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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 ffff88803cc46060 by task syz-fuzzer/6851

CPU: 0 PID: 6851 Comm: syz-fuzzer Not tainted 5.9.0-rc1-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:77 [inline]
 dump_stack+0x18f/0x20d 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+0x5c7/0x1190 kernel/rcu/tree.c:2656
 __do_softirq+0x2de/0xa24 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+0x1f3/0x230 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: 0033:0x41f980
Code: 89 fc 4c 29 cf 48 39 d7 72 a1 48 89 5c 24 78 4c 89 44 24 70 89 44 24 38 89 4c 24 3c 4c 89 24 24 4c 89 4c 24 08 4c 89 5c 24 10 <e8> ab 4e ff ff 48 8b 44 24 18 48 8b 4c 24 20 48 8b 54 24 28 48 85
RSP: 002b:000000c000049ea0 EFLAGS: 00000206
RAX: 0000000000203000 RBX: 00007fa568650722 RCX: 0000000000000001
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000001685c00
RBP: 000000c000049f20 R08: 00007fa568654fff R09: 000000c003f6e400
R10: 000000c00002fe98 R11: 0000000000000048 R12: 000000c0055f4000
R13: 000000000000018e R14: 000000000000018d R15: 0000000000000200

Allocated by task 5429:
 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:750 [inline]
 kvzalloc include/linux/mm.h:758 [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 5429:
 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+0x103/0x2c0 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 ffff88803cc46000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 96 bytes inside of
 4096-byte region [ffff88803cc46000, ffff88803cc47000)
The buggy address belongs to the page:
page:0000000006182497 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3cc46
head:0000000006182497 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea00010eac08 ffffea0001a99c88 ffff8880aa040900
raw: 0000000000000000 ffff88803cc46000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88803cc45f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803cc45f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88803cc46000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff88803cc46080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88803cc46100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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