device geneve0 left promiscuous mode
device vlan2 entered promiscuous mode
device geneve0 entered promiscuous mode
device geneve0 left promiscuous mode
==================================================================
BUG: KASAN: use-after-free in tasklet_action+0x29f/0x340 kernel/softirq.c:506
Read of size 8 at addr ffff8880b0b2ee50 by task ksoftirqd/0/7

CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.14.256-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 tasklet_action+0x29f/0x340 kernel/softirq.c:506
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 invoke_softirq kernel/softirq.c:368 [inline]
 irq_exit+0x193/0x240 kernel/softirq.c:409
 reschedule_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:817
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:200
RSP: 0018:ffff8880b541fcd8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: 1ffffffff11e127b RBX: ffff8880b540a1c0 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff8880b540aa44
RBP: ffff8880ba434380 R08: ffffffff8b9c2a48 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ba434380
R13: ffff888060104100 R14: 0000000000000000 R15: ffff8880ba434cd0
 finish_lock_switch kernel/sched/sched.h:1346 [inline]
 finish_task_switch+0x178/0x610 kernel/sched/core.c:2678
 context_switch kernel/sched/core.c:2814 [inline]
 __schedule+0x893/0x1de0 kernel/sched/core.c:3387
 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3511
 ___preempt_schedule+0x16/0x18
 smpboot_thread_fn+0x777/0x920 kernel/smpboot.c:163
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 10269:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 bcm_tx_setup net/can/bcm.c:960 [inline]
 bcm_sendmsg+0x20bb/0x3ae0 net/can/bcm.c:1396
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

Freed by task 10267:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 bcm_release+0x255/0x900 net/can/bcm.c:1571
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880b0b2ed80
 which belongs to the cache kmalloc-1024 of size 1024
The buggy address is located 208 bytes inside of
 1024-byte region [ffff8880b0b2ed80, ffff8880b0b2f180)
The buggy address belongs to the page:
page:ffffea0002c2cb80 count:1 mapcount:0 mapping:ffff8880b0b2e000 index:0xffff8880b0b2e000 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880b0b2e000 ffff8880b0b2e000 0000000100000004
raw: ffffea000265c1a0 ffff88813fe75838 ffff88813fe74ac0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880b0b2ed00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880b0b2ed80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880b0b2ee00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                 ^
 ffff8880b0b2ee80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880b0b2ef00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================