================================================================== BUG: KASAN: use-after-free in register_lock_class+0xd7/0xea0 kernel/locking/lockdep.c:1264 Write of size 8 at addr ffff8880932574e8 by task ksoftirqd/1/16 CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc7 #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_store8_noabort+0x17/0x20 mm/kasan/generic_report.c:137 register_lock_class+0xd7/0xea0 kernel/locking/lockdep.c:1264 __lock_acquire+0x116/0x1be0 kernel/locking/lockdep.c:3837 lock_acquire+0x158/0x250 kernel/locking/lockdep.c:4487 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa1/0xc0 kernel/locking/spinlock.c:159 __wake_up_common_lock kernel/sched/wait.c:122 [inline] __wake_up+0xb8/0x150 kernel/sched/wait.c:142 j1939_sock_pending_del+0x5f/0x70 net/can/j1939/socket.c:74 __j1939_session_drop net/can/j1939/transport.c:257 [inline] j1939_session_destroy net/can/j1939/transport.c:270 [inline] __j1939_session_release net/can/j1939/transport.c:280 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0xd2/0x150 net/can/j1939/transport.c:285 j1939_xtp_rx_eoma+0x491/0x640 net/can/j1939/transport.c:1318 j1939_tp_cmd_recv net/can/j1939/transport.c:1952 [inline] j1939_tp_recv+0x773/0xb80 net/can/j1939/transport.c:1991 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 16263: 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 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x254/0x340 mm/slab.c:3664 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xb0/0x290 net/core/sock.c:1605 sk_alloc+0x38/0x950 net/core/sock.c:1659 can_create+0x1de/0x480 net/can/af_can.c:157 __sock_create+0x5cc/0x910 net/socket.c:1418 sock_create net/socket.c:1469 [inline] __sys_socket+0xe7/0x2e0 net/socket.c:1511 __do_sys_socket net/socket.c:1520 [inline] __se_sys_socket net/socket.c:1518 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1518 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16262: 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 sk_prot_free net/core/sock.c:1642 [inline] __sk_destruct+0x523/0x620 net/core/sock.c:1726 sk_destruct net/core/sock.c:1741 [inline] __sk_free+0x35d/0x430 net/core/sock.c:1752 sk_free+0x2a/0x40 net/core/sock.c:1763 sock_put include/net/sock.h:1730 [inline] j1939_sk_release+0x723/0x810 net/can/j1939/socket.c:588 __sock_release net/socket.c:590 [inline] sock_close+0xe1/0x260 net/socket.c:1268 __fput+0x2e4/0x740 fs/file_table.c:280 ____fput+0x15/0x20 fs/file_table.c:313 task_work_run+0x17e/0x1b0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:163 [inline] prepare_exit_to_usermode+0x459/0x580 arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274 do_syscall_64+0x11f/0x1c0 arch/x86/entry/common.c:300 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff888093257000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1256 bytes inside of 2048-byte region [ffff888093257000, ffff888093257800) The buggy address belongs to the page: page:ffffea00024c95c0 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00019a2e88 ffff8880aa401948 ffff8880aa400e00 raw: 0000000000000000 ffff888093257000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888093257380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093257400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888093257480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888093257500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888093257580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================