================================================================== 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 ffff8880a47c5060 by task kworker/0:2/2541 CPU: 0 PID: 2541 Comm: kworker/0:2 Not tainted 5.9.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events free_work Call Trace: __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 __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: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008 Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d fa ca 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 RSP: 0018:ffffc90008c27b00 EFLAGS: 00000286 RAX: 1ffffffff136c781 RBX: ffff88809fb08300 RCX: ffffffff815a18eb RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5fc9e7 R10: fffffbfff18bf93c R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff89c86198 R14: 0000000000000000 R15: ffff88809fb08300 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] free_vmap_area_noflush+0x22/0x370 mm/vmalloc.c:1417 free_unmap_vmap_area mm/vmalloc.c:1441 [inline] remove_vm_area+0x1ca/0x230 mm/vmalloc.c:2174 vm_remove_mappings mm/vmalloc.c:2201 [inline] __vunmap+0x348/0xac0 mm/vmalloc.c:2263 free_work+0x58/0x70 mm/vmalloc.c:69 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 9511: 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 9511: 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 ffff8880a47c5000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 96 bytes inside of 1024-byte region [ffff8880a47c5000, ffff8880a47c5400) The buggy address belongs to the page: page:000000005417862a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa47c5 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002a5cb08 ffffea000259e008 ffff8880aa040700 raw: 0000000000000000 ffff8880a47c5000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a47c4f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a47c4f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880a47c5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a47c5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a47c5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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