vcan0: j1939_xtp_rx_abort_one: 0x00000000e9ab430e: 0x00000: (3) A timeout occurred and this is the connection abort to close the session. vcan0: j1939_xtp_rx_abort_one: 0x00000000e80b3060: 0x00000: (3) A timeout occurred and this is the connection abort to close the session. ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x96/0x1be0 kernel/locking/lockdep.c:3828 Read of size 8 at addr ffff8880976a5080 by task ksoftirqd/0/9 CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 print_address_description+0x75/0x5c0 mm/kasan/report.c:374 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506 kasan_report+0x26/0x50 mm/kasan/common.c:634 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x96/0x1be0 kernel/locking/lockdep.c:3828 lock_acquire+0x158/0x250 kernel/locking/lockdep.c:4487 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x34/0x50 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:343 [inline] j1939_session_list_lock net/can/j1939/transport.c:238 [inline] j1939_session_get_by_addr net/can/j1939/transport.c:530 [inline] j1939_xtp_rx_abort_one+0x89/0x3f0 net/can/j1939/transport.c:1242 j1939_xtp_rx_abort net/can/j1939/transport.c:1270 [inline] j1939_tp_cmd_recv net/can/j1939/transport.c:1943 [inline] j1939_tp_recv+0x731/0xb80 net/can/j1939/transport.c:1973 j1939_can_recv+0x424/0x650 net/can/j1939/main.c:100 deliver net/can/af_can.c:568 [inline] can_rcv_filter+0x3c0/0x8b0 net/can/af_can.c:602 can_receive+0x2ac/0x3b0 net/can/af_can.c:659 can_rcv+0xe4/0x220 net/can/af_can.c:685 __netif_receive_skb_one_core net/core/dev.c:4929 [inline] __netif_receive_skb+0x136/0x370 net/core/dev.c:5043 process_backlog+0x4d8/0x930 net/core/dev.c:5874 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x5ef/0x10d0 net/core/dev.c:6379 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:766 run_ksoftirqd+0x64/0xf0 kernel/softirq.c:603 smpboot_thread_fn+0x5b3/0x9a0 kernel/smpboot.c:165 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 8161: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:510 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3550 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] j1939_priv_create net/can/j1939/main.c:122 [inline] j1939_netdev_start+0x177/0x730 net/can/j1939/main.c:251 j1939_sk_bind+0x2c0/0xac0 net/can/j1939/socket.c:438 __sys_bind+0x2c2/0x3a0 net/socket.c:1647 __do_sys_bind net/socket.c:1658 [inline] __se_sys_bind net/socket.c:1656 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1656 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x115/0x200 mm/slab.c:3756 __j1939_priv_release net/can/j1939/main.c:154 [inline] kref_put include/linux/kref.h:65 [inline] j1939_priv_put+0x86/0xa0 net/can/j1939/main.c:159 j1939_session_destroy net/can/j1939/transport.c:271 [inline] __j1939_session_release net/can/j1939/transport.c:280 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0xfe/0x150 net/can/j1939/transport.c:285 j1939_xtp_rx_abort_one+0xd3/0x3f0 net/can/j1939/transport.c:1261 j1939_xtp_rx_abort net/can/j1939/transport.c:1269 [inline] j1939_tp_cmd_recv net/can/j1939/transport.c:1943 [inline] j1939_tp_recv+0x719/0xb80 net/can/j1939/transport.c:1973 j1939_can_recv+0x424/0x650 net/can/j1939/main.c:100 deliver net/can/af_can.c:568 [inline] can_rcv_filter+0x3c0/0x8b0 net/can/af_can.c:602 can_receive+0x2ac/0x3b0 net/can/af_can.c:659 can_rcv+0xe4/0x220 net/can/af_can.c:685 __netif_receive_skb_one_core net/core/dev.c:4929 [inline] __netif_receive_skb+0x136/0x370 net/core/dev.c:5043 process_backlog+0x4d8/0x930 net/core/dev.c:5874 napi_poll net/core/dev.c:6311 [inline] net_rx_action+0x5ef/0x10d0 net/core/dev.c:6379 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:766 The buggy address belongs to the object at ffff8880976a4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4224 bytes inside of 8192-byte region [ffff8880976a4000, ffff8880976a6000) The buggy address belongs to the page: page:ffffea00025da900 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00021d8708 ffffea000227a308 ffff8880aa4021c0 raw: 0000000000000000 ffff8880976a4000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880976a4f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880976a5000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880976a5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880976a5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880976a5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================