[ 17.472755][ T230] ==================================================================
[ 17.473091][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 17.473302][ T230] Read of size 1 at addr ffff888008a2068c by task packetdrill/230
[ 17.473554][ T230]
[ 17.473639][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.473644][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.473647][ T230] Call Trace:
[ 17.473649][ T230]
[ 17.473652][ T230] dump_stack_lvl+0x82/0xc0
[ 17.473658][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 17.473666][ T230] ? kobject_put+0xbb/0xd0
[ 17.473670][ T230] print_report+0xb4/0x270
[ 17.473674][ T230] ? kobject_put+0xbb/0xd0
[ 17.473677][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 17.473681][ T230] ? kobject_put+0xbb/0xd0
[ 17.473684][ T230] kasan_report+0xca/0x100
[ 17.473688][ T230] ? kobject_put+0xbb/0xd0
[ 17.473693][ T230] kobject_put+0xbb/0xd0
[ 17.473696][ T230] netdev_run_todo+0x5f0/0xc60
[ 17.473702][ T230] ? rtnl_is_locked+0x15/0x20
[ 17.473706][ T230] ? netif_state_change+0x228/0x2c0
[ 17.473710][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 17.473712][ T230] ? generic_xdp_install+0x410/0x410
[ 17.473719][ T230] ? tun_chr_close+0xae/0x1c0
[ 17.473727][ T230] tun_chr_close+0xc0/0x1c0
[ 17.473730][ T230] __fput+0x35c/0xa70
[ 17.473739][ T230] fput_close_sync+0xdd/0x1b0
[ 17.473742][ T230] ? alloc_file_clone+0xf0/0xf0
[ 17.473747][ T230] __x64_sys_close+0x7d/0xd0
[ 17.473751][ T230] do_syscall_64+0xc1/0xfd0
[ 17.473757][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.473761][ T230] RIP: 0033:0x4901eb
[ 17.473767][ T230] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 17.473770][ T230] RSP: 002b:00007ffd3d768410 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 17.473774][ T230] RAX: ffffffffffffffda RBX: 00007ffd3d768970 RCX: 00000000004901eb
[ 17.473776][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 17.473778][ T230] RBP: 00007ffd3d768450 R08: 0000000000000000 R09: 0000000000000000
[ 17.473780][ T230] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffd3d7688e8
[ 17.473782][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 17.473788][ T230]
[ 17.473789][ T230]
[ 17.480358][ T230] The buggy address belongs to the physical page:
[ 17.480554][ T230] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888008a26940 pfn:0x8a20
[ 17.480884][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 17.481062][ T230] raw: 0080000000000000 ffffea00002e8508 ffff8880309bbc40 0000000000000000
[ 17.481368][ T230] raw: ffff888008a26940 0000000000000000 00000000ffffffff 0000000000000000
[ 17.481644][ T230] page dumped because: kasan: bad access detected
[ 17.481842][ T230]
[ 17.481928][ T230] Memory state around the buggy address:
[ 17.482086][ T230] ffff888008a20580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.482318][ T230] ffff888008a20600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.482546][ T230] >ffff888008a20680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.482776][ T230] ^
[ 17.482892][ T230] ffff888008a20700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.483124][ T230] ffff888008a20780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 17.483350][ T230] ==================================================================
[ 17.483612][ T230] Disabling lock debugging due to kernel taint
[ 17.483812][ T230] ------------[ cut here ]------------
[ 17.483981][ T230] refcount_t: underflow; use-after-free.
[ 17.484169][ T230] WARNING: CPU: 3 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 17.484449][ T230] Modules linked in:
[ 17.484576][ T230] CPU: 3 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 17.484945][ T230] Tainted: [B]=BAD_PAGE
[ 17.485070][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 17.485262][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 17.485469][ T230] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d c5 ab e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 17.486023][ T230] RSP: 0018:ffffc90000aa7ce8 EFLAGS: 00010282
[ 17.486217][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 17.486445][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 17.486678][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff58be134
[ 17.486912][ T230] R10: 0000000000000003 R11: ffffc90000aa7880 R12: 0000000000000001
[ 17.487153][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 17.487385][ T230] FS: 000000002167b3c0(0000) GS:ffff888082f9a000(0000) knlGS:0000000000000000
[ 17.487654][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 17.487854][ T230] CR2: 00007fc4c4890000 CR3: 000000000c7c9004 CR4: 0000000000772ef0
[ 17.488109][ T230] PKRU: 55555554
[ 17.488237][ T230] Call Trace:
[ 17.488354][ T230]
[ 17.488436][ T230] netdev_run_todo+0x5f0/0xc60
[ 17.488596][ T230] ? rtnl_is_locked+0x15/0x20
[ 17.488765][ T230] ? netif_state_change+0x228/0x2c0
[ 17.488919][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 17.489115][ T230] ? generic_xdp_install+0x410/0x410
[ 17.489269][ T230] ? tun_chr_close+0xae/0x1c0
[ 17.489423][ T230] tun_chr_close+0xc0/0x1c0
[ 17.489578][ T230] __fput+0x35c/0xa70
[ 17.489699][ T230] fput_close_sync+0xdd/0x1b0
[ 17.489866][ T230] ? alloc_file_clone+0xf0/0xf0
[ 17.490027][ T230] __x64_sys_close+0x7d/0xd0
[ 17.490180][ T230] do_syscall_64+0xc1/0xfd0
[ 17.490338][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 17.490525][ T230] RIP: 0033:0x4901eb
[ 17.490678][ T230] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[ 17.491240][ T230] RSP: 002b:00007ffd3d768410 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 17.491474][ T230] RAX: ffffffffffffffda RBX: 00007ffd3d768970 RCX: 00000000004901eb
[ 17.491705][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 17.491948][ T230] RBP: 00007ffd3d768450 R08: 0000000000000000 R09: 0000000000000000
[ 17.492195][ T230] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffd3d7688e8
[ 17.492426][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 17.492660][ T230]
[ 17.492785][ T230] irq event stamp: 1870353
[ 17.492948][ T230] hardirqs last enabled at (1870353): [] irqentry_exit+0x3b/0x80
[ 17.493222][ T230] hardirqs last disabled at (1870352): [] handle_softirqs+0x47f/0x610
[ 17.493492][ T230] softirqs last enabled at (1870160): [] __tun_set_ebpf+0xc6/0x180
[ 17.493767][ T230] softirqs last disabled at (1870158): [] __tun_set_ebpf+0x91/0x180
[ 17.494045][ T230] ---[ end trace 0000000000000000 ]---