==================================================================
BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline]
BUG: KASAN: use-after-free in atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline]
BUG: KASAN: use-after-free in refcount_sub_and_test include/linux/refcount.h:266 [inline]
BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:294 [inline]
BUG: KASAN: use-after-free in xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262
Write of size 4 at addr ffff88808fe37860 by task kworker/u4:10/15161

CPU: 0 PID: 15161 Comm: kworker/u4:10 Not tainted 5.9.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 check_memory_region_inline mm/kasan/generic.c:186 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:192
 instrument_atomic_write include/linux/instrumented.h:71 [inline]
 atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline]
 refcount_sub_and_test include/linux/refcount.h:266 [inline]
 refcount_dec_and_test include/linux/refcount.h:294 [inline]
 xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262
 xsk_destruct+0x7d/0xa0 net/xdp/xsk.c:1138
 __sk_destruct+0x4b/0x860 net/core/sock.c:1764
 rcu_do_batch kernel/rcu/tree.c:2428 [inline]
 rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2656
 __do_softirq+0x1f7/0xa91 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x235/0x280 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4b/0x80 kernel/locking/spinlock.c:199
Code: c0 98 3c b6 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d 76 16 be 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 fb 92 57 f9 65 8b 05 44 d8 09 78 85 c0 74 02 5d
RSP: 0018:ffffc90006567950 EFLAGS: 00000282
RAX: 1ffffffff136c793 RBX: ffff8880559be280 RCX: 0000000000000006
RDX: dffffc0000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: ffff8880ae635e40 R08: 0000000000000001 R09: ffffffff8c5ffaa7
R10: fffffbfff18bff54 R11: 0000000000000000 R12: ffff8880ae635e40
R13: ffff888064390340 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3517 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3617
 context_switch kernel/sched/core.c:3781 [inline]
 __schedule+0xeb1/0x2230 kernel/sched/core.c:4527
 preempt_schedule_irq+0xbf/0x1b0 kernel/sched/core.c:4785
 irqentry_exit_cond_resched kernel/entry/common.c:333 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:325 [inline]
 irqentry_exit+0x65/0x90 kernel/entry/common.c:363
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:lock_acquire+0x27b/0xae0 kernel/locking/lockdep.c:5009
Code: ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 04 07 00 00 48 83 3d 38 c8 5b 08 00 0f 84 5a 05 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7
RSP: 0018:ffffc90006567b88 EFLAGS: 00000282
RAX: 1ffffffff136c791 RBX: ffff8880559be280 RCX: 00000000dd5ed671
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffffffff89bd6c80 R08: 0000000000000000 R09: ffffffff8c5ff9e7
R10: fffffbfff18bff3c R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000282
 rcu_lock_acquire include/linux/rcupdate.h:241 [inline]
 rcu_read_lock include/linux/rcupdate.h:634 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:407 [inline]
 batadv_nc_worker+0x12d/0xe50 net/batman-adv/network-coding.c:718
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Allocated by task 15580:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 kmalloc_node include/linux/slab.h:577 [inline]
 kvmalloc_node+0x61/0xf0 mm/util.c:574
 kvmalloc include/linux/mm.h:755 [inline]
 kvzalloc include/linux/mm.h:763 [inline]
 xp_create_and_assign_umem+0x58/0x8d0 net/xdp/xsk_buff_pool.c:54
 xsk_bind+0x9a0/0xed0 net/xdp/xsk.c:709
 __sys_bind+0x1e9/0x250 net/socket.c:1656
 __do_sys_bind net/socket.c:1667 [inline]
 __se_sys_bind net/socket.c:1665 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1665
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 15580:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kfree+0x10e/0x2b0 mm/slab.c:3756
 kvfree+0x42/0x50 mm/util.c:603
 xp_destroy net/xdp/xsk_buff_pool.c:44 [inline]
 xp_destroy+0x45/0x60 net/xdp/xsk_buff_pool.c:38
 xsk_bind+0xbdd/0xed0 net/xdp/xsk.c:719
 __sys_bind+0x1e9/0x250 net/socket.c:1656
 __do_sys_bind net/socket.c:1667 [inline]
 __se_sys_bind net/socket.c:1665 [inline]
 __x64_sys_bind+0x6f/0xb0 net/socket.c:1665
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff88808fe37800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 96 bytes inside of
 1024-byte region [ffff88808fe37800, ffff88808fe37c00)
The buggy address belongs to the page:
page:00000000c1ed7be3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8fe37
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00015a4bc8 ffffea000245dec8 ffff8880aa040700
raw: 0000000000000000 ffff88808fe37000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808fe37700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88808fe37780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88808fe37800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88808fe37880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88808fe37900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================