faa1740e6bb6d300 RBX: ffff888078929864 RCX: ffff88801d2f8000 RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: ffffffff81568c22 R09: 1ffff110170e519a R10: dffffc0000000000 R11: ffffed10170e519b R12: ffff888029af2468 R13: ffff888078929864 R14: 1ffff1100535e498 R15: ffff888029af2400 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1163afafb8 CR3: 0000000032816000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kfree_skb_reason include/linux/skbuff.h:1263 [inline] kfree_skb include/linux/skbuff.h:1272 [inline] j1939_session_destroy net/can/j1939/transport.c:282 [inline] __j1939_session_release net/can/j1939/transport.c:294 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0x1ed/0x440 net/can/j1939/transport.c:299 j1939_xtp_rx_abort net/can/j1939/transport.c:1362 [inline] j1939_tp_cmd_recv net/can/j1939/transport.c:2128 [inline] j1939_tp_recv+0x92a/0x1050 net/can/j1939/transport.c:2161 j1939_can_recv+0x732/0xb20 net/can/j1939/main.c:108 deliver net/can/af_can.c:573 [inline] can_rcv_filter+0x359/0x7f0 net/can/af_can.c:607 can_receive+0x327/0x480 net/can/af_can.c:664 can_rcv+0x144/0x260 net/can/af_can.c:688 __netif_receive_skb_one_core net/core/dev.c:5672 [inline] __netif_receive_skb+0x2e0/0x650 net/core/dev.c:5785 process_backlog+0x662/0x15b0 net/core/dev.c:6117 __napi_poll+0xcb/0x490 net/core/dev.c:6877 napi_poll net/core/dev.c:6946 [inline] net_rx_action+0x89b/0x1240 net/core/dev.c:7068 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 run_ksoftirqd+0xca/0x130 kernel/softirq.c:943 smpboot_thread_fn+0x544/0xa30 kernel/smpboot.c:164 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244