[ 20.638215][ T233] ==================================================================
[ 20.638645][ T233] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 20.638976][ T233] Read of size 1 at addr ffff8880050d868c by task packetdrill/233
[ 20.639362][ T233]
[ 20.639500][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.639509][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.639512][ T233] Call Trace:
[ 20.639515][ T233]
[ 20.639518][ T233] dump_stack_lvl+0x82/0xc0
[ 20.639527][ T233] print_address_description.constprop.0+0x2c/0x3a0
[ 20.639536][ T233] ? kobject_put+0xbb/0xd0
[ 20.639542][ T233] print_report+0xb4/0x270
[ 20.639548][ T233] ? kobject_put+0xbb/0xd0
[ 20.639553][ T233] ? kasan_addr_to_slab+0x21/0x70
[ 20.639558][ T233] ? kobject_put+0xbb/0xd0
[ 20.639563][ T233] kasan_report+0xca/0x100
[ 20.639569][ T233] ? kobject_put+0xbb/0xd0
[ 20.639578][ T233] kobject_put+0xbb/0xd0
[ 20.639583][ T233] netdev_run_todo+0x5f0/0xc60
[ 20.639589][ T233] ? rtnl_is_locked+0x15/0x20
[ 20.639595][ T233] ? netif_state_change+0x228/0x2c0
[ 20.639600][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.639605][ T233] ? generic_xdp_install+0x410/0x410
[ 20.639612][ T233] ? tun_chr_close+0xae/0x1c0
[ 20.639623][ T233] tun_chr_close+0xc0/0x1c0
[ 20.639629][ T233] __fput+0x35c/0xa70
[ 20.639641][ T233] fput_close_sync+0xdd/0x1b0
[ 20.639647][ T233] ? alloc_file_clone+0xf0/0xf0
[ 20.639656][ T233] __x64_sys_close+0x7d/0xd0
[ 20.639662][ T233] do_syscall_64+0xc1/0xfd0
[ 20.639671][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.639677][ T233] RIP: 0033:0x4901eb
[ 20.639683][ T233] 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
[ 20.639688][ T233] RSP: 002b:00007ffc7c3dbb10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.639694][ T233] RAX: ffffffffffffffda RBX: 00007ffc7c3dc070 RCX: 00000000004901eb
[ 20.639698][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.639701][ T233] RBP: 00007ffc7c3dbb50 R08: 0000000000000000 R09: 0000000000000000
[ 20.639704][ T233] R10: 00000000213f1170 R11: 0000000000000293 R12: 00007ffc7c3dbfe8
[ 20.639707][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.639720][ T233]
[ 20.639722][ T233]
[ 20.650528][ T233] The buggy address belongs to the physical page:
[ 20.650865][ T233] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880050dd7c0 pfn:0x50d8
[ 20.651418][ T233] flags: 0x80000000000000(node=0|zone=1)
[ 20.651700][ T233] raw: 0080000000000000 ffffea0000243008 ffff88803623bc40 0000000000000000
[ 20.652181][ T233] raw: ffff8880050dd7c0 0000000000000000 00000000ffffffff 0000000000000000
[ 20.652657][ T233] page dumped because: kasan: bad access detected
[ 20.652991][ T233]
[ 20.653137][ T233] Memory state around the buggy address:
[ 20.653386][ T233] ffff8880050d8580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.653763][ T233] ffff8880050d8600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.654147][ T233] >ffff8880050d8680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.654520][ T233] ^
[ 20.654807][ T233] ffff8880050d8700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.655075][ T233] ffff8880050d8780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 20.655357][ T233] ==================================================================
[ 20.656292][ T233] Disabling lock debugging due to kernel taint
[ 20.656530][ T233] ------------[ cut here ]------------
[ 20.656694][ T233] refcount_t: underflow; use-after-free.
[ 20.656877][ T233] WARNING: CPU: 0 PID: 233 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 20.657186][ T233] Modules linked in:
[ 20.657346][ T233] CPU: 0 UID: 0 PID: 233 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 20.657751][ T233] Tainted: [B]=BAD_PAGE
[ 20.657883][ T233] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 20.658102][ T233] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 20.658356][ T233] 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 a5 bc 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
[ 20.658992][ T233] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 20.659230][ T233] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 20.659493][ T233] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 20.659745][ T233] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff7a7e134
[ 20.660006][ T233] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 20.660278][ T233] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 20.660542][ T233] FS: 00000000213ea3c0(0000) GS:ffff888077a1a000(0000) knlGS:0000000000000000
[ 20.660832][ T233] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.661041][ T233] CR2: 00007fac17e0d2d0 CR3: 0000000008ac4004 CR4: 0000000000772ef0
[ 20.661312][ T233] PKRU: 55555554
[ 20.661437][ T233] Call Trace:
[ 20.661562][ T233]
[ 20.661646][ T233] netdev_run_todo+0x5f0/0xc60
[ 20.661816][ T233] ? rtnl_is_locked+0x15/0x20
[ 20.661983][ T233] ? netif_state_change+0x228/0x2c0
[ 20.662156][ T233] ? call_netdevice_notifiers_info+0x100/0x100
[ 20.662372][ T233] ? generic_xdp_install+0x410/0x410
[ 20.662545][ T233] ? tun_chr_close+0xae/0x1c0
[ 20.662713][ T233] tun_chr_close+0xc0/0x1c0
[ 20.662879][ T233] __fput+0x35c/0xa70
[ 20.663007][ T233] fput_close_sync+0xdd/0x1b0
[ 20.663183][ T233] ? alloc_file_clone+0xf0/0xf0
[ 20.663349][ T233] __x64_sys_close+0x7d/0xd0
[ 20.663515][ T233] do_syscall_64+0xc1/0xfd0
[ 20.663683][ T233] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 20.663890][ T233] RIP: 0033:0x4901eb
[ 20.664021][ T233] 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
[ 20.664624][ T233] RSP: 002b:00007ffc7c3dbb10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 20.664888][ T233] RAX: ffffffffffffffda RBX: 00007ffc7c3dc070 RCX: 00000000004901eb
[ 20.665147][ T233] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 20.665404][ T233] RBP: 00007ffc7c3dbb50 R08: 0000000000000000 R09: 0000000000000000
[ 20.665650][ T233] R10: 00000000213f1170 R11: 0000000000000293 R12: 00007ffc7c3dbfe8
[ 20.665893][ T233] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 20.666153][ T233]
[ 20.666286][ T233] irq event stamp: 1827471
[ 20.666452][ T233] hardirqs last enabled at (1827471): [] irqentry_exit+0x3b/0x80
[ 20.666734][ T233] hardirqs last disabled at (1827470): [] handle_softirqs+0x47f/0x610
[ 20.667014][ T233] softirqs last enabled at (1826312): [] handle_softirqs+0x352/0x610
[ 20.667312][ T233] softirqs last disabled at (1826305): [] irq_exit_rcu+0xab/0x100
[ 20.667596][ T233] ---[ end trace 0000000000000000 ]---